Release v0.9.2

Bump up go-client to fix auth plugin panic (#281 )
Check correct variable after current namespace retrieval (#287 )
2026-02-22 16:13:30 +00:00 · 2021-02-24 11:21:15 -08:00 · 2021-02-02 15:38:27 -08:00 · 2021-01-31 17:48:35 -08:00 · 2020-12-29 13:40:14 -08:00 · 2020-12-29 13:38:42 -08:00
66 changed files with 4265 additions and 67 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,45 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Go implementation (CI)
+on:
+  push:
+  pull_request:
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Setup Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.15
+    - name: Ensure gofmt
+      run: test -z "$(gofmt -s -d .)"
+    - name: Ensure go.mod is already tidied
+      run: go mod tidy && git diff --no-patch --exit-code
+    - name: Run unit tests
+      run: go test ./...
+    - name: Build with Goreleaser
+      uses: goreleaser/goreleaser-action@v1
+      with:
+        version: latest
+        args: release --snapshot --skip-publish --rm-dist
+    - name: Setup BATS framework
+      run: sudo npm install -g bats
+    - name: kubectx (Go) integration tests
+      run: COMMAND=./dist/kubectx_linux_amd64/kubectx bats test/kubectx.bats
+    - name: kubens (Go) integration tests
+      run: COMMAND=./dist/kubens_linux_amd64/kubens bats test/kubens.bats
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -0,0 +1,44 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Release
+on:
+  push:
+    tags:
+    - 'v*.*.*'
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Setup Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.15
+    - name: GoReleaser
+      uses: goreleaser/goreleaser-action@v1
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - name: Update new version for plugin 'ctx' in krew-index
+      uses: rajatjindal/krew-release-bot@v0.0.38
+      with:
+        krew_template_file: .krew/ctx.yaml
+    - name: Update new version for plugin 'ns' in krew-index
+      uses: rajatjindal/krew-release-bot@v0.0.38
+      with:
+        krew_template_file: .krew/ns.yaml
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -0,0 +1,92 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+before:
+  hooks:
+    - go mod download
+builds:
+- id: kubectx
+  main: ./cmd/kubectx
+  binary: kubectx
+  env:
+  - CGO_ENABLED=0
+  goos:
+    - linux
+    - darwin
+    - windows
+  goarch:
+    - amd64
+    - arm
+    - arm64
+    - ppc64le
+  goarm: [6, 7]
+- id: kubens
+  main: ./cmd/kubens
+  binary: kubens
+  env:
+  - CGO_ENABLED=0
+  goos:
+    - linux
+    - darwin
+    - windows
+  goarch:
+    - amd64
+    - arm
+    - arm64
+    - ppc64le
+  goarm: [6, 7]
+archives:
+- id: kubectx-archive
+  name_template: |-
+    kubectx_{{ .Tag }}_{{ .Os }}_{{ .Arch -}}
+    {{- with .Arm -}}
+      {{- if (eq . "6") -}}hf
+      {{- else -}}v{{- . -}}
+      {{- end -}}
+    {{- end -}}
+  builds:
+    - kubectx
+  replacements:
+    386: i386
+    amd64: x86_64
+  format_overrides:
+    - goos: windows
+      format: zip
+  files: ["LICENSE"]
+- id: kubens-archive
+  name_template: |-
+    kubens_{{ .Tag }}_{{ .Os }}_{{ .Arch -}}
+    {{- with .Arm -}}
+      {{- if (eq . "6") -}}hf
+      {{- else -}}v{{- . -}}
+      {{- end -}}
+    {{- end -}}
+  builds:
+    - kubens
+  replacements:
+    386: i386
+    amd64: x86_64
+  format_overrides:
+    - goos: windows
+      format: zip
+  files: ["LICENSE"]
+checksum:
+  name_template: "checksums.txt"
+  algorithm: sha256
+release:
+  extra_files:
+    - glob: ./kubens
+    - glob: ./kubectx
--- a/.krew/ctx.yaml
+++ b/.krew/ctx.yaml
@@ -0,0 +1,31 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: ctx
+spec:
+  homepage: https://github.com/ahmetb/kubectx
+  shortDescription: Switch between contexts in your kubeconfig
+  version: {{ .TagName }}
+  description: |
+    Also known as "kubectx", a utility to switch between context entries in
+    your kubeconfig file efficiently.
+  caveats: |
+    If fzf is installed on your machine, you can interactively choose
+    between the entries using the arrow keys, or by fuzzy searching
+    as you type.
+    See https://github.com/ahmetb/kubectx for customization and details.
+  platforms:
+  - selector:
+      matchExpressions:
+      - key: os
+        operator: In
+        values:
+        - darwin
+        - linux
+    {{addURIAndSha "https://github.com/ahmetb/kubectx/archive/{{ .TagName }}.tar.gz" .TagName }}
+    bin: kubectx
+    files:
+    - from: kubectx-*/kubectx
+      to: .
+    - from: kubectx-*/LICENSE
+      to: .
--- a/.krew/ns.yaml
+++ b/.krew/ns.yaml
@@ -0,0 +1,30 @@
+apiVersion: krew.googlecontainertools.github.com/v1alpha2
+kind: Plugin
+metadata:
+  name: ns
+spec:
+  homepage: https://github.com/ahmetb/kubectx
+  shortDescription: Switch between Kubernetes namespaces
+  version: {{ .TagName }}
+  description: |
+    Also known as "kubens", a utility to set your current namespace and switch
+    between them.
+  caveats: |
+    If fzf is installed on your machine, you can interactively choose
+    between the entries using the arrow keys, or by fuzzy searching
+    as you type.
+  platforms:
+  - selector:
+      matchExpressions:
+      - key: os
+        operator: In
+        values:
+        - darwin
+        - linux
+    {{addURIAndSha "https://github.com/ahmetb/kubectx/archive/{{ .TagName }}.tar.gz" .TagName }}
+    bin: kubens
+    files:
+    - from: kubectx-*/kubens
+      to: .
+    - from: kubectx-*/LICENSE
+      to: .
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +0,0 @@
-before_install:
-  - sudo add-apt-repository ppa:duggan/bats --yes
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq bats
-  - sudo curl -fsSL -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/v1.13.1/bin/linux/amd64/kubectl
-  - sudo chmod +x /usr/bin/kubectl
-script:
-  - bats test/kubectx.bats
-  - bats test/kubens.bats
-  - shellcheck kubectx
-  - shellcheck kubens
--- a/README.md
+++ b/README.md
@@ -2,12 +2,16 @@

 ![Latest GitHub release](https://img.shields.io/github/release/ahmetb/kubectx.svg)
 ![GitHub stars](https://img.shields.io/github/stars/ahmetb/kubectx.svg?label=github%20stars)
-![Travis (.org) branch](https://img.shields.io/travis/ahmetb/kubectx/master.svg)
+[![Go implementation (CI)](https://github.com/ahmetb/kubectx/workflows/Go%20implementation%20(CI)/badge.svg)](https://github.com/ahmetb/kubectx/actions?query=workflow%3A"Go+implementation+(CI)")
 ![Proudly written in Bash](https://img.shields.io/badge/written%20in-bash-ff69b4.svg)

-
 This repository provides both `kubectx` and `kubens` tools.
+[Install &rarr;](#installation)

+> **🥳📰 NEWS:** With v0.9.0 `kubectx` and `kubens` **are now rewritten in Go**.
+> (Don't worry, our lovely **bash** versions are still available!) Please test
+> this new Go binaries by downloading them from
+> [**Releases &rarr;**](https://github.com/ahmetb/kubectx/releases)

 **`kubectx`** helps you switch between clusters back and forth:
 ![kubectx demo GIF](img/kubectx-demo.gif)
@@ -30,6 +34,7 @@ USAGE:
  kubectx -d <NAME>         : delete context <NAME> ('.' for current-context)
                              (this command won't delete the user/cluster entry
                              that is used by the context)
+  kubectx -u, --unset       : unset the current context
 ```

 ### Usage
@@ -85,6 +90,37 @@ Active namespace is "default".

 ## Installation

+> **🥳📰 NEWS:** With v0.9.0 `kubectx` and `kubens` **are now rewritten in Go**.
+> (Don't worry, our lovely **bash** versions are still available!) Please test
+> this new Go binaries by downloading them from
+> [**Releases &rarr;**](https://github.com/ahmetb/kubectx/releases)
+
+There are several installation options:
+
+- As kubectl plugins (macOS/Linux)
+- macOS
+  - Homebrew (recommended)
+  - MacPorts
+- Linux
+  - Debian
+  - Arch Linux
+  - Homebrew
+  - Manual installation
+
+### Kubectl Plugins (macOS and Linux)
+
+You can install and use [Krew](https://github.com/kubernetes-sigs/krew/) kubectl
+plugin manager to get `kubectx` and `kubens`. **NOTE:** This will not install
+shell completion scripts, if you want those, choose another installation method
+below.
+
+```sh
+kubectl krew install ctx
+kubectl krew install ns
+```
+
+After installing, the tools will be available as `kubectl ctx` and `kubectl ns`.
+
 ### macOS

 #### Homebrew
@@ -106,6 +142,40 @@ If you use [MacPorts](https://www.macports.org) you can install like this:

 ### Linux

+#### Debian
+
+``` bash
+sudo apt install kubectx
+```
+
+Newer versions might be available on repos like
+[Debian Buster (testing)](https://packages.debian.org/buster/kubectx),
+[Sid (unstable)](https://packages.debian.org/sid/kubectx)
+(_if you are unfamiliar with the Debian release process and how to enable
+testing/unstable repos, check out the
+[Debian Wiki](https://wiki.debian.org/DebianReleases)_):
+
+#### Arch Linux
+
+Available as official Arch Linux package. Install it via:
+
+```bash
+sudo pacman -S kubectx
+```
+
+#### Homebrew
+
+:confetti_ball: If you use [Homebrew](https://brew.sh/) you can install like this:
+
+    brew install kubectx
+
+This command will set up bash/zsh/fish completion scripts automatically.
+
+- If you like to add context/namespace info to your shell prompt (`$PS1`),
+  I recommend trying out [kube-ps1](https://github.com/jonmosco/kube-ps1).
+
+#### Manual
+
 Since `kubectx`/`kubens` are written in Bash, you should be able to install
 them to any POSIX environment that has Bash installed.

@@ -115,16 +185,16 @@ them to any POSIX environment that has Bash installed.
  - or save them to a directory, then create symlinks to `kubectx`/`kubens` from
    somewhere in your `PATH`, like `/usr/local/bin`
 - Make `kubectx` and `kubens` executable (`chmod +x ...`)
- Install bash/zsh/fish [completion scripts](completion/).  
-  - For zsh:  
-    The completion scripts have to be in a path that belongs to `$fpath`. Either link or copy them to an existing folder.  
+- Install bash/zsh/fish [completion scripts](completion/).
+  - For zsh:
+    The completion scripts have to be in a path that belongs to `$fpath`. Either link or copy them to an existing folder.
    If using oh-my-zsh you can do as follows:
    ```bash
    mkdir -p ~/.oh-my-zsh/completions
    chmod -R 755 ~/.oh-my-zsh/completions
    ln -s /opt/kubectx/completion/kubectx.zsh ~/.oh-my-zsh/completions/_kubectx.zsh
    ln -s /opt/kubectx/completion/kubens.zsh ~/.oh-my-zsh/completions/_kubens.zsh
-    ```  
+    ```
    Note that the leading underscore seems to be a convention. If completion doesn't work, add `autoload -U compinit && compinit` to your `.zshrc` (similar to [`zsh-completions`](https://github.com/zsh-users/zsh-completions/blob/master/README.md#oh-my-zsh)).
    If not using oh-my-zsh, you could link to `/usr/share/zsh/functions/Completion` (might require sudo), depending on the `$fpath` of your zsh installation.
    In case of error, calling `compaudit` might help.
@@ -135,8 +205,8 @@ them to any POSIX environment that has Bash installed.
    ln -sf ~/.kubectx/completion/kubens.bash $COMPDIR/kubens
    ln -sf ~/.kubectx/completion/kubectx.bash $COMPDIR/kubectx
    cat << FOE >> ~/.bashrc
-    
-    
+
+
    #kubectx and kubens
    export PATH=~/.kubectx:\$PATH
    FOE
@@ -156,22 +226,6 @@ sudo ln -s /opt/kubectx/kubectx /usr/local/bin/kubectx
 sudo ln -s /opt/kubectx/kubens /usr/local/bin/kubens
 ```

-#### Arch Linux
-
-Available as official Arch Linux package. Install it via:
-
-```bash
-sudo pacman -S kubectx
-```
-
-#### Debian/Ubuntu
-
-Available as a Debian package for [Debian Buster (testing)](https://packages.debian.org/buster/kubectx), [Sid (unstable)](https://packages.debian.org/sid/kubectx) (_note: if you are unfamiliar with Debian release process and how to enable testing/unstable repos, check the [Debian Wiki](https://wiki.debian.org/DebianReleases)_):
-
-``` bash
-sudo apt install kubectx
-```
-
 -----

 ### Interactive mode
@@ -184,6 +238,11 @@ with fuzzy searching, you just need to [install

 If you have `fzf` installed, but want to opt out of using this feature, set the environment variable `KUBECTX_IGNORE_FZF=1`.

