# Minimal support for git commands on an hg repository

#

# Copyright 2005, 2006 Chris Mason <mason@suse.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2, incorporated herein by reference.

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 node node')),

    "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 [options] revs')),

}