# 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`
'''

# global modules
import os

# local modules
import gitrepo
import hgrepo
import overlay
import verify
import util

from bisect import insort
from git_handler import GitHandler
from mercurial import bundlerepo
from mercurial import cmdutil
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 localrepo
from mercurial import manifest
from mercurial import revset
from mercurial import scmutil
from mercurial import templatekw
from mercurial import ui as hgui
from mercurial import util as hgutil
from mercurial.node import hex
from mercurial.i18n import _

try:
    from mercurial import exchange
    exchange.push  # existed in first iteration of this file
except ImportError:
    # We only *use* the exchange module in hg 3.2+, so this is safe
    pass

try:
    from mercurial import ignore
    ignore.readpats
    ignoremod = True
except ImportError:
    # The ignore module disappeared in Mercurial 3.5
    ignoremod = False

baseset = set
try:
    baseset = revset.baseset
except AttributeError:
    # baseset was added in hg 3.0
    pass


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

__version__ = '0.8.3'

testedwith = '2.8.2 3.0.1 3.1 3.2.2 3.3 3.4 3.5 3.6'
buglink = 'https://bitbucket.org/durin42/hg-git/issues'

cmdtable = {}
command = cmdutil.command(cmdtable)

# support for `hg clone git://github.com/defunkt/facebox.git`
# also hg clone git+ssh://git@github.com/schacon/simplegit.git
for _scheme in util.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 _isgitdir(path):
    """True if the given file path is a git repo."""
    if os.path.exists(os.path.join(path, '.hg')):
        return False

    if os.path.exists(os.path.join(path, '.git')):
        # is full git repo
        return True

    if (os.path.exists(os.path.join(path, 'HEAD')) and
        os.path.exists(os.path.join(path, 'objects')) and
        os.path.exists(os.path.join(path, 'refs'))):
        # is bare git repo
        return True

    return False

def _local(path):
    p = urlcls(path).localpath()
    if _isgitdir(p):
        return gitrepo
    # detect git ssh urls (which mercurial thinks is a file-like path)
    if util.isgitsshuri(p):
        return gitrepo
    return _oldlocal(path)

hg.schemes['file'] = _local

# we need to wrap this so that git-like ssh paths are not prepended with a
# local filesystem path. ugh.
def _url(orig, path, **kwargs):
    # we'll test for 'git@' then use our heuristic method to determine if it's
    # a git uri
    if not (path.startswith(os.sep) and ':' in path):
        return orig(path, **kwargs)

    # the file path will be everything up until the last slash right before the
    # ':'
    lastsep = path.rindex(os.sep, None, path.index(':')) + 1
    gituri = path[lastsep:]

    if util.isgitsshuri(gituri):
        return orig(gituri, **kwargs)
    return orig(path, **kwargs)

extensions.wrapfunction(hgutil, 'url', _url)


def _httpgitwrapper(orig):
    # we should probably test the connection but for now, we just keep it
    # simple and check for a url ending in '.git'
    def httpgitscheme(uri):
        if uri.endswith('.git'):
            return gitrepo

        # the http(s) scheme just returns the _peerlookup
        return orig

    return httpgitscheme

hg.schemes['https'] = _httpgitwrapper(hg.schemes['https'])
hg.schemes['http'] = _httpgitwrapper(hg.schemes['http'])

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

    if source.endswith('.git'):
        return hgdefaultdest(source[:-4])

    return hgdefaultdest(source)
hg.defaultdest = defaultdest

def getversion():
    """return version with dependencies for hg --version -v"""
    import dulwich
    dulver = '.'.join(str(i) for i in dulwich.__version__)
    return __version__ + (" (dulwich %s)" % dulver)

# 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 hgutil.safehasattr(lrepo, 'changelog') and co not in lrepo.changelog:
        co = None
    return revs, co
if getattr(hg, 'addbranchrevs', False):
    extensions.wrapfunction(hg, 'addbranchrevs', safebranchrevs)

def extsetup(ui):
    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"),
             # Mercurial >= 3.6: doc(ui)
             lambda *args: open(os.path.join(helpdir, 'git.rst')).read())
    insort(help.helptable, entry)

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

if hgutil.safehasattr(manifest, '_lazymanifest'):
    # Mercurial >= 3.4
    extensions.wrapfunction(manifest.manifestdict, 'diff',
                            overlay.wrapmanifestdictdiff)

@command('gimport')
def gimport(ui, repo, remote_name=None):
    '''import commits from Git to Mercurial'''
    repo.githandler.import_commits(remote_name)

@command('gexport')
def gexport(ui, repo):
    '''export commits from Mercurial to Git'''
    repo.githandler.export_commits()

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

@command('gverify',
         [('r', 'rev', '', _('revision to verify'), _('REV'))],
         _('[-r REV]'))
def gverify(ui, repo, **opts):
    '''verify that a Mercurial rev matches the corresponding Git rev

    Given a Mercurial revision that has a corresponding Git revision in the map,
    this attempts to answer whether that revision has the same contents as the
    corresponding Git revision.

