# 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 compat
import gitrepo
import hgrepo
import overlay
import verify
import util

from bisect import insort
from git_handler import GitHandler
from mercurial.node import hex
from mercurial.error import LookupError
from mercurial.i18n import _
from mercurial import (
    bundlerepo,
    cmdutil,
    demandimport,
    dirstate,
    discovery,
    extensions,
    help,
    hg,
    ui as hgui,
    util as hgutil,
    localrepo,
    manifest,
    revset,
    scmutil,
    templatekw,
    vfs as vfsmod,
)

try:
    from mercurial import exchange
    exchange.push  # existed in first iteration of this file
except (AttributeError, 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 (AttributeError, 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__ = '0.8.10'

testedwith = ('2.8.2 2.9.2 3.0.2 3.1.2 3.2.4 3.3.3 3.4.2 3.5.2 3.6.3 3.7.3'
              '3.8.4 3.9.2 4.0.2 4.1.3 4.2.3 4.3.3 4.4')
buglink = 'https://bitbucket.org/durin42/hg-git/issues'

cmdtable = {}
configtable = {}
try:
    from mercurial import registrar
    command = registrar.command(cmdtable)
    configitem = registrar.configitem(configtable)
    compat.registerconfigs(configitem)

except (ImportError, AttributeError):
    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 _gitvfs(repo):
    """return a vfs suitable to read git related data"""
    # Mercurial >= 3.3:  repo.shared()
    if repo.sharedpath != repo.path:
        return vfsmod.vfs(repo.sharedpath)
    else:
        return repo.vfs

def reposetup(ui, repo):
    if not isinstance(repo, gitrepo.gitrepo):

        if (getattr(dirstate, 'rootcache', False) and
            (not ignoremod or getattr(ignore, 'readpats', False)) and
            hgutil.safehasattr(repo, 'vfs') and
            os.path.exists(_gitvfs(repo).join('git'))):
            # 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

        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

    Strips all Git-related metadata from the repo, including the mapping
    between Git and Mercurial changesets. This is an irreversible
    destructive operation that may prevent further interaction with
    other clones.
    '''
    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)

@command('git-cleanup')
def git_cleanup(ui, repo):
    '''clean up Git commit map after history editing'''
    new_map = []
    vfs = _gitvfs(repo)
    for line in vfs(GitHandler.map_file):
        gitsha, hgsha = line.strip().split(' ', 1)
        if hgsha in repo:
            new_map.append('%s %s\n' % (gitsha, hgsha))
    wlock = repo.wlock()
    try:
        f = vfs(GitHandler.map_file, 'wb')
        map(f.write, new_map)
    finally:
        wlock.release()
    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 the changeset that originates in the given Git revision. The hash
    may be abbreviated: `gitnode(a5b)` selects the revision whose Git hash
    starts with `a5b`. Aborts if multiple changesets match the abbreviation.
    '''
    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 gitnode.startswith(rev)
    result = baseset(r for r in subset if matches(r))
    if 0 <= len(result) < 2:
        return result
    raise LookupError(rev, git.map_file, _('ambiguous identifier'))

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