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.

Closes #493

commands/bridge_auth_addtoken.go

@@ -41,10 +41,12 @@ func newBridgeAuthAddTokenCommand() *cobra.Command {
 
 	flags.StringVarP(&options.target, "target", "t", "",
 		fmt.Sprintf("The target of the bridge. Valid values are [%s]", strings.Join(bridge.Targets(), ",")))
+	cmd.RegisterFlagCompletionFunc("target", completeFrom(bridge.Targets()))
 	flags.StringVarP(&options.login,
 		"login", "l", "", "The login in the remote bug-tracker")
 	flags.StringVarP(&options.user,
 		"user", "u", "", "The user to add the token to. Default is the current user")
+	cmd.RegisterFlagCompletionFunc("user", completeUser(env))
 
 	return cmd
 }

commands/bridge_auth_rm.go

@@ -16,7 +16,8 @@ func newBridgeAuthRm() *cobra.Command {
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runBridgeAuthRm(env, args)
 		},
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeBridgeAuth(env),
 	}
 
 	return cmd

commands/bridge_auth_show.go

@@ -21,7 +21,8 @@ func newBridgeAuthShow() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runBridgeAuthShow(env, args)
 		}),
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeBridgeAuth(env),
 	}
 
 	return cmd

commands/bridge_configure.go

@@ -97,6 +97,7 @@ git bug bridge configure \
 	flags.StringVarP(&options.name, "name", "n", "", "A distinctive name to identify the bridge")
 	flags.StringVarP(&options.target, "target", "t", "",
 		fmt.Sprintf("The target of the bridge. Valid values are [%s]", strings.Join(bridge.Targets(), ",")))
+	cmd.RegisterFlagCompletionFunc("target", completeFrom(bridge.Targets()))
 	flags.StringVarP(&options.params.URL, "url", "u", "", "The URL of the remote repository")
 	flags.StringVarP(&options.params.BaseURL, "base-url", "b", "", "The base URL of your remote issue tracker")
 	flags.StringVarP(&options.params.Login, "login", "l", "", "The login on your remote issue tracker")

commands/bridge_pull.go

@@ -32,7 +32,8 @@ func newBridgePullCommand() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runBridgePull(env, options, args)
 		}),
-		Args: cobra.MaximumNArgs(1),
+		Args:              cobra.MaximumNArgs(1),
+		ValidArgsFunction: completeBridge(env),
 	}
 
 	flags := cmd.Flags()

commands/bridge_push.go

@@ -23,7 +23,8 @@ func newBridgePushCommand() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runBridgePush(env, args)
 		}),
-		Args: cobra.MaximumNArgs(1),
+		Args:              cobra.MaximumNArgs(1),
+		ValidArgsFunction: completeBridge(env),
 	}
 
 	return cmd

commands/bridge_rm.go

@@ -16,7 +16,8 @@ func newBridgeRm() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runBridgeRm(env, args)
 		}),
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeBridge(env),
 	}
 
 	return cmd

commands/comment.go

@@ -18,6 +18,7 @@ func newCommentCommand() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runComment(env, args)
 		}),
+		ValidArgsFunction: completeBug(env),
 	}
 
 	cmd.AddCommand(newCommentAddCommand())

commands/comment_add.go

@@ -25,6 +25,7 @@ func newCommentAddCommand() *cobra.Command {
 		RunE: closeBackend(env, func(cmd *cobra.Command, args []string) error {
 			return runCommentAdd(env, options, args)
 		}),
+		ValidArgsFunction: completeBug(env),
 	}
 
 	flags := cmd.Flags()