# gnuarch.py - GNU Arch support for the convert extension

#

#  Copyright 2008, 2009 Aleix Conchillo Flaque <aleix@member.fsf.org>

#  and others

#

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

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import email

import os

import shutil

import stat

import tempfile

from mercurial.i18n import _

from mercurial import (

    encoding,

    error,

    util,

)

from . import common

class gnuarch_source(common.converter_source, common.commandline):

    class gnuarch_rev(object):

        def __init__(self, rev):

            self.rev = rev

            self.summary = ''

            self.date = None

            self.author = ''

            self.continuationof = None

            self.add_files = []

            self.mod_files = []

            self.del_files = []

            self.ren_files = {}

            self.ren_dirs = {}

    def __init__(self, ui, path, revs=None):

        super(gnuarch_source, self).__init__(ui, path, revs=revs)

        if not os.path.exists(os.path.join(path, '{arch}')):

            raise common.NoRepo(_("%s does not look like a GNU Arch repository")

                         % path)

        # Could use checktool, but we want to check for baz or tla.

        self.execmd = None

        if util.findexe('baz'):

            self.execmd = 'baz'

        else:

            if util.findexe('tla'):

                self.execmd = 'tla'

            else:

                raise error.Abort(_('cannot find a GNU Arch tool'))

        common.commandline.__init__(self, ui, self.execmd)

        self.path = os.path.realpath(path)

        self.tmppath = None

        self.treeversion = None

        self.lastrev = None

        self.changes = {}

        self.parents = {}

        self.tags = {}

        self.catlogparser = email.Parser.Parser()

        self.encoding = encoding.encoding

        self.archives = []

    def before(self):

        # Get registered archives

        self.archives = [i.rstrip('\n')

                         for i in self.runlines0('archives', '-n')]

        if self.execmd == 'tla':

            output = self.run0('tree-version', self.path)

        else:

            output = self.run0('tree-version', '-d', self.path)

        self.treeversion = output.strip()

        # Get name of temporary directory

        version = self.treeversion.split('/')

        self.tmppath = os.path.join(tempfile.gettempdir(),

                                    'hg-%s' % version[1])

        # Generate parents dictionary

        self.parents[None] = []

        treeversion = self.treeversion

        child = None

        while treeversion:

            self.ui.status(_('analyzing tree version %s...\n') % treeversion)

            archive = treeversion.split('/')[0]

            if archive not in self.archives:

                self.ui.status(_('tree analysis stopped because it points to '

                                 'an unregistered archive %s...\n') % archive)

                break

            # Get the complete list of revisions for that tree version

            output, status = self.runlines('revisions', '-r', '-f', treeversion)

            self.checkexit(status, 'failed retrieving revisions for %s'

                           % treeversion)

            # No new iteration unless a revision has a continuation-of header

            treeversion = None

            for l in output:

                rev = l.strip()

                self.changes[rev] = self.gnuarch_rev(rev)

                self.parents[rev] = []

                # Read author, date and summary

                catlog, status = self.run('cat-log', '-d', self.path, rev)

                if status:

                    catlog  = self.run0('cat-archive-log', rev)

                self._parsecatlog(catlog, rev)

                # Populate the parents map

                self.parents[child].append(rev)

                # Keep track of the current revision as the child of the next

                # revision scanned

                child = rev

                # Check if we have to follow the usual incremental history

                # or if we have to 'jump' to a different treeversion given

                # by the continuation-of header.

                if self.changes[rev].continuationof:

                    treeversion = '--'.join(

                        self.changes[rev].continuationof.split('--')[:-1])

                    break

                # If we reached a base-0 revision w/o any continuation-of

                # header, it means the tree history ends here.

                if rev[-6:] == 'base-0':

                    break

    def after(self):

        self.ui.debug('cleaning up %s\n' % self.tmppath)

        shutil.rmtree(self.tmppath, ignore_errors=True)

    def getheads(self):

        return self.parents[None]

    def getfile(self, name, rev):

        if rev != self.lastrev:

            raise error.Abort(_('internal calling inconsistency'))

        if not os.path.lexists(os.path.join(self.tmppath, name)):

            return None, None

        return self._getfile(name, rev)

    def getchanges(self, rev, full):

        if full:

            raise error.Abort(_("convert from arch does not support --full"))

        self._update(rev)

        changes = []

        copies = {}

        for f in self.changes[rev].add_files:

            changes.append((f, rev))

        for f in self.changes[rev].mod_files:

            changes.append((f, rev))

        for f in self.changes[rev].del_files:

            changes.append((f, rev))

        for src in self.changes[rev].ren_files:

            to = self.changes[rev].ren_files[src]

            changes.append((src, rev))

            changes.append((to, rev))

            copies[to] = src

        for src in self.changes[rev].ren_dirs:

            to = self.changes[rev].ren_dirs[src]

            chgs, cps = self._rendirchanges(src, to)

            changes += [(f, rev) for f in chgs]

            copies.update(cps)

        self.lastrev = rev

        return sorted(set(changes)), copies, set()

    def getcommit(self, rev):

        changes = self.changes[rev]

        return common.commit(author=changes.author, date=changes.date,

                             desc=changes.summary, parents=self.parents[rev],

                             rev=rev)

    def gettags(self):

        return self.tags

    def _execute(self, cmd, *args, **kwargs):

        cmdline = [self.execmd, cmd]

        cmdline += args

        cmdline = [util.shellquote(arg) for arg in cmdline]

        cmdline += ['>', os.devnull, '2>', os.devnull]

        cmdline = util.quotecommand(' '.join(cmdline))

        self.ui.debug(cmdline, '\n')

        return os.system(cmdline)

    def _update(self, rev):

        self.ui.debug('applying revision %s...\n' % rev)

        changeset, status = self.runlines('replay', '-d', self.tmppath,

                                              rev)

        if status:

