Merge pull request #3996 from albers/completion-create

Add bash completion for drivers and their options

contrib/completion/bash/docker-machine.bash

@@ -14,6 +14,16 @@
 #    . ~/.docker-machine-completion.sh
 #
 
+_docker_machine_value_of_option() {
+    local pattern="$1"
+    for (( i=2; i < ${cword}; ++i)); do
+        if [[ ${words[$i]} =~ ^($pattern)$ ]] ; then
+            echo ${words[$i + 1]}
+            break
+        fi
+    done
+}
+
 _docker_machine_active() {
     if [[ "${cur}" == -* ]]; then
         COMPREPLY=($(compgen -W "--help" -- "${cur}"))
@@ -31,8 +41,34 @@ _docker_machine_config() {
 }
 
 _docker_machine_create() {
-    # cheating, b/c there are approximately one zillion options to create
-    COMPREPLY=($(compgen -W "$(docker-machine create --help | grep '^   -' | sed 's/^   //; s/[^a-z0-9-].*$//')" -- "${cur}"))
+    case "${prev}" in
+        --driver|-d)
+            COMPREPLY=($(compgen -W "
+                amazonec2
+                azure
+                digitalocean
+                exoscale
+                generic
+                google
+                hyperv
+                openstack
+                rackspace
+                softlayer
+                virtualbox
+                vmwarefusion
+                vmwarevcloudair
+                vmwarevsphere" -- "${cur}"))
+            return
+            ;;
+    esac
+
+    # driver specific options are only included in help output if --driver is given,
+    # so we have to pass that option when calling docker-machine to harvest options.
+    local driver="$(_docker_machine_value_of_option '--driver|-d')"
+    local parsed_options="$(docker-machine 2>/dev/null create ${driver:+--driver $driver} --help | grep '^   -' | sed 's/^   //; s/[^a-z0-9-].*$//')"
+    if [[ ${cur} == -* ]]; then
+        COMPREPLY=($(compgen -W "${parsed_options} -d --help" -- "${cur}"))
+    fi
 }
 
 _docker_machine_env() {