Add command-specific argument completions

Complete bug IDs, bridges, users, labels where appropriate.

This works in bash and fish. ZSH is not yet supported by Cobra.
In fish, descriptions (the part of a completion after the "\t") are shown
as completion label, and can be searched with Ctrl+S.

Reproduce with

	fish -C 'source misc/fish_completion/git-bug'
	git bug select ^I

(tested with fish version 3.3.1)

Also works with bash, but only for "git-bug" (with the dash)

	bash --rcfile <(echo source misc/bash_completion/git-bug)
	git-bug select ^I

Closes #493

1 files changed, 11 insertions, 0 deletions

diff --git a/commands/ls.go b/commands/ls.go
index db4145d0..909e25a8 100644
--- a/commands/ls.go
+++ b/commands/ls.go
@@ -56,6 +56,7 @@ git bug ls status:open --by creation "foo bar" baz
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runLs(env, options, args)
 		}),
+		ValidArgsFunction: completeLs(env),
 	}
 
 	flags := cmd.Flags()
@@ -63,26 +64,36 @@ git bug ls status:open --by creation "foo bar" baz
 
 	flags.StringSliceVarP(&options.statusQuery, "status", "s", nil,
 		"Filter by status. Valid values are [open,closed]")
+	cmd.RegisterFlagCompletionFunc("status", completeFrom([]string{"open", "closed"}))
 	flags.StringSliceVarP(&options.authorQuery, "author", "a", nil,
 		"Filter by author")
 	flags.StringSliceVarP(&options.metadataQuery, "metadata", "m", nil,
 		"Filter by metadata. Example: github-url=URL")
+	cmd.RegisterFlagCompletionFunc("author", completeUserForQuery(env))
 	flags.StringSliceVarP(&options.participantQuery, "participant", "p", nil,
 		"Filter by participant")
+	cmd.RegisterFlagCompletionFunc("participant", completeUserForQuery(env))
 	flags.StringSliceVarP(&options.actorQuery, "actor", "A", nil,
 		"Filter by actor")
+	cmd.RegisterFlagCompletionFunc("actor", completeUserForQuery(env))
 	flags.StringSliceVarP(&options.labelQuery, "label", "l", nil,
 		"Filter by label")
+	cmd.RegisterFlagCompletionFunc("label", completeLabel(env))
 	flags.StringSliceVarP(&options.titleQuery, "title", "t", nil,
 		"Filter by title")
 	flags.StringSliceVarP(&options.noQuery, "no", "n", nil,
 		"Filter by absence of something. Valid values are [label]")
+	cmd.RegisterFlagCompletionFunc("no", completeLabel(env))
 	flags.StringVarP(&options.sortBy, "by", "b", "creation",
 		"Sort the results by a characteristic. Valid values are [id,creation,edit]")
+	cmd.RegisterFlagCompletionFunc("by", completeFrom([]string{"id", "creation", "edit"}))
 	flags.StringVarP(&options.sortDirection, "direction", "d", "asc",
 		"Select the sorting direction. Valid values are [asc,desc]")
+	cmd.RegisterFlagCompletionFunc("direction", completeFrom([]string{"asc", "desc"}))
 	flags.StringVarP(&options.outputFormat, "format", "f", "default",
 		"Select the output formatting style. Valid values are [default,plain,json,org-mode]")
+	cmd.RegisterFlagCompletionFunc("format",
+		completeFrom([]string{"default", "plain", "json", "org-mode"}))
 
 	return cmd
 }