+If you want to keep `fzf` interactive mode but need the default behavior of the command, you can do it using Unix composability:
+```
+kubectx | cat
+```
+

 -----

--- a/cmd/kubectx/current.go
+++ b/cmd/kubectx/current.go
@@ -0,0 +1,42 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+)
+
+// CurrentOp prints the current context
+type CurrentOp struct{}
+
+func (_op CurrentOp) Run(stdout, _ io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	v := kc.GetCurrentContext()
+	if v == "" {
+		return errors.New("current-context is not set")
+	}
+	_, err := fmt.Fprintln(stdout, v)
+	return errors.Wrap(err, "write error")
+}
--- a/cmd/kubectx/delete.go
+++ b/cmd/kubectx/delete.go
@@ -0,0 +1,76 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// DeleteOp indicates intention to delete contexts.
+type DeleteOp struct {
+	Contexts []string // NAME or '.' to indicate current-context.
+}
+
+// deleteContexts deletes context entries one by one.
+func (op DeleteOp) Run(_, stderr io.Writer) error {
+	for _, ctx := range op.Contexts {
+		// TODO inefficency here. we open/write/close the same file many times.
+		deletedName, wasActiveContext, err := deleteContext(ctx)
+		if err != nil {
+			return errors.Wrapf(err, "error deleting context \"%s\"", deletedName)
+		}
+		if wasActiveContext {
+			printer.Warning(stderr, "You deleted the current context. Use \"%s\" to select a new context.",
+				selfName())
+		}
+
+		printer.Success(stderr, `Deleted context %s.`, printer.SuccessColor.Sprint(deletedName))
+	}
+	return nil
+}
+
+// deleteContext deletes a context entry by NAME or current-context
+// indicated by ".".
+func deleteContext(name string) (deleteName string, wasActiveContext bool, err error) {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return deleteName, false, errors.Wrap(err, "kubeconfig error")
+	}
+
+	cur := kc.GetCurrentContext()
+	// resolve "." to a real name
+	if name == "." {
+		if cur == "" {
+			return deleteName, false, errors.New("can't use '.' as the no active context is set")
+		}
+		wasActiveContext = true
+		name = cur
+	}
+
+	if !kc.ContextExists(name) {
+		return name, false, errors.New("context does not exist")
+	}
+
+	if err := kc.DeleteContextEntry(name); err != nil {
+		return name, false, errors.Wrap(err, "failed to modify yaml doc")
+	}
+	return name, wasActiveContext, errors.Wrap(kc.Save(), "failed to save modified kubeconfig file")
+}
--- a/cmd/kubectx/env.go
+++ b/cmd/kubectx/env.go
@@ -0,0 +1,15 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
--- a/cmd/kubectx/flags.go
+++ b/cmd/kubectx/flags.go
@@ -0,0 +1,72 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+)
+
+// UnsupportedOp indicates an unsupported flag.
+type UnsupportedOp struct{ Err error }
+
+func (op UnsupportedOp) Run(_, _ io.Writer) error {
+	return op.Err
+}
+
+// parseArgs looks at flags (excl. executable name, i.e. argv[0])
+// and decides which operation should be taken.
+func parseArgs(argv []string) Op {
+	if len(argv) == 0 {
+		if cmdutil.IsInteractiveMode(os.Stdout) {
+			return InteractiveSwitchOp{SelfCmd: os.Args[0]}
+		}
+		return ListOp{}
+	}
+
+	if argv[0] == "-d" {
+		if len(argv) == 1 {
+			return UnsupportedOp{Err: fmt.Errorf("'-d' needs arguments")}
+		}
+		return DeleteOp{Contexts: argv[1:]}
+	}
+
+	if len(argv) == 1 {
+		v := argv[0]
+		if v == "--help" || v == "-h" {
+			return HelpOp{}
+		}
+		if v == "--current" || v == "-c" {
+			return CurrentOp{}
+		}
+		if v == "--unset" || v == "-u" {
+			return UnsetOp{}
+		}
+
+		if new, old, ok := parseRenameSyntax(v); ok {
+			return RenameOp{New: new, Old: old}
+		}
+
+		if strings.HasPrefix(v, "-") && v != "-" {
+			return UnsupportedOp{Err: fmt.Errorf("unsupported option '%s'", v)}
+		}
+		return SwitchOp{Target: argv[0]}
+	}
+	return UnsupportedOp{Err: fmt.Errorf("too many arguments")}
+}
--- a/cmd/kubectx/flags_test.go
+++ b/cmd/kubectx/flags_test.go
@@ -0,0 +1,98 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func Test_parseArgs_new(t *testing.T) {
+	tests := []struct {
+		name string
+		args []string
+		want Op
+	}{
+		{name: "nil Args",
+			args: nil,
+			want: ListOp{}},
+		{name: "empty Args",
+			args: []string{},
+			want: ListOp{}},
+		{name: "help shorthand",
+			args: []string{"-h"},
+			want: HelpOp{}},
+		{name: "help long form",
+			args: []string{"--help"},
+			want: HelpOp{}},
+		{name: "current shorthand",
+			args: []string{"-c"},
+			want: CurrentOp{}},
+		{name: "current long form",
+			args: []string{"--current"},
+			want: CurrentOp{}},
+		{name: "unset shorthand",
+			args: []string{"-u"},
+			want: UnsetOp{}},
+		{name: "unset long form",
+			args: []string{"--unset"},
+			want: UnsetOp{}},
+		{name: "switch by name",
+			args: []string{"foo"},
+			want: SwitchOp{Target: "foo"}},
+		{name: "switch by swap",
+			args: []string{"-"},
+			want: SwitchOp{Target: "-"}},
+		{name: "delete - without contexts",
+			args: []string{"-d"},
+			want: UnsupportedOp{fmt.Errorf("'-d' needs arguments")}},
+		{name: "delete - current context",
+			args: []string{"-d", "."},
+			want: DeleteOp{[]string{"."}}},
+		{name: "delete - multiple contexts",
+			args: []string{"-d", ".", "a", "b"},
+			want: DeleteOp{[]string{".", "a", "b"}}},
+		{name: "rename context",
+			args: []string{"a=b"},
+			want: RenameOp{"a", "b"}},
+		{name: "rename context with old=current",
+			args: []string{"a=."},
+			want: RenameOp{"a", "."}},
+		{name: "unrecognized flag",
+			args: []string{"-x"},
+			want: UnsupportedOp{Err: fmt.Errorf("unsupported option '-x'")}},
+		{name: "too many args",
+			args: []string{"a", "b", "c"},
+			want: UnsupportedOp{Err: fmt.Errorf("too many arguments")}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := parseArgs(tt.args)
+
+			var opts cmp.Options
+			if _, ok := tt.want.(UnsupportedOp); ok {
+				opts = append(opts, cmp.Comparer(func(x, y UnsupportedOp) bool {
+					return (x.Err == nil && y.Err == nil) || (x.Err.Error() == y.Err.Error())
+				}))
+			}
+
+			if diff := cmp.Diff(got, tt.want, opts...); diff != "" {
+				t.Errorf("parseArgs(%#v) diff: %s", tt.args, diff)
+			}
+		})
+	}
+}
--- a/cmd/kubectx/fzf.go
+++ b/cmd/kubectx/fzf.go
@@ -0,0 +1,73 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+type InteractiveSwitchOp struct {
+	SelfCmd string
+}
+
+func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
+	// parse kubeconfig just to see if it can be loaded
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	if err := kc.Parse(); err != nil {
+		if cmdutil.IsNotFoundErr(err) {
+			printer.Warning(stderr, "kubeconfig file not found")
+			return nil
+		}
+		return errors.Wrap(err, "kubeconfig error")
+	}
+	kc.Close()
+
+	cmd := exec.Command("fzf", "--ansi", "--no-preview")
+	var out bytes.Buffer
+	cmd.Stdin = os.Stdin
+	cmd.Stderr = stderr
+	cmd.Stdout = &out
+
+	cmd.Env = append(os.Environ(),
+		fmt.Sprintf("FZF_DEFAULT_COMMAND=%s", op.SelfCmd),
+		fmt.Sprintf("%s=1", env.EnvForceColor))
+	if err := cmd.Run(); err != nil {
+		if _, ok := err.(*exec.ExitError); !ok {
+			return err
+		}
+	}
+	choice := strings.TrimSpace(out.String())
+	if choice == "" {
+		return errors.New("you did not choose any of the options")
+	}
+	name, err := switchContext(choice)
+	if err != nil {
+		return errors.Wrap(err, "failed to switch context")
+	}
+	printer.Success(stderr, "Switched to context \"%s\".", printer.SuccessColor.Sprint(name))
+	return nil
+}
--- a/cmd/kubectx/help.go
+++ b/cmd/kubectx/help.go
@@ -0,0 +1,62 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// HelpOp describes printing help.
+type HelpOp struct{}
+
+func (_ HelpOp) Run(stdout, _ io.Writer) error {
+	return printUsage(stdout)
+}
+
+func printUsage(out io.Writer) error {
+	help := `USAGE:
+  %PROG%                       : list the contexts
+  %PROG% <NAME>                : switch to context <NAME>
+  %PROG% -                     : switch to the previous context
+  %PROG% -c, --current         : show the current context name
+  %PROG% <NEW_NAME>=<NAME>     : rename context <NAME> to <NEW_NAME>
+  %PROG% <NEW_NAME>=.          : rename current-context to <NEW_NAME>
+  %PROG% -u, --unset           : unset the current context  
+  %PROG% -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
+  %SPAC%                         (this command won't delete the user/cluster entry
+  %SPAC%                          referenced by the context entry)
+  %PROG% -h,--help             : show this message`
+	help = strings.ReplaceAll(help, "%PROG%", selfName())
+	help = strings.ReplaceAll(help, "%SPAC%", strings.Repeat(" ", len(selfName())))
+
+	_, err := fmt.Fprintf(out, "%s\n", help)
+	return errors.Wrap(err, "write error")
+}
+
+// selfName guesses how the user invoked the program.
+func selfName() string {
+	me := filepath.Base(os.Args[0])
+	pluginPrefix := "kubectl-"
+	if strings.HasPrefix(me, pluginPrefix) {
+		return "kubectl " + strings.TrimPrefix(me, pluginPrefix)
+	}
+	return "kubectx"
+}
--- a/cmd/kubectx/help_test.go
+++ b/cmd/kubectx/help_test.go
@@ -0,0 +1,37 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestPrintHelp(t *testing.T) {
+	var buf bytes.Buffer
+	if err := (&HelpOp{}).Run(&buf, &buf); err != nil {
+		t.Fatal(err)
+	}
+
+	out := buf.String()
+	if !strings.Contains(out, "USAGE:") {
+		t.Errorf("help string doesn't contain USAGE: ; output=\"%s\"", out)
+	}
+
+	if !strings.HasSuffix(out, "\n") {
+		t.Errorf("does not end with New line; output=\"%s\"", out)
+	}
+}
--- a/cmd/kubectx/list.go
+++ b/cmd/kubectx/list.go
@@ -0,0 +1,55 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+
+	"facette.io/natsort"
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// ListOp describes listing contexts.
+type ListOp struct{}
+
+func (_ ListOp) Run(stdout, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		if cmdutil.IsNotFoundErr(err) {
+			printer.Warning(stderr, "kubeconfig file not found")
+			return nil
+		}
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	ctxs := kc.ContextNames()
+	natsort.Sort(ctxs)
+
+	cur := kc.GetCurrentContext()
+	for _, c := range ctxs {
+		s := c
+		if c == cur {
+			s = printer.ActiveItemColor.Sprint(c)
+		}
+		fmt.Fprintf(stdout, "%s\n", s)
+	}
+	return nil
+}
--- a/cmd/kubectx/main.go
+++ b/cmd/kubectx/main.go
@@ -0,0 +1,45 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/printer"
+	"github.com/fatih/color"
+)
+
+type Op interface {
+	Run(stdout, stderr io.Writer) error
+}
+
+func main() {
+	cmdutil.PrintDeprecatedEnvWarnings(color.Error, os.Environ())
+
+	op := parseArgs(os.Args[1:])
+	if err := op.Run(color.Output, color.Error); err != nil {
+		printer.Error(color.Error, err.Error())
+
+		if _, ok := os.LookupEnv(env.EnvDebug); ok {
+			// print stack trace in verbose mode
+			fmt.Fprintf(color.Error, "[DEBUG] error: %+v\n", err)
+		}
+		defer os.Exit(1)
+	}
+}
--- a/cmd/kubectx/rename.go
+++ b/cmd/kubectx/rename.go
@@ -0,0 +1,88 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// RenameOp indicates intention to rename contexts.
+type RenameOp struct {
+	New string // NAME of New context
+	Old string // NAME of Old context (or '.' for current-context)
+}
+
