Add bash completion for available plugins

Signed-off-by: CrazyMax <github@crazymax.dev>
(cherry picked from commit aa0aa4a)

contrib/completion/bash/docker

@@ -1184,6 +1184,29 @@ __docker_complete_user_group() {
 	fi
 }
 
+DOCKER_PLUGINS_PATH=$(docker info --format '{{range .ClientInfo.Plugins}}{{.Path}}:{{end}}')
+
+__docker_complete_plugin() {
+	local path=$1
+	local completionCommand="__completeNoDesc"
+	local resultArray=($path $completionCommand)
+	for value in "${words[@]:2}"; do
+		if [ -z "$value" ]; then
+			resultArray+=( "''" )
+		else
+			resultArray+=( "$value" )
+		fi
+	done
+	local result=$(eval "${resultArray[*]}" 2> /dev/null | grep -v '^:[0-9]*$')
+
+	# if result empty, just use filename completion as fallback
+	if [ -z "$result" ]; then
+		_filedir
+	else
+		COMPREPLY=( $(compgen -W "${result}" -- "${current-}") )
+	fi
+}
+
 _docker_docker() {
 	# global options that may appear after the docker command
 	local boolean_options="
@@ -5477,23 +5500,6 @@ _docker_wait() {
 	_docker_container_wait
 }
 
-COMPOSE_PLUGIN_PATH=$(docker info --format '{{range .ClientInfo.Plugins}}{{if eq .Name "compose"}}{{.Path}}{{end}}{{end}}')
-
-_docker_compose() {
-	local completionCommand="__completeNoDesc"
-	local resultArray=($COMPOSE_PLUGIN_PATH $completionCommand compose)
-	for value in "${words[@]:2}"; do
-		if [ -z "$value" ]; then
-			resultArray+=( "''" )
-		else
-			resultArray+=( "$value" )
-		fi
-	done
-	local result=$(eval "${resultArray[*]}" 2> /dev/null | grep -v '^:[0-9]*$')
-
-	COMPREPLY=( $(compgen -W "${result}" -- "$current") )
-}
-
 _docker() {
 	local previous_extglob_setting=$(shopt -p extglob)
 	shopt -s extglob
@@ -5563,11 +5569,16 @@ _docker() {
 		wait
 	)
 
+	# Create completion functions for all registered plugins
 	local known_plugin_commands=()
-
-	if [ -f "$COMPOSE_PLUGIN_PATH" ] ; then
-		known_plugin_commands+=("compose")
-	fi
+	local plugin_name=""
+	for plugin_path in ${DOCKER_PLUGINS_PATH//:/ }; do
+		plugin_name=$(basename "$plugin_path" | sed 's/ *$//')
+		plugin_name=${plugin_name#docker-}
+		plugin_name=${plugin_name%%.*}
+		eval "_docker_${plugin_name}() { __docker_complete_plugin \"${plugin_path}\"; }"
+		known_plugin_commands+=(${plugin_name})
+	done
 
 	local experimental_server_commands=(
 		checkpoint