    '''
    ctx = scmutil.revsingle(repo, opts.get('rev'), '.')
    return verify.verify(ui, repo, ctx)

if (getattr(dirstate, 'rootcache', False) and
    (not ignoremod or getattr(ignore, 'readpats', False))):
    # only install our dirstate wrapper if it has a hope of working
    import gitdirstate
    if ignoremod:
        def ignorewrap(orig, *args, **kwargs):
            return gitdirstate.gignore(*args, **kwargs)
        extensions.wrapfunction(ignore, 'ignore', ignorewrap)
    dirstate.dirstate = gitdirstate.gitdirstate

@command('git-cleanup')
def git_cleanup(ui, repo):
    '''clean up Git commit map after history editing'''
    new_map = []
    for line in repo.opener(GitHandler.map_file):
        gitsha, hgsha = line.strip().split(' ', 1)
        if hgsha in repo:
            new_map.append('%s %s\n' % (gitsha, hgsha))
    f = repo.opener(GitHandler.map_file, 'wb')
    map(f.write, new_map)
    ui.status(_('git commit map cleaned\n'))

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)
extensions.wrapfunction(bundlerepo, 'getremotechanges', getremotechanges)

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 isvalidlocalpath(orig, self, path):
    return orig(self, path) or _isgitdir(path)
if (hgutil.safehasattr(hgui, 'path') and
    hgutil.safehasattr(hgui.path, '_isvalidlocalpath')):
    extensions.wrapfunction(hgui.path, '_isvalidlocalpath', isvalidlocalpath)

@util.transform_notgit
def exchangepull(orig, repo, remote, heads=None, force=False, bookmarks=(),
                 **kwargs):
    if isinstance(remote, gitrepo.gitrepo):
        # transaction manager is present in Mercurial >= 3.3
        try:
            trmanager = getattr(exchange, 'transactionmanager')
        except AttributeError:
            trmanager = None
        pullop = exchange.pulloperation(repo, remote, heads, force,
                                        bookmarks=bookmarks)
        if trmanager:
            pullop.trmanager = trmanager(repo, 'pull', remote.url())
        wlock = repo.wlock()
        lock = repo.lock()
        try:
            pullop.cgresult = repo.githandler.fetch(remote.path, heads)
            if trmanager:
                pullop.trmanager.close()
            else:
                pullop.closetransaction()
            return pullop
        finally:
            if trmanager:
                pullop.trmanager.release()
            else:
                pullop.releasetransaction()
            lock.release()
            wlock.release()
    else:
        return orig(repo, remote, heads, force, bookmarks=bookmarks, **kwargs)
if not hgutil.safehasattr(localrepo.localrepository, 'pull'):
    # Mercurial >= 3.2
    extensions.wrapfunction(exchange, 'pull', exchangepull)

# TODO figure out something useful to do with the newbranch param
@util.transform_notgit
def exchangepush(orig, repo, remote, force=False, revs=None, newbranch=False,
                 bookmarks=(), **kwargs):
    if isinstance(remote, gitrepo.gitrepo):
        # opargs is in Mercurial >= 3.6
        opargs = kwargs.get('opargs')
        if opargs is None:
            opargs = {}
        pushop = exchange.pushoperation(repo, remote, force, revs, newbranch,
                                        bookmarks, **opargs)
        pushop.cgresult = repo.githandler.push(remote.path, revs, force)
        return pushop
    else:
        return orig(repo, remote, force, revs, newbranch, bookmarks=bookmarks,
                    **kwargs)
if not hgutil.safehasattr(localrepo.localrepository, 'push'):
    # Mercurial >= 3.2
    extensions.wrapfunction(exchange, 'push', exchangepush)

def revset_fromgit(repo, subset, x):
    '''``fromgit()``
    Select changesets that originate from Git.
    '''
    revset.getargs(x, 0, 0, "fromgit takes no arguments")
    git = repo.githandler
    node = repo.changelog.node
    return baseset(r for r in subset
                   if git.map_git_get(hex(node(r))) 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 = repo.githandler
    node = repo.changelog.node

    def matches(r):
        gitnode = git.map_git_get(hex(node(r)))
        if gitnode is None:
            return False
        return rev in [gitnode, gitnode[:12]]
    return baseset(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']
    gitnode = repo.githandler.map_git_get(node.hex())
    if gitnode is None:
        gitnode = ''
    return gitnode