+// parseRenameSyntax parses A=B form into [A,B] and returns
+// whether it is parsed correctly.
+func parseRenameSyntax(v string) (string, string, bool) {
+	s := strings.Split(v, "=")
+	if len(s) != 2 {
+		return "", "", false
+	}
+	new, old := s[0], s[1]
+	if new == "" || old == "" {
+		return "", "", false
+	}
+	return new, old, true
+}
+
+// rename changes the old (NAME or '.' for current-context)
+// to the "new" value. If the old refers to the current-context,
+// current-context preference is also updated.
+func (op RenameOp) Run(_, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	cur := kc.GetCurrentContext()
+	if op.Old == "." {
+		op.Old = cur
+	}
+
+	if !kc.ContextExists(op.Old) {
+		return errors.Errorf("context \"%s\" not found, can't rename it", op.Old)
+	}
+
+	if kc.ContextExists(op.New) {
+		printer.Warning(stderr, "context \"%s\" exists, overwriting it.", op.New)
+		if err := kc.DeleteContextEntry(op.New); err != nil {
+			return errors.Wrap(err, "failed to delete new context to overwrite it")
+		}
+	}
+
+	if err := kc.ModifyContextName(op.Old, op.New); err != nil {
+		return errors.Wrap(err, "failed to change context name")
+	}
+	if op.Old == cur {
+		if err := kc.ModifyCurrentContext(op.New); err != nil {
+			return errors.Wrap(err, "failed to set current-context to new name")
+		}
+	}
+	if err := kc.Save(); err != nil {
+		return errors.Wrap(err, "failed to save modified kubeconfig")
+	}
+	printer.Success(stderr, "Context %s renamed to %s.",
+		printer.SuccessColor.Sprint(op.Old),
+		printer.SuccessColor.Sprint(op.New))
+	return nil
+}
--- a/cmd/kubectx/rename_test.go
+++ b/cmd/kubectx/rename_test.go
@@ -0,0 +1,83 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func Test_parseRenameSyntax(t *testing.T) {
+
+	type out struct {
+		New string
+		Old string
+		OK  bool
+	}
+	tests := []struct {
+		name string
+		in   string
+		want out
+	}{
+		{
+			name: "no equals sign",
+			in:   "foo",
+			want: out{OK: false},
+		},
+		{
+			name: "no left side",
+			in:   "=a",
+			want: out{OK: false},
+		},
+		{
+			name: "no right side",
+			in:   "a=",
+			want: out{OK: false},
+		},
+		{
+			name: "correct format",
+			in:   "a=b",
+			want: out{
+				New: "a",
+				Old: "b",
+				OK:  true,
+			},
+		},
+		{
+			name: "correct format with current context",
+			in:   "NEW_NAME=.",
+			want: out{
+				New: "NEW_NAME",
+				Old: ".",
+				OK:  true,
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			new, old, ok := parseRenameSyntax(tt.in)
+			got := out{
+				New: new,
+				Old: old,
+				OK:  ok,
+			}
+			diff := cmp.Diff(tt.want, got)
+			if diff != "" {
+				t.Errorf("parseRenameSyntax() diff=%s", diff)
+			}
+		})
+	}
+}
--- a/cmd/kubectx/state.go
+++ b/cmd/kubectx/state.go
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+)
+
+func kubectxPrevCtxFile() (string, error) {
+	home := cmdutil.HomeDir()
+	if home == "" {
+		return "", errors.New("HOME or USERPROFILE environment variable not set")
+	}
+	return filepath.Join(home, ".kube", "kubectx"), nil
+}
+
+// readLastContext returns the saved previous context
+// if the state file exists, otherwise returns "".
+func readLastContext(path string) (string, error) {
+	b, err := ioutil.ReadFile(path)
+	if os.IsNotExist(err) {
+		return "", nil
+	}
+	return string(b), err
+}
+
+// writeLastContext saves the specified value to the state file.
+// It creates missing parent directories.
+func writeLastContext(path, value string) error {
+	dir := filepath.Dir(path)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return errors.Wrap(err, "failed to create parent directories")
+	}
+	return ioutil.WriteFile(path, []byte(value), 0644)
+}
--- a/cmd/kubectx/state_test.go
+++ b/cmd/kubectx/state_test.go
@@ -0,0 +1,104 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func Test_readLastContext_nonExistingFile(t *testing.T) {
+	s, err := readLastContext(filepath.FromSlash("/non/existing/file"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s != "" {
+		t.Fatalf("expected empty string; got=\"%s\"", s)
+	}
+}
+
+func Test_readLastContext(t *testing.T) {
+	path, cleanup := testutil.TempFile(t, "foo")
+	defer cleanup()
+
+	s, err := readLastContext(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if expected := "foo"; s != expected {
+		t.Fatalf("expected=\"%s\"; got=\"%s\"", expected, s)
+	}
+}
+
+func Test_writeLastContext_err(t *testing.T) {
+	path := filepath.Join(os.DevNull, "foo", "bar")
+	err := writeLastContext(path, "foo")
+	if err == nil {
+		t.Fatal("got empty error")
+	}
+}
+
+func Test_writeLastContext(t *testing.T) {
+	dir, err := ioutil.TempDir(os.TempDir(), "state-file-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(dir, "foo", "bar")
+
+	if err := writeLastContext(path, "ctx1"); err != nil {
+		t.Fatal(err)
+	}
+
+	v, err := readLastContext(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if expected := "ctx1"; v != expected {
+		t.Fatalf("read wrong value=\"%s\"; expected=\"%s\"", v, expected)
+	}
+}
+
+func Test_kubectxFilePath(t *testing.T) {
+	origHome := os.Getenv("HOME")
+	os.Setenv("HOME", filepath.FromSlash("/foo/bar"))
+	defer os.Setenv("HOME", origHome)
+
+	expected := filepath.Join(filepath.FromSlash("/foo/bar"), ".kube", "kubectx")
+	v, err := kubectxPrevCtxFile()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if v != expected {
+		t.Fatalf("expected=\"%s\" got=\"%s\"", expected, v)
+	}
+}
+
+func Test_kubectxFilePath_error(t *testing.T) {
+	origHome := os.Getenv("HOME")
+	origUserprofile := os.Getenv("USERPROFILE")
+	os.Unsetenv("HOME")
+	os.Unsetenv("USERPROFILE")
+	defer os.Setenv("HOME", origHome)
+	defer os.Setenv("USERPROFILE", origUserprofile)
+
+	_, err := kubectxPrevCtxFile()
+	if err == nil {
+		t.Fatal(err)
+	}
+}
--- a/cmd/kubectx/switch.go
+++ b/cmd/kubectx/switch.go
@@ -0,0 +1,92 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// SwitchOp indicates intention to switch contexts.
+type SwitchOp struct {
+	Target string // '-' for back and forth, or NAME
+}
+
+func (op SwitchOp) Run(_, stderr io.Writer) error {
+	var newCtx string
+	var err error
+	if op.Target == "-" {
+		newCtx, err = swapContext()
+	} else {
+		newCtx, err = switchContext(op.Target)
+	}
+	if err != nil {
+		return errors.Wrap(err, "failed to switch context")
+	}
+	err = printer.Success(stderr, "Switched to context \"%s\".", printer.SuccessColor.Sprint(newCtx))
+	return errors.Wrap(err, "print error")
+}
+
+// switchContext switches to specified context name.
+func switchContext(name string) (string, error) {
+	prevCtxFile, err := kubectxPrevCtxFile()
+	if err != nil {
+		return "", errors.Wrap(err, "failed to determine state file")
+	}
+
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return "", errors.Wrap(err, "kubeconfig error")
+	}
+
+	prev := kc.GetCurrentContext()
+	if !kc.ContextExists(name) {
+		return "", errors.Errorf("no context exists with the name: \"%s\"", name)
+	}
+	if err := kc.ModifyCurrentContext(name); err != nil {
+		return "", err
+	}
+	if err := kc.Save(); err != nil {
+		return "", errors.Wrap(err, "failed to save kubeconfig")
+	}
+
+	if prev != name {
+		if err := writeLastContext(prevCtxFile, prev); err != nil {
+			return "", errors.Wrap(err, "failed to save previous context name")
+		}
+	}
+	return name, nil
+}
+
+// swapContext switches to previously switch context.
+func swapContext() (string, error) {
+	prevCtxFile, err := kubectxPrevCtxFile()
+	if err != nil {
+		return "", errors.Wrap(err, "failed to determine state file")
+	}
+	prev, err := readLastContext(prevCtxFile)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to read previous context file")
+	}
+	if prev == "" {
+		return "", errors.New("no previous context found")
+	}
+	return switchContext(prev)
+}
--- a/cmd/kubectx/unset.go
+++ b/cmd/kubectx/unset.go
@@ -0,0 +1,45 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+// UnsetOp indicates intention to remove current-context preference.
+type UnsetOp struct{}
+
+func (_ UnsetOp) Run(_, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	if err := kc.UnsetCurrentContext(); err != nil {
+		return errors.Wrap(err, "error while modifying current-context")
+	}
+	if err := kc.Save(); err != nil {
+		return errors.Wrap(err, "failed to save kubeconfig file after modification")
+	}
+
+	err := printer.Success(stderr, "Active context unset for kubectl.")
+	return errors.Wrap(err, "write error")
+}
--- a/cmd/kubens/current.go
+++ b/cmd/kubens/current.go
@@ -0,0 +1,45 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+)
+
+type CurrentOp struct{}
+
+func (c CurrentOp) Run(stdout, _ io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	ctx := kc.GetCurrentContext()
+	if ctx == "" {
+		return errors.New("current-context is not set")
+	}
+	ns, err := kc.NamespaceOfContext(ctx)
+	if err != nil {
+		return errors.Wrapf(err, "failed to read namespace of \"%s\"", ctx)
+	}
+	_, err = fmt.Fprintln(stdout, ns)
+	return errors.Wrap(err, "write error")
+}
--- a/cmd/kubens/flags.go
+++ b/cmd/kubens/flags.go
@@ -0,0 +1,57 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+)
+
+// UnsupportedOp indicates an unsupported flag.
+type UnsupportedOp struct{ Err error }
+
+func (op UnsupportedOp) Run(_, _ io.Writer) error {
+	return op.Err
+}
+
+// parseArgs looks at flags (excl. executable name, i.e. argv[0])
+// and decides which operation should be taken.
+func parseArgs(argv []string) Op {
+	if len(argv) == 0 {
+		if cmdutil.IsInteractiveMode(os.Stdout) {
+			return InteractiveSwitchOp{SelfCmd: os.Args[0]}
+		}
+		return ListOp{}
+	}
+
+	if len(argv) == 1 {
+		v := argv[0]
+		if v == "--help" || v == "-h" {
+			return HelpOp{}
+		}
+		if v == "--current" || v == "-c" {
+			return CurrentOp{}
+		}
+		if strings.HasPrefix(v, "-") && v != "-" {
+			return UnsupportedOp{Err: fmt.Errorf("unsupported option '%s'", v)}
+		}
+		return SwitchOp{Target: argv[0]}
+	}
+	return UnsupportedOp{Err: fmt.Errorf("too many arguments")}
+}
--- a/cmd/kubens/flags_test.go
+++ b/cmd/kubens/flags_test.go
@@ -0,0 +1,77 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func Test_parseArgs_new(t *testing.T) {
+	tests := []struct {
+		name string
+		args []string
+		want Op
+	}{
+		{name: "nil Args",
+			args: nil,
+			want: ListOp{}},
+		{name: "empty Args",
+			args: []string{},
+			want: ListOp{}},
+		{name: "help shorthand",
+			args: []string{"-h"},
+			want: HelpOp{}},
+		{name: "help long form",
+			args: []string{"--help"},
+			want: HelpOp{}},
+		{name: "current shorthand",
+			args: []string{"-c"},
+			want: CurrentOp{}},
+		{name: "current long form",
+			args: []string{"--current"},
+			want: CurrentOp{}},
+		{name: "switch by name",
+			args: []string{"foo"},
+			want: SwitchOp{Target: "foo"}},
+		{name: "switch by swap",
+			args: []string{"-"},
+			want: SwitchOp{Target: "-"}},
+		{name: "unrecognized flag",
+			args: []string{"-x"},
+			want: UnsupportedOp{Err: fmt.Errorf("unsupported option '-x'")}},
+		{name: "too many args",
+			args: []string{"a", "b", "c"},
+			want: UnsupportedOp{Err: fmt.Errorf("too many arguments")}},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := parseArgs(tt.args)
+
+			var opts cmp.Options
