# Minimal support for git commands on an hg repository
#
# Copyright 2005, 2006 Chris Mason <[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.

'''browse the repository in a graphical way

The hgk extension allows browsing the history of a repository in a
graphical way. It requires Tcl/Tk version 8.4 or later. (Tcl/Tk is not
distributed with Mercurial.)

hgk consists of two parts: a Tcl script that does the displaying and
querying of information, and an extension to Mercurial named hgk.py,
which provides hooks for hgk to get information. hgk can be found in
the contrib directory, and the extension is shipped in the hgext
repository, and needs to be enabled.

The hg view command will launch the hgk Tcl script. For this command
to work, hgk must be in your search path. Alternately, you can specify
the path to hgk in your .hgrc file::

 [hgk]
 path=/location/of/hgk

hgk can make use of the extdiff extension to visualize revisions.
Assuming you had already configured extdiff vdiff command, just add::

 [hgk]
 vdiff=vdiff

Revisions context menu will now display additional entries to fire
vdiff on hovered and selected revisions.
'''

import os
from mercurial import commands, util, patch, revlog, cmdutil
from mercurial.node import nullid, nullrev, short
from mercurial.i18n import _

def difftree(ui, repo, node1=None, node2=None, *files, **opts):
   """diff trees from two commits"""
   def __difftree(repo, node1, node2, files=[]):
       assert node2 is not None
       mmap = repo[node1].manifest()
       mmap2 = repo[node2].manifest()
       m = cmdutil.match(repo, files)
       modified, added, removed  = repo.status(node1, node2, m)[:3]
       empty = short(nullid)

       for f in modified:
           # TODO get file permissions
           ui.write(":100664 100664 %s %s M\t%s\t%s\n" %
                    (short(mmap[f]), short(mmap2[f]), f, f))
       for f in added:
           ui.write(":000000 100664 %s %s N\t%s\t%s\n" %
                    (empty, short(mmap2[f]), f, f))
       for f in removed:
           ui.write(":100664 000000 %s %s D\t%s\t%s\n" %
                    (short(mmap[f]), empty, f, f))
   ##

   while True:
       if opts['stdin']:
           try:
               line = raw_input().split(' ')
               node1 = line[0]
               if len(line) > 1:
                   node2 = line[1]
               else:
                   node2 = None
           except EOFError:
               break
       node1 = repo.lookup(node1)
       if node2:
           node2 = repo.lookup(node2)
       else:
           node2 = node1
           node1 = repo.changelog.parents(node1)[0]
       if opts['patch']:
           if opts['pretty']:
               catcommit(ui, repo, node2, "")
           m = cmdutil.match(repo, files)
           chunks = patch.diff(repo, node1, node2, match=m,
                               opts=patch.diffopts(ui, {'git': True}))
           for chunk in chunks:
               ui.write(chunk)
       else:
           __difftree(repo, node1, node2, files=files)
       if not opts['stdin']:
           break

def catcommit(ui, repo, n, prefix, ctx=None):
   nlprefix = '\n' + prefix;
   if ctx is None:
       ctx = repo[n]
   ui.write("tree %s\n" % short(ctx.changeset()[0])) # use ctx.node() instead ??
   for p in ctx.parents():
       ui.write("parent %s\n" % p)

   date = ctx.date()
   description = ctx.description().replace("\0", "")
   lines = description.splitlines()
   if lines and lines[-1].startswith('committer:'):
       committer = lines[-1].split(': ')[1].rstrip()
   else:
       committer = ctx.user()

   ui.write("author %s %s %s\n" % (ctx.user(), int(date[0]), date[1]))
   ui.write("committer %s %s %s\n" % (committer, int(date[0]), date[1]))
   ui.write("revision %d\n" % ctx.rev())
   ui.write("branch %s\n\n" % ctx.branch())

   if prefix != "":
       ui.write("%s%s\n" % (prefix, description.replace('\n', nlprefix).strip()))
   else:
       ui.write(description + "\n")
   if prefix:
       ui.write('\0')

def base(ui, repo, node1, node2):
   """output common ancestor information"""
   node1 = repo.lookup(node1)
   node2 = repo.lookup(node2)
   n = repo.changelog.ancestor(node1, node2)
   ui.write(short(n) + "\n")

def catfile(ui, repo, type=None, r=None, **opts):
   """cat a specific revision"""
   # in stdin mode, every line except the commit is prefixed with two
   # spaces.  This way the our caller can find the commit without magic
   # strings
   #
   prefix = ""
   if opts['stdin']:
       try:
           (type, r) = raw_input().split(' ');
           prefix = "    "
       except EOFError:
           return

   else:
       if not type or not r:
           ui.warn(_("cat-file: type or revision not supplied\n"))
           commands.help_(ui, 'cat-file')

   while r:
       if type != "commit":
           ui.warn(_("aborting hg cat-file only understands commits\n"))
           return 1;
       n = repo.lookup(r)
       catcommit(ui, repo, n, prefix)
       if opts['stdin']:
           try:
               (type, r) = raw_input().split(' ');
           except EOFError:
               break
       else:
           break

# git rev-tree is a confusing thing.  You can supply a number of
# commit sha1s on the command line, and it walks the commit history
# telling you which commits are reachable from the supplied ones via
# a bitmask based on arg position.
# you can specify a commit to stop at by starting the sha1 with ^
def revtree(ui, args, repo, full="tree", maxnr=0, parents=False):
   def chlogwalk():
       count = len(repo)
       i = count
       l = [0] * 100
       chunk = 100
       while True:
           if chunk > i:
               chunk = i
               i = 0
           else:
               i -= chunk

           for x in xrange(chunk):
               if i + x >= count:
                   l[chunk - x:] = [0] * (chunk - x)
                   break
               if full != None:
                   l[x] = repo[i + x]
                   l[x].changeset() # force reading
               else:
                   l[x] = 1
           for x in xrange(chunk-1, -1, -1):
               if l[x] != 0:
                   yield (i + x, full != None and l[x] or None)
           if i == 0:
               break

