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#! /usr/bin/python
# -*- python-mode -*-
"""git-cola: The highly caffeinated Git GUI
"""

__copyright__ = """
Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013
David Aguilar <davvid@gmail.com> and contributors

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

"""

import os
import sys
import subprocess
from argparse import ArgumentParser
from os.path import abspath
from os.path import dirname
from os.path import realpath


def setup_environment():
    """Provides access to the cola modules"""
    # Try to detect where it is run from and set prefix and the search path.
    # It is assumed that the user installed Cola using the --prefix= option
    prefix = dirname(dirname(realpath(abspath(__file__))))

    # Look for modules in the source or install trees
    cola_mod = os.path.join(prefix, 'cola', '__init__.py')
    if os.path.exists(cola_mod):
        # Source tree
        sys.path.insert(1, prefix)
    else:
        # Install tree
        install_lib = os.path.join(prefix, 'share', 'git-cola', 'lib')
        sys.path.insert(1, install_lib)
setup_environment()

from cola import core
from cola import cmds
from cola.app import add_common_arguments
from cola.app import application_init
from cola.app import application_start


def main():
    # we're using argparse with subparser, but argparse
    # does not allow us to assign a default subparser
    # when none has been specified.  We fake it by injecting
    # 'cola' into the command-line so that parse_args()
    # routes them to the 'cola' parser by default.
    if (len(sys.argv) < 2 or
            sys.argv[1].startswith('-') and
            sys.argv[1] not in ('-h', '--help')):
        sys.argv.insert(1, 'cola')
    args = parse_args()
    return args.func(args)


def parse_args():
    parser = ArgumentParser()
    subparser = parser.add_subparsers(title='valid commands')

    add_cola_command(subparser)
    add_archive_command(subparser)
    add_branch_command(subparser)
    add_browse_command(subparser)
    add_config_command(subparser)
    add_dag_command(subparser)
    add_diff_command(subparser)
    add_fetch_command(subparser)
    add_grep_command(subparser)
    add_merge_command(subparser)
    add_pull_command(subparser)
    add_push_command(subparser)
    add_rebase_command(subparser)
    add_remote_command(subparser)
    add_search_command(subparser)
    add_stash_command(subparser)
    add_tag_command(subparser)
    add_version_command(subparser)

    return parser.parse_args()


def add_command(parent, name, description, func):
    parser = parent.add_parser(name, help=description)
    parser.set_defaults(func=func)
    add_common_arguments(parser)
    return parser


def add_cola_command(subparser):
    parser = add_command(subparser, 'cola', 'start git-cola', cmd_cola)
    parser.add_argument('--amend', default=False, action='store_true',
                        help='start in amend mode')


def add_archive_command(parent):
    parser = add_command(parent, 'archive', 'save an archive', cmd_archive)
    parser.add_argument('ref', metavar='<ref>', nargs='?', default=None,
                        help='SHA-1 to archive')


def add_branch_command(subparser):
    add_command(subparser, 'branch', 'create a branch', cmd_branch)


def add_browse_command(subparser):
    add_command(subparser, 'browse', 'browse repository', cmd_browse)
    add_command(subparser, 'classic', 'browse repository', cmd_browse)


def add_config_command(subparser):
    add_command(subparser, 'config', 'edit configuration', cmd_config)


def add_dag_command(subparser):
    parser = add_command(subparser, 'dag', 'start git-dag', cmd_dag)
    parser.add_argument('-c', '--count', metavar='<count>',
                        type=int, default=1000,
                        help='number of commits to display')
    parser.add_argument('args', nargs='*', metavar='<args>',
                        help='git log arguments')

def add_diff_command(subparser):
    parser = add_command(subparser, 'diff', 'view diffs', cmd_diff)
    parser.add_argument('args', nargs='*', metavar='<args>',
                        help='git diff arguments')


def add_fetch_command(subparser):
    add_command(subparser, 'fetch', 'fetch remotes', cmd_fetch)


def add_grep_command(subparser):
    parser = add_command(subparser, 'grep', 'grep source', cmd_grep)
    parser.add_argument('args', nargs='*', metavar='<args>',
                        help='git grep arguments')

def add_merge_command(subparser):
    add_command(subparser, 'merge', 'merge branches', cmd_merge)


def add_pull_command(subparser):
    parser = add_command(subparser, 'pull', 'pull remote branches', cmd_pull)
    parser.add_argument('--rebase', default=False, action='store_true',
                        help='rebase local branch when pulling')


def add_push_command(subparser):
    add_command(subparser, 'push', 'push remote branches', cmd_push)


