Replace the current Zsh completion with a Zsh completion solution based
on Go completions. This allows to support custom completions (based
on Go completions), but also to standardize the behavior of completion
across all shells.
Also, add support to Go completions for the bash completion annotations:
BashCompFilenameExt (including Command.MarkFlagFilename() family)
- still supported by zsh
BashCompSubdirsInDir - now supported by zsh
BashCompOneRequiredFlag (including Command.MarkFlagRequired() family)
- now supported by zsh and fish
Finally, remove the suggestin of the = form of flag completion.
The = form is supported, but it will not be suggested to avoid having
duplicated suggestions.
This commit is contained in:
Marc Khouzam
GitHub
@ -1,336 +1,235 @@
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package cobra
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import (
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"encoding/json"
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"bytes"
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"fmt"
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"io"
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"os"
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"sort"
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"strings"
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"text/template"
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"github.com/spf13/pflag"
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)
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const (
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zshCompArgumentAnnotation = "cobra_annotations_zsh_completion_argument_annotation"
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zshCompArgumentFilenameComp = "cobra_annotations_zsh_completion_argument_file_completion"
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zshCompArgumentWordComp = "cobra_annotations_zsh_completion_argument_word_completion"
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zshCompDirname = "cobra_annotations_zsh_dirname"
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)
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var (
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zshCompFuncMap = template.FuncMap{
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"genZshFuncName": zshCompGenFuncName,
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"extractFlags": zshCompExtractFlag,
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"genFlagEntryForZshArguments": zshCompGenFlagEntryForArguments,
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"extractArgsCompletions": zshCompExtractArgumentCompletionHintsForRendering,
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}
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zshCompletionText = `
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{{/* should accept Command (that contains subcommands) as parameter */}}
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{{define "argumentsC" -}}
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{{ $cmdPath := genZshFuncName .}}
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function {{$cmdPath}} {
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local -a commands
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_arguments -C \{{- range extractFlags .}}
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{{genFlagEntryForZshArguments .}} \{{- end}}
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"1: :->cmnds" \
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"*::arg:->args"
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case $state in
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cmnds)
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commands=({{range .Commands}}{{if not .Hidden}}
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"{{.Name}}:{{.Short}}"{{end}}{{end}}
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)
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_describe "command" commands
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;;
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esac
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case "$words[1]" in {{- range .Commands}}{{if not .Hidden}}
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{{.Name}})
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{{$cmdPath}}_{{.Name}}
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;;{{end}}{{end}}
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esac
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}
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{{range .Commands}}{{if not .Hidden}}
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{{template "selectCmdTemplate" .}}
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{{- end}}{{end}}
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{{- end}}
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{{/* should accept Command without subcommands as parameter */}}
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{{define "arguments" -}}
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function {{genZshFuncName .}} {
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{{" _arguments"}}{{range extractFlags .}} \
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{{genFlagEntryForZshArguments . -}}
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{{end}}{{range extractArgsCompletions .}} \
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{{.}}{{end}}
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}
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{{end}}
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{{/* dispatcher for commands with or without subcommands */}}
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{{define "selectCmdTemplate" -}}
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{{if .Hidden}}{{/* ignore hidden*/}}{{else -}}
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{{if .Commands}}{{template "argumentsC" .}}{{else}}{{template "arguments" .}}{{end}}
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{{- end}}
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{{- end}}
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{{/* template entry point */}}
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{{define "Main" -}}
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#compdef _{{.Name}} {{.Name}}
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{{template "selectCmdTemplate" .}}
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{{end}}
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`
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)
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// zshCompArgsAnnotation is used to encode/decode zsh completion for
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// arguments to/from Command.Annotations.
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type zshCompArgsAnnotation map[int]zshCompArgHint
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type zshCompArgHint struct {
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// Indicates the type of the completion to use. One of:
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// zshCompArgumentFilenameComp or zshCompArgumentWordComp
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Tipe string `json:"type"`
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// A value for the type above (globs for file completion or words)
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Options []string `json:"options"`
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}
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// GenZshCompletionFile generates zsh completion file.
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// GenZshCompletionFile generates zsh completion file including descriptions.
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func (c *Command) GenZshCompletionFile(filename string) error {
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return c.genZshCompletionFile(filename, true)
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}
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// GenZshCompletion generates zsh completion file including descriptions
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// and writes it to the passed writer.
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func (c *Command) GenZshCompletion(w io.Writer) error {
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return c.genZshCompletion(w, true)
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}
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// GenZshCompletionFileNoDesc generates zsh completion file without descriptions.
