# Copyright 2009, Alexander Solovyov <piranha@piranha.org.ua>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""extend schemes with shortcuts to repository swarms

This extension allows you to specify shortcuts for parent URLs with a

lot of repositories to act like a scheme, for example::

  [schemes]

  py = http://code.python.org/hg/

After that you can use it like::

  hg clone py://trunk/

Additionally there is support for some more complex schemas, for

example used by Google Code::

  [schemes]

  gcode = http://{1}.googlecode.com/hg/

The syntax is taken from Mercurial templates, and you have unlimited

number of variables, starting with ``{1}`` and continuing with

``{2}``, ``{3}`` and so on. This variables will receive parts of URL

supplied, split by ``/``. Anything not specified as ``{part}`` will be

just appended to an URL.

For convenience, the extension adds these schemes by default::

  [schemes]

  py = http://hg.python.org/

  bb = https://bitbucket.org/

  bb+ssh = ssh://hg@bitbucket.org/

  gcode = https://{1}.googlecode.com/hg/

  kiln = https://{1}.kilnhg.com/Repo/

You can override a predefined scheme by defining a new scheme with the

same name.

"""

from __future__ import absolute_import

import os

import re

from mercurial.i18n import _

from mercurial import (

    cmdutil,

    error,

    extensions,

    hg,

    templater,

    util,

)

cmdtable = {}

command = cmdutil.command(cmdtable)

# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should

# be specifying the version(s) of Mercurial they are tested with, or

# leave the attribute unspecified.

class ShortRepository(object):

    def __init__(self, url, scheme, templater):

        self.scheme = scheme

        self.templater = templater

        self.url = url

        try:

            self.parts = max(map(int, re.findall(r'\{(\d+)\}', self.url)))

        except ValueError:

            self.parts = 0

    def __repr__(self):

        return '<ShortRepository: %s>' % self.scheme

    def instance(self, ui, url, create):

        url = self.resolve(url)

        return hg._peerlookup(url).instance(ui, url, create)

    def resolve(self, url):

        # Should this use the util.url class, or is manual parsing better?

        try:

            url = url.split('://', 1)[1]

        except IndexError:

            raise error.Abort(_("no '://' in scheme url '%s'") % url)

        parts = url.split('/', self.parts)

        if len(parts) > self.parts:

            tail = parts[-1]

            parts = parts[:-1]

        else:

            tail = ''

        context = dict((str(i + 1), v) for i, v in enumerate(parts))

        return ''.join(self.templater.process(self.url, context)) + tail

def hasdriveletter(orig, path):

    if path:

        for scheme in schemes:

            if path.startswith(scheme + ':'):

                return False

    return orig(path)

schemes = {

    'py': 'http://hg.python.org/',

    'bb': 'https://bitbucket.org/',

    'bb+ssh': 'ssh://hg@bitbucket.org/',

    'gcode': 'https://{1}.googlecode.com/hg/',

    'kiln': 'https://{1}.kilnhg.com/Repo/'

    }

def extsetup(ui):

    schemes.update(dict(ui.configitems('schemes')))

    t = templater.engine(lambda x: x)

    for scheme, url in schemes.items():

        if (os.name == 'nt' and len(scheme) == 1 and scheme.isalpha()

            and os.path.exists('%s:\\' % scheme)):

            raise error.Abort(_('custom scheme %s:// conflicts with drive '

                               'letter %s:\\\n') % (scheme, scheme.upper()))

        hg.schemes[scheme] = ShortRepository(url, scheme, t)

    extensions.wrapfunction(util, 'hasdriveletter', hasdriveletter)

@command('debugexpandscheme', norepo=True)

def expandscheme(ui, url, **opts):

    """given a repo path, provide the scheme-expanded path

    """

    repo = hg._peerlookup(url)

    if isinstance(repo, ShortRepository):

        url = repo.resolve(url)

    ui.write(url + '\n')