def add_rebase_command(subparser):
    parser = add_command(subparser, 'rebase', 'interactive rebase', cmd_rebase)
    parser.add_argument('branch', metavar='<branch>',
                        help='New upstream branch')


def add_remote_command(subparser):
    add_command(subparser, 'remote', 'edit remotes', cmd_remote)


def add_search_command(subparser):
    add_command(subparser, 'search', 'search commits', cmd_search)


def add_stash_command(subparser):
    add_command(subparser, 'stash', 'stash and unstash changes', cmd_stash)


def add_tag_command(subparser):
    parser = add_command(subparser, 'tag', 'create tags', cmd_tag)
    parser.add_argument('name', metavar='<name>', nargs='?', default=None,
                        help='tag name')
    parser.add_argument('ref', metavar='<ref>', nargs='?', default=None,
                        help='SHA-1 to tag')
    parser.add_argument('-s', '--sign', default=False, action='store_true',
                        help='annotated and GPG-signed tag')

def add_version_command(subparser):
    parser = add_command(subparser, 'version', 'print the version', cmd_version)
    parser.add_argument('--brief', action='store_true', default=False,
                        help='print the version number only')

# entry points

def cmd_cola(args):
    context = application_init(args)
    from cola.widgets.main import MainView
    view = MainView(context.model)
    if args.amend:
        cmds.do(cmds.AmendMode, True)
    return application_start(context, view)


def cmd_archive(args):
    context = application_init(args, update=True)
    if args.ref is None:
        args.ref = context.model.currentbranch

    from cola.widgets.archive import GitArchiveDialog
    view = GitArchiveDialog(args.ref)
    return application_start(context, view)


def cmd_branch(args):
    context = application_init(args, update=True)
    from cola.widgets.createbranch import create_new_branch
    view = create_new_branch()
    return application_start(context, view)


def cmd_browse(args):
    context = application_init(args)
    from cola.widgets.browse import worktree_browser
    view = worktree_browser(update=False)
    return application_start(context, view)


def cmd_config(args):
    context = application_init(args)
    from cola.widgets.prefs import preferences
    view = preferences()
    return application_start(context, view)


def cmd_dag(args):
    context = application_init(args)
    from cola.widgets.dag import git_dag
    view = git_dag(context.model, args=args)
    return application_start(context, view)


def cmd_diff(args):
    context = application_init(args)
    from cola.difftool import diff_expression
    expr = subprocess.list2cmdline(map(core.decode, args.args))
    view = diff_expression(None, expr, create_widget=True)
    return application_start(context, view)


def cmd_fetch(args):
    # TODO: the calls to update_status() can be done asynchronously
    # by hooking into the message_updated notification.
    context = application_init(args)
    from cola.widgets import remote
    context.model.update_status()
    view = remote.fetch()
    return application_start(context, view)


def cmd_grep(args):
    context = application_init(args)
    from cola.widgets import grep
    text = subprocess.list2cmdline(map(core.decode, args.args))
    view = grep.run_grep(text=text, parent=None)
    return application_start(context, view)


def cmd_merge(args):
    context = application_init(args, update=True)
    from cola.widgets.merge import MergeView
    view = MergeView(context.model, parent=None)
    return application_start(context, view)


def cmd_version(args):
    from cola import version
    version.print_version(brief=args.brief)
    return 0


def cmd_pull(args):
    context = application_init(args, update=True)
    from cola.widgets import remote
    view = remote.pull()
    if args.rebase:
        view.set_rebase(True)
    return application_start(context, view)


def cmd_push(args):
    context = application_init(args, update=True)
    from cola.widgets import remote
    view = remote.push()
    return application_start(context, view)


def cmd_rebase(args):
    status, out, err = cmds.do(cmds.Rebase, args.branch)
    if out:
        core.stdout(out)
    if err:
        core.stderr(err)
    return status


def cmd_remote(args):
    context = application_init(args)
    from cola.widgets import editremotes
    view = editremotes.edit()
    return application_start(context, view)


def cmd_search(args):
    context = application_init(args)
    from cola.widgets.search import search
    view = search()
    return application_start(context, view)


def cmd_stash(args):
    context = application_init(args)
    from cola.widgets.stash import stash
    view = stash()
    return application_start(context, view)


def cmd_tag(args):
    context = application_init(args)
    from cola.widgets.createtag import create_tag
    view = create_tag(name=args.name, ref=args.ref, sign=args.sign)
    return application_start(context, view)


if __name__ == '__main__':
    sys.exit(main())