+			if _, ok := tt.want.(UnsupportedOp); ok {
+				opts = append(opts, cmp.Comparer(func(x, y UnsupportedOp) bool {
+					return (x.Err == nil && y.Err == nil) || (x.Err.Error() == y.Err.Error())
+				}))
+			}
+
+			if diff := cmp.Diff(got, tt.want, opts...); diff != "" {
+				t.Errorf("parseArgs(%#v) diff: %s", tt.args, diff)
+			}
+		})
+	}
+}
--- a/cmd/kubens/fzf.go
+++ b/cmd/kubens/fzf.go
@@ -0,0 +1,74 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+type InteractiveSwitchOp struct {
+	SelfCmd string
+}
+
+// TODO(ahmetb) This method is heavily repetitive vs kubectx/fzf.go.
+func (op InteractiveSwitchOp) Run(_, stderr io.Writer) error {
+	// parse kubeconfig just to see if it can be loaded
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	if err := kc.Parse(); err != nil {
+		if cmdutil.IsNotFoundErr(err) {
+			printer.Warning(stderr, "kubeconfig file not found")
+			return nil
+		}
+		return errors.Wrap(err, "kubeconfig error")
+	}
+	defer kc.Close()
+
+	cmd := exec.Command("fzf", "--ansi", "--no-preview")
+	var out bytes.Buffer
+	cmd.Stdin = os.Stdin
+	cmd.Stderr = stderr
+	cmd.Stdout = &out
+
+	cmd.Env = append(os.Environ(),
+		fmt.Sprintf("FZF_DEFAULT_COMMAND=%s", op.SelfCmd),
+		fmt.Sprintf("%s=1", env.EnvForceColor))
+	if err := cmd.Run(); err != nil {
+		if _, ok := err.(*exec.ExitError); !ok {
+			return err
+		}
+	}
+	choice := strings.TrimSpace(out.String())
+	if choice == "" {
+		return errors.New("you did not choose any of the options")
+	}
+	name, err := switchNamespace(kc, choice)
+	if err != nil {
+		return errors.Wrap(err, "failed to switch namespace")
+	}
+	printer.Success(stderr, "Active namespace is \"%s\".", printer.SuccessColor.Sprint(name))
+	return nil
+}
--- a/cmd/kubens/help.go
+++ b/cmd/kubens/help.go
@@ -0,0 +1,58 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// HelpOp describes printing help.
+type HelpOp struct{}
+
+func (_ HelpOp) Run(stdout, _ io.Writer) error {
+	return printUsage(stdout)
+}
+
+func printUsage(out io.Writer) error {
+	help := `USAGE:
+  %PROG%                    : list the namespaces in the current context
+  %PROG% <NAME>             : change the active namespace of current context
+  %PROG% -                  : switch to the previous namespace in this context
+  %PROG% -c, --current      : show the current namespace
+  %PROG% -h,--help          : show this message
+`
+	// TODO this replace logic is duplicated between this and kubectx
+	help = strings.ReplaceAll(help, "%PROG%", selfName())
+
+	_, err := fmt.Fprintf(out, "%s\n", help)
+	return errors.Wrap(err, "write error")
+}
+
+// selfName guesses how the user invoked the program.
+func selfName() string {
+	// TODO this method is duplicated between this and kubectx
+	me := filepath.Base(os.Args[0])
+	pluginPrefix := "kubectl-"
+	if strings.HasPrefix(me, pluginPrefix) {
+		return "kubectl " + strings.TrimPrefix(me, pluginPrefix)
+	}
+	return "kubens"
+}
--- a/cmd/kubens/list.go
+++ b/cmd/kubens/list.go
@@ -0,0 +1,109 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/pkg/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	_ "k8s.io/client-go/plugin/pkg/client/auth"
+	"k8s.io/client-go/tools/clientcmd"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+type ListOp struct{}
+
+func (op ListOp) Run(stdout, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	ctx := kc.GetCurrentContext()
+	if ctx == "" {
+		return errors.New("current-context is not set")
+	}
+	curNs, err := kc.NamespaceOfContext(ctx)
+	if err != nil {
+		return errors.Wrap(err, "cannot read current namespace")
+	}
+
+	ns, err := queryNamespaces(kc)
+	if err != nil {
+		return errors.Wrap(err, "could not list namespaces (is the cluster accessible?)")
+	}
+
+	for _, c := range ns {
+		s := c
+		if c == curNs {
+			s = printer.ActiveItemColor.Sprint(c)
+		}
+		fmt.Fprintf(stdout, "%s\n", s)
+	}
+	return nil
+}
+
+func queryNamespaces(kc *kubeconfig.Kubeconfig) ([]string, error) {
+	if os.Getenv("_MOCK_NAMESPACES") != "" {
+		return []string{"ns1", "ns2"}, nil
+	}
+
+	clientset, err := newKubernetesClientSet(kc)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to initialize k8s REST client")
+	}
+
+	var out []string
+	var next string
+	for {
+		list, err := clientset.CoreV1().Namespaces().List(
+			context.Background(),
+			metav1.ListOptions{
+				Limit:    500,
+				Continue: next,
+			})
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to list namespaces from k8s API")
+		}
+		next = list.Continue
+		for _, it := range list.Items {
+			out = append(out, it.Name)
+		}
+		if next == "" {
+			break
+		}
+	}
+	return out, nil
+}
+
+func newKubernetesClientSet(kc *kubeconfig.Kubeconfig) (*kubernetes.Clientset, error) {
+	b, err := kc.Bytes()
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to convert in-memory kubeconfig to yaml")
+	}
+	cfg, err := clientcmd.RESTConfigFromKubeConfig(b)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to initialize config")
+	}
+	return kubernetes.NewForConfig(cfg)
+}
--- a/cmd/kubens/main.go
+++ b/cmd/kubens/main.go
@@ -0,0 +1,44 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"github.com/ahmetb/kubectx/internal/env"
+	"github.com/ahmetb/kubectx/internal/printer"
+	"github.com/fatih/color"
+)
+
+type Op interface {
+	Run(stdout, stderr io.Writer) error
+}
+
+func main() {
+	cmdutil.PrintDeprecatedEnvWarnings(color.Error, os.Environ())
+	op := parseArgs(os.Args[1:])
+	if err := op.Run(color.Output, color.Error); err != nil {
+		printer.Error(color.Error, err.Error())
+
+		if _, ok := os.LookupEnv(env.EnvDebug); ok {
+			// print stack trace in verbose mode
+			fmt.Fprintf(color.Error, "[DEBUG] error: %+v\n", err)
+		}
+		defer os.Exit(1)
+	}
+}
--- a/cmd/kubens/statefile.go
+++ b/cmd/kubens/statefile.go
@@ -0,0 +1,73 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+)
+
+var defaultDir = filepath.Join(cmdutil.HomeDir(), ".kube", "kubens")
+
+type NSFile struct {
+	dir string
+	ctx string
+}
+
+func NewNSFile(ctx string) NSFile { return NSFile{dir: defaultDir, ctx: ctx} }
+
+func (f NSFile) path() string {
+	fn := f.ctx
+	if isWindows() {
+		// bug 230: eks clusters contain ':' in ctx name, not a valid file name for win32
+		fn = strings.ReplaceAll(fn, ":", "__")
+	}
+	return filepath.Join(f.dir, fn)
+}
+
+// Load reads the previous namespace setting, or returns empty if not exists.
+func (f NSFile) Load() (string, error) {
+	b, err := ioutil.ReadFile(f.path())
+	if err != nil {
+		if os.IsNotExist(err) {
+			return "", nil
+		}
+		return "", err
+	}
+	return string(bytes.TrimSpace(b)), nil
+}
+
+// Save stores the previous namespace information in the file.
+func (f NSFile) Save(value string) error {
+	d := filepath.Dir(f.path())
+	if err := os.MkdirAll(d, 0755); err != nil {
+		return err
+	}
+	return ioutil.WriteFile(f.path(), []byte(value), 0644)
+}
+
+// isWindows determines if the process is running on windows OS.
+func isWindows() bool {
+	if os.Getenv("_FORCE_GOOS") == "windows" { // for testing
+		return true
+	}
+	return runtime.GOOS == "windows"
+}
--- a/cmd/kubens/statefile_test.go
+++ b/cmd/kubens/statefile_test.go
@@ -0,0 +1,81 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestNSFile(t *testing.T) {
+	td, err := ioutil.TempDir(os.TempDir(), "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(td)
+
+	f := NewNSFile("foo")
+	f.dir = td
+	v, err := f.Load()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if v != "" {
+		t.Fatalf("Load() expected empty; got=%v", err)
+	}
+
+	err = f.Save("bar")
+	if err != nil {
+		t.Fatalf("Save() err=%v", err)
+	}
+
+	v, err = f.Load()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if expected := "bar"; v != expected {
+		t.Fatalf("Load()=\"%s\"; expected=\"%s\"", v, expected)
+	}
+}
+
+func TestNSFile_path_windows(t *testing.T) {
+	defer testutil.WithEnvVar("_FORCE_GOOS", "windows")()
+	fp := NewNSFile("a:b:c").path()
+
+	if expected := "a__b__c"; !strings.HasSuffix(fp, expected) {
+		t.Fatalf("file did not have expected ending %q: %s", expected, fp)
+	}
+}
+
+func Test_isWindows(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("won't test this case on windows")
+	}
+
+	got := isWindows()
+	if got {
+		t.Fatalf("isWindows() returned true for %s", runtime.GOOS)
+	}
+
+	defer testutil.WithEnvVar("_FORCE_GOOS", "windows")()
+	if !isWindows() {
+		t.Fatalf("isWindows() failed to detect windows with env override.")
+	}
+}
--- a/cmd/kubens/switch.go
+++ b/cmd/kubens/switch.go
@@ -0,0 +1,111 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"io"
+	"os"
+
+	"github.com/pkg/errors"
+	errors2 "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+type SwitchOp struct {
+	Target string // '-' for back and forth, or NAME
+}
+
+func (s SwitchOp) Run(_, stderr io.Writer) error {
+	kc := new(kubeconfig.Kubeconfig).WithLoader(kubeconfig.DefaultLoader)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		return errors.Wrap(err, "kubeconfig error")
+	}
+
+	toNS, err := switchNamespace(kc, s.Target)
+	if err != nil {
+		return err
+	}
+	err = printer.Success(stderr, "Active namespace is \"%s\"", printer.SuccessColor.Sprint(toNS))
+	return err
+}
+
+func switchNamespace(kc *kubeconfig.Kubeconfig, ns string) (string, error) {
+	ctx := kc.GetCurrentContext()
+	if ctx == "" {
+		return "", errors.New("current-context is not set")
+	}
+	curNS, err := kc.NamespaceOfContext(ctx)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to get current namespace")
+	}
+
+	f := NewNSFile(ctx)
+	prev, err := f.Load()
+	if err != nil {
+		return "", errors.Wrap(err, "failed to load previous namespace from file")
+	}
+
+	if ns == "-" {
+		if prev == "" {
+			return "", errors.Errorf("No previous namespace found for current context (%s)", ctx)
+		}
+		ns = prev
+	}
+
+	ok, err := namespaceExists(kc, ns)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to query if namespace exists (is cluster accessible?)")
+	}
+	if !ok {
+		return "", errors.Errorf("no namespace exists with name \"%s\"", ns)
+	}
+
+	if err := kc.SetNamespace(ctx, ns); err != nil {
+		return "", errors.Wrapf(err, "failed to change to namespace \"%s\"", ns)
+	}
+	if err := kc.Save(); err != nil {
+		return "", errors.Wrap(err, "failed to save kubeconfig file")
+	}
+	if curNS != ns {
+		if err := f.Save(curNS); err != nil {
+			return "", errors.Wrap(err, "failed to save the previous namespace to file")
+		}
+	}
+	return ns, nil
+}
+
+func namespaceExists(kc *kubeconfig.Kubeconfig, ns string) (bool, error) {
+	// for tests
+	if os.Getenv("_MOCK_NAMESPACES") != "" {
+		return ns == "ns1" || ns == "ns2", nil
+	}
+
+	clientset, err := newKubernetesClientSet(kc)
+	if err != nil {
+		return false, errors.Wrap(err, "failed to initialize k8s REST client")
+	}
+
+	namespace, err := clientset.CoreV1().Namespaces().Get(context.Background(), ns, metav1.GetOptions{})
+	if errors2.IsNotFound(err) {
+		return false, nil
+	}
+	return namespace != nil, errors.Wrapf(err, "failed to query "+
+		"namespace %q from k8s API", ns)
+}
--- a/completion/kubectx.fish
+++ b/completion/kubectx.fish
@@ -1,3 +1,10 @@
 # kubectx
-complete -f -c kubectx -a "- (kubectl config get-contexts --output='name')"

