darcs.py 6.84 KB
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# -*- coding: utf-8 -*-
# Copyright (C) 2010-2015 Kai Willadsen <kai.willadsen@gmail.com>
# Copyright (C)      2016 Guillaume Hoffmann <guillaumh@gmail.com>
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import errno
import os
import re
import shutil
import stat
import subprocess
import sys
import tempfile
from collections import defaultdict
from . import _vc

class Vc(_vc.Vc):

# Requires Darcs version >= 2.10.3
# TODO implement get_commits_to_push_summary using `darcs push --dry-run`
# Currently `darcs whatsnew` (as of v2.10.3) does not report conflicts
# see http://bugs.darcs.net/issue2138

    CMD = "darcs"
    NAME = "Darcs"
    VC_DIR = "_darcs"

    state_map = {
        "a": _vc.STATE_NONE,
        "A": _vc.STATE_NEW,
        "M": _vc.STATE_MODIFIED,
        "M!": _vc.STATE_CONFLICT,
        "R": _vc.STATE_REMOVED,
        "F": _vc.STATE_NONEXIST,  # previous name of file
        "T": _vc.STATE_RENAMED,   # new name of file
    }

    @classmethod
    def is_installed(cls):
        try:
            proc = _vc.popen([cls.CMD, '--version'])
            # check that version >= 2.10.3
            (x,y,z) = proc.read().split(" ", 1)[0].split(".", 2)[:3]
            assert (x,y,z) >= (2,10,3)
            return True
        except Exception:
            return False

    def commit(self, runner, files, message):
        command = [self.CMD, 'record', '-a', '-m', message]
        runner(command, [], refresh=True, working_dir=self.root)

    def update(self, runner):
        command = [self.CMD, 'pull', '-a']
        runner(command, [], refresh=True, working_dir=self.root)

    def push(self, runner):
        command = [self.CMD, 'push', '-a']
        runner(command, [], refresh=True, working_dir=self.root)

    def add(self, runner, files):
        command = [self.CMD, 'add', '-r']
        runner(command, files, refresh=True, working_dir=self.root)

    def remove(self, runner, files):
        command = [self.CMD, 'remove', '-r']
        runner(command, files, refresh=True, working_dir=self.root)

    def revert(self, runner, files):
        command = [self.CMD, 'revert', '-a']
        runner(command, files, refresh=True, working_dir=self.root)

    def get_path_for_repo_file(self, path, commit=None):
        if commit is not None:
            raise NotImplementedError()

        if not path.startswith(self.root + os.path.sep):
            raise _vc.InvalidVCPath(self, path, "Path not in repository")

        # `darcs show contents` needs the path before rename
        if path in self._reverse_rename_cache:
            path = self._reverse_rename_cache[path]

        path = path[len(self.root) + 1:]
        process = subprocess.Popen([self.CMD, "show", "contents", path], cwd=self.root,
                                   stdout=subprocess.PIPE,
                                   stderr=subprocess.PIPE)

        with tempfile.NamedTemporaryFile(prefix='meld-tmp', delete=False) as f:
            shutil.copyfileobj(process.stdout, f)
        return f.name

    @classmethod
    def valid_repo(cls, path):
        return not _vc.call([cls.CMD, "show", "repo", "--no-files"], cwd=path)

    def _update_tree_state_cache(self, path):
        # FIXME: currently ignoring 'path' due to darcs's bad
        #        behaviour (= fails) when given "" argument
        """ Update the state of the file(s) at self._tree_cache['path'] """
        while 1:
            try:
                proc = _vc.popen([self.CMD, "whatsnew" , "-sl", "--machine-readable"],
                                 cwd=self.location)
                lines = proc.read().split("\n")[:-1]
                break
            except OSError as e:
                if e.errno != errno.EAGAIN:
                    raise

        # Files can appear twice in the list if were modified and renamed
        # at once. Darcs first show file moves then modifications.
        if len(lines) == 0 and os.path.isfile(path):
            # If we're just updating a single file there's a chance that it
            # was it was previously modified, and now has been edited so that
            # it is un-modified.  This will result in an empty 'entries' list,
            # and self._tree_cache['path'] will still contain stale data.
            # When this corner case occurs we force self._tree_cache['path']
            # to STATE_NORMAL.
            self._tree_cache[path] = _vc.STATE_NORMAL
        else:
            tree_cache = defaultdict(int)
            tree_meta_cache = defaultdict(list)
            self._rename_cache = rename_cache = {}
            self._reverse_rename_cache = {}
            old_name = None
            for line in lines:
                # skip empty lines and line starting with "What's new in foo"
                if (not line.strip()) or line.startswith("What"):
                    continue
                statekey, name = line.split(" ", 1)
                name = os.path.normpath(name)
                if statekey == "F":
                    old_name = name

                path = os.path.join(self.location, name)

                if statekey == "T" and old_name:
                    old_path = os.path.join(self.location, old_name)
                    rename_cache[old_path] = path
                    old_name = None

                state = self.state_map.get(statekey.strip(), _vc.STATE_NONE)
                tree_cache[path] = state

            for old, new in rename_cache.items():
                self._reverse_rename_cache[new] = old
                old_name = old[len(self.root) + 1:]
                new_name = new[len(self.root) + 1:]
                tree_meta_cache[new] = ("%s ➡ %s" % (old_name, new_name))

            self._tree_cache.update(
                dict((x, y) for x, y in tree_cache.items()))
            self._tree_meta_cache = dict(tree_meta_cache)