# git.py - git server bridge
#
# Copyright 2008 Scott Chacon <schacon at gmail dot com>
#   also some code (and help) borrowed from durin42
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

'''push and pull from a Git server

This extension lets you communicate (push and pull) with a Git server.
This way you can use Git hosting for your project or collaborate with a
project that is in Git.  A bridger of worlds, this plugin be.

Try hg clone git:// or hg clone git+ssh://

For more information and instructions, see :hg:`help git`
'''

from bisect import insort
import inspect
import os

from mercurial import bundlerepo
from mercurial import commands
from mercurial import demandimport
from mercurial import dirstate
from mercurial import discovery
from mercurial import extensions
from mercurial import help
from mercurial import hg
from mercurial import ignore
from mercurial import localrepo
from mercurial import revset
from mercurial import templatekw
from mercurial import util as hgutil
from mercurial import url
from mercurial.i18n import _

demandimport.ignore.extend([
    'collections',
    ])

import gitrepo, hgrepo
from git_handler import GitHandler

testedwith = '1.9.3 2.0.2 2.1.2 2.2.3 2.8.1'
buglink = 'https://bitbucket.org/durin42/hg-git/issues'

# support for `hg clone git://github.com/defunkt/facebox.git`
# also hg clone git+ssh://git@github.com/schacon/simplegit.git
_gitschemes = ('git', 'git+ssh', 'git+http', 'git+https')
for _scheme in _gitschemes:
    hg.schemes[_scheme] = gitrepo

# support for `hg clone localgitrepo`
_oldlocal = hg.schemes['file']

try:
    urlcls = hgutil.url
except AttributeError:
    class urlcls(object):
        def __init__(self, path):
            self.p = hgutil.drop_scheme('file', path)

        def localpath(self):
            return self.p

def _local(path):
    p = urlcls(path).localpath()
    if (os.path.exists(os.path.join(p, '.git')) and
        not os.path.exists(os.path.join(p, '.hg'))):
        return gitrepo
    # detect a bare repository
    if (os.path.exists(os.path.join(p, 'HEAD')) and
        os.path.exists(os.path.join(p, 'objects')) and
        os.path.exists(os.path.join(p, 'refs')) and
        not os.path.exists(os.path.join(p, '.hg'))):
        return gitrepo
    return _oldlocal(path)

hg.schemes['file'] = _local

hgdefaultdest = hg.defaultdest
def defaultdest(source):
    for scheme in _gitschemes:
        if source.startswith('%s://' % scheme) and source.endswith('.git'):
            source = source[:-4]
            break
    return hgdefaultdest(source)
hg.defaultdest = defaultdest

# defend against tracebacks if we specify -r in 'hg pull'
def safebranchrevs(orig, lrepo, repo, branches, revs):
    revs, co = orig(lrepo, repo, branches, revs)
    if getattr(lrepo, 'changelog', False) and co not in lrepo.changelog:
        co = None
    return revs, co
if getattr(hg, 'addbranchrevs', False):
    extensions.wrapfunction(hg, 'addbranchrevs', safebranchrevs)

def extsetup():
    templatekw.keywords.update({'gitnode': gitnodekw})
    revset.symbols.update({
        'fromgit': revset_fromgit, 'gitnode': revset_gitnode
    })
    helpdir = os.path.join(os.path.dirname(__file__), 'help')
    entry = (['git'], _("Working with Git Repositories"),
        lambda: open(os.path.join(helpdir, 'git.rst')).read())
    # in 1.6 and earler the help table is a tuple
    if getattr(help.helptable, 'extend', None):
        insort(help.helptable, entry)
    else:
        help.helptable = help.helptable + (entry,)

def reposetup(ui, repo):
    if not isinstance(repo, gitrepo.gitrepo):
        klass = hgrepo.generate_repo_subclass(repo.__class__)
        repo.__class__ = klass

def gimport(ui, repo, remote_name=None):
    repo.githandler.import_commits(remote_name)

def gexport(ui, repo):
    repo.githandler.export_commits()

def gclear(ui, repo):
    repo.ui.status(_("clearing out the git cache data\n"))
    repo.githandler.clear()

from mercurial import dirstate
from mercurial import ignore
if (getattr(dirstate, 'rootcache', False) and
    getattr(ignore, 'readpats', False)):
    # only install our dirstate wrapper if it has a hope of working
    import gitdirstate
    extensions.wrapfunction(ignore, 'ignore', gitdirstate.gignore)
    dirstate.dirstate = gitdirstate.gitdirstate

def git_cleanup(ui, repo):
    new_map = []
    for line in repo.opener(GitHandler.mapfile):
        gitsha, hgsha = line.strip().split(' ', 1)
        if hgsha in repo:
            new_map.append('%s %s\n' % (gitsha, hgsha))
    f = repo.opener(GitHandler.mapfile, 'wb')
    map(f.write, new_map)
    ui.status(_('git commit map cleaned\n'))