+function __fish_kubectx_arg_number -a number
+    set -l cmd (commandline -opc)
+    test (count $cmd) -eq $number
+end
+
+complete -f -c kubectx
+complete -f -x -c kubectx -n '__fish_kubectx_arg_number 1' -a "(kubectl config get-contexts --output='name')"
+complete -f -x -c kubectx -n '__fish_kubectx_arg_number 1' -a "-" -d "switch to the previous namespace in this context"
--- a/completion/kubens.fish
+++ b/completion/kubens.fish
@@ -1,3 +1,12 @@
 # kubens
-complete -f -c kubens -a "(kubectl get ns -o=custom-columns=NAME:.metadata.name --no-headers)"

+function __fish_kubens_arg_number -a number
+    set -l cmd (commandline -opc)
+    test (count $cmd) -eq $number
+end
+
+complete -f -c kubens
+complete -f -x -c kubens -n '__fish_kubens_arg_number 1' -a "(kubectl get ns -o=custom-columns=NAME:.metadata.name --no-headers)"
+complete -f -x -c kubens -n '__fish_kubens_arg_number 1' -a "-" -d "switch to the previous namespace in this context"
+complete -f -x -c kubens -n '__fish_kubens_arg_number 1' -s c -l current -d "show the current namespace"
+complete -f -x -c kubens -n '__fish_kubens_arg_number 1' -s h -l help -d "show the help message"
--- a/go.mod
+++ b/go.mod
@@ -0,0 +1,15 @@
+module github.com/ahmetb/kubectx
+
+go 1.14
+
+require (
+	facette.io/natsort v0.0.0-20181210072756-2cd4dd1e2dcb
+	github.com/fatih/color v1.9.0
+	github.com/google/go-cmp v0.5.2
+	github.com/imdario/mergo v0.3.9 // indirect
+	github.com/mattn/go-isatty v0.0.12
+	github.com/pkg/errors v0.9.1
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c
+	k8s.io/apimachinery v0.21.0-alpha.1
+	k8s.io/client-go v0.21.0-alpha.1
+)
--- a/go.sum
+++ b/go.sum
@@ -0,0 +1,452 @@
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+sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
--- a/internal/cmdutil/deprecated.go
+++ b/internal/cmdutil/deprecated.go
@@ -0,0 +1,36 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmdutil
+
+import (
+	"io"
+	"strings"
+
+	"github.com/ahmetb/kubectx/internal/printer"
+)
+
+func PrintDeprecatedEnvWarnings(out io.Writer, vars []string) {
+	for _, vv := range vars {
+		parts := strings.SplitN(vv, "=", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		key := parts[0]
+
+		if key == `KUBECTX_CURRENT_FGCOLOR` || key == `KUBECTX_CURRENT_BGCOLOR` {
+			printer.Warning(out, "%s environment variable is now deprecated", key)
+		}
+	}
+}
--- a/internal/cmdutil/deprecated_test.go
+++ b/internal/cmdutil/deprecated_test.go
@@ -0,0 +1,48 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmdutil
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestPrintDeprecatedEnvWarnings_noDeprecatedVars(t *testing.T) {
+	var out bytes.Buffer
+	PrintDeprecatedEnvWarnings(&out, []string{
+		"A=B",
+		"PATH=/foo:/bar:/bin",
+	})
+	if v := out.String(); len(v) > 0 {
+		t.Fatalf("something written to buf: %v", v)
+	}
+}
+
+func TestPrintDeprecatedEnvWarnings_bgColors(t *testing.T) {
+	var out bytes.Buffer
+
+	PrintDeprecatedEnvWarnings(&out, []string{
+		"KUBECTX_CURRENT_FGCOLOR=1",
+		"KUBECTX_CURRENT_BGCOLOR=2",
+	})
+	v := out.String()
+	if !strings.Contains(v, "KUBECTX_CURRENT_FGCOLOR") {
+		t.Fatalf("output doesn't contain 'KUBECTX_CURRENT_FGCOLOR': \"%s\"", v)
+	}
+	if !strings.Contains(v, "KUBECTX_CURRENT_BGCOLOR") {
+		t.Fatalf("output doesn't contain 'KUBECTX_CURRENT_BGCOLOR': \"%s\"", v)
+	}
+}
--- a/internal/cmdutil/interactive.go
+++ b/internal/cmdutil/interactive.go
@@ -0,0 +1,44 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmdutil
+
+import (
+	"os"
+	"os/exec"
+
+	"github.com/mattn/go-isatty"
+
+	"github.com/ahmetb/kubectx/internal/env"
+)
+
+// isTerminal determines if given fd is a TTY.
+func isTerminal(fd *os.File) bool {
+	return isatty.IsTerminal(fd.Fd())
+}
+
+// fzfInstalled determines if fzf(1) is in PATH.
+func fzfInstalled() bool {
+	v, _ := exec.LookPath("fzf")
+	if v != "" {
+		return true
+	}
+	return false
+}
+
+// IsInteractiveMode determines if we can do choosing with fzf.
+func IsInteractiveMode(stdout *os.File) bool {
+	v := os.Getenv(env.EnvFZFIgnore)
+	return v == "" && isTerminal(stdout) && fzfInstalled()
+}
--- a/internal/cmdutil/util.go
+++ b/internal/cmdutil/util.go
@@ -0,0 +1,43 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmdutil
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+func HomeDir() string {
+	if v := os.Getenv("XDG_CACHE_HOME"); v != "" {
+		return v
+	}
+	home := os.Getenv("HOME")
+	if home == "" {
+		home = os.Getenv("USERPROFILE") // windows
+	}
+	return home
+}
+
+// IsNotFoundErr determines if the underlying error is os.IsNotExist. Right now
+// errors from github.com/pkg/errors doesn't work with os.IsNotExist.
+func IsNotFoundErr(err error) bool {
+	for e := err; e != nil; e = errors.Unwrap(e) {
+		if os.IsNotExist(e) {
+			return true
+		}
+	}
+	return false
+}
--- a/internal/cmdutil/util_test.go
+++ b/internal/cmdutil/util_test.go
@@ -0,0 +1,82 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmdutil
+
+import (
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func Test_homeDir(t *testing.T) {
+	type env struct{ k, v string }
+	cases := []struct {
+		name string
+		envs []env
+		want string
+	}{
+		{
+			name: "XDG_CACHE_HOME precedence",
+			envs: []env{
+				{"XDG_CACHE_HOME", "xdg"},
+				{"HOME", "home"},
+			},
+			want: "xdg",
+		},
+		{
+			name: "HOME over USERPROFILE",
+			envs: []env{
+				{"HOME", "home"},
+				{"USERPROFILE", "up"},
+			},
+			want: "home",
+		},
+		{
+			name: "only USERPROFILE available",
+			envs: []env{
+				{"XDG_CACHE_HOME", ""},
+				{"HOME", ""},
+				{"USERPROFILE", "up"},
+			},
+			want: "up",
+		},
+		{
+			name: "none available",
+			envs: []env{
+				{"XDG_CACHE_HOME", ""},
+				{"HOME", ""},
+				{"USERPROFILE", ""},
+			},
+			want: "",
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(tt *testing.T) {
+			var unsets []func()
+			for _, e := range c.envs {
+				unsets = append(unsets, testutil.WithEnvVar(e.k, e.v))
+			}
+
+			got := HomeDir()
+			if got != c.want {
+				t.Errorf("expected:%q got:%q", c.want, got)
+			}
+			for _, u := range unsets {
+				u()
+			}
+		})
+	}
+}
--- a/internal/env/constants.go
+++ b/internal/env/constants.go
@@ -0,0 +1,32 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package env
+
+const (
+	// EnvFZFIgnore describes the environment variable to set to disable
+	// interactive context selection when fzf is installed.
+	EnvFZFIgnore = "KUBECTX_IGNORE_FZF"
+
+	// EnvForceColor describes the environment variable to disable color usage
+	// when printing current context in a list.
+	EnvNoColor = `NO_COLOR`
+
+	// EnvForceColor describes the "internal" environment variable to force
+	// color usage to show current context in a list.
+	EnvForceColor = `_KUBECTX_FORCE_COLOR`
+
+	// EnvDebug describes the internal environment variable for more verbose logging.
+	EnvDebug = `DEBUG`
+)
--- a/internal/kubeconfig/contextmodify.go
+++ b/internal/kubeconfig/contextmodify.go
@@ -0,0 +1,83 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
+)
+
+func (k *Kubeconfig) DeleteContextEntry(deleteName string) error {
+	contexts, err := k.contextsNode()
+	if err != nil {
+		return err
+	}
+
+	i := -1
+	for j, ctxNode := range contexts.Content {
+		nameNode := valueOf(ctxNode, "name")
+		if nameNode != nil && nameNode.Kind == yaml.ScalarNode && nameNode.Value == deleteName {
+			i = j
+			break
+		}
+	}
+	if i >= 0 {
+		copy(contexts.Content[i:], contexts.Content[i+1:])
+		contexts.Content[len(contexts.Content)-1] = nil
+		contexts.Content = contexts.Content[:len(contexts.Content)-1]
+	}
+	return nil
+}
+
+func (k *Kubeconfig) ModifyCurrentContext(name string) error {
+	currentCtxNode := valueOf(k.rootNode, "current-context")
+	if currentCtxNode != nil {
+		currentCtxNode.Value = name
+		return nil
+	}
+
+	// if current-context field doesn't exist, create new field
+	keyNode := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: "current-context",
+		Tag:   "!!str"}
+	valueNode := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: name,
+		Tag:   "!!str"}
+	k.rootNode.Content = append(k.rootNode.Content, keyNode, valueNode)
+	return nil
+}
+
+func (k *Kubeconfig) ModifyContextName(old, new string) error {
+	contexts, err := k.contextsNode()
+	if err != nil {
+		return err
+	}
+
+	var changed bool
+	for _, contextNode := range contexts.Content {
+		nameNode := valueOf(contextNode, "name")
+		if nameNode.Kind == yaml.ScalarNode && nameNode.Value == old {
+			nameNode.Value = new
+			changed = true
+			break
+		}
+	}
+	if !changed {
+		return errors.New("no changes were made")
+	}
+	return nil
+}
--- a/internal/kubeconfig/contextmodify_test.go
+++ b/internal/kubeconfig/contextmodify_test.go
@@ -0,0 +1,180 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestKubeconfig_DeleteContextEntry_errors(t *testing.T) {
+	kc := new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`[1, 2, 3]`))
+	_ = kc.Parse()
+	err := kc.DeleteContextEntry("foo")
+	if err == nil {
+		t.Fatal("supposed to fail on non-mapping nodes")
+	}
+
+	kc = new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`a: b`))
+	_ = kc.Parse()
+	err = kc.DeleteContextEntry("foo")
+	if err == nil {
+		t.Fatal("supposed to fail if contexts key does not exist")
+	}
+
+	kc = new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`contexts: "some string"`))
+	_ = kc.Parse()
+	err = kc.DeleteContextEntry("foo")
+	if err == nil {
+		t.Fatal("supposed to fail if contexts key is not an array")
+	}
+}
+
+func TestKubeconfig_DeleteContextEntry(t *testing.T) {
+	test := WithMockKubeconfigLoader(
+		testutil.KC().WithCtxs(
+			testutil.Ctx("c1"),
+			testutil.Ctx("c2"),
+			testutil.Ctx("c3")).ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.DeleteContextEntry("c1"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	expected := testutil.KC().WithCtxs(
+		testutil.Ctx("c2"),
+		testutil.Ctx("c3")).ToYAML(t)
+	out := test.Output()
+	if diff := cmp.Diff(expected, out); diff != "" {
+		t.Fatalf("diff: %s", diff)
+	}
+}
+
+func TestKubeconfig_ModifyCurrentContext_fieldExists(t *testing.T) {
+	test := WithMockKubeconfigLoader(
+		testutil.KC().WithCurrentCtx("abc").Set("field1", "value1").ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyCurrentContext("foo"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	expected := testutil.KC().WithCurrentCtx("foo").Set("field1", "value1").ToYAML(t)
+	out := test.Output()
+	if diff := cmp.Diff(expected, out); diff != "" {
+		t.Fatalf("diff: %s", diff)
+	}
+}
+
+func TestKubeconfig_ModifyCurrentContext_fieldMissing(t *testing.T) {
+	test := WithMockKubeconfigLoader(`f1: v1`)
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyCurrentContext("foo"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	expected := `f1: v1
+current-context: foo
+`
+	out := test.Output()
+	if diff := cmp.Diff(expected, out); diff != "" {
+		t.Fatalf("diff: %s", diff)
+	}
+}
+
+func TestKubeconfig_ModifyContextName_noContextsEntryError(t *testing.T) {
+	// no context entries
+	test := WithMockKubeconfigLoader(`a: b`)
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyContextName("c1", "c2"); err == nil {
+		t.Fatal("was expecting error for no 'contexts' entry; got nil")
+	}
+}
+
+func TestKubeconfig_ModifyContextName_contextsEntryNotSequenceError(t *testing.T) {
+	// no context entries
+	test := WithMockKubeconfigLoader(
+		`contexts: "hello"`)
