record: some docs
While studing record, I've written some docstrings and comments.
Hope they are useful.
# 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):
"""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)
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 = 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):
"""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:
r = (ui.prompt(query + _(' [Ynsfdaq?] '), '(?i)[Ynsfdaq?]?$')
or 'y').lower()
if r == '?':
c = record.__doc__.find('y - record this change')
for l in record.__doc__[c:].splitlines():
if l: ui.write(_(l.strip()), '\n')
continue
elif r == 's':
r = resp_file[0] = 'n'
elif r == 'f':
r = resp_file[0] = 'y'
elif r == 'd':
r = resp_all[0] = 'n'
elif r == 'a':
r = resp_all[0] = 'y'
elif r == 'q':
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())))
if r == 'y':
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 r == 'y':
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.
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'''
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()
for c in chunks:
if c.filename() in backups:
c.write(fp)
dopatch = fp.tell()
fp.seek(0)
if backups:
hg.revert(repo, repo.dirstate.parents()[0], backups.has_key)
if dopatch:
ui.debug('applying patch\n')
ui.debug(fp.getvalue())
patch.internalpatch(fp, ui, 1, repo.root)
del fp
repo.commit(newfiles, message, opts['user'], opts['date'], match,
force_editor=opts.get('force_editor'))
return 0
finally:
try:
for realname, tmpname in backups.iteritems():
ui.debug('restoring %r to %r\n' % (tmpname, realname))
util.copyfile(tmpname, repo.wjoin(realname))
os.unlink(tmpname)
os.rmdir(backupdir)
except OSError:
pass
return cmdutil.commit(ui, repo, recordfunc, pats, opts)
cmdtable = {
"record":
(record,
[('A', 'addremove', None,
_('mark new/missing files as added/removed before committing')),
] + commands.walkopts + commands.commitopts + commands.commitopts2,
_('hg record [OPTION]... [FILE]...')),
}