# 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, incorporated herein by reference.

'''interactive change selection during commit'''

from mercurial.i18n import _

from mercurial import cmdutil, commands, cmdutil, hg, mdiff, patch, revlog

from mercurial import util

import copy, cStringIO, errno, operator, os, re, shutil, tempfile

lines_re = re.compile(r'@@ -(\d+),(\d+) \+(\d+),(\d+) @@\s*(.*)')

def scanpatch(fp):

    lr = patch.linereader(fp)

    def scanwhile(first, p):

        lines = [first]

        while True:

            line = lr.readline()

            if not line:

                break

            if p(line):

                lines.append(line)

            else:

                lr.push(line)

                break

        return lines

    while True:

        line = lr.readline()

        if not line:

            break

        if line.startswith('diff --git a/'):

            def notheader(line):

                s = line.split(None, 1)

                return not s or s[0] not in ('---', 'diff')

            header = scanwhile(line, notheader)

            fromfile = lr.readline()

            if fromfile.startswith('---'):

                tofile = lr.readline()

                header += [fromfile, tofile]

            else:

                lr.push(fromfile)

            yield 'file', header

        elif line[0] == ' ':

            yield 'context', scanwhile(line, lambda l: l[0] in ' \\')

        elif line[0] in '-+':

            yield 'hunk', scanwhile(line, lambda l: l[0] in '-+\\')

        else:

            m = lines_re.match(line)

            if m:

                yield 'range', m.groups()

            else:

                raise patch.PatchError('unknown patch content: %r' % line)

class header(object):

    diff_re = re.compile('diff --git a/(.*) b/(.*)$')

    allhunks_re = re.compile('(?:index|new file|deleted file) ')

    pretty_re = re.compile('(?:new file|deleted file) ')

    special_re = re.compile('(?:index|new|deleted|copy|rename) ')

    def __init__(self, header):

        self.header = header

        self.hunks = []

    def binary(self):

        for h in self.header:

            if h.startswith('index '):

                return True

    def pretty(self, fp):

        for h in self.header:

            if h.startswith('index '):

                fp.write(_('this modifies a binary file (all or nothing)\n'))

                break

            if self.pretty_re.match(h):

                fp.write(h)

                if self.binary():

                    fp.write(_('this is a binary file\n'))

                break

            if h.startswith('---'):

                fp.write(_('%d hunks, %d lines changed\n') %

                         (len(self.hunks),

                          sum([h.added + h.removed for h in self.hunks])))

                break

            fp.write(h)

    def write(self, fp):

        fp.write(''.join(self.header))

    def allhunks(self):

        for h in self.header:

            if self.allhunks_re.match(h):

                return True

    def files(self):

        fromfile, tofile = self.diff_re.match(self.header[0]).groups()

        if fromfile == tofile:

            return [fromfile]

        return [fromfile, tofile]

    def filename(self):

        return self.files()[-1]

    def __repr__(self):

        return '<header %s>' % (' '.join(map(repr, self.files())))

    def special(self):

        for h in self.header:

            if self.special_re.match(h):

                return True

def countchanges(hunk):

    add = len([h for h in hunk if h[0] == '+'])

    rem = len([h for h in hunk if h[0] == '-'])

    return add, rem

class hunk(object):

    maxcontext = 3

    def __init__(self, header, fromline, toline, proc, before, hunk, after):

        def trimcontext(number, lines):

            delta = len(lines) - self.maxcontext

            if False and delta > 0:

                return number + delta, lines[:self.maxcontext]

            return number, lines

        self.header = header

        self.fromline, self.before = trimcontext(fromline, before)

        self.toline, self.after = trimcontext(toline, after)

        self.proc = proc

        self.hunk = hunk

        self.added, self.removed = countchanges(self.hunk)

    def write(self, fp):

        delta = len(self.before) + len(self.after)

        fromlen = delta + self.removed

        tolen = delta + self.added

        fp.write('@@ -%d,%d +%d,%d @@%s\n' %

                 (self.fromline, fromlen, self.toline, tolen,

                  self.proc and (' ' + self.proc)))

        fp.write(''.join(self.before + self.hunk + self.after))

    pretty = write

    def filename(self):

        return self.header.filename()

    def __repr__(self):

        return '<hunk %r@%d>' % (self.filename(), self.fromline)

