Add initial bash completion script

The script can be used to auto-complete commands, image names and
container ids from within a bash prompt.

This partially resolves #336.

contrib/docker.bash

@@ -0,0 +1,434 @@
+#!bash
+
+have docker && {
+__docker_containers()
+{
+	local containers
+	containers="$( docker ps -a -q )"
+	COMPREPLY=( $( compgen -W "$containers" -- "$cur" ) )
+}
+
+__docker_image_repos()
+{
+	local repos
+	repos="$( docker images | awk 'NR>1{print $1}' )"
+	COMPREPLY=( $( compgen -W "$repos" -- "$cur" ) )
+}
+
+__docker_images()
+{
+	local images
+	images="$( docker images | awk 'NR>1{print $1":"$2}' )"
+	COMPREPLY=( $( compgen -W "$images" -- "$cur" ) )
+	__ltrim_colon_completions "$cur"
+}
+
+__docker_image_repos_and_tags()
+{
+	local repos images
+	repos="$( docker images | awk 'NR>1{print $1}' )"
+	images="$( docker images | awk 'NR>1{print $1":"$2}' )"
+	COMPREPLY=( $( compgen -W "$repos $images" -- "$cur" ) )
+	__ltrim_colon_completions "$cur"
+}
+
+__docker_containers_and_images()
+{
+	local containers images
+	containers="$( docker ps -a -q )"
+	images="$( docker images | awk 'NR>1{print $1":"$2}' )"
+	COMPREPLY=( $( compgen -W "$images $containers" -- "$cur" ) )
+	__ltrim_colon_completions "$cur"
+}
+
+_docker_docker()
+{
+	case "$prev" in
+		-H)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-H" -- "$cur" ) )
+			;;
+		*)
+			COMPREPLY=( $( compgen -W "$commands help" -- "$cur" ) )
+			;;
+	esac
+}
+
+_docker_attach()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_build()
+{
+	case "$prev" in
+		-t)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-t -q" -- "$cur" ) )
+			;;
+		*)
+			_filedir
+			;;
+	esac
+}
+
+_docker_commit()
+{
+	case "$prev" in
+		-author|-m|-run)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-author -m -run" -- "$cur" ) )
+			;;
+		*)
+			__docker_containers
+			;;
+	esac
+}
+
+_docker_diff()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_events()
+{
+	COMPREPLY=( $( compgen -W "-since" -- "$cur" ) )
+}
+
+_docker_export()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_help()
+{
+	if [ $cpos -eq $cword ]; then
+		COMPREPLY=( $( compgen -W "$commands" -- "$cur" ) )
+	fi
+}
+
+_docker_history()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_image_repos_and_tags
+	fi
+}
+
+_docker_images()
+{
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-a -notrunc -q -viz" -- "$cur" ) )
+			;;
+		*)
+			local counter=$cpos
+			while [ $counter -le $cword ]; do
+				case "${words[$counter]}" in
+					-*)
+						;;
+					*)
+						break
+						;;
+				esac
+				(( counter++ ))
+			done
+
+			if [ $counter -eq $cword ]; then
+				__docker_image_repos
+			fi
+			;;
+	esac
+}
+
+_docker_import()
+{
+	return
+}
+
+_docker_info()
+{
+	return
+}
+
+_docker_insert()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_image_repos_and_tags
+	fi
+}
+
+_docker_inspect()
+{
+	__docker_containers_and_images
+}
+
+_docker_kill()
+{
+	__docker_containers
+}
+
+_docker_login()
+{
+	COMPREPLY=( $( compgen -W "-e -p -u" -- "$cur" ) )
+}
+
+_docker_logs()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_port()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_ps()
+{
+	COMPREPLY=( $( compgen -W "-a -beforeId -l -n -notrunc -q -s -sinceId" -- "$cur" ) )
+}
+
+_docker_pull()
+{
+	COMPREPLY=( $( compgen -W "-t" -- "$cur" ) )
+}
+
+_docker_push()
+{
+	return
+}
+
+_docker_restart()
+{
+	case "$prev" in
+		-t)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-t" -- "$cur" ) )
+			;;
+		*)
+			__docker_containers
+			;;
+	esac
+}
+
+_docker_rm()
+{
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-v" -- "$cur" ) )
+			;;
+		*)
+			__docker_containers
+			;;
+	esac
+}
+
+_docker_rmi()
+{
+	__docker_image_repos_and_tags
+}
+
+_docker_run()
+{
+	case "$prev" in
+		-cidfile)
+			_filedir
+			;;
+		-volumes-from)
+			__docker_containers
+			;;
+		-a|-c|-dns|-e|-h|-m|-p|-u|-v)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-a -c -cidfile -d -dns -e -entrypoint -h -i -m -n -p -t -u -v -volumes-from" -- "$cur" ) )
+			;;
+		*)
+			case "$cur" in
+				-*)
+					COMPREPLY=( $( compgen -W "-a -notrunc -q -viz" -- "$cur" ) )
+					;;
+				*)
+					local counter=$cpos
+					while [ $counter -le $cword ]; do
+						case "${words[$counter]}" in
+							-a|-c|-cidfile|-dns|-e|-h|-m|-p|-u|-v|-volumes-from)
+								(( counter++ ))
+								;;
+							-*)
+								;;
+							*)
+								break
+								;;
+						esac
+						(( counter++ ))
+					done
+
+					if [ $counter -eq $cword ]; then
+						__docker_image_repos_and_tags
+					fi
+					;;
+			esac
+			;;
+	esac
+}
+
+_docker_search()
+{
+	COMPREPLY=( $( compgen -W "-notrunc" -- "$cur" ) )
+}
+
+_docker_start()
+{
+	__docker_containers
+}
+
+_docker_stop()
+{
+	case "$prev" in
+		-t)
+			return
+			;;
+		*)
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "-t" -- "$cur" ) )
+			;;
+		*)
+			__docker_containers
+			;;
+	esac
+}
+
+_docker_tag()
+{
+	COMPREPLY=( $( compgen -W "-f" -- "$cur" ) )
+}
+
+_docker_top()
+{
+	if [ $cpos -eq $cword ]; then
+		__docker_containers
+	fi
+}
+
+_docker_version()
+{
+	return
+}
+
+_docker_wait()
+{
+	__docker_containers
+}
+
+_docker()
+{
+	local cur prev words cword command="docker" counter=1 word cpos
+	local commands="
+			attach
+			build
+			commit
+			diff
+			events
+			export
+			history
+			images
+			import
+			info
+			insert
+			inspect
+			kill
+			login
+			logs
+			port
+			ps
+			pull
+			push
+			restart
+			rm
+			rmi
+			run
+			search
+			start
+			stop
+			tag
+			top
+			version
+			wait
+		"
+
+	COMPREPLY=()
+	_get_comp_words_by_ref -n : cur prev words cword
+
+	while [ $counter -lt $cword ]; do
+		word="${words[$counter]}"
+		case "$word" in
+			-H)
+				(( counter++ ))
+				;;
+			-*)
+				;;
+			*)
+				command="$word"
+				cpos=$counter
+				(( cpos++ ))
+				break
+				;;
+		esac
+		(( counter++ ))
+	done
+
+	local completions_func=_docker_${command}
+	declare -F $completions_func >/dev/null && $completions_func
+
+	return 0
+}
+
+complete -F _docker docker
+}