Introduce -c/--current options for kubectx/kubens (#171)

Per #127 the user community wants to have this feature, primarily as
-c and --current flags.

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

README.md

@@ -24,6 +24,7 @@ USAGE:
   kubectx                   : list the contexts
   kubectx <NAME>            : switch to context <NAME>
   kubectx -                 : switch to the previous context
+  kubectx -c, --current     : show the current context name
   kubectx <NEW_NAME>=<NAME> : rename context <NAME> to <NEW_NAME>
   kubectx <NEW_NAME>=.      : rename current-context to <NEW_NAME>
   kubectx -d <NAME>         : delete context <NAME> ('.' for current-context)
@@ -62,6 +63,7 @@ USAGE:
   kubens                    : list the namespaces
   kubens <NAME>             : change the active namespace
   kubens -                  : switch to the previous namespace
+  kubens -c, --current      : show the current namespace
 ```
 
 

kubectx

@@ -30,6 +30,7 @@ USAGE:
   kubectx                       : list the contexts
   kubectx <NAME>                : switch to context <NAME>
   kubectx -                     : switch to the previous context
+  kubectx -c, --current         : show the current context name
   kubectx <NEW_NAME>=<NAME>     : rename context <NAME> to <NEW_NAME>
   kubectx <NEW_NAME>=.          : rename current-context to <NEW_NAME>
   kubectx -d <NAME> [<NAME...>] : delete context <NAME> ('.' for current-context)
@@ -207,6 +208,11 @@ main() {
   elif [[ "$#" -eq 1 ]]; then
     if [[ "${1}" == "-" ]]; then
       swap_context
+    elif [[ "${1}" == '-c' || "${1}" == '--current' ]]; then
+      # we don't call current_context here for two reasons:
+      # - it does not fail when current-context property is not set
+      # - it does not return a trailing newline
+      kubectl config current-context
     elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
       usage
     elif [[ "${1}" =~ ^-(.*) ]]; then

kubens

@@ -30,6 +30,7 @@ USAGE:
   kubens                    : list the namespaces in the current context
   kubens <NAME>             : change the active namespace of current context
   kubens -                  : switch to the previous namespace in this context
+  kubens -c, --current      : show the current namespace
   kubens -h,--help          : show this message
 EOF
 }
@@ -197,6 +198,8 @@ main() {
       usage
     elif [[ "${1}" == "-" ]]; then
       swap_namespace
+    elif [[ "${1}" == '-c' || "${1}" == '--current' ]]; then
+      current_namespace
     elif [[ "${1}" =~ ^-(.*) ]]; then
       echo "error: unrecognized flag \"${1}\"" >&2
       usage

test/kubectx.bats

@@ -113,6 +113,33 @@ load common
   [ "$status" -eq 1 ]
 }
 
+@test "-c/--current fails when no context set" {
+  use_config config1
+
+  run "${COMMAND}" -c
+  echo "$output"
+  [ $status -eq 1 ]
+  run "${COMMAND}" --current
+  echo "$output"
+  [ $status -eq 1 ]
+}
+
+@test "-c/--current prints the current context" {
+  use_config config1
+
+  run "${COMMAND}" user1@cluster1
+  [ $status -eq 0 ]
+
+  run "${COMMAND}" -c
+  echo "$output"
+  [ $status -eq 0 ]
+  [[ "$output" = "user1@cluster1" ]]
+  run "${COMMAND}" --current
+  echo "$output"
+  [ $status -eq 0 ]
+  [[ "$output" = "user1@cluster1" ]]
+}
+
 @test "rename context" {
   use_config config2
 

test/kubens.bats

@@ -102,3 +102,43 @@ load common
   [[ "$status" -eq 1 ]]
   [[ "$output" = *"current-context is not set"* ]]
 }
+
+@test "-c/--current works when no namespace is set on context" {
+  use_config config1
+  switch_context user1@cluster1
+
+  run ${COMMAND} "-c"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "default" ]]
+  run ${COMMAND} "--current"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "default" ]]
+}
+
+@test "-c/--current prints the namespace after it is set" {
+  use_config config1
+  switch_context user1@cluster1
+  ${COMMAND} ns1
+
+  run ${COMMAND} "-c"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "ns1" ]]
+  run ${COMMAND} "--current"
+  echo "$output"
+  [[ "$status" -eq 0 ]]
+  [[ "$output" = "ns1" ]]
+}
+
+@test "-c/--current fails when current context is not set" {
+  use_config config1
+  run ${COMMAND} -c
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+
+  run ${COMMAND} --current
+  echo "$output"
+  [[ "$status" -eq 1 ]]
+}