~bzr-pqm/bzr/bzr.dev

# Bazaar-NG -- distributed version control

# Copyright (C) 2005 by Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Commit message editor support."""

import os

from subprocess import call

from bzrlib.errors import BzrError

def _get_editor():

    """Return a sequence of possible editor binaries for the current platform"""

    from bzrlib.osutils import _read_config_value

    try:

        yield os.environ["BZR_EDITOR"]

    except KeyError:

        pass

    e = _read_config_value("editor")

    if e is not None:

        yield e

    try:

        yield os.environ["EDITOR"]

    except KeyError:

        pass

    if os.name == "nt":

        yield "notepad.exe"

    elif os.name == "posix":

        yield "/usr/bin/vi"

def _run_editor(filename):

    """Try to execute an editor to edit the commit message."""

    for e in _get_editor():

        edargs = e.split(' ')

        x = call(edargs + [filename])

        if x == 0:

            return True

        elif x == 127:

            continue

        else:

            break

    raise BzrError("Could not start any editor. "

                   "Please specify $EDITOR or use ~/.bzr.conf/editor")

def edit_commit_message(infotext, ignoreline=None):

    """Let the user edit a commit message in a temp file.

    This is run if they don't give a message or

    message-containing file on the command line.

    infotext:

        Text to be displayed at bottom of message for

        the user's reference; currently similar to

        'bzr status'.

    """

    import tempfile

    if ignoreline is None:

        ignoreline = "-- This line and the following will be ignored --"

    try:

        tmp_fileno, msgfilename = tempfile.mkstemp()

        msgfile = os.close(tmp_fileno)

        if infotext is not None and infotext != "":

            hasinfo = True

            msgfile = file(msgfilename, "w")

            msgfile.write("\n\n%s\n\n%s" % (ignoreline, infotext))

            msgfile.close()

        else:

            hasinfo = False

        if not _run_editor(msgfilename):

            return None

        started = False

        msg = []

        lastline, nlines = 0, 0

        for line in file(msgfilename, "r"):

            stripped_line = line.strip()

            # strip empty line before the log message starts

            if not started:

                if stripped_line != "":

                    started = True

                else:

                    continue

            # check for the ignore line only if there

            # is additional information at the end

            if hasinfo and stripped_line == ignoreline:

                break

            nlines += 1

            # keep track of the last line that had some content

            if stripped_line != "":

                lastline = nlines

            msg.append(line)

        if len(msg) == 0:

            return None

        # delete empty lines at the end

        del msg[lastline:]

        # add a newline at the end, if needed

        if not msg[-1].endswith("\n"):

            return "%s%s" % ("".join(msg), "\n")

        else:

            return "".join(msg)

    finally:

        # delete the msg file in any case

        try: os.unlink(msgfilename)

        except IOError: pass