Move bash completion logic to new subcommand: build

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

contrib/completion/bash/docker

@@ -825,71 +825,7 @@ _docker_attach() {
 }
 
 _docker_build() {
-	local options_with_args="
-		--build-arg
-		--cgroup-parent
-		--cpuset-cpus
-		--cpuset-mems
-		--cpu-shares -c
-		--cpu-period
-		--cpu-quota
-		--file -f
-		--isolation
-		--label
-		--memory -m
-		--memory-swap
-		--shm-size
-		--tag -t
-		--ulimit
-	"
-
-	local boolean_options="
-		--compress
-		--disable-content-trust=false
-		--force-rm
-		--help
-		--no-cache
-		--pull
-		--quiet -q
-		--rm
-	"
-
-	local all_options="$options_with_args $boolean_options"
-
-	case "$prev" in
-		--build-arg)
-			COMPREPLY=( $( compgen -e -- "$cur" ) )
-			__docker_nospace
-			return
-			;;
-		--file|-f)
-			_filedir
-			return
-			;;
-		--isolation)
-			__docker_complete_isolation
-			return
-			;;
-		--tag|-t)
-			__docker_complete_image_repos_and_tags
-			return
-			;;
-		$(__docker_to_extglob "$options_with_args") )
-			return
-			;;
-	esac
-
-	case "$cur" in
-		-*)
-			COMPREPLY=( $( compgen -W "$all_options" -- "$cur" ) )
-			;;
-		*)
-			local counter=$( __docker_pos_first_nonflag $( __docker_to_alternatives "$options_with_args" ) )
-			if [ $cword -eq $counter ]; then
-				_filedir -d
-			fi
-			;;
-	esac
+	_docker_image_build
 }
 
 
@@ -2063,7 +1999,71 @@ _docker_image() {
 }
 
 _docker_image_build() {
-	_docker_build
+	local options_with_args="
+		--build-arg
+		--cgroup-parent
+		--cpuset-cpus
+		--cpuset-mems
+		--cpu-shares -c
+		--cpu-period
+		--cpu-quota
+		--file -f
+		--isolation
+		--label
+		--memory -m
+		--memory-swap
+		--shm-size
+		--tag -t
+		--ulimit
+	"
+
+	local boolean_options="
+		--compress
+		--disable-content-trust=false
+		--force-rm
+		--help
+		--no-cache
+		--pull
+		--quiet -q
+		--rm
+	"
+
+	local all_options="$options_with_args $boolean_options"
+
+	case "$prev" in
+		--build-arg)
+			COMPREPLY=( $( compgen -e -- "$cur" ) )
+			__docker_nospace
+			return
+			;;
+		--file|-f)
+			_filedir
+			return
+			;;
+		--isolation)
+			__docker_complete_isolation
+			return
+			;;
+		--tag|-t)
+			__docker_complete_image_repos_and_tags
+			return
+			;;
+		$(__docker_to_extglob "$options_with_args") )
+			return
+			;;
+	esac
+
+	case "$cur" in
+		-*)
+			COMPREPLY=( $( compgen -W "$all_options" -- "$cur" ) )
+			;;
+		*)
+			local counter=$( __docker_pos_first_nonflag $( __docker_to_alternatives "$options_with_args" ) )
+			if [ $cword -eq $counter ]; then
+				_filedir -d
+			fi
+			;;
+	esac
 }
 
 _docker_image_history() {