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyContextName("c1", "c2"); err == nil {
+		t.Fatal("was expecting error for 'context entry not a sequence'; got nil")
+	}
+}
+
+func TestKubeconfig_ModifyContextName_noChange(t *testing.T) {
+	test := WithMockKubeconfigLoader(testutil.KC().WithCtxs(
+		testutil.Ctx("c1"),
+		testutil.Ctx("c2"),
+		testutil.Ctx("c3")).ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyContextName("c5", "c6"); err == nil {
+		t.Fatal("was expecting error for 'no changes made'")
+	}
+}
+
+func TestKubeconfig_ModifyContextName(t *testing.T) {
+	test := WithMockKubeconfigLoader(testutil.KC().WithCtxs(
+		testutil.Ctx("c1"),
+		testutil.Ctx("c2"),
+		testutil.Ctx("c3")).ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(test)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyContextName("c1", "ccc"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	expected := testutil.KC().WithCtxs(
+		testutil.Ctx("ccc"),
+		testutil.Ctx("c2"),
+		testutil.Ctx("c3")).ToYAML(t)
+	out := test.Output()
+	if diff := cmp.Diff(expected, out); diff != "" {
+		t.Fatalf("diff: %s", diff)
+	}
+}
--- a/internal/kubeconfig/contexts.go
+++ b/internal/kubeconfig/contexts.go
@@ -0,0 +1,86 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
+)
+
+func (k *Kubeconfig) contextsNode() (*yaml.Node, error) {
+	contexts := valueOf(k.rootNode, "contexts")
+	if contexts == nil {
+		return nil, errors.New("\"contexts\" entry is nil")
+	} else if contexts.Kind != yaml.SequenceNode {
+		return nil, errors.New("\"contexts\" is not a sequence node")
+	}
+	return contexts, nil
+}
+
+func (k *Kubeconfig) contextNode(name string) (*yaml.Node, error) {
+	contexts, err := k.contextsNode()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, contextNode := range contexts.Content {
+		nameNode := valueOf(contextNode, "name")
+		if nameNode.Kind == yaml.ScalarNode && nameNode.Value == name {
+			return contextNode, nil
+		}
+	}
+	return nil, errors.Errorf("context with name \"%s\" not found", name)
+}
+
+func (k *Kubeconfig) ContextNames() []string {
+	contexts := valueOf(k.rootNode, "contexts")
+	if contexts == nil {
+		return nil
+	}
+	if contexts.Kind != yaml.SequenceNode {
+		return nil
+	}
+
+	var ctxNames []string
+	for _, ctx := range contexts.Content {
+		nameVal := valueOf(ctx, "name")
+		if nameVal != nil {
+			ctxNames = append(ctxNames, nameVal.Value)
+		}
+	}
+	return ctxNames
+}
+
+func (k *Kubeconfig) ContextExists(name string) bool {
+	ctxNames := k.ContextNames()
+	for _, v := range ctxNames {
+		if v == name {
+			return true
+		}
+	}
+	return false
+}
+
+func valueOf(mapNode *yaml.Node, key string) *yaml.Node {
+	if mapNode.Kind != yaml.MappingNode {
+		return nil
+	}
+	for i, ch := range mapNode.Content {
+		if i%2 == 0 && ch.Kind == yaml.ScalarNode && ch.Value == key {
+			return mapNode.Content[i+1]
+		}
+	}
+	return nil
+}
--- a/internal/kubeconfig/contexts_test.go
+++ b/internal/kubeconfig/contexts_test.go
@@ -0,0 +1,89 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestKubeconfig_ContextNames(t *testing.T) {
+	tl := WithMockKubeconfigLoader(
+		testutil.KC().WithCtxs(
+			testutil.Ctx("abc"),
+			testutil.Ctx("def"),
+			testutil.Ctx("ghi")).Set("field1", map[string]string{"bar": "zoo"}).ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+
+	ctx := kc.ContextNames()
+	expected := []string{"abc", "def", "ghi"}
+	if diff := cmp.Diff(expected, ctx); diff != "" {
+		t.Fatalf("%s", diff)
+	}
+}
+
+func TestKubeconfig_ContextNames_noContextsEntry(t *testing.T) {
+	tl := WithMockKubeconfigLoader(`a: b`)
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	ctx := kc.ContextNames()
+	var expected []string = nil
+	if diff := cmp.Diff(expected, ctx); diff != "" {
+		t.Fatalf("%s", diff)
+	}
+}
+
+func TestKubeconfig_ContextNames_nonArrayContextsEntry(t *testing.T) {
+	tl := WithMockKubeconfigLoader(`contexts: "hello"`)
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	ctx := kc.ContextNames()
+	var expected []string = nil
+	if diff := cmp.Diff(expected, ctx); diff != "" {
+		t.Fatalf("%s", diff)
+	}
+}
+
+func TestKubeconfig_CheckContextExists(t *testing.T) {
+	tl := WithMockKubeconfigLoader(
+		testutil.KC().WithCtxs(
+			testutil.Ctx("c1"),
+			testutil.Ctx("c2")).ToYAML(t))
+
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+
+	if !kc.ContextExists("c1") {
+		t.Fatal("c1 actually exists; reported false")
+	}
+	if !kc.ContextExists("c2") {
+		t.Fatal("c2 actually exists; reported false")
+	}
+	if kc.ContextExists("c3") {
+		t.Fatal("c3 does not exist; but reported true")
+	}
+}
--- a/internal/kubeconfig/currentcontext.go
+++ b/internal/kubeconfig/currentcontext.go
@@ -0,0 +1,31 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+// GetCurrentContext returns "current-context" value in given
+// kubeconfig object Node, or returns "" if not found.
+func (k *Kubeconfig) GetCurrentContext() string {
+	v := valueOf(k.rootNode, "current-context")
+	if v == nil {
+		return ""
+	}
+	return v.Value
+}
+
+func (k *Kubeconfig) UnsetCurrentContext() error {
+	curCtxValNode := valueOf(k.rootNode, "current-context")
+	curCtxValNode.Value = ""
+	return nil
+}
--- a/internal/kubeconfig/currentcontext_test.go
+++ b/internal/kubeconfig/currentcontext_test.go
@@ -0,0 +1,69 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestKubeconfig_GetCurrentContext(t *testing.T) {
+	tl := WithMockKubeconfigLoader(`current-context: foo`)
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	v := kc.GetCurrentContext()
+
+	expected := "foo"
+	if v != expected {
+		t.Fatalf("expected=\"%s\"; got=\"%s\"", expected, v)
+	}
+}
+
+func TestKubeconfig_GetCurrentContext_missingField(t *testing.T) {
+	tl := WithMockKubeconfigLoader(`abc: def`)
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	v := kc.GetCurrentContext()
+
+	expected := ""
+	if v != expected {
+		t.Fatalf("expected=\"%s\"; got=\"%s\"", expected, v)
+	}
+}
+
+func TestKubeconfig_UnsetCurrentContext(t *testing.T) {
+	tl := WithMockKubeconfigLoader(testutil.KC().WithCurrentCtx("foo").ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(tl)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.UnsetCurrentContext(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	out := tl.Output()
+	expected := testutil.KC().WithCurrentCtx("").ToYAML(t)
+	if out != expected {
+		t.Fatalf("expected=\"%s\"; got=\"%s\"", expected, out)
+	}
+}
--- a/internal/kubeconfig/helper_test.go
+++ b/internal/kubeconfig/helper_test.go
@@ -0,0 +1,39 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"bytes"
+	"io"
+	"strings"
+)
+
+type MockKubeconfigLoader struct {
+	in  io.Reader
+	out bytes.Buffer
+}
+
+func (t *MockKubeconfigLoader) Read(p []byte) (n int, err error)  { return t.in.Read(p) }
+func (t *MockKubeconfigLoader) Write(p []byte) (n int, err error) { return t.out.Write(p) }
+func (t *MockKubeconfigLoader) Close() error                      { return nil }
+func (t *MockKubeconfigLoader) Reset() error                      { return nil }
+func (t *MockKubeconfigLoader) Load() ([]ReadWriteResetCloser, error) {
+	return []ReadWriteResetCloser{ReadWriteResetCloser(t)}, nil
+}
+func (t *MockKubeconfigLoader) Output() string { return t.out.String() }
+
+func WithMockKubeconfigLoader(kubecfg string) *MockKubeconfigLoader {
+	return &MockKubeconfigLoader{in: strings.NewReader(kubecfg)}
+}
--- a/internal/kubeconfig/kubeconfig.go
+++ b/internal/kubeconfig/kubeconfig.go
@@ -0,0 +1,86 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"io"
+
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v3"
+)
+
+type ReadWriteResetCloser interface {
+	io.ReadWriteCloser
+
+	// Reset truncates the file and seeks to the beginning of the file.
+	Reset() error
+}
+
+type Loader interface {
+	Load() ([]ReadWriteResetCloser, error)
+}
+
+type Kubeconfig struct {
+	loader Loader
+
+	f        ReadWriteResetCloser
+	rootNode *yaml.Node
+}
+
+func (k *Kubeconfig) WithLoader(l Loader) *Kubeconfig {
+	k.loader = l
+	return k
+}
+
+func (k *Kubeconfig) Close() error {
+	if k.f == nil {
+		return nil
+	}
+	return k.f.Close()
+}
+
+func (k *Kubeconfig) Parse() error {
+	files, err := k.loader.Load()
+	if err != nil {
+		return errors.Wrap(err, "failed to load")
+	}
+
+	// TODO since we don't support multiple kubeconfig files at the moment, there's just 1 file
+	f := files[0]
+
+	k.f = f
+	var v yaml.Node
+	if err := yaml.NewDecoder(f).Decode(&v); err != nil {
+		return errors.Wrap(err, "failed to decode")
+	}
+	k.rootNode = v.Content[0]
+	if k.rootNode.Kind != yaml.MappingNode {
+		return errors.New("kubeconfig file is not a map document")
+	}
+	return nil
+}
+
+func (k *Kubeconfig) Bytes() ([]byte, error) {
+	return yaml.Marshal(k.rootNode)
+}
+
+func (k *Kubeconfig) Save() error {
+	if err := k.f.Reset(); err != nil {
+		return errors.Wrap(err, "failed to reset file")
+	}
+	enc := yaml.NewEncoder(k.f)
+	enc.SetIndent(0)
+	return enc.Encode(k.rootNode)
+}
--- a/internal/kubeconfig/kubeconfig_test.go
+++ b/internal/kubeconfig/kubeconfig_test.go
@@ -0,0 +1,67 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestParse(t *testing.T) {
+	err := new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`a: [1, 2`)).Parse()
+	if err == nil {
+		t.Fatal("expected error from bad yaml")
+	}
+
+	err = new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`[1, 2, 3]`)).Parse()
+	if err == nil {
+		t.Fatal("expected error from not-mapping root node")
+	}
+
+	err = new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(`current-context: foo`)).Parse()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(testutil.KC().
+		WithCurrentCtx("foo").
+		WithCtxs().ToYAML(t))).Parse()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestSave(t *testing.T) {
+	in := "a: [1, 2, 3]\n"
+	test := WithMockKubeconfigLoader(in)
+	kc := new(Kubeconfig).WithLoader(test)
+	defer kc.Close()
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.ModifyCurrentContext("hello"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+	expected := "a: [1, 2, 3]\ncurrent-context: hello\n"
+	if diff := cmp.Diff(expected, test.Output()); diff != "" {
+		t.Fatal(diff)
+	}
+}
--- a/internal/kubeconfig/kubeconfigloader.go
+++ b/internal/kubeconfig/kubeconfigloader.go
@@ -0,0 +1,76 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+var (
+	DefaultLoader Loader = new(StandardKubeconfigLoader)
+)
+
+type StandardKubeconfigLoader struct{}
+
+type kubeconfigFile struct{ *os.File }
+
+func (*StandardKubeconfigLoader) Load() ([]ReadWriteResetCloser, error) {
+	cfgPath, err := kubeconfigPath()
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot determine kubeconfig path")
+	}
+
+	f, err := os.OpenFile(cfgPath, os.O_RDWR, 0)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, errors.Wrap(err, "kubeconfig file not found")
+		}
+		return nil, errors.Wrap(err, "failed to open file")
+	}
+
+	// TODO we'll return all kubeconfig files when we start implementing multiple kubeconfig support
+	return []ReadWriteResetCloser{ReadWriteResetCloser(&kubeconfigFile{f})}, nil
+}
+
+func (kf *kubeconfigFile) Reset() error {
+	if err := kf.Truncate(0); err != nil {
+		return errors.Wrap(err, "failed to truncate file")
+	}
+	_, err := kf.Seek(0, 0)
+	return errors.Wrap(err, "failed to seek in file")
+}
+
+func kubeconfigPath() (string, error) {
+	// KUBECONFIG env var
+	if v := os.Getenv("KUBECONFIG"); v != "" {
+		list := filepath.SplitList(v)
+		if len(list) > 1 {
