Add bash completion for `secret ls --format`

Signed-off-by: Harald Albers <github@albersweb.de>

contrib/completion/bash/docker

@@ -328,20 +328,40 @@ __docker_complete_runtimes() {
 	COMPREPLY=( $(compgen -W "$(__docker_runtimes)" -- "$cur") )
 }
 
-# __docker_secrets returns a list of all secrets.
-# By default, only names of secrets are returned.
-# Set DOCKER_COMPLETION_SHOW_SECRET_IDS=yes to also complete IDs of secrets.
+# __docker_secrets returns a list of secrets. Additional options to
+# `docker secret ls` may be specified in order to filter the list, e.g.
+# `__docker_secrets --filter label=stage=production`
+# By default, only names are returned.
+# Set DOCKER_COMPLETION_SHOW_SECRET_IDS=yes to also complete IDs.
+# An optional first option `--id|--name` may be used to limit the
+# output to the IDs or names of matching items. This setting takes
+# precedence over the environment setting.
 __docker_secrets() {
-	local fields='$2'  # default: name only
-	[ "${DOCKER_COMPLETION_SHOW_SECRET_IDS}" = yes ] && fields='$1,$2' # ID and name
+	local format
+	if [ "$1" = "--id" ] ; then
+		format='{{.ID}}'
+		shift
+	elif [ "$1" = "--name" ] ; then
+		format='{{.Name}}'
+		shift
+	elif [ "$DOCKER_COMPLETION_SHOW_SECRET_IDS" = yes ] ; then
+		format='{{.ID}} {{.Name}}'
+	else
+		format='{{.Name}}'
+	fi
 
-	__docker_q secret ls | awk "NR>1 {print $fields}"
+	__docker_q secret ls --format "$format" "$@"
 }
 
 # __docker_complete_secrets applies completion of secrets based on the current value
-# of `$cur`.
+# of `$cur` or the value of the optional first option `--cur`, if given.
 __docker_complete_secrets() {
-	COMPREPLY=( $(compgen -W "$(__docker_secrets)" -- "$cur") )
+	local current="$cur"
+	if [ "$1" = "--cur" ] ; then
+		current="$2"
+		shift 2
+	fi
+	COMPREPLY=( $(compgen -W "$(__docker_secrets "$@")" -- "$current") )
 }
 
 # __docker_stacks returns a list of all stacks.
@@ -3854,7 +3874,24 @@ _docker_secret_list() {
 }
 
 _docker_secret_ls() {
+	local key=$(__docker_map_key_of_current_option '--filter|-f')
+	case "$key" in
+		id)
+			__docker_complete_secrets --cur "${cur##*=}" --id
+			return
+			;;
+		name)
+			__docker_complete_secrets --cur "${cur##*=}" --name
+			return
+			;;
+	esac
+
 	case "$prev" in
+		--filter|-f)
+			COMPREPLY=( $( compgen -S = -W "id label name" -- "$cur" ) )
+			__docker_nospace
+			return
+			;;
 		--format)
 			return
 			;;
@@ -3862,7 +3899,7 @@ _docker_secret_ls() {
 
 	case "$cur" in
 		-*)
-			COMPREPLY=( $( compgen -W "--format --help --quiet -q" -- "$cur" ) )
+			COMPREPLY=( $( compgen -W "--format --filter -f --help --quiet -q" -- "$cur" ) )
 			;;
 	esac
 }