add auto-completion stuff

setup.py

@@ -22,6 +22,13 @@
 vcstool enables batch commands on multiple different vcs repositories. \
 Currently it supports git, hg, svn and bzr.''',
     license='BSD',
+    data_files=[
+        ('share/vcstool-completion', [
+            'vcstool-completion/vcs.bash',
+            'vcstool-completion/vcs.tcsh',
+            'vcstool-completion/vcs.zsh'
+        ])
+    ],
     entry_points={
         'console_scripts': [
             'vcs = vcstool.commands.vcs:main',

vcstool-completion/vcs.bash

@@ -0,0 +1,12 @@
+function _vcs()
+{
+    local cur
+    COMPREPLY=()
+    cur=${COMP_WORDS[COMP_CWORD]}
+
+    if [ $COMP_CWORD -eq 1 ]; then
+        COMPREPLY=( $( compgen -W "`vcs --commands`" -- $cur ))
+    fi
+}
+
+complete -o dirnames -F _vcs vcs

vcstool-completion/vcs.tcsh

@@ -0,0 +1 @@
+complete vcs 'p/1/`vcs --commands`/' 'C/*/d/'

vcstool-completion/vcs.zsh

@@ -0,0 +1,12 @@
+function _vcs()
+{
+    local opts
+    reply=()
+
+    if [[ ${CURRENT} == 2 ]]; then
+        opts=`vcs --commands`
+        reply=(${=opts})
+    fi
+}
+
+compctl -K "_vcs" "vcs"

vcstool/commands/help.py

@@ -31,6 +31,10 @@ def main(args=None):
             print('  %s' % client.type)
         return 0
 
+    if ns.commands:
+        print(' '.join([cmd.command for cmd in vcstool_commands]))
+        return 0
+
     # output detailed command list
     parser = get_parser_with_command_only()
     parser.print_help()
@@ -42,6 +46,7 @@ def get_parser(add_help=True):
     group = parser.add_mutually_exclusive_group()
     group.add_argument('command', metavar='<command>', nargs='?', help='The available commands: %s' % ', '.join([cmd.command for cmd in vcstool_commands]))
     group.add_argument('--clients', action='store_true', default=False, help='Show the available VCS clients')
+    group.add_argument('--commands', action='store_true', default=False, help='Output the available commands for auto-completion')
     from vcstool import __version__
     group.add_argument('--version', action='version', version='%(prog)s ' + __version__, help='Show the vcstool version')
     return parser