            # Something went wrong while merging (baz or tla

            # issue?), get latest revision and try from there

            shutil.rmtree(self.tmppath, ignore_errors=True)

            self._obtainrevision(rev)

        else:

            old_rev = self.parents[rev][0]

            self.ui.debug('computing changeset between %s and %s...\n'

                          % (old_rev, rev))

            self._parsechangeset(changeset, rev)

    def _getfile(self, name, rev):

        mode = os.lstat(os.path.join(self.tmppath, name)).st_mode

        if stat.S_ISLNK(mode):

            data = os.readlink(os.path.join(self.tmppath, name))

            if mode:

                mode = 'l'

            else:

                mode = ''

        else:

            data = open(os.path.join(self.tmppath, name), 'rb').read()

            mode = (mode & 0o111) and 'x' or ''

        return data, mode

    def _exclude(self, name):

        exclude = ['{arch}', '.arch-ids', '.arch-inventory']

        for exc in exclude:

            if name.find(exc) != -1:

                return True

        return False

    def _readcontents(self, path):

        files = []

        contents = os.listdir(path)

        while len(contents) > 0:

            c = contents.pop()

            p = os.path.join(path, c)

            # os.walk could be used, but here we avoid internal GNU

            # Arch files and directories, thus saving a lot time.

            if not self._exclude(p):

                if os.path.isdir(p):

                    contents += [os.path.join(c, f) for f in os.listdir(p)]

                else:

                    files.append(c)

        return files

    def _rendirchanges(self, src, dest):

        changes = []

        copies = {}

        files = self._readcontents(os.path.join(self.tmppath, dest))

        for f in files:

            s = os.path.join(src, f)

            d = os.path.join(dest, f)

            changes.append(s)

            changes.append(d)

            copies[d] = s

        return changes, copies

    def _obtainrevision(self, rev):

        self.ui.debug('obtaining revision %s...\n' % rev)

        output = self._execute('get', rev, self.tmppath)

        self.checkexit(output)

        self.ui.debug('analyzing revision %s...\n' % rev)

        files = self._readcontents(self.tmppath)

        self.changes[rev].add_files += files

    def _stripbasepath(self, path):

        if path.startswith('./'):

            return path[2:]

        return path

    def _parsecatlog(self, data, rev):

        try:

            catlog = self.catlogparser.parsestr(data)

            # Commit date

            self.changes[rev].date = util.datestr(

                util.strdate(catlog['Standard-date'],

                             '%Y-%m-%d %H:%M:%S'))

            # Commit author

            self.changes[rev].author = self.recode(catlog['Creator'])

            # Commit description

            self.changes[rev].summary = '\n\n'.join((catlog['Summary'],

                                                    catlog.get_payload()))

            self.changes[rev].summary = self.recode(self.changes[rev].summary)

            # Commit revision origin when dealing with a branch or tag

            if 'Continuation-of' in catlog:

                self.changes[rev].continuationof = self.recode(

                    catlog['Continuation-of'])

        except Exception:

            raise error.Abort(_('could not parse cat-log of %s') % rev)

    def _parsechangeset(self, data, rev):

        for l in data:

            l = l.strip()

            # Added file (ignore added directory)

            if l.startswith('A') and not l.startswith('A/'):

                file = self._stripbasepath(l[1:].strip())

                if not self._exclude(file):

                    self.changes[rev].add_files.append(file)

            # Deleted file (ignore deleted directory)

            elif l.startswith('D') and not l.startswith('D/'):

                file = self._stripbasepath(l[1:].strip())

                if not self._exclude(file):

                    self.changes[rev].del_files.append(file)

            # Modified binary file

            elif l.startswith('Mb'):

                file = self._stripbasepath(l[2:].strip())

                if not self._exclude(file):

                    self.changes[rev].mod_files.append(file)

            # Modified link

            elif l.startswith('M->'):

                file = self._stripbasepath(l[3:].strip())

                if not self._exclude(file):

                    self.changes[rev].mod_files.append(file)

            # Modified file

            elif l.startswith('M'):

                file = self._stripbasepath(l[1:].strip())

                if not self._exclude(file):

                    self.changes[rev].mod_files.append(file)

            # Renamed file (or link)

            elif l.startswith('=>'):

                files = l[2:].strip().split(' ')

                if len(files) == 1:

                    files = l[2:].strip().split('\t')

                src = self._stripbasepath(files[0])

                dst = self._stripbasepath(files[1])

                if not self._exclude(src) and not self._exclude(dst):

                    self.changes[rev].ren_files[src] = dst

            # Conversion from file to link or from link to file (modified)

            elif l.startswith('ch'):

                file = self._stripbasepath(l[2:].strip())

                if not self._exclude(file):

                    self.changes[rev].mod_files.append(file)

            # Renamed directory

            elif l.startswith('/>'):

                dirs = l[2:].strip().split(' ')

                if len(dirs) == 1:

                    dirs = l[2:].strip().split('\t')

                src = self._stripbasepath(dirs[0])

                dst = self._stripbasepath(dirs[1])

                if not self._exclude(src) and not self._exclude(dst):

                    self.changes[rev].ren_dirs[src] = dst