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func (c *Command) GenZshCompletionFileNoDesc(filename string) error {
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return c.genZshCompletionFile(filename, false)
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}
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// GenZshCompletionNoDesc generates zsh completion file without descriptions
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// and writes it to the passed writer.
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func (c *Command) GenZshCompletionNoDesc(w io.Writer) error {
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return c.genZshCompletion(w, false)
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}
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// MarkZshCompPositionalArgumentFile only worked for zsh and its behavior was
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// not consistent with Bash completion. It has therefore been disabled.
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// Instead, when no other completion is specified, file completion is done by
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// default for every argument. One can disable file completion on a per-argument
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// basis by using ValidArgsFunction and ShellCompDirectiveNoFileComp.
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// To achieve file extension filtering, one can use ValidArgsFunction and
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// ShellCompDirectiveFilterFileExt.
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//
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// Deprecated
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func (c *Command) MarkZshCompPositionalArgumentFile(argPosition int, patterns ...string) error {
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return nil
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}
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// MarkZshCompPositionalArgumentWords only worked for zsh. It has therefore
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// been disabled.
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// To achieve the same behavior across all shells, one can use
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// ValidArgs (for the first argument only) or ValidArgsFunction for
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// any argument (can include the first one also).
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//
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// Deprecated
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func (c *Command) MarkZshCompPositionalArgumentWords(argPosition int, words ...string) error {
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return nil
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}
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func (c *Command) genZshCompletionFile(filename string, includeDesc bool) error {
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outFile, err := os.Create(filename)
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if err != nil {
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return err
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}
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defer outFile.Close()
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return c.GenZshCompletion(outFile)
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return c.genZshCompletion(outFile, includeDesc)
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}
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// GenZshCompletion generates a zsh completion file and writes to the passed
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// writer. The completion always run on the root command regardless of the
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// command it was called from.
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func (c *Command) GenZshCompletion(w io.Writer) error {
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tmpl, err := template.New("Main").Funcs(zshCompFuncMap).Parse(zshCompletionText)
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if err != nil {
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return fmt.Errorf("error creating zsh completion template: %v", err)
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}
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return tmpl.Execute(w, c.Root())
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func (c *Command) genZshCompletion(w io.Writer, includeDesc bool) error {
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buf := new(bytes.Buffer)
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genZshComp(buf, c.Name(), includeDesc)
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_, err := buf.WriteTo(w)
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return err
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}
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// MarkZshCompPositionalArgumentFile marks the specified argument (first
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// argument is 1) as completed by file selection. patterns (e.g. "*.txt") are
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// optional - if not provided the completion will search for all files.
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func (c *Command) MarkZshCompPositionalArgumentFile(argPosition int, patterns ...string) error {
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if argPosition < 1 {
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return fmt.Errorf("Invalid argument position (%d)", argPosition)
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func genZshComp(buf *bytes.Buffer, name string, includeDesc bool) {
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compCmd := ShellCompRequestCmd
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if !includeDesc {
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compCmd = ShellCompNoDescRequestCmd
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}
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annotation, err := c.zshCompGetArgsAnnotations()
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if err != nil {
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return err
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}
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if c.zshcompArgsAnnotationnIsDuplicatePosition(annotation, argPosition) {
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return fmt.Errorf("Duplicate annotation for positional argument at index %d", argPosition)
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}
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annotation[argPosition] = zshCompArgHint{
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Tipe: zshCompArgumentFilenameComp,
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Options: patterns,
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}
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return c.zshCompSetArgsAnnotations(annotation)
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buf.WriteString(fmt.Sprintf(`#compdef _%[1]s %[1]s
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# zsh completion for %-36[1]s -*- shell-script -*-
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__%[1]s_debug()
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{
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local file="$BASH_COMP_DEBUG_FILE"
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if [[ -n ${file} ]]; then
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echo "$*" >> "${file}"
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fi
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}
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// MarkZshCompPositionalArgumentWords marks the specified positional argument
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// (first argument is 1) as completed by the provided words. At east one word
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// must be provided, spaces within words will be offered completion with
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// "word\ word".