+			// TODO KUBECONFIG=file1:file2 currently not supported
+			return "", errors.New("multiple files in KUBECONFIG are currently not supported")
+		}
+		return v, nil
+	}
+
+	// default path
+	home := cmdutil.HomeDir()
+	if home == "" {
+		return "", errors.New("HOME or USERPROFILE environment variable not set")
+	}
+	return filepath.Join(home, ".kube", "config"), nil
+}
--- a/internal/kubeconfig/kubeconfigloader_test.go
+++ b/internal/kubeconfig/kubeconfigloader_test.go
@@ -0,0 +1,83 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"github.com/ahmetb/kubectx/internal/cmdutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func Test_kubeconfigPath(t *testing.T) {
+	defer testutil.WithEnvVar("HOME", "/x/y/z")()
+
+	expected := filepath.FromSlash("/x/y/z/.kube/config")
+	got, err := kubeconfigPath()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != expected {
+		t.Fatalf("got=%q expected=%q", got, expected)
+	}
+}
+
+func Test_kubeconfigPath_noEnvVars(t *testing.T) {
+	defer testutil.WithEnvVar("XDG_CACHE_HOME", "")()
+	defer testutil.WithEnvVar("HOME", "")()
+	defer testutil.WithEnvVar("USERPROFILE", "")()
+
+	_, err := kubeconfigPath()
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+}
+
+func Test_kubeconfigPath_envOvveride(t *testing.T) {
+	defer testutil.WithEnvVar("KUBECONFIG", "foo")()
+
+	v, err := kubeconfigPath()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if expected := "foo"; v != expected {
+		t.Fatalf("expected=%q, got=%q", expected, v)
+	}
+}
+
+func Test_kubeconfigPath_envOvverideDoesNotSupportPathSeparator(t *testing.T) {
+	path := strings.Join([]string{"file1", "file2"}, string(os.PathListSeparator))
+	defer testutil.WithEnvVar("KUBECONFIG", path)()
+
+	_, err := kubeconfigPath()
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestStandardKubeconfigLoader_returnsNotFoundErr(t *testing.T) {
+	defer testutil.WithEnvVar("KUBECONFIG", "foo")()
+	kc := new(Kubeconfig).WithLoader(DefaultLoader)
+	err := kc.Parse()
+	if err == nil {
+		t.Fatal("expected err")
+	}
+	if !cmdutil.IsNotFoundErr(err) {
+		t.Fatalf("expected ENOENT error; got=%v", err)
+	}
+}
--- a/internal/kubeconfig/namespace.go
+++ b/internal/kubeconfig/namespace.go
@@ -0,0 +1,77 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import "gopkg.in/yaml.v3"
+
+const (
+	defaultNamespace = "default"
+)
+
+func (k *Kubeconfig) NamespaceOfContext(contextName string) (string, error) {
+	ctx, err := k.contextNode(contextName)
+	if err != nil {
+		return "", err
+	}
+	ctxBody := valueOf(ctx, "context")
+	if ctxBody == nil {
+		return defaultNamespace, nil
+	}
+	ns := valueOf(ctxBody, "namespace")
+	if ns == nil || ns.Value == "" {
+		return defaultNamespace, nil
+	}
+	return ns.Value, nil
+}
+
+func (k *Kubeconfig) SetNamespace(ctxName string, ns string) error {
+	ctxNode, err := k.contextNode(ctxName)
+	if err != nil {
+		return err
+	}
+
+	var ctxBodyNodeWasEmpty bool // actual namespace value is in contexts[index].context.namespace, but .context might not exist
+	ctxBodyNode := valueOf(ctxNode, "context")
+	if ctxBodyNode == nil {
+		ctxBodyNodeWasEmpty = true
+		ctxBodyNode = &yaml.Node{
+			Kind: yaml.MappingNode,
+		}
+	}
+
+	nsNode := valueOf(ctxBodyNode, "namespace")
+	if nsNode != nil {
+		nsNode.Value = ns
+		return nil
+	}
+
+	keyNode := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: "namespace",
+		Tag:   "!!str"}
+	valueNode := &yaml.Node{
+		Kind:  yaml.ScalarNode,
+		Value: ns,
+		Tag:   "!!str"}
+	ctxBodyNode.Content = append(ctxBodyNode.Content, keyNode, valueNode)
+	if ctxBodyNodeWasEmpty {
+		ctxNode.Content = append(ctxNode.Content, &yaml.Node{
+			Kind:  yaml.ScalarNode,
+			Value: "context",
+			Tag:   "!!str",
+		}, ctxBodyNode)
+	}
+	return nil
+}
--- a/internal/kubeconfig/namespace_test.go
+++ b/internal/kubeconfig/namespace_test.go
@@ -0,0 +1,94 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubeconfig
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func TestKubeconfig_NamespaceOfContext_ctxNotFound(t *testing.T) {
+	kc := new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(testutil.KC().
+		WithCtxs(testutil.Ctx("c1")).ToYAML(t)))
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := kc.NamespaceOfContext("c2")
+	if err == nil {
+		t.Fatal("expected err")
+	}
+}
+
+func TestKubeconfig_NamespaceOfContext(t *testing.T) {
+	kc := new(Kubeconfig).WithLoader(WithMockKubeconfigLoader(testutil.KC().
+		WithCtxs(
+			testutil.Ctx("c1"),
+			testutil.Ctx("c2").Ns("c2n1")).ToYAML(t)))
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+
+	v1, err := kc.NamespaceOfContext("c1")
+	if err != nil {
+		t.Fatal("expected err")
+	}
+	if expected := `default`; v1 != expected {
+		t.Fatalf("c1: expected=\"%s\" got=\"%s\"", expected, v1)
+	}
+
+	v2, err := kc.NamespaceOfContext("c2")
+	if err != nil {
+		t.Fatal("expected err")
+	}
+	if expected := `c2n1`; v2 != expected {
+		t.Fatalf("c2: expected=\"%s\" got=\"%s\"", expected, v2)
+	}
+}
+
+func TestKubeconfig_SetNamespace(t *testing.T) {
+	l := WithMockKubeconfigLoader(testutil.KC().
+		WithCtxs(
+			testutil.Ctx("c1"),
+			testutil.Ctx("c2").Ns("c2n1")).ToYAML(t))
+	kc := new(Kubeconfig).WithLoader(l)
+	if err := kc.Parse(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := kc.SetNamespace("c3", "foo"); err == nil {
+		t.Fatalf("expected error for non-existing ctx")
+	}
+
+	if err := kc.SetNamespace("c1", "c1n1"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.SetNamespace("c2", "c2n2"); err != nil {
+		t.Fatal(err)
+	}
+	if err := kc.Save(); err != nil {
+		t.Fatal(err)
+	}
+
+	expected := testutil.KC().WithCtxs(
+		testutil.Ctx("c1").Ns("c1n1"),
+		testutil.Ctx("c2").Ns("c2n2")).ToYAML(t)
+	if diff := cmp.Diff(l.Output(), expected); diff != "" {
+		t.Fatal(diff)
+	}
+}
--- a/internal/printer/color.go
+++ b/internal/printer/color.go
@@ -0,0 +1,54 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package printer
+
+import (
+	"os"
+
+	"github.com/fatih/color"
+
+	"github.com/ahmetb/kubectx/internal/env"
+)
+
+var (
+	ActiveItemColor = color.New(color.FgGreen, color.Bold)
+)
+
+func init() {
+	EnableOrDisableColor(ActiveItemColor)
+}
+
+// useColors returns true if colors are force-enabled,
+// false if colors are disabled, or nil for default behavior
+// which is determined based on factors like if stdout is tty.
+func useColors() *bool {
+	tr, fa := true, false
+	if os.Getenv(env.EnvForceColor) != "" {
+		return &tr
+	} else if os.Getenv(env.EnvNoColor) != "" {
+		return &fa
+	}
+	return nil
+}
+
+// EnableOrDisableColor determines if color should be force-enabled or force-disabled
+// or left untouched based on environment configuration.
+func EnableOrDisableColor(c *color.Color) {
+	if v := useColors(); v != nil && *v {
+		c.EnableColor()
+	} else if v != nil && !*v {
+		c.DisableColor()
+	}
+}
--- a/internal/printer/color_test.go
+++ b/internal/printer/color_test.go
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package printer
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+var (
+	tr, fa = true, false
+)
+
+func Test_useColors_forceColors(t *testing.T) {
+	defer testutil.WithEnvVar("_KUBECTX_FORCE_COLOR", "1")()
+	defer testutil.WithEnvVar("NO_COLOR", "1")()
+
+	if v := useColors(); !cmp.Equal(v, &tr) {
+		t.Fatalf("expected useColors() = true; got = %v", v)
+	}
+}
+
+func Test_useColors_disableColors(t *testing.T) {
+	defer testutil.WithEnvVar("NO_COLOR", "1")()
+
+	if v := useColors(); !cmp.Equal(v, &fa) {
+		t.Fatalf("expected useColors() = false; got = %v", v)
+	}
+}
+
+func Test_useColors_default(t *testing.T) {
+	defer testutil.WithEnvVar("NO_COLOR", "")()
+	defer testutil.WithEnvVar("_KUBECTX_FORCE_COLOR", "")()
+
+	if v := useColors(); v != nil {
+		t.Fatalf("expected useColors() = nil; got=%v", *v)
+	}
+}
--- a/internal/printer/printer.go
+++ b/internal/printer/printer.go
@@ -0,0 +1,59 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package printer
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/fatih/color"
+)
+
+var (
+	ErrorColor   = color.New(color.FgRed, color.Bold)
+	WarningColor = color.New(color.FgYellow, color.Bold)
+	SuccessColor = color.New(color.FgGreen)
+)
+
+func init() {
+	colors := useColors()
+	if colors == nil {
+		return
+	}
+	if *colors {
+		ErrorColor.EnableColor()
+		WarningColor.EnableColor()
+		SuccessColor.EnableColor()
+	} else {
+		ErrorColor.DisableColor()
+		WarningColor.DisableColor()
+		SuccessColor.DisableColor()
+	}
+}
+
+func Error(w io.Writer, format string, args ...interface{}) error {
+	_, err := fmt.Fprintf(w, ErrorColor.Sprint("error: ")+format+"\n", args...)
+	return err
+}
+
+func Warning(w io.Writer, format string, args ...interface{}) error {
+	_, err := fmt.Fprintf(w, WarningColor.Sprint("warning: ")+format+"\n", args...)
+	return err
+}
+
+func Success(w io.Writer, format string, args ...interface{}) error {
+	_, err := fmt.Fprintf(w, SuccessColor.Sprint("✔ ")+fmt.Sprintf(format+"\n", args...))
+	return err
+}
--- a/internal/testutil/kubeconfigbuilder.go
+++ b/internal/testutil/kubeconfigbuilder.go
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutil
+
+import (
+	"strings"
+	"testing"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Context struct {
+	Name    string `yaml:"name,omitempty"`
+	Context struct {
+		Namespace string `yaml:"namespace,omitempty"`
+	} `yaml:"context,omitempty"`
+}
+
+func Ctx(name string) *Context           { return &Context{Name: name} }
+func (c *Context) Ns(ns string) *Context { c.Context.Namespace = ns; return c }
+
+type Kubeconfig map[string]interface{}
+
+func KC() *Kubeconfig {
+	return &Kubeconfig{
+		"apiVersion": "v1",
+		"kind":       "Config"}
+}
+
+func (k *Kubeconfig) Set(key string, v interface{}) *Kubeconfig { (*k)[key] = v; return k }
+func (k *Kubeconfig) WithCurrentCtx(s string) *Kubeconfig       { (*k)["current-context"] = s; return k }
+func (k *Kubeconfig) WithCtxs(c ...*Context) *Kubeconfig        { (*k)["contexts"] = c; return k }
+
+func (k *Kubeconfig) ToYAML(t *testing.T) string {
+	t.Helper()
+	var v strings.Builder
+	if err := yaml.NewEncoder(&v).Encode(*k); err != nil {
+		t.Fatalf("failed to encode mock kubeconfig: %v", err)
+	}
+	return v.String()
+}
--- a/internal/testutil/tempfile.go
+++ b/internal/testutil/tempfile.go
@@ -0,0 +1,40 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutil
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TempFile(t *testing.T, contents string) (path string, cleanup func()) {
+	// TODO consider removing, used only in one place.
+	t.Helper()
+
+	f, err := ioutil.TempFile(os.TempDir(), "test-file")
+	if err != nil {
+		t.Fatalf("failed to create test file: %v", err)
+	}
+	path = f.Name()
+	if _, err := f.Write([]byte(contents)); err != nil {
+		t.Fatalf("failed to write to test file: %v", err)
+	}
+
+	return path, func() {
+		f.Close()
+		os.Remove(path)
+	}
+}
--- a/internal/testutil/testutil.go
+++ b/internal/testutil/testutil.go
@@ -0,0 +1,31 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package testutil
+
+import "os"
+
+// WithEnvVar sets an env var temporarily. Call its return value
+// in defer to restore original value in env (if exists).
+func WithEnvVar(key, value string) func() {
+	orig, ok := os.LookupEnv(key)
+	os.Setenv(key, value)
+	return func() {
+		if ok {
+			os.Setenv(key, orig)
+		} else {
+			os.Unsetenv(key)
+		}
+	}
+}
--- a/34
+++ b/34
@@ -22,14 +22,16 @@ set -eou pipefail
 IFS=$'\n\t'

