# 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 or qrefresh'''

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

from mercurial import util

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

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

def scanpatch(fp):

    """like patch.iterhunks, but yield different events

    - ('file',    [header_lines + fromfile + tofile])

    - ('context', [context_lines])

    - ('hunk',    [hunk_lines])

    - ('range',   (-start,len, +start,len, diffp))

    """

    lr = patch.linereader(fp)

    def scanwhile(first, p):

        """scan lr while predicate holds"""

        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):

    """patch header

    XXX shoudn't we move this to mercurial/patch.py ?

    """

    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):

    """hunk -> (n+,n-)"""

    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):

    """patch hunk

    XXX shouldn't we merge this with patch.hunk ?

    """

    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)

        if self.after and self.after[-1] == '\\ No newline at end of file\n':

            delta -= 1

        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):

    """patch -> [] of hunks """

    class parser(object):

        """patch parsing state machine"""

        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 = hunk

        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):

    """Interactively filter patch chunks into applied-only chunks"""

    chunks = list(chunks)

    chunks.reverse()

    seen = {}

    def consumefile():

        """fetch next portion from chunks until a 'header' is seen

        NB: header == new-file mark

        """

        consumed = []

        while chunks:

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

                break

            else:

                consumed.append(chunks.pop())

        return consumed

    resp_all = [None]   # this two are changed from inside prompt,

    resp_file = [None]  # so can't be usual variables

    applied = {}        # 'filename' -> [] of chunks

    def prompt(query):

        """prompt query, and process base inputs

        - y/n for the rest of file

        - y/n for the rest

        - ? (help)

        - q (quit)

        else, input is returned to the caller.

        """

        if resp_all[0] is not None:

            return resp_all[0]

        if resp_file[0] is not None:

            return resp_file[0]

        while True:

                continue

                r = resp_file[0] = 'n'

                r = resp_file[0] = 'y'

                r = resp_all[0] = 'n'

                r = resp_all[0] = 'y'

                raise util.Abort(_('user quit'))

            return r

    while chunks:

        chunk = chunks.pop()

        if isinstance(chunk, header):

            # new-file mark

            resp_file = [None]

            fixoffset = 0

            hdr = ''.join(chunk.header)

            if hdr in seen:

                consumefile()

                continue

            seen[hdr] = True

            if resp_all[0] is None:

                chunk.pretty(ui)

            r = prompt(_('examine changes to %s?') %

                       _(' and ').join(map(repr, chunk.files())))

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

                if chunk.allhunks():

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

            else:

                consumefile()

        else:

            # new hunk

            if resp_file[0] is None and resp_all[0] is None:

                chunk.pretty(ui)

            r = prompt(_('record this change to %r?') %

                       chunk.filename())

                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):

    '''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

    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'''

    def record_committer(ui, repo, pats, opts):

        commands.commit(ui, repo, *pats, **opts)

    dorecord(ui, repo, record_committer, *pats, **opts)

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"))