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func (c *Command) MarkZshCompPositionalArgumentWords(argPosition int, words ...string) error {
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if argPosition < 1 {
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return fmt.Errorf("Invalid argument position (%d)", argPosition)
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}
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if len(words) == 0 {
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return fmt.Errorf("Trying to set empty word list for positional argument %d", argPosition)
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}
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annotation, err := c.zshCompGetArgsAnnotations()
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if err != nil {
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return err
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}
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if c.zshcompArgsAnnotationnIsDuplicatePosition(annotation, argPosition) {
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return fmt.Errorf("Duplicate annotation for positional argument at index %d", argPosition)
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}
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annotation[argPosition] = zshCompArgHint{
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Tipe: zshCompArgumentWordComp,
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Options: words,
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}
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return c.zshCompSetArgsAnnotations(annotation)
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_%[1]s()
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{
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local shellCompDirectiveError=%[3]d
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local shellCompDirectiveNoSpace=%[4]d
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local shellCompDirectiveNoFileComp=%[5]d
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local shellCompDirectiveFilterFileExt=%[6]d
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local shellCompDirectiveFilterDirs=%[7]d
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local lastParam lastChar flagPrefix requestComp out directive compCount comp lastComp
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local -a completions
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__%[1]s_debug "\n========= starting completion logic =========="
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__%[1]s_debug "CURRENT: ${CURRENT}, words[*]: ${words[*]}"
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# The user could have moved the cursor backwards on the command-line.
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# We need to trigger completion from the $CURRENT location, so we need
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# to truncate the command-line ($words) up to the $CURRENT location.
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# (We cannot use $CURSOR as its value does not work when a command is an alias.)
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words=("${=words[1,CURRENT]}")
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__%[1]s_debug "Truncated words[*]: ${words[*]},"
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lastParam=${words[-1]}
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lastChar=${lastParam[-1]}
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__%[1]s_debug "lastParam: ${lastParam}, lastChar: ${lastChar}"
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# For zsh, when completing a flag with an = (e.g., %[1]s -n=<TAB>)
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# completions must be prefixed with the flag
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setopt local_options BASH_REMATCH
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if [[ "${lastParam}" =~ '-.*=' ]]; then
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# We are dealing with a flag with an =
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flagPrefix="-P ${BASH_REMATCH}"
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fi
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# Prepare the command to obtain completions
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requestComp="${words[1]} %[2]s ${words[2,-1]}"
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if [ "${lastChar}" = "" ]; then
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# If the last parameter is complete (there is a space following it)
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# We add an extra empty parameter so we can indicate this to the go completion code.
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__%[1]s_debug "Adding extra empty parameter"
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requestComp="${requestComp} \"\""
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fi
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__%[1]s_debug "About to call: eval ${requestComp}"
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# Use eval to handle any environment variables and such
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out=$(eval ${requestComp} 2>/dev/null)
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__%[1]s_debug "completion output: ${out}"
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# Extract the directive integer following a : from the last line
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local lastLine
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while IFS='\n' read -r line; do
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lastLine=${line}
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done < <(printf "%%s\n" "${out[@]}")
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__%[1]s_debug "last line: ${lastLine}"
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if [ "${lastLine[1]}" = : ]; then
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directive=${lastLine[2,-1]}
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# Remove the directive including the : and the newline
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local suffix
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(( suffix=${#lastLine}+2))
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out=${out[1,-$suffix]}
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else
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# There is no directive specified. Leave $out as is.
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__%[1]s_debug "No directive found. Setting do default"
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directive=0
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fi
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__%[1]s_debug "directive: ${directive}"
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__%[1]s_debug "completions: ${out}"
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__%[1]s_debug "flagPrefix: ${flagPrefix}"
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||||
|
||||
if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then
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||||
__%[1]s_debug "Completion received error. Ignoring completions."
|
||||
return
|
||||
fi
|
||||
|
||||
compCount=0
|
||||
while IFS='\n' read -r comp; do
|
||||
if [ -n "$comp" ]; then
|
||||
# If requested, completions are returned with a description.
|
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# The description is preceded by a TAB character.
|
||||
# For zsh's _describe, we need to use a : instead of a TAB.
|
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# We first need to escape any : as part of the completion itself.
|
||||
comp=${comp//:/\\:}
|
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|
||||
local tab=$(printf '\t')
|
||||
comp=${comp//$tab/:}
|
||||
|
||||
((compCount++))
|
||||
__%[1]s_debug "Adding completion: ${comp}"
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||||
completions+=${comp}
|
||||
lastComp=$comp
|
||||
fi
|
||||
done < <(printf "%%s\n" "${out[@]}")
|
||||
|
||||
if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then
|
||||
# File extension filtering
|
||||
local filteringCmd
|
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filteringCmd='_files'
|
||||
for filter in ${completions[@]}; do
|
||||
if [ ${filter[1]} != '*' ]; then
|
||||
# zsh requires a glob pattern to do file filtering
|
||||
filter="\*.$filter"
|
||||
fi
|
||||
filteringCmd+=" -g $filter"
|
||||
done
|
||||
filteringCmd+=" ${flagPrefix}"
|
||||
|
||||
__%[1]s_debug "File filtering command: $filteringCmd"
|
||||
_arguments '*:filename:'"$filteringCmd"
|
||||
elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then
|
||||
# File completion for directories only
|
||||
local subDir
|
||||
subdir="${completions[1]}"
