# hg.py - repository classes for mercurial
#
# Copyright 2005-2007 Matt Mackall <[email protected]>
# Copyright 2006 Vadim Gelfer <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

from i18n import _
from lock import release
import localrepo, bundlerepo, httprepo, sshrepo, statichttprepo
import lock, util, extensions, error
import merge as _merge
import verify as _verify
import errno, os, shutil

def _local(path):
   return (os.path.isfile(util.drop_scheme('file', path)) and
           bundlerepo or localrepo)

def parseurl(url, revs=[]):
   '''parse url#branch, returning url, branch + revs'''

   if '#' not in url:
       return url, (revs or None), revs and revs[-1] or None

   url, branch = url.split('#', 1)
   checkout = revs and revs[-1] or branch
   return url, (revs or []) + [branch], checkout

schemes = {
   'bundle': bundlerepo,
   'file': _local,
   'http': httprepo,
   'https': httprepo,
   'ssh': sshrepo,
   'static-http': statichttprepo,
}

def _lookup(path):
   scheme = 'file'
   if path:
       c = path.find(':')
       if c > 0:
           scheme = path[:c]
   thing = schemes.get(scheme) or schemes['file']
   try:
       return thing(path)
   except TypeError:
       return thing

def islocal(repo):
   '''return true if repo or path is local'''
   if isinstance(repo, str):
       try:
           return _lookup(repo).islocal(repo)
       except AttributeError:
           return False
   return repo.local()

def repository(ui, path='', create=False):
   """return a repository object for the specified path"""
   repo = _lookup(path).instance(ui, path, create)
   ui = getattr(repo, "ui", ui)
   for name, module in extensions.extensions():
       hook = getattr(module, 'reposetup', None)
       if hook:
           hook(ui, repo)
   return repo

def defaultdest(source):
   '''return default destination of clone if none is given'''
   return os.path.basename(os.path.normpath(source))

def localpath(path):
   if path.startswith('file://localhost/'):
       return path[16:]
   if path.startswith('file://'):
       return path[7:]
   if path.startswith('file:'):
       return path[5:]
   return path

def share(ui, source, dest=None, update=True):
   '''create a shared repository'''

   if not islocal(source):
       raise util.Abort(_('can only share local repositories'))

   if not dest:
       dest = os.path.basename(source)
   else:
       dest = ui.expandpath(dest)

   if isinstance(source, str):
       origsource = ui.expandpath(source)
       source, rev, checkout = parseurl(origsource, '')
       srcrepo = repository(ui, source)
   else:
       srcrepo = source
       origsource = source = srcrepo.url()
       checkout = None

   sharedpath = srcrepo.sharedpath # if our source is already sharing

   root = os.path.realpath(dest)
   roothg = os.path.join(root, '.hg')

   if os.path.exists(roothg):
       raise util.Abort(_('destination already exists'))

   if not os.path.isdir(root):
       os.mkdir(root)
   os.mkdir(roothg)

   requirements = ''
   try:
       requirements = srcrepo.opener('requires').read()
   except IOError, inst:
       if inst.errno != errno.ENOENT:
           raise

   requirements += 'shared\n'
   file(os.path.join(roothg, 'requires'), 'w').write(requirements)
   file(os.path.join(roothg, 'sharedpath'), 'w').write(sharedpath)

   default = srcrepo.ui.config('paths', 'default')
   if default:
       f = file(os.path.join(roothg, 'hgrc'), 'w')
       f.write('[paths]\ndefault = %s\n' % default)
       f.close()

   r = repository(ui, root)

   if update:
       r.ui.status(_("updating working directory\n"))
       if update is not True:
           checkout = update
       for test in (checkout, 'default', 'tip'):
           try:
               uprev = r.lookup(test)
               break
           except LookupError:
               continue
       _update(r, uprev)

def clone(ui, source, dest=None, pull=False, rev=None, update=True,
         stream=False):
   """Make a copy of an existing repository.

   Create a copy of an existing repository in a new directory.  The
   source and destination are URLs, as passed to the repository
   function.  Returns a pair of repository objects, the source and
   newly created destination.

   The location of the source is added to the new repository's
   .hg/hgrc file, as the default to be used for future pulls and
   pushes.

   If an exception is raised, the partly cloned/updated destination
   repository will be deleted.

   Arguments:

   source: repository object or URL

   dest: URL of destination repository to create (defaults to base
   name of source repository)

   pull: always pull from source repository, even in local case

   stream: stream raw data uncompressed from repository (fast over
   LAN, slow over WAN)

   rev: revision to clone up to (implies pull=True)

   update: update working directory after clone completes, if
   destination is local repository (True means update to default rev,
   anything else is treated as a revision)
   """

   if isinstance(source, str):
       origsource = ui.expandpath(source)
       source, rev, checkout = parseurl(origsource, rev)
       src_repo = repository(ui, source)
   else:
       src_repo = source
       origsource = source = src_repo.url()
       checkout = rev and rev[-1] or None

   if dest is None:
       dest = defaultdest(source)
       ui.status(_("destination directory: %s\n") % dest)
   else:
       dest = ui.expandpath(dest)

   dest = localpath(dest)
   source = localpath(source)

   if os.path.exists(dest):
       if not os.path.isdir(dest):
           raise util.Abort(_("destination '%s' already exists") % dest)
       elif os.listdir(dest):
           raise util.Abort(_("destination '%s' is not empty") % dest)

