add nova-manage bash completion script

Change-Id: I856349fb0b31f32ec4570c74ebceb3563fa22547

Authors

@@ -58,6 +58,7 @@ Devdeep Singh <devdeep.singh@citrix.com>
 Devendra Modium <dmodium@isi.edu>
 Devin Carlen <devin.carlen@gmail.com>
 Dina Belova <dbelova@mirantis.com>
+Dominik Heidler <dheidler@suse.de>
 Don Dugger <donald.d.dugger@intel.com>
 Donal Lafferty <donal.lafferty@citrix.com>
 Dong-In David Kang <dkang@isi.edu>

bin/nova-manage

@@ -1692,6 +1692,18 @@ def main():
             print "\t%s" % k
         sys.exit(2)
     category = argv.pop(0)
+    if category == "bash-completion":
+        if len(argv) < 1:
+            print " ".join([k for (k, v) in CATEGORIES])
+        else:
+            query_category = argv.pop(0)
+            matches = lazy_match(query_category, CATEGORIES)
+            # instantiate the command group object
+            category, fn = matches[0]
+            command_object = fn()
+            actions = methods_of(command_object)
+            print " ".join([k for (k, v) in actions])
+        sys.exit(0)
     matches = lazy_match(category, CATEGORIES)
     # instantiate the command group object
     category, fn = matches[0]

tools/nova-manage.bash_completion

@@ -0,0 +1,37 @@
+# bash completion for openstack nova-manage
+
+_nova_manage_opts="" # lazy init
+_nova_manage_opts_exp="" # lazy init
+
+# dict hack for bash 3
+_set_nova_manage_subopts () {
+  eval _nova_manage_subopts_"$1"='$2'
+}
+_get_nova_manage_subopts () {
+  eval echo '${_nova_manage_subopts_'"$1"'#_nova_manage_subopts_}'
+}
+
+_nova_manage()
+{
+	local cur prev subopts
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+	if [ "x$_nova_manage_opts" == "x" ] ; then
+		_nova_manage_opts="`nova-manage bash-completion 2>/dev/null`"
+		_nova_manage_opts_exp="`echo $_nova_manage_opts | sed -e "s/\s/|/g"`"
+	fi
+
+	if [[ " `echo $_nova_manage_opts` " =~ " $prev " ]] ; then
+		if [ "x$(_get_nova_manage_subopts "$prev")" == "x" ] ; then
+			subopts="`nova-manage bash-completion $prev 2>/dev/null`"
+			_set_nova_manage_subopts "$prev" "$subopts"
+		fi
+		COMPREPLY=($(compgen -W "$(_get_nova_manage_subopts "$prev")" -- ${cur}))
+	elif [[ ! " ${COMP_WORDS[@]} " =~ " "($_nova_manage_opts_exp)" " ]] ; then
+		COMPREPLY=($(compgen -W "${_nova_manage_opts}" -- ${cur}))
+	fi
+	return 0
+}
+complete -F _nova_manage nova-manage