|
||||
if [ -n "$subdir" ]; then
|
||||
__%[1]s_debug "Listing directories in $subdir"
|
||||
pushd "${subdir}" >/dev/null 2>&1
|
||||
else
|
||||
__%[1]s_debug "Listing directories in ."
|
||||
fi
|
||||
|
||||
_arguments '*:dirname:_files -/'" ${flagPrefix}"
|
||||
if [ -n "$subdir" ]; then
|
||||
popd >/dev/null 2>&1
|
||||
fi
|
||||
elif [ $((directive & shellCompDirectiveNoSpace)) -ne 0 ] && [ ${compCount} -eq 1 ]; then
|
||||
__%[1]s_debug "Activating nospace."
|
||||
# We can use compadd here as there is no description when
|
||||
# there is only one completion.
|
||||
compadd -S '' "${lastComp}"
|
||||
elif [ ${compCount} -eq 0 ]; then
|
||||
if [ $((directive & shellCompDirectiveNoFileComp)) -ne 0 ]; then
|
||||
__%[1]s_debug "deactivating file completion"
|
||||
else
|
||||
# Perform file completion
|
||||
__%[1]s_debug "activating file completion"
|
||||
_arguments '*:filename:_files'" ${flagPrefix}"
|
||||
fi
|
||||
else
|
||||
_describe "completions" completions $(echo $flagPrefix)
|
||||
fi
|
||||
}
|
||||
|
||||
func zshCompExtractArgumentCompletionHintsForRendering(c *Command) ([]string, error) {
|
||||
var result []string
|
||||
annotation, err := c.zshCompGetArgsAnnotations()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
for k, v := range annotation {
|
||||
s, err := zshCompRenderZshCompArgHint(k, v)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
result = append(result, s)
|
||||
}
|
||||
if len(c.ValidArgs) > 0 {
|
||||
if _, positionOneExists := annotation[1]; !positionOneExists {
|
||||
s, err := zshCompRenderZshCompArgHint(1, zshCompArgHint{
|
||||
Tipe: zshCompArgumentWordComp,
|
||||
Options: c.ValidArgs,
|
||||
})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
result = append(result, s)
|
||||
}
|
||||
}
|
||||
sort.Strings(result)
|
||||
return result, nil
|
||||
}
|
||||
|
||||
func zshCompRenderZshCompArgHint(i int, z zshCompArgHint) (string, error) {
|
||||
switch t := z.Tipe; t {
|
||||
case zshCompArgumentFilenameComp:
|
||||
var globs []string
|
||||
for _, g := range z.Options {
|
||||
globs = append(globs, fmt.Sprintf(`-g "%s"`, g))
|
||||
}
|
||||
return fmt.Sprintf(`'%d: :_files %s'`, i, strings.Join(globs, " ")), nil
|
||||
case zshCompArgumentWordComp:
|
||||
var words []string
|
||||
for _, w := range z.Options {
|
||||
words = append(words, fmt.Sprintf("%q", w))
|
||||
}
|
||||
return fmt.Sprintf(`'%d: :(%s)'`, i, strings.Join(words, " ")), nil
|
||||
default:
|
||||
return "", fmt.Errorf("Invalid zsh argument completion annotation: %s", t)
|
||||
}
|
||||
}
|
||||
|
||||
func (c *Command) zshcompArgsAnnotationnIsDuplicatePosition(annotation zshCompArgsAnnotation, position int) bool {
|
||||
_, dup := annotation[position]
|
||||
return dup
|
||||
}
|
||||
|
||||
func (c *Command) zshCompGetArgsAnnotations() (zshCompArgsAnnotation, error) {
|
||||
annotation := make(zshCompArgsAnnotation)
|
||||
annotationString, ok := c.Annotations[zshCompArgumentAnnotation]
|
||||
if !ok {
|
||||
return annotation, nil
|
||||
}
|
||||
err := json.Unmarshal([]byte(annotationString), &annotation)
|
||||
if err != nil {
|
||||
return annotation, fmt.Errorf("Error unmarshaling zsh argument annotation: %v", err)
|
||||
}
|
||||
return annotation, nil
|
||||
}
|
||||
|
||||
func (c *Command) zshCompSetArgsAnnotations(annotation zshCompArgsAnnotation) error {
|
||||
jsn, err := json.Marshal(annotation)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Error marshaling zsh argument annotation: %v", err)
|
||||
}
|
||||
if c.Annotations == nil {
|
||||
c.Annotations = make(map[string]string)
|
||||
}
|
||||
c.Annotations[zshCompArgumentAnnotation] = string(jsn)
|
||||
return nil
|
||||
}
|
||||
|
||||
func zshCompGenFuncName(c *Command) string {
|
||||
if c.HasParent() {
|
||||
return zshCompGenFuncName(c.Parent()) + "_" + c.Name()
|
||||
}
|
||||
return "_" + c.Name()
|
||||
}
|
||||
|
||||
func zshCompExtractFlag(c *Command) []*pflag.Flag {
|
||||
var flags []*pflag.Flag
|
||||
c.LocalFlags().VisitAll(func(f *pflag.Flag) {
|
||||
if !f.Hidden {
|
||||
flags = append(flags, f)
|
||||
}
|
||||
})
|
||||
c.InheritedFlags().VisitAll(func(f *pflag.Flag) {
|
||||
if !f.Hidden {
|
||||
flags = append(flags, f)
|
||||
}
|
||||
})
|
||||
return flags
|
||||
}
|
||||
|
||||
// zshCompGenFlagEntryForArguments returns an entry that matches _arguments
|
||||
// zsh-completion parameters. It's too complicated to generate in a template.