   class DirCleanup(object):
       def __init__(self, dir_):
           self.rmtree = shutil.rmtree
           self.dir_ = dir_
       def close(self):
           self.dir_ = None
       def cleanup(self):
           if self.dir_:
               self.rmtree(self.dir_, True)

   src_lock = dest_lock = dir_cleanup = None
   try:
       if islocal(dest):
           dir_cleanup = DirCleanup(dest)

       abspath = origsource
       copy = False
       if src_repo.cancopy() and islocal(dest):
           abspath = os.path.abspath(util.drop_scheme('file', origsource))
           copy = not pull and not rev

       if copy:
           try:
               # we use a lock here because if we race with commit, we
               # can end up with extra data in the cloned revlogs that's
               # not pointed to by changesets, thus causing verify to
               # fail
               src_lock = src_repo.lock(wait=False)
           except error.LockError:
               copy = False

       if copy:
           src_repo.hook('preoutgoing', throw=True, source='clone')
           hgdir = os.path.realpath(os.path.join(dest, ".hg"))
           if not os.path.exists(dest):
               os.mkdir(dest)
           else:
               # only clean up directories we create ourselves
               dir_cleanup.dir_ = hgdir
           try:
               dest_path = hgdir
               os.mkdir(dest_path)
           except OSError, inst:
               if inst.errno == errno.EEXIST:
                   dir_cleanup.close()
                   raise util.Abort(_("destination '%s' already exists")
                                    % dest)
               raise

           for f in src_repo.store.copylist():
               src = os.path.join(src_repo.path, f)
               dst = os.path.join(dest_path, f)
               dstbase = os.path.dirname(dst)
               if dstbase and not os.path.exists(dstbase):
                   os.mkdir(dstbase)
               if os.path.exists(src):
                   if dst.endswith('data'):
                       # lock to avoid premature writing to the target
                       dest_lock = lock.lock(os.path.join(dstbase, "lock"))
                   util.copyfiles(src, dst)

           # we need to re-init the repo after manually copying the data
           # into it
           dest_repo = repository(ui, dest)
           src_repo.hook('outgoing', source='clone', node='0'*40)
       else:
           try:
               dest_repo = repository(ui, dest, create=True)
           except OSError, inst:
               if inst.errno == errno.EEXIST:
                   dir_cleanup.close()
                   raise util.Abort(_("destination '%s' already exists")
                                    % dest)
               raise

           revs = None
           if rev:
               if 'lookup' not in src_repo.capabilities:
                   raise util.Abort(_("src repository does not support "
                                      "revision lookup and so doesn't "
                                      "support clone by revision"))
               revs = [src_repo.lookup(r) for r in rev]
               checkout = revs[0]
           if dest_repo.local():
               dest_repo.clone(src_repo, heads=revs, stream=stream)
           elif src_repo.local():
               src_repo.push(dest_repo, revs=revs)
           else:
               raise util.Abort(_("clone from remote to remote not supported"))

       if dir_cleanup:
           dir_cleanup.close()

       if dest_repo.local():
           fp = dest_repo.opener("hgrc", "w", text=True)
           fp.write("[paths]\n")
           fp.write("default = %s\n" % abspath)
           fp.close()

           dest_repo.ui.setconfig('paths', 'default', abspath)

           if update:
               dest_repo.ui.status(_("updating working directory\n"))
               if update is not True:
                   checkout = update
               for test in (checkout, 'default', 'tip'):
                   try:
                       uprev = dest_repo.lookup(test)
                       break
                   except:
                       continue
               _update(dest_repo, uprev)

       return src_repo, dest_repo
   finally:
       release(src_lock, dest_lock)
       if dir_cleanup is not None:
           dir_cleanup.cleanup()

def _showstats(repo, stats):
   stats = ((stats[0], _("updated")),
            (stats[1], _("merged")),
            (stats[2], _("removed")),
            (stats[3], _("unresolved")))
   note = ", ".join([_("%d files %s") % s for s in stats])
   repo.ui.status("%s\n" % note)

def update(repo, node):
   """update the working directory to node, merging linear changes"""
   stats = _merge.update(repo, node, False, False, None)
   _showstats(repo, stats)
   if stats[3]:
       repo.ui.status(_("use 'hg resolve' to retry unresolved file merges\n"))
   return stats[3] > 0

# naming conflict in clone()
_update = update

def clean(repo, node, show_stats=True):
   """forcibly switch the working directory to node, clobbering changes"""
   stats = _merge.update(repo, node, False, True, None)
   if show_stats: _showstats(repo, stats)
   return stats[3] > 0

def merge(repo, node, force=None, remind=True):
   """branch merge with node, resolving changes"""
   stats = _merge.update(repo, node, True, force, False)
   _showstats(repo, stats)
   if stats[3]:
       repo.ui.status(_("use 'hg resolve' to retry unresolved file merges "
                        "or 'hg up --clean' to abandon\n"))
   elif remind:
       repo.ui.status(_("(branch merge, don't forget to commit)\n"))
   return stats[3] > 0

def revert(repo, node, choose):
   """revert changes to revision in node without updating dirstate"""
   return _merge.update(repo, node, False, True, choose)[3] > 0

def verify(repo):
   """verify the consistency of a repository"""
   return _verify.verify(repo)

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