# record.py
#
# Copyright 2007 Bryan O'Sullivan <bos@serpentine.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''commands to interactively select changes for commit/qrefresh'''

from mercurial.i18n import _
from mercurial import cmdutil, commands, extensions, patch
from mercurial import util
from mercurial import merge as mergemod
import cStringIO, errno, os, shutil, tempfile

cmdtable = {}
command = cmdutil.command(cmdtable)
testedwith = 'internal'


@command("record",
         # same options as commit + white space diff options
         commands.table['^commit|ci'][1][:] + commands.diffwsopts,
          _('hg record [OPTION]... [FILE]...'))
def record(ui, repo, *pats, **opts):
    '''interactively select changes to commit

    If a list of files is omitted, all changes reported by :hg:`status`
    will be candidates for recording.

    See :hg:`help dates` for a list of formats valid for -d/--date.

    You will be prompted for whether to record changes to each
    modified file, and for files with multiple changes, for each
    change to use. For each query, the following responses are
    possible::

      y - record this change
      n - skip this change
      e - edit this change manually

      s - skip remaining changes to this file
      f - record remaining changes to this file

      d - done, skip remaining changes and files
      a - record all changes to all remaining files
      q - quit, recording no changes

      ? - display help

    This command is not available when committing a merge.'''

    dorecord(ui, repo, commands.commit, 'commit', False, *pats, **opts)

def qrefresh(origfn, ui, repo, *pats, **opts):
    if not opts['interactive']:
        return origfn(ui, repo, *pats, **opts)

    mq = extensions.find('mq')

    def committomq(ui, repo, *pats, **opts):
        # At this point the working copy contains only changes that
        # were accepted. All other changes were reverted.
        # We can't pass *pats here since qrefresh will undo all other
        # changed files in the patch that aren't in pats.
        mq.refresh(ui, repo, **opts)

    # backup all changed files
    dorecord(ui, repo, committomq, 'qrefresh', True, *pats, **opts)

# This command registration is replaced during uisetup().
@command('qrecord',
    [],
    _('hg qrecord [OPTION]... PATCH [FILE]...'),
    inferrepo=True)
def qrecord(ui, repo, patch, *pats, **opts):
    '''interactively record a new patch

    See :hg:`help qnew` & :hg:`help record` for more information and
    usage.
    '''

    try:
        mq = extensions.find('mq')
    except KeyError:
        raise util.Abort(_("'mq' extension not loaded"))

    repo.mq.checkpatchname(patch)

    def committomq(ui, repo, *pats, **opts):
        opts['checkname'] = False
        mq.new(ui, repo, patch, *pats, **opts)

    dorecord(ui, repo, committomq, 'qnew', False, *pats, **opts)

def qnew(origfn, ui, repo, patch, *args, **opts):
    if opts['interactive']:
        return qrecord(ui, repo, patch, *args, **opts)
    return origfn(ui, repo, patch, *args, **opts)

def dorecord(ui, repo, commitfunc, cmdsuggest, backupall, *pats, **opts):
    if not ui.interactive():
        raise util.Abort(_('running non-interactively, use %s instead') %
                         cmdsuggest)

    # make sure username is set before going interactive
    if not opts.get('user'):
        ui.username() # raise exception, username not provided

    def recordfunc(ui, repo, message, match, opts):
        """This is generic record driver.

        Its job is to interactively filter local changes, and
        accordingly prepare working directory into a state in which the
        job can be delegated to a non-interactive commit command such as
        'commit' or 'qrefresh'.

        After the actual job is done by non-interactive command, the
        working directory is restored to its original state.

        In the end we'll record interesting changes, and everything else
        will be left in place, so the user can continue working.
        """

        cmdutil.checkunfinished(repo, commit=True)
        merge = len(repo[None].parents()) > 1
        if merge:
            raise util.Abort(_('cannot partially commit a merge '
                               '(use "hg commit" instead)'))

        status = repo.status(match=match)
        diffopts = patch.difffeatureopts(ui, opts=opts, whitespace=True)
        diffopts.nodates = True
        diffopts.git = True
        originalchunks = patch.diff(repo, changes=status, opts=diffopts)
        fp = cStringIO.StringIO()
        fp.write(''.join(originalchunks))
        fp.seek(0)