   # calculate and return the reachability bitmask for sha
   def is_reachable(ar, reachable, sha):
       if len(ar) == 0:
           return 1
       mask = 0
       for i in xrange(len(ar)):
           if sha in reachable[i]:
               mask |= 1 << i

       return mask

   reachable = []
   stop_sha1 = []
   want_sha1 = []
   count = 0

   # figure out which commits they are asking for and which ones they
   # want us to stop on
   for i, arg in enumerate(args):
       if arg.startswith('^'):
           s = repo.lookup(arg[1:])
           stop_sha1.append(s)
           want_sha1.append(s)
       elif arg != 'HEAD':
           want_sha1.append(repo.lookup(arg))

   # calculate the graph for the supplied commits
   for i, n in enumerate(want_sha1):
       reachable.append(set());
       visit = [n];
       reachable[i].add(n)
       while visit:
           n = visit.pop(0)
           if n in stop_sha1:
               continue
           for p in repo.changelog.parents(n):
               if p not in reachable[i]:
                   reachable[i].add(p)
                   visit.append(p)
               if p in stop_sha1:
                   continue

   # walk the repository looking for commits that are in our
   # reachability graph
   for i, ctx in chlogwalk():
       n = repo.changelog.node(i)
       mask = is_reachable(want_sha1, reachable, n)
       if mask:
           parentstr = ""
           if parents:
               pp = repo.changelog.parents(n)
               if pp[0] != nullid:
                   parentstr += " " + short(pp[0])
               if pp[1] != nullid:
                   parentstr += " " + short(pp[1])
           if not full:
               ui.write("%s%s\n" % (short(n), parentstr))
           elif full == "commit":
               ui.write("%s%s\n" % (short(n), parentstr))
               catcommit(ui, repo, n, '    ', ctx)
           else:
               (p1, p2) = repo.changelog.parents(n)
               (h, h1, h2) = map(short, (n, p1, p2))
               (i1, i2) = map(repo.changelog.rev, (p1, p2))

               date = ctx.date()[0]
               ui.write("%s %s:%s" % (date, h, mask))
               mask = is_reachable(want_sha1, reachable, p1)
               if i1 != nullrev and mask > 0:
                   ui.write("%s:%s " % (h1, mask)),
               mask = is_reachable(want_sha1, reachable, p2)
               if i2 != nullrev and mask > 0:
                   ui.write("%s:%s " % (h2, mask))
               ui.write("\n")
           if maxnr and count >= maxnr:
               break
           count += 1

def revparse(ui, repo, *revs, **opts):
   """parse given revisions"""
   def revstr(rev):
       if rev == 'HEAD':
           rev = 'tip'
       return revlog.hex(repo.lookup(rev))

   for r in revs:
       revrange = r.split(':', 1)
       ui.write('%s\n' % revstr(revrange[0]))
       if len(revrange) == 2:
           ui.write('^%s\n' % revstr(revrange[1]))

# git rev-list tries to order things by date, and has the ability to stop
# at a given commit without walking the whole repo.  TODO add the stop
# parameter
def revlist(ui, repo, *revs, **opts):
   """print revisions"""
   if opts['header']:
       full = "commit"
   else:
       full = None
   copy = [x for x in revs]
   revtree(ui, copy, repo, full, opts['max_count'], opts['parents'])

def config(ui, repo, **opts):
   """print extension options"""
   def writeopt(name, value):
       ui.write('k=%s\nv=%s\n' % (name, value))

   writeopt('vdiff', ui.config('hgk', 'vdiff', ''))


def view(ui, repo, *etc, **opts):
   "start interactive history viewer"
   os.chdir(repo.root)
   optstr = ' '.join(['--%s %s' % (k, v) for k, v in opts.iteritems() if v])
   cmd = ui.config("hgk", "path", "hgk") + " %s %s" % (optstr, " ".join(etc))
   ui.debug(_("running %s\n") % cmd)
   util.system(cmd)

cmdtable = {
   "^view":
       (view,
        [('l', 'limit', '', _('limit number of changes displayed'))],
        _('hg view [-l LIMIT] [REVRANGE]')),
   "debug-diff-tree":
       (difftree,
        [('p', 'patch', None, _('generate patch')),
         ('r', 'recursive', None, _('recursive')),
         ('P', 'pretty', None, _('pretty')),
         ('s', 'stdin', None, _('stdin')),
         ('C', 'copy', None, _('detect copies')),
         ('S', 'search', "", _('search'))],
        _('hg git-diff-tree [OPTION]... NODE1 NODE2 [FILE]...')),
   "debug-cat-file":
       (catfile,
        [('s', 'stdin', None, _('stdin'))],
        _('hg debug-cat-file [OPTION]... TYPE FILE')),
   "debug-config":
       (config, [], _('hg debug-config')),
   "debug-merge-base":
       (base, [], _('hg debug-merge-base REV REV')),
   "debug-rev-parse":
       (revparse,
        [('', 'default', '', _('ignored'))],
        _('hg debug-rev-parse REV')),
   "debug-rev-list":
       (revlist,
        [('H', 'header', None, _('header')),
         ('t', 'topo-order', None, _('topo-order')),
         ('p', 'parents', None, _('parents')),
         ('n', 'max-count', 0, _('max-count'))],
        _('hg debug-rev-list [OPTION]... REV...')),
}

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