# drop this when we're 1.6-only, this just backports new behavior
def sortednodetags(orig, *args, **kwargs):
    ret = orig(*args, **kwargs)
    ret.sort()
    return ret
extensions.wrapfunction(localrepo.localrepository, 'nodetags', sortednodetags)

def findcommonoutgoing(orig, repo, other, *args, **kwargs):
    if isinstance(other, gitrepo.gitrepo):
        heads = repo.githandler.get_refs(other.path)[0]
        kw = {}
        kw.update(kwargs)
        for val, k in zip(args,
                ('onlyheads', 'force', 'commoninc', 'portable')):
            kw[k] = val
        force = kw.get('force', False)
        commoninc = kw.get('commoninc', None)
        if commoninc is None:
            commoninc = discovery.findcommonincoming(repo, other,
                heads=heads, force=force)
            kw['commoninc'] = commoninc
        return orig(repo, other, **kw)
    return orig(repo, other, *args, **kwargs)
extensions.wrapfunction(discovery, 'findcommonoutgoing', findcommonoutgoing)

def getremotechanges(orig, ui, repo, other, *args, **opts):
    if isinstance(other, gitrepo.gitrepo):
        if args:
            revs = args[0]
        else:
            revs = opts.get('onlyheads', opts.get('revs'))
        r, c, cleanup = repo.githandler.getremotechanges(other, revs)
        # ugh. This is ugly even by mercurial API compatibility standards
        if 'onlyheads' not in orig.func_code.co_varnames:
            cleanup = None
        return r, c, cleanup
    return orig(ui, repo, other, *args, **opts)
try:
    extensions.wrapfunction(bundlerepo, 'getremotechanges', getremotechanges)
except AttributeError:
    # 1.7+
    pass

def peer(orig, uiorrepo, *args, **opts):
    newpeer = orig(uiorrepo, *args, **opts)
    if isinstance(newpeer, gitrepo.gitrepo):
        if isinstance(uiorrepo, localrepo.localrepository):
            newpeer.localrepo = uiorrepo
    return newpeer
extensions.wrapfunction(hg, 'peer', peer)

def revset_fromgit(repo, subset, x):
    '''``fromgit()``
    Select changesets that originate from Git.
    '''
    args = revset.getargs(x, 0, 0, "fromgit takes no arguments")
    git = GitHandler(repo, repo.ui)
    return [r for r in subset if git.map_git_get(repo[r].hex()) is not None]

def revset_gitnode(repo, subset, x):
    '''``gitnode(hash)``
    Select changesets that originate in the given Git revision.
    '''
    args = revset.getargs(x, 1, 1, "gitnode takes one argument")
    rev = revset.getstring(args[0],
                           "the argument to gitnode() must be a hash")
    git = GitHandler(repo, repo.ui)
    def matches(r):
        gitnode = git.map_git_get(repo[r].hex())
        if gitnode is None:
            return False
        return rev in [gitnode, gitnode[:12]]
    return [r for r in subset if matches(r)]

def gitnodekw(**args):
    """:gitnode: String.  The Git changeset identification hash, as a 40 hexadecimal digit string."""
    node = args['ctx']
    repo = args['repo']
    git = GitHandler(repo, repo.ui)
    gitnode = git.map_git_get(node.hex())
    if gitnode is None:
        gitnode = ''
    return gitnode

cmdtable = {
  "gimport":
        (gimport, [], _('hg gimport')),
  "gexport":
        (gexport, [], _('hg gexport')),
  "gclear":
      (gclear, [], _('Clears out the Git cached data')),
  "git-cleanup": (git_cleanup, [], _(
        "Cleans up git repository after history editing"))
}