Add bash completions for daemon flags, simplify with extglob

Implementing the deamon flags the traditional way introduced even more
redundancy than usual because the same list of options with flags
had to be added twice.

This can be avoided by using variables in the case statements when
using the extglob shell option.

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

contrib/completion/bash/docker

@@ -104,6 +104,22 @@ __docker_pos_first_nonflag() {
 	echo $counter
 }
 
+# Transforms a multiline list of strings into a single line string
+# with the words separated by "|".
+# This is used to prepare arguments to __docker_pos_first_nonflag().
+__docker_to_alternatives() {
+	local parts=( $1 )
+	local IFS='|'
+	echo "${parts[*]}"
+}
+
+# Transforms a multiline list of options into an extglob pattern
+# suitable for use in case statements.
+__docker_to_extglob() {
+	local extglob=$( __docker_to_alternatives "$1" )
+	echo "@($extglob)"
+}
+
 __docker_resolve_hostname() {
 	command -v host >/dev/null 2>&1 || return
 	COMPREPLY=( $(host 2>/dev/null "${cur%:}" | awk '/has address/ {print $4}') )
@@ -154,15 +170,47 @@ __docker_capabilities() {
 }
 
 _docker_docker() {
+	local boolean_options="
+		--api-enable-cors
+		--daemon -d
+		--debug -D
+		--help -h
+		--icc
+		--ip-forward
+		--ip-masq
+		--iptables
+		--ipv6
+		--selinux-enabled
+		--tls
+		--tlsverify
+		--version -v
+	"
+
 	case "$prev" in
-		-H)
+		--graph|-g)
+			_filedir -d
+			return
+			;;
+		--log-level|-l)
+			COMPREPLY=( $( compgen -W "debug info warn error fatal" -- "$cur" ) )
+			return
+			;;
+		--pidfile|-p|--tlscacert|--tlscert|--tlskey)
+			_filedir
+			return
+			;;
+		--storage-driver|-s)
+			COMPREPLY=( $( compgen -W "aufs devicemapper btrfs overlay" -- "$(echo $cur | tr '[:upper:]' '[:lower:]')" ) )
+			return
+			;;
+		$main_options_with_args_glob )
 			return
 			;;
 	esac
 
 	case "$cur" in
 		-*)
-			COMPREPLY=( $( compgen -W "-H" -- "$cur" ) )
+			COMPREPLY=( $( compgen -W "$boolean_options $main_options_with_args" -- "$cur" ) )
 			;;
 		*)
 			COMPREPLY=( $( compgen -W "${commands[*]} help" -- "$cur" ) )
@@ -561,6 +609,8 @@ _docker_run() {
 		--sig-proxy
 	"
 
+	local options_with_args_glob=$(__docker_to_extglob "$options_with_args")
+
 	case "$prev" in
 		--add-host)
 			case "$cur" in
@@ -677,7 +727,7 @@ _docker_run() {
 			__docker_containers_all
 			return
 			;;
-		--cpuset|--cpu-shares|-c|--dns|--dns-search|--entrypoint|--expose|--hostname|-h|--lxc-conf|--mac-address|--memory|-m|--name|-n|--publish|-p|--user|-u|--workdir|-w)
+		$options_with_args_glob )
 			return
 			;;
 	esac
@@ -687,7 +737,7 @@ _docker_run() {
 			COMPREPLY=( $( compgen -W "$all_options" -- "$cur" ) )
 			;;
 		*)
-			local counter=$( __docker_pos_first_nonflag $( echo $options_with_args | tr -d "\n" | tr " " "|" ) )
+			local counter=$( __docker_pos_first_nonflag $( __docker_to_alternatives "$options_with_args" ) )
 
 			if [ $cword -eq $counter ]; then
 				__docker_image_repos_and_tags_and_ids
@@ -801,6 +851,9 @@ _docker_wait() {
 }
 
 _docker() {
+	local previous_extglob_setting=$(shopt -p extglob)
+	shopt -s extglob
+
 	local commands=(
 		attach
 		build
@@ -841,6 +894,33 @@ _docker() {
 		wait
 	)
 
+	local main_options_with_args="
+		--bip
+		--bridge -b
+		--dns
+		--dns-search
+		--exec-driver -e
+		--fixed-cidr
+		--fixed-cidr-v6
+		--graph -g
+		--group -G
+		--host -H
+		--insecure-registry
+		--ip
+		--label
+		--log-level -l
+		--mtu
+		--pidfile -p
+		--registry-mirror
+		--storage-driver -s
+		--storage-opt
+		--tlscacert
+		--tlscert
+		--tlskey
+	"
+
+	local main_options_with_args_glob=$(__docker_to_extglob "$main_options_with_args")
+
 	COMPREPLY=()
 	local cur prev words cword
 	_get_comp_words_by_ref -n : cur prev words cword
@@ -849,7 +929,7 @@ _docker() {
 	local counter=1
 	while [ $counter -lt $cword ]; do
 		case "${words[$counter]}" in
-			-H)
+			$main_options_with_args_glob )
 				(( counter++ ))
 				;;
 			-*)
@@ -867,6 +947,7 @@ _docker() {
 	local completions_func=_docker_${command}
 	declare -F $completions_func >/dev/null && $completions_func
 
+	eval "$previous_extglob_setting"
 	return 0
 }