 SELF_CMD="$0"
-SELF="kubectx"
-if [[ "$(basename "$0")" == kubectl-* ]]; then # invoked as plugin
-  SELF="kubectl ctx"
-fi

 KUBECTX="${XDG_CACHE_HOME:-$HOME/.kube}/kubectx"

 usage() {
+  local SELF
+  SELF="kubectx"
+  if [[ "$(basename "$0")" == kubectl-* ]]; then # invoked as plugin
+    SELF="kubectl ctx"
+  fi
+
  cat <<EOF
 USAGE:
  $SELF                       : list the contexts
@@ -41,6 +43,7 @@ USAGE:
  $SELF -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
                                  (this command won't delete the user/cluster entry
                                  that is used by the context)
+  $SELF -u, --unset           : unset the current context

  $SELF -h,--help             : show this message
 EOF
@@ -183,14 +186,21 @@ delete_context() {
  $KUBECTL config delete-context "${ctx}"
 }

+unset_context() {
+  echo "Unsetting current context." >&2
+  $KUBECTL config unset current-context
+}
+
 main() {
-  if hash kubectl 2>/dev/null; then
-    KUBECTL=kubectl
-  elif hash kubectl.exe 2>/dev/null; then
-    KUBECTL=kubectl.exe
-  else
-    echo >&2 "kubectl is not installed"
-    exit 1
+  if [[ -z "${KUBECTL:-}" ]]; then
+    if hash kubectl 2>/dev/null; then
+      KUBECTL=kubectl
+    elif hash kubectl.exe  2>/dev/null; then
+      KUBECTL=kubectl.exe
+    else
+      echo >&2 "kubectl is not installed"
+      exit 1
+    fi
  fi

  if [[ "$#" -eq 0 ]]; then
@@ -218,6 +228,8 @@ main() {
      # - it does not fail when current-context property is not set
      # - it does not return a trailing newline
      kubectl config current-context
+    elif [[ "${1}" == '-u' || "${1}" == '--unset' ]]; then
+      unset_context
    elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
      usage
    elif [[ "${1}" =~ ^-(.*) ]]; then
--- a/10
+++ b/10
@@ -22,14 +22,16 @@ set -eou pipefail
 IFS=$'\n\t'

 SELF_CMD="$0"
-SELF="kubens"
-if [[ "$(basename "$0")" == kubectl-* ]]; then # invoked as plugin
-  SELF="kubectl ns"
-fi

 KUBENS_DIR="${XDG_CACHE_HOME:-$HOME/.kube}/kubens"

 usage() {
+  local SELF
+  SELF="kubens"
+  if [[ "$(basename "$0")" == kubectl-* ]]; then # invoked as plugin
+    SELF="kubectl ns"
+  fi
+
  cat <<EOF
 USAGE:
  $SELF                    : list the namespaces in the current context
--- a/test/kubectx.bats
+++ b/test/kubectx.bats
@@ -1,19 +1,9 @@
 #!/usr/bin/env bats

-COMMAND="$BATS_TEST_DIRNAME/../kubectx"
+COMMAND="${COMMAND:-$BATS_TEST_DIRNAME/../kubectx}"

 load common

-@test "no kubectl detected" {
-  OLDPATH="$PATH"
-  PATH=/bin
-  run ${COMMAND}
-  echo "$output"
-  [ "$status" -eq 1 ]
-  [[ "$output" = "kubectl is not installed" ]]
-  PATH="$OLDPATH"
-}
-
@test "--help should not fail" {
  run ${COMMAND} --help
  echo "$output"
@@ -32,14 +22,14 @@ load common
  run ${COMMAND} -
  echo "$output"
  [ "$status" -eq 1 ]
-  [[ "$output" = "error: No previous context found." ]]
+  [[ $output = *"no previous context found" ]]
 }

@test "list contexts when no kubeconfig exists" {
  run ${COMMAND}
  echo "$output"
  [ "$status" -eq 0 ]
-  [[ "$output" = "" ]]
+  [[ "$output" = "warning: kubeconfig file not found" ]]
 }

@test "get one context and list contexts" {
@@ -239,3 +229,16 @@ load common
  [ "$status" -eq 0 ]
  [[ "$output" = "user2@cluster1" ]]
 }
+
+@test "unset selected context" {
+  use_config config2
+
+  run ${COMMAND} user1@cluster1
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND} -u
+  [ "$status" -eq 0 ]
+
+  run ${COMMAND} -c
+  [ "$status" -ne 0 ]
+}
--- a/test/kubens.bats
+++ b/test/kubens.bats
@@ -1,8 +1,13 @@
 #!/usr/bin/env bats

-COMMAND="${BATS_TEST_DIRNAME}/../kubens"
+COMMAND="${COMMAND:-$BATS_TEST_DIRNAME/../kubens}"
+
+# TODO(ahmetb) remove this after bash implementations are deleted
 export KUBECTL="$BATS_TEST_DIRNAME/../test/mock-kubectl"

+# short-circuit namespace querying in kubens go implementation
+export _MOCK_NAMESPACES=1
+
 load common

@test "--help should not fail" {
@@ -21,7 +26,6 @@ load common
  run ${COMMAND}
  echo "$output"
  [[ "$status" -eq 1 ]]
-  [[ "$output" = *"current-context is not set"* ]]
 }

@test "list namespaces" {
Author	SHA1	Message	Date
Ahmet Alp Balkan	55548e15ed	Release v0.9.2	2021-02-24 11:21:15 -08:00
Andrey Viktorov	9b4aea3b59	Bump up go-client to fix auth plugin panic (#281 )	2021-02-02 15:38:27 -08:00
Jeff MAURY	767218a9a6	Check correct variable after current namespace retrieval (#287 )	2021-01-31 17:48:35 -08:00
Ahmet Alp Balkan	438ba19fb0	Update debian installation instructions Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-12-29 13:40:14 -08:00
Ahmet Alp Balkan	1e49c336fc	Add license headers for 2021 Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-12-29 13:38:42 -08:00
Jason Harmon	8c323c5653	Fix color in kubens success message when using fzf (#228 )	2020-11-16 09:01:28 -08:00
Chris Stefano	9527e308e5	make kubectx consistent with kubens wrt. KUBECTL environment variable (#274 )	2020-11-13 16:09:28 -08:00
Carlos Alexandro Becker	8241576f28	fix: improve kubectx completion on fish (#269 )	2020-11-01 21:45:40 -08:00
Justin Garrison	5aba9fa311	Add Homebrew install for Linux (#261 ) * Add Homebrew install for Linux Is there a reason why `brew` install instructions isn't included for Linux? Because it's bash I'm able to install it just fine with brew on Ubuntu. * Rearange Linux install sections	2020-09-25 14:37:59 -07:00
Gábor Lipták	a8a63da51c	Bump CI to Go 1.15 (#266 )	2020-09-25 13:25:03 -07:00
Gábor Lipták	8c8aeada3d	Correct build badge in README (#265 )	2020-09-25 13:24:51 -07:00
Gábor Lipták	ab50545ecd	Bump CI release to Go 1.15 (#267 )	2020-09-25 13:24:25 -07:00
Ahmet Alp Balkan	51c61b862d	Add ppc64le build Not tagging a release for now. This only causes linux/ppc64le binaries to be created for now. Closes #252. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-07-08 11:37:10 -07:00
Ahmet Alp Balkan	09f31d96e4	Release v0.9.1	2020-06-30 13:02:11 -07:00
Rajat Jindal	0813c314c6	Add krew release bot back (#245 )	2020-06-22 10:37:07 -07:00
Sedat Gökcen	1db00a20d9	Structural refactoring for multiple kubeconfig support (#219 )	2020-06-02 13:04:13 -07:00
Ahmet Alp Balkan	170233bffd	query namespace exists with GET Namespace (#236 ) More efficient ns switches with kubens by querying only the namespace (instead of listing all namespaces). Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-05-31 15:32:44 -07:00
Ahmet Alp Balkan	0141ee19d2	handle ctxs with ':' in the name for windows (#235 ) For windows, if the ctx name for kubens state file contains a colon ':' (EKS), we replace it with __ (both while reading/writing). It doesn't break existing users (as it didn't work in the first place). Other characters remain unhandled, hoping it won't happen again. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-05-31 14:24:01 -07:00
Jason Harmon	401188fefd	Fix color output on Windows (#220 )	2020-05-15 15:26:00 -07:00
Ahmet Alp Balkan	01bd237baa	Release for arm64 (armv8) and armhf (armv6), armv7 (#217 )	2020-05-04 14:56:20 -07:00
Ahmet Alp Balkan	956d5953c2	kubens: fix interactive switch messages Fixes #209. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-30 07:36:21 -07:00
Ahmet Alp Balkan	4425628f91	Remove changelog Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-30 07:36:21 -07:00
Curro Rodriguez	f2021bb08b	changed help in kubens, return had a typo (#210 )	2020-04-30 07:34:06 -07:00
Ahmet Alp Balkan	d603c7dada	Release v0.9.0	2020-04-29 13:52:03 -07:00
Ahmet Alp Balkan	ba79bdb0f8	Update readme to talk about Go rewrite Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:51:19 -07:00
Ahmet Alp Balkan	fc21b8c522	Update readme, update bats setup Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:45:40 -07:00
Ahmet Alp Balkan	e5024778a9	Add integration tests to CI workflow Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:40:11 -07:00
Ahmet Alp Balkan	d669862436	Update CI workflow name Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:30:55 -07:00
Ahmet Alp Balkan	7f3f0699b3	Extend CI workflow with gofmt Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:28:12 -07:00
Ahmet Alp Balkan	3c9c44842c	Extend CI workflow by adding tests Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:22:42 -07:00
Ahmet Alp Balkan	0491ac552e	Add goreleaser and github workflows Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 13:18:14 -07:00
Ahmet Alp Balkan	5348d7aa7e	kubens add a short-circuit to bypass API call for tests Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	04689f571e	ns list: increase page size to 500 Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	1881107d55	Load namespaces using client-go Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	52bbf5c786	fix compile error Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	4bbe0fad79	deprecation msgs for KUBECTX_CURRENT_{BG,FG}COLOR Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	5b745727c3	Add interactive switching to kubens Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	fc2e1c6b08	Fix bug about where cur ns was stored in yaml Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	2915103e3d	kubens: implement namespace switching Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	6c3977d574	kubens: Add facility to store state file Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	de2867a622	Implement list (via exec kubectl), clearer color settings Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	c4252b5795	Move kubeconfig loader utils to cmdutil pkg Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	1982becb15	kubens: Start implementing stubs Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	342d21683b	Create test utils for crafting kubeconfig strings Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	62d8dad7d5	extract kubeconfig test utils to a type Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	68b842f39b	do not fail on non-existing kubeconfig files Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	0e50f15393	Better success msgs, handle -d without args Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	f4f558004a	Tidy up colors, help msgs, TODOs Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	7598c4d4dd	Create printer pkg, fix color force enable/disable Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	bef0a4cca7	Move kubeconfig utility to a shared pkg Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:56 -07:00
Ahmet Alp Balkan	d5546f062d	Extend test coverage Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	bf5b715798	Fix UnsupportedOp tests through custom comparer Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	a01db6ecde	Re-introduce DEBUG env var stack traces Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	280fcec765	Update tests for homeDir and kubeconfigPath() Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	c82e299daa	Unify errors from kubeconfig.Parse Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	5aaccdf801	Extract env vars to a file + test Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	936964dde5	Support for fzf, color ignore/force knobs Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	1f4eed962a	Move all yaml logic to pkg/kubeconfig Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	492e3e7053	Move ctx-related YAML parse methods to pkg Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	7013899503	Use kubeconfig pkg for parsing utils Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	7f3e441ff2	kubeconfig pkg for loading/parsing Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	bb95141fc5	add printSuccess, pass writers to print funcs Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	28051b1fd7	define Run(stdout,stderr) method on **Ops Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	5b3796ba1c	add some TODOs Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	1284b822a5	Fix bugs for test pass, update tests Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	cb103701ac	Add support for renaming contexts Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	5eabeab47e	Support for -d (deleting contexts) Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	c5f17b83e7	Add support for -u/--unset Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	94e8d3b4c7	Add support for -c/--current Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:55 -07:00
Ahmet Alp Balkan	ff6326c122	Integrate ctx swap, check for wrong ctx names Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	8aaefb8a94	Save last context name in state file Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	f51f8be7f9	Add utils for r/w ~/.kube/kubectx file Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	4fdd2898b7	Implement switch via editing yaml in-place Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	3c6fa48260	Implement context listing Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	b1afdbf375	Implement facilities to parse kubeconfig file Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	3fdc1855c0	Add logic to determine kubeconfig path Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	df8957403c	Support help op, add color to error Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	eee1c23654	Handle supported operation in main Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
Ahmet Alp Balkan	6c9273e582	Start porting to Go: parse flags Parse help/list/swap command line flags. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2020-04-29 12:52:54 -07:00
drorlevywork	37c765684f	feat(completion): Improve kubens fish completions (#204 ) This change covers all of the supported arguments and switches for the kubens command Co-authored-by: Dror Levy <Dror@tablecheck.com>	2020-04-17 08:30:17 -07:00
Ahmet Alp Balkan	d0c9679d85	Update README.md	2020-04-07 14:30:29 -07:00
Ahmet Alp Balkan	e388bfa616	Remove ubuntu indication from install guide	2020-04-07 14:28:24 -07:00
Sébastien Maintrot	db8b706612	Update README about fzf and Unix composability (#197 )	2020-03-08 10:24:24 -07:00
Rajat Jindal	06289683dd	use v0.0.37 of krew-release-bot (#196 ) use v0.0.37 of krew-release-bot	2020-02-29 08:51:38 -08:00
Ahmet Alp Balkan	d3295e5b7a	Release v0.8.0	2020-02-20 15:12:06 -08:00
rob salmond	3369d42e2d	add unset flag (#187 ) * add unset flag * test unsetting selected context * update readme with new unset flag * testdata notes * set a current context * cleanup * omit fixture changes	2020-02-04 09:39:47 -08:00
Rajat Jindal	f48c4198e7	Add krew-release-bot support (#189 ) * try github actions * create release * open pr using krew-release-bot	2020-01-22 11:30:36 -08:00
Ahmet Alp Balkan	26d3422917	Install option as a kubectl plugin (#182 ) Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2019-11-11 11:19:34 -08:00
Ahmet Alp Balkan	56e30d2b43	Detect invocation style only in usage() (#183 ) - removes global SELF variable - fixes #181 Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>	2019-11-11 11:15:48 -08:00