diff --git a/pkg/kubectl/cmd/templates/markdown.go b/pkg/kubectl/cmd/templates/markdown.go new file mode 100644 index 00000000000..1a19f89fd4c --- /dev/null +++ b/pkg/kubectl/cmd/templates/markdown.go @@ -0,0 +1,145 @@ +/* +Copyright 2016 The Kubernetes Authors. + +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 templates + +import ( + "bytes" + "fmt" + "strings" + + "github.com/russross/blackfriday" +) + +const linebreak = "\n" + +// ASCIIRenderer implements blackfriday.Renderer +var _ blackfriday.Renderer = &ASCIIRenderer{} + +// ASCIIRenderer is a blackfriday.Renderer intended for rendering markdown +// documents as plain text, well suited for human reading on terminals. +type ASCIIRenderer struct { + Indentation string + + listItemCount uint + listLevel uint +} + +// NormalText gets a text chunk *after* the markdown syntax was already +// processed and does a final cleanup on things we don't expect here, like +// removing linebreaks on things that are not a paragraph break (auto unwrap). +func (r *ASCIIRenderer) NormalText(out *bytes.Buffer, text []byte) { + raw := string(text) + lines := strings.Split(raw, linebreak) + for _, line := range lines { + trimmed := strings.Trim(line, " \n\t") + out.WriteString(trimmed) + out.WriteString(" ") + } +} + +// List renders the start and end of a list. +func (r *ASCIIRenderer) List(out *bytes.Buffer, text func() bool, flags int) { + r.listLevel++ + out.WriteString(linebreak) + text() + r.listLevel-- +} + +// ListItem renders list items and supports both ordered and unordered lists. +func (r *ASCIIRenderer) ListItem(out *bytes.Buffer, text []byte, flags int) { + if flags&blackfriday.LIST_ITEM_BEGINNING_OF_LIST != 0 { + r.listItemCount = 1 + } else { + r.listItemCount++ + } + indent := strings.Repeat(r.Indentation, int(r.listLevel)) + var bullet string + if flags&blackfriday.LIST_TYPE_ORDERED != 0 { + bullet += fmt.Sprintf("%d.", r.listItemCount) + } else { + bullet += "*" + } + out.WriteString(indent + bullet + " ") + r.fw(out, text) + out.WriteString(linebreak) +} + +// Paragraph renders the start and end of a paragraph. +func (r *ASCIIRenderer) Paragraph(out *bytes.Buffer, text func() bool) { + out.WriteString(linebreak) + text() + out.WriteString(linebreak) +} + +// BlockCode renders a chunk of text that represents source code. +func (r *ASCIIRenderer) BlockCode(out *bytes.Buffer, text []byte, lang string) { + out.WriteString(linebreak) + lines := []string{} + for _, line := range strings.Split(string(text), linebreak) { + indented := r.Indentation + line + lines = append(lines, indented) + } + out.WriteString(strings.Join(lines, linebreak)) +} + +func (r *ASCIIRenderer) GetFlags() int { return 0 } +func (r *ASCIIRenderer) HRule(out *bytes.Buffer) { + out.WriteString(linebreak + "----------" + linebreak) +} +func (r *ASCIIRenderer) LineBreak(out *bytes.Buffer) { out.WriteString(linebreak) } +func (r *ASCIIRenderer) TitleBlock(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) Header(out *bytes.Buffer, text func() bool, level int, id string) { text() } +func (r *ASCIIRenderer) BlockHtml(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) BlockQuote(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) TableRow(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) TableHeaderCell(out *bytes.Buffer, text []byte, align int) { r.fw(out, text) } +func (r *ASCIIRenderer) TableCell(out *bytes.Buffer, text []byte, align int) { r.fw(out, text) } +func (r *ASCIIRenderer) Footnotes(out *bytes.Buffer, text func() bool) { text() } +func (r *ASCIIRenderer) FootnoteItem(out *bytes.Buffer, name, text []byte, flags int) { r.fw(out, text) } +func (r *ASCIIRenderer) AutoLink(out *bytes.Buffer, link []byte, kind int) { r.fw(out, link) } +func (r *ASCIIRenderer) CodeSpan(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) DoubleEmphasis(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) Emphasis(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) RawHtmlTag(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) TripleEmphasis(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) StrikeThrough(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) FootnoteRef(out *bytes.Buffer, ref []byte, id int) { r.fw(out, ref) } +func (r *ASCIIRenderer) Entity(out *bytes.Buffer, entity []byte) { r.fw(out, entity) } +func (r *ASCIIRenderer) Smartypants(out *bytes.Buffer, text []byte) { r.fw(out, text) } +func (r *ASCIIRenderer) DocumentHeader(out *bytes.Buffer) {} +func (r *ASCIIRenderer) DocumentFooter(out *bytes.Buffer) {} +func (r *ASCIIRenderer) TocHeaderWithAnchor(text []byte, level int, anchor string) {} +func (r *ASCIIRenderer) TocHeader(text []byte, level int) {} +func (r *ASCIIRenderer) TocFinalize() {} + +func (r *ASCIIRenderer) Table(out *bytes.Buffer, header []byte, body []byte, columnData []int) { + r.fw(out, header, body) +} + +func (r *ASCIIRenderer) Link(out *bytes.Buffer, link []byte, title []byte, content []byte) { + r.fw(out, link) +} + +func (r *ASCIIRenderer) Image(out *bytes.Buffer, link []byte, title []byte, alt []byte) { + r.fw(out, link) +} + +func (r *ASCIIRenderer) fw(out *bytes.Buffer, text ...[]byte) { + for _, t := range text { + out.Write(t) + } +} diff --git a/pkg/kubectl/cmd/templates/normalizers.go b/pkg/kubectl/cmd/templates/normalizers.go new file mode 100644 index 00000000000..eedd089c20f --- /dev/null +++ b/pkg/kubectl/cmd/templates/normalizers.go @@ -0,0 +1,91 @@ +/* +Copyright 2016 The Kubernetes Authors. + +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 templates + +import ( + "strings" + + "github.com/MakeNowJust/heredoc" + "github.com/russross/blackfriday" + "github.com/spf13/cobra" +) + +const Indentation = ` ` + +// LongDesc normalizes a command's long description to follow the conventions. +func LongDesc(s string) string { + return normalizer{s}.heredoc().markdown().trim().string +} + +// Examples normalizes a command's examples to follow the conventions. +func Examples(s string) string { + return normalizer{s}.trim().indent().string +} + +// Normalize perform all required normalizations on a given command. +func Normalize(cmd *cobra.Command) *cobra.Command { + if len(cmd.Long) > 0 { + cmd.Long = LongDesc(cmd.Long) + } + if len(cmd.Example) > 0 { + cmd.Example = Examples(cmd.Example) + } + return cmd +} + +// NormalizeAll perform all required normalizations in the entire command tree. +func NormalizeAll(cmd *cobra.Command) *cobra.Command { + if cmd.HasSubCommands() { + for _, subCmd := range cmd.Commands() { + NormalizeAll(subCmd) + } + } + Normalize(cmd) + return cmd +} + +type normalizer struct { + string +} + +func (s normalizer) markdown() normalizer { + bytes := []byte(s.string) + formatted := blackfriday.Markdown(bytes, &ASCIIRenderer{Indentation: Indentation}, 0) + s.string = string(formatted) + return s +} + +func (s normalizer) heredoc() normalizer { + s.string = heredoc.Doc(s.string) + return s +} + +func (s normalizer) trim() normalizer { + s.string = strings.TrimSpace(s.string) + return s +} + +func (s normalizer) indent() normalizer { + indentedLines := []string{} + for _, line := range strings.Split(s.string, "\n") { + trimmed := strings.TrimSpace(line) + indented := Indentation + trimmed + indentedLines = append(indentedLines, indented) + } + s.string = strings.Join(indentedLines, "\n") + return s +} diff --git a/pkg/kubectl/cmd/templates/templates.go b/pkg/kubectl/cmd/templates/templates.go index d89e6007481..45a4aa3fd7a 100644 --- a/pkg/kubectl/cmd/templates/templates.go +++ b/pkg/kubectl/cmd/templates/templates.go @@ -62,7 +62,7 @@ Aliases: `{{if .HasExample}} Examples: -{{ indentLines (.Example | trimLeft) 2 }}{{end}}` + +{{ .Example}}{{end}}` + // SUBCOMMANDS `{{ if .HasAvailableSubCommands}}