|
||||
func zshCompGenFlagEntryForArguments(f *pflag.Flag) string {
|
||||
if f.Name == "" || f.Shorthand == "" {
|
||||
return zshCompGenFlagEntryForSingleOptionFlag(f)
|
||||
}
|
||||
return zshCompGenFlagEntryForMultiOptionFlag(f)
|
||||
}
|
||||
|
||||
func zshCompGenFlagEntryForSingleOptionFlag(f *pflag.Flag) string {
|
||||
var option, multiMark, extras string
|
||||
|
||||
if zshCompFlagCouldBeSpecifiedMoreThenOnce(f) {
|
||||
multiMark = "*"
|
||||
}
|
||||
|
||||
option = "--" + f.Name
|
||||
if option == "--" {
|
||||
option = "-" + f.Shorthand
|
||||
}
|
||||
extras = zshCompGenFlagEntryExtras(f)
|
||||
|
||||
return fmt.Sprintf(`'%s%s[%s]%s'`, multiMark, option, zshCompQuoteFlagDescription(f.Usage), extras)
|
||||
}
|
||||
|
||||
func zshCompGenFlagEntryForMultiOptionFlag(f *pflag.Flag) string {
|
||||
var options, parenMultiMark, curlyMultiMark, extras string
|
||||
|
||||
if zshCompFlagCouldBeSpecifiedMoreThenOnce(f) {
|
||||
parenMultiMark = "*"
|
||||
curlyMultiMark = "\\*"
|
||||
}
|
||||
|
||||
options = fmt.Sprintf(`'(%s-%s %s--%s)'{%s-%s,%s--%s}`,
|
||||
parenMultiMark, f.Shorthand, parenMultiMark, f.Name, curlyMultiMark, f.Shorthand, curlyMultiMark, f.Name)
|
||||
extras = zshCompGenFlagEntryExtras(f)
|
||||
|
||||
return fmt.Sprintf(`%s'[%s]%s'`, options, zshCompQuoteFlagDescription(f.Usage), extras)
|
||||
}
|
||||
|
||||
func zshCompGenFlagEntryExtras(f *pflag.Flag) string {
|
||||
if f.NoOptDefVal != "" {
|
||||
return ""
|
||||
}
|
||||
|
||||
extras := ":" // allow options for flag (even without assistance)
|
||||
for key, values := range f.Annotations {
|
||||
switch key {
|
||||
case zshCompDirname:
|
||||
extras = fmt.Sprintf(":filename:_files -g %q", values[0])
|
||||
case BashCompFilenameExt:
|
||||
extras = ":filename:_files"
|
||||
for _, pattern := range values {
|
||||
extras = extras + fmt.Sprintf(` -g "%s"`, pattern)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return extras
|
||||
}
|
||||
|
||||
func zshCompFlagCouldBeSpecifiedMoreThenOnce(f *pflag.Flag) bool {
|
||||
return strings.Contains(f.Value.Type(), "Slice") ||
|
||||
strings.Contains(f.Value.Type(), "Array")
|
||||
}
|
||||
|
||||
func zshCompQuoteFlagDescription(s string) string {
|
||||
return strings.Replace(s, "'", `'\''`, -1)
|
||||
`, name, compCmd,
|
||||
ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
|
||||
ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user