# 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 (

    error,

    extensions,

    hg,

    pycompat,

    registrar,

    templater,

    util,

)

cmdtable = {}

command = registrar.command(cmdtable)

# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for

# 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.

testedwith = b'ships-with-hg-core'

_partre = re.compile(br'\{(\d+)\}')

class ShortRepository(object):

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

        self.scheme = scheme

        self.templater = templater

        self.url = url

        try:

            self.parts = max(map(int, _partre.findall(self.url)))

        except ValueError:

            self.parts = 0

    def __repr__(self):

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

    def instance(self, ui, url, create, intents=None, createopts=None):

        url = self.resolve(url)

        return hg._peerlookup(url).instance(

            ui, url, create, intents=intents, createopts=createopts

        )

    def resolve(self, url):

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

        try:

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

        except IndexError:

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

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

        if len(parts) > self.parts:

            tail = parts[-1]

            parts = parts[:-1]

        else:

            tail = b''

        context = dict((b'%d' % (i + 1), v) for i, v in enumerate(parts))

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

def hasdriveletter(orig, path):

    if path:

        for scheme in schemes:

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

                return False

    return orig(path)

schemes = {

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

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

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

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

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

}

def extsetup(ui):

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

    t = templater.engine(templater.parse)

    for scheme, url in schemes.items():

        if (

            pycompat.iswindows

            and len(scheme) == 1

            and scheme.isalpha()

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

        ):

            raise error.Abort(

                _(

                    b'custom scheme %s:// conflicts with drive '

                    b'letter %s:\\\n'

                )

                % (scheme, scheme.upper())

            )

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

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

@command(b'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 + b'\n')