add keystone bash-completion

Change-Id: I84d3897fc056d411fdaaee301465c72e20a66ff8

keystoneclient/shell.py

@@ -180,9 +180,18 @@ class OpenStackIdentityShell(object):
         self._find_actions(subparsers, actions_module)
         self._find_actions(subparsers, shell_generic)
         self._find_actions(subparsers, self)
+        self._add_bash_completion_subparser(subparsers)
 
         return parser
 
+    def _add_bash_completion_subparser(self, subparsers):
+        subparser = subparsers.add_parser('bash_completion',
+            add_help=False,
+            formatter_class=OpenStackHelpFormatter
+        )
+        self.subcommands['bash_completion'] = subparser
+        subparser.set_defaults(func=self.do_bash_completion)
+
     def _find_actions(self, subparsers, actions_module):
         for attr in (a for a in dir(actions_module) if a.startswith('do_')):
             # I prefer to be hypen-separated instead of underscores.
@@ -232,6 +241,9 @@ class OpenStackIdentityShell(object):
         if args.func == self.do_help:
             self.do_help(args)
             return 0
+        elif args.func == self.do_bash_completion:
+            self.do_bash_completion(args)
+            return 0
 
         #FIXME(usrleon): Here should be restrict for project id same as
         # for username or apikey but for compatibility it is not.
@@ -320,6 +332,22 @@ class OpenStackIdentityShell(object):
         except KeyError:
             return shell_v2_0.CLIENT_CLASS
 
+    def do_bash_completion(self, args):
+        """
+        Prints all of the commands and options to stdout.
+        The keystone.bash_completion script doesn't have to hard code them.
+        """
+        commands = set()
+        options = set()
+        for sc_str, sc in self.subcommands.items():
+            commands.add(sc_str)
+            for option in sc._optionals._option_string_actions.keys():
+                options.add(option)
+
+        commands.remove('bash-completion')
+        commands.remove('bash_completion')
+        print ' '.join(commands | options)
+
     @utils.arg('command', metavar='<subcommand>', nargs='?',
                           help='Display help for <subcommand>')
     def do_help(self, args):

tools/keystone.bash_completion

@@ -0,0 +1,27 @@
+# bash completion for openstack keystone
+
+_keystone_opts="" # lazy init
+_keystone_flags="" # lazy init
+_keystone_opts_exp="" # lazy init
+_keystone()
+{
+	local cur prev kbc
+	COMPREPLY=()
+	cur="${COMP_WORDS[COMP_CWORD]}"
+	prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+	if [ "x$_keystone_opts" == "x" ] ; then
+		kbc="`keystone bash-completion | sed -e "s/ -h / /"`"
+		_keystone_opts="`echo "$kbc" | sed -e "s/--[a-z0-9_-]*//g" -e "s/[ ][ ]*/ /g"`"
+		_keystone_flags="`echo " $kbc" | sed -e "s/ [^-][^-][a-z0-9_-]*//g" -e "s/[ ][ ]*/ /g"`"
+		_keystone_opts_exp="`echo $_keystone_opts | sed -e "s/[ ]/|/g"`"
+	fi
+
+	if [[ " ${COMP_WORDS[@]} " =~ " "($_keystone_opts_exp)" " && "$prev" != "help" ]] ; then
+		COMPREPLY=($(compgen -W "${_keystone_flags}" -- ${cur}))
+	else
+		COMPREPLY=($(compgen -W "${_keystone_opts}" -- ${cur}))
+	fi
+	return 0
+}
+complete -F _keystone keystone