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spf13--cobra/zsh_completions.md
Marc Khouzam 2c5a0d300f
Extend Go completions and revamp zsh comp (#1070) (#1070) 
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.
2020-06-29 13:52:14 -06:00

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Generating Zsh Completion For Your cobra.Command

Please refer to Shell Completions for details.

Zsh completions standardization

Cobra 1.1 standardized its zsh completion support to align it with its other shell completions. Although the API was kept backwards-compatible, some small changes in behavior were introduced.

Deprecation summary

See further below for more details on these deprecations.

  • cmd.MarkZshCompPositionalArgumentFile(pos, []string{}) is no longer needed. It is therefore deprecated and silently ignored.
  • cmd.MarkZshCompPositionalArgumentFile(pos, glob[]) is deprecated and silently ignored.
    • Instead use ValidArgsFunction with ShellCompDirectiveFilterFileExt.
  • cmd.MarkZshCompPositionalArgumentWords() is deprecated and silently ignored.
    • Instead use ValidArgsFunction.

Behavioral changes

Noun completion

Old behavior New behavior
No file completion by default (opposite of bash) File completion by default; use ValidArgsFunction with ShellCompDirectiveNoFileComp to turn off file completion on a per-argument basis
cmd.MarkZshCompPositionalArgumentFile(pos, []string{}) used to turn on file completion on a per-argument position basis File completion for all arguments by default; cmd.MarkZshCompPositionalArgumentFile() is deprecated and silently ignored
cmd.MarkZshCompPositionalArgumentFile(pos, glob[]) used to turn on file completion with glob filtering on a per-argument position basis (zsh-specific) cmd.MarkZshCompPositionalArgumentFile() is deprecated and silently ignored; use ValidArgsFunction with ShellCompDirectiveFilterFileExt for file extension filtering (not full glob filtering)
cmd.MarkZshCompPositionalArgumentWords(pos, words[]) used to provide completion choices on a per-argument position basis (zsh-specific) cmd.MarkZshCompPositionalArgumentWords() is deprecated and silently ignored; use ValidArgsFunction to achieve the same behavior

Flag-value completion

Old behavior New behavior
No file completion by default (opposite of bash) File completion by default; use RegisterFlagCompletionFunc() with ShellCompDirectiveNoFileComp to turn off file completion
cmd.MarkFlagFilename(flag, []string{}) and similar used to turn on file completion File completion by default; cmd.MarkFlagFilename(flag, []string{}) no longer needed in this context and silently ignored
cmd.MarkFlagFilename(flag, glob[]) used to turn on file completion with glob filtering (syntax of []string{"*.yaml", "*.yml"} incompatible with bash) Will continue to work, however, support for bash syntax is added and should be used instead so as to work for all shells ([]string{"yaml", "yml"})
cmd.MarkFlagDirname(flag) only completes directories (zsh-specific) Has been added for all shells
Completion of a flag name does not repeat, unless flag is of type *Array or *Slice (not supported by bash) Retained for zsh and added to fish
Completion of a flag name does not provide the = form (unlike bash) Retained for zsh and added to fish

Improvements

  • Custom completion support (ValidArgsFunction and RegisterFlagCompletionFunc())
  • File completion by default if no other completions found
  • Handling of required flags
  • File extension filtering no longer mutually exclusive with bash usage
  • Completion of directory names within another directory
  • Support for = form of flags