# 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, incorporated herein by reference.

import sys, os

from mercurial import hg, fancyopts, commands, ui, util, patch, revlog

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.changectx(node1).manifest()

        mmap2 = repo.changectx(node2).manifest()

        status = repo.status(node1, node2, files=files)[:5]

        modified, added, removed, deleted, unknown = status

        empty = hg.short(hg.nullid)

        for f in modified:

            # TODO get file permissions

            print ":100664 100664 %s %s M\t%s\t%s" % (hg.short(mmap[f]),

                                                      hg.short(mmap2[f]),

                                                      f, f)

        for f in added:

            print ":000000 100664 %s %s N\t%s\t%s" % (empty,

                                                      hg.short(mmap2[f]),

                                                      f, f)

        for f in removed:

            print ":100664 000000 %s %s D\t%s\t%s" % (hg.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(repo, node2, "")

            patch.diff(repo, node1, node2,

                       files=files,

                       opts=patch.diffopts(ui, {'git': True}))

        else:

            __difftree(repo, node1, node2, files=files)

        if not opts['stdin']:

            break

def catcommit(repo, n, prefix, ctx=None):

    nlprefix = '\n' + prefix;

    if ctx is None:

        ctx = repo.changectx(n)

    (p1, p2) = ctx.parents()

    print "tree %s" % (hg.short(ctx.changeset()[0])) # use ctx.node() instead ??

    if p1: print "parent %s" % (hg.short(p1.node()))

    if p2: print "parent %s" % (hg.short(p2.node()))

    date = ctx.date()

    lines = description.splitlines()

    if lines and lines[-1].startswith('committer:'):

        committer = lines[-1].split(': ')[1].rstrip()

    else:

        committer = ctx.user()

    print "author %s %s %s" % (ctx.user(), int(date[0]), date[1])

    print "committer %s %s %s" % (committer, int(date[0]), date[1])

    print "revision %d" % ctx.rev()

    print ""

    if prefix != "":

        print "%s%s" % (prefix, description.replace('\n', nlprefix).strip())

    else:

        print description

    if prefix:

        sys.stdout.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)

    print hg.short(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":

            sys.stderr.write("aborting hg cat-file only understands commits\n")

            sys.exit(1);

        n = repo.lookup(r)

        catcommit(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(args, repo, full="tree", maxnr=0, parents=False):

    def chlogwalk():

        count = repo.changelog.count()

        i = count

        l = [0] * 100

        chunk = 100

        while True:

            if chunk > i:

                chunk = i

                i = 0

            else:

                i -= chunk

            for x in xrange(0, chunk):

                if i + x >= count:

                    l[chunk - x:] = [0] * (chunk - x)

                    break

                if full != None:

                    l[x] = repo.changectx(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 in xrange(len(args)):

        if args[i].startswith('^'):

            s = repo.lookup(args[i][1:])

            stop_sha1.append(s)

            want_sha1.append(s)

        elif args[i] != 'HEAD':

            want_sha1.append(repo.lookup(args[i]))

    # calculate the graph for the supplied commits

    for i in xrange(len(want_sha1)):

        reachable.append({});

        n = want_sha1[i];

        visit = [n];

        reachable[i][n] = 1

        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][p] = 1

                    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] != hg.nullid:

                    parentstr += " " + hg.short(pp[0])

                if pp[1] != hg.nullid:

                    parentstr += " " + hg.short(pp[1])

            if not full:

                print hg.short(n) + parentstr

            elif full == "commit":

                print hg.short(n) + parentstr

                catcommit(repo, n, '    ', ctx)

            else:

                (p1, p2) = repo.changelog.parents(n)

                (h, h1, h2) = map(hg.short, (n, p1, p2))

                (i1, i2) = map(repo.changelog.rev, (p1, p2))

                date = ctx.date()[0]

                print "%s %s:%s" % (date, h, mask),

                mask = is_reachable(want_sha1, reachable, p1)

                if i1 != hg.nullrev and mask > 0:

                    print "%s:%s " % (h1, mask),

                mask = is_reachable(want_sha1, reachable, p2)

                if i2 != hg.nullrev and mask > 0:

                    print "%s:%s " % (h2, mask),

                print ""

            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(copy, repo, full, opts['max_count'], opts['parents'])

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)

    os.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 [options] node1 node2 [files...]"),

    "debug-cat-file": (catfile, [('s', 'stdin', None, 'stdin')],

                 "hg debug-cat-file [options] type file"),

    "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"),

}