        # 1. filter patch, so we have intending-to apply subset of it
        try:
            chunks = patch.filterpatch(ui, patch.parsepatch(fp))
        except patch.PatchError, err:
            raise util.Abort(_('error parsing patch: %s') % err)

        del fp

        contenders = set()
        for h in chunks:
            try:
                contenders.update(set(h.files()))
            except AttributeError:
                pass

        changed = status.modified + status.added + status.removed
        newfiles = [f for f in changed if f in contenders]
        if not newfiles:
            ui.status(_('no changes to record\n'))
            return 0

        newandmodifiedfiles = set()
        for h in chunks:
            ishunk = isinstance(h, patch.recordhunk)
            isnew = h.filename() in status.added
            if ishunk and isnew and not h in originalchunks:
                newandmodifiedfiles.add(h.filename())

        modified = set(status.modified)

        # 2. backup changed files, so we can restore them in the end

        if backupall:
            tobackup = changed
        else:
            tobackup = [f for f in newfiles
                        if f in modified or f in newandmodifiedfiles]

        backups = {}
        if tobackup:
            backupdir = repo.join('record-backups')
            try:
                os.mkdir(backupdir)
            except OSError, err:
                if err.errno != errno.EEXIST:
                    raise
        try:
            # backup continues
            for f in tobackup:
                fd, tmpname = tempfile.mkstemp(prefix=f.replace('/', '_')+'.',
                                               dir=backupdir)
                os.close(fd)
                ui.debug('backup %r as %r\n' % (f, tmpname))
                util.copyfile(repo.wjoin(f), tmpname)
                shutil.copystat(repo.wjoin(f), tmpname)
                backups[f] = tmpname

            fp = cStringIO.StringIO()
            for c in chunks:
                fname = c.filename()
                if fname in backups or fname in newandmodifiedfiles:
                    c.write(fp)
            dopatch = fp.tell()
            fp.seek(0)

            [os.unlink(c) for c in newandmodifiedfiles]

            # 3a. apply filtered patch to clean repo  (clean)
            if backups:
                # Equivalent to hg.revert
                choices = lambda key: key in backups
                mergemod.update(repo, repo.dirstate.p1(),
                        False, True, choices)

            # 3b. (apply)
            if dopatch:
                try:
                    ui.debug('applying patch\n')
                    ui.debug(fp.getvalue())
                    patch.internalpatch(ui, repo, fp, 1, eolmode=None)
                except patch.PatchError, err:
                    raise util.Abort(str(err))
            del fp

            # 4. We prepared working directory according to filtered
            #    patch. Now is the time to delegate the job to
            #    commit/qrefresh or the like!

            # Make all of the pathnames absolute.
            newfiles = [repo.wjoin(nf) for nf in newfiles]
            commitfunc(ui, repo, *newfiles, **opts)

            return 0
        finally:
            # 5. finally restore backed-up files
            try:
                for realname, tmpname in backups.iteritems():
                    ui.debug('restoring %r to %r\n' % (tmpname, realname))
                    util.copyfile(tmpname, repo.wjoin(realname))
                    # Our calls to copystat() here and above are a
                    # hack to trick any editors that have f open that
                    # we haven't modified them.
                    #
                    # Also note that this racy as an editor could
                    # notice the file's mtime before we've finished
                    # writing it.
                    shutil.copystat(tmpname, repo.wjoin(realname))
                    os.unlink(tmpname)
                if tobackup:
                    os.rmdir(backupdir)
            except OSError:
                pass

    # wrap ui.write so diff output can be labeled/colorized
    def wrapwrite(orig, *args, **kw):
        label = kw.pop('label', '')
        for chunk, l in patch.difflabel(lambda: args):
            orig(chunk, label=label + l)
    oldwrite = ui.write

    def wrap(*args, **kwargs):
        return wrapwrite(oldwrite, *args, **kwargs)
    setattr(ui, 'write', wrap)

    try:
        return cmdutil.commit(ui, repo, recordfunc, pats, opts)
    finally:
        ui.write = oldwrite

def uisetup(ui):
    try:
        mq = extensions.find('mq')
    except KeyError:
        return

    cmdtable["qrecord"] = \
        (qrecord,
         # same options as qnew, but copy them so we don't get
         # -i/--interactive for qrecord and add white space diff options
         mq.cmdtable['^qnew'][1][:] + commands.diffwsopts,
         _('hg qrecord [OPTION]... PATCH [FILE]...'))

    _wrapcmd('qnew', mq.cmdtable, qnew, _("interactively record a new patch"))
    _wrapcmd('qrefresh', mq.cmdtable, qrefresh,
             _("interactively select changes to refresh"))

def _wrapcmd(cmd, table, wrapfn, msg):
    entry = extensions.wrapcommand(table, cmd, wrapfn)
    entry[1].append(('i', 'interactive', None, msg))