def parsepatch(fp):

    class parser(object):

        def __init__(self):

            self.fromline = 0

            self.toline = 0

            self.proc = ''

            self.header = None

            self.context = []

            self.before = []

            self.hunk = []

            self.stream = []

        def addrange(self, (fromstart, fromend, tostart, toend, proc)):

            self.fromline = int(fromstart)

            self.toline = int(tostart)

            self.proc = proc

        def addcontext(self, context):

            if self.hunk:

                h = hunk(self.header, self.fromline, self.toline, self.proc,

                         self.before, self.hunk, context)

                self.header.hunks.append(h)

                self.stream.append(h)

                self.fromline += len(self.before) + h.removed

                self.toline += len(self.before) + h.added

                self.before = []

                self.hunk = []

                self.proc = ''

            self.context = context

        def addhunk(self, hunk):

            if self.context:

                self.before = self.context

                self.context = []

            self.hunk = data

        def newfile(self, hdr):

            self.addcontext([])

            h = header(hdr)

            self.stream.append(h)

            self.header = h

        def finished(self):

            self.addcontext([])

            return self.stream

        transitions = {

            'file': {'context': addcontext,

                     'file': newfile,

                     'hunk': addhunk,

                     'range': addrange},

            'context': {'file': newfile,

                        'hunk': addhunk,

                        'range': addrange},

            'hunk': {'context': addcontext,

                     'file': newfile,

                     'range': addrange},

            'range': {'context': addcontext,

                      'hunk': addhunk},

            }

    p = parser()

    state = 'context'

    for newstate, data in scanpatch(fp):

        try:

            p.transitions[state][newstate](p, data)

        except KeyError:

            raise patch.PatchError('unhandled transition: %s -> %s' %

                                   (state, newstate))

        state = newstate

    return p.finished()

def filterpatch(ui, chunks):

    chunks = list(chunks)

    chunks.reverse()

    seen = {}

    def consumefile():

        consumed = []

        while chunks:

            if isinstance(chunks[-1], header):

                break

            else:

                consumed.append(chunks.pop())

        return consumed

    applied = {}

    while chunks:

        chunk = chunks.pop()

        if isinstance(chunk, header):

            fixoffset = 0

            hdr = ''.join(chunk.header)

            if hdr in seen:

                consumefile()

                continue

            seen[hdr] = True

                chunk.pretty(ui)

                applied[chunk.filename()] = [chunk]

                if chunk.allhunks():

                    applied[chunk.filename()] += consumefile()

            else:

                consumefile()

        else:

                chunk.pretty(ui)

                if fixoffset:

                    chunk = copy.copy(chunk)

                    chunk.toline += fixoffset

                applied[chunk.filename()].append(chunk)

            else:

                fixoffset += chunk.removed - chunk.added

    return reduce(operator.add, [h for h in applied.itervalues()

                                 if h[0].special() or len(h) > 1], [])

def record(ui, repo, *pats, **opts):

    if not ui.interactive:

        raise util.Abort(_('running non-interactively, use commit instead'))

    def recordfunc(ui, repo, files, message, match, opts):

        if files:

            changes = None

        else:

            changes = repo.status(files=files, match=match)[:5]

            modified, added, removed = changes[:3]

            files = modified + added + removed

        diffopts = mdiff.diffopts(git=True, nodates=True)

        fp = cStringIO.StringIO()

        patch.diff(repo, repo.dirstate.parents()[0], files=files,

                   match=match, changes=changes, opts=diffopts, fp=fp)

        fp.seek(0)

        chunks = filterpatch(ui, parsepatch(fp))

        del fp

        contenders = {}

        for h in chunks:

            try: contenders.update(dict.fromkeys(h.files()))

            except AttributeError: pass

        newfiles = [f for f in files if f in contenders]

        if not newfiles:

            ui.status(_('no changes to record\n'))

            return 0

        if changes is None:

            changes = repo.status(files=newfiles, match=match)[:5]

        modified = dict.fromkeys(changes[0])

        backups = {}

        backupdir = repo.join('record-backups')

        try:

            os.mkdir(backupdir)

        except OSError, err:

            if err.errno != errno.EEXIST:

                raise

        try:

            for f in newfiles:

                if f not in modified:

                    continue

                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)

                backups[f] = tmpname

            fp = cStringIO.StringIO()