Merge with stable

mercurial/patch.py

@@ -1,1694 +1,1697 b''
 # patch.py - patch file parsing routines
 #
 # Copyright 2006 Brendan Cully <[e-mail]>
 # Copyright 2007 Chris Mason <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
 from node import hex, nullid, short
 import base85, cmdutil, mdiff, util, diffhelpers, copies
 import cStringIO, email.Parser, os, re
 import sys, tempfile, zlib
 
 gitre = re.compile('diff --git a/(.*) b/(.*)')
 
 class PatchError(Exception):
     pass
 
 class NoHunks(PatchError):
     pass
 
 # helper functions
 
 def copyfile(src, dst, basedir):
     abssrc, absdst = [util.canonpath(basedir, basedir, x) for x in [src, dst]]
     if os.path.exists(absdst):
         raise util.Abort(_("cannot create %s: destination already exists") %
                          dst)
 
     dstdir = os.path.dirname(absdst)
     if dstdir and not os.path.isdir(dstdir):
         try:
             os.makedirs(dstdir)
         except IOError:
             raise util.Abort(
                 _("cannot create %s: unable to create destination directory")
                 % dst)
 
     util.copyfile(abssrc, absdst)
 
 # public functions
 
 def split(stream):
     '''return an iterator of individual patches from a stream'''
     def isheader(line, inheader):
         if inheader and line[0] in (' ', '\t'):
             # continuation
             return True
+        if line[0] in (' ', '-', '+'):
+            # diff line - don't check for header pattern in there
+            return False
         l = line.split(': ', 1)
         return len(l) == 2 and ' ' not in l[0]
 
     def chunk(lines):
         return cStringIO.StringIO(''.join(lines))
 
     def hgsplit(stream, cur):
         inheader = True
 
         for line in stream:
             if not line.strip():
                 inheader = False
             if not inheader and line.startswith('# HG changeset patch'):
                 yield chunk(cur)
                 cur = []
                 inheader = True
 
             cur.append(line)
 
         if cur:
             yield chunk(cur)
 
     def mboxsplit(stream, cur):
         for line in stream:
             if line.startswith('From '):
                 for c in split(chunk(cur[1:])):
                     yield c
                 cur = []
 
             cur.append(line)
 
         if cur:
             for c in split(chunk(cur[1:])):
                 yield c
 
     def mimesplit(stream, cur):
         def msgfp(m):
             fp = cStringIO.StringIO()
             g = email.Generator.Generator(fp, mangle_from_=False)
             g.flatten(m)
             fp.seek(0)
             return fp
 
         for line in stream:
             cur.append(line)
         c = chunk(cur)
 
         m = email.Parser.Parser().parse(c)
         if not m.is_multipart():
             yield msgfp(m)
         else:
             ok_types = ('text/plain', 'text/x-diff', 'text/x-patch')
             for part in m.walk():
                 ct = part.get_content_type()
                 if ct not in ok_types:
                     continue
                 yield msgfp(part)
 
     def headersplit(stream, cur):
         inheader = False
 
         for line in stream:
             if not inheader and isheader(line, inheader):
                 yield chunk(cur)
                 cur = []
                 inheader = True
             if inheader and not isheader(line, inheader):
                 inheader = False
 
             cur.append(line)
 
         if cur:
             yield chunk(cur)
 
     def remainder(cur):
         yield chunk(cur)
 
     class fiter(object):
         def __init__(self, fp):
             self.fp = fp
 
         def __iter__(self):
             return self
 
         def next(self):
             l = self.fp.readline()
             if not l:
                 raise StopIteration
             return l
 
     inheader = False
     cur = []
 
     mimeheaders = ['content-type']
 
     if not hasattr(stream, 'next'):
         # http responses, for example, have readline but not next
         stream = fiter(stream)
 
     for line in stream:
         cur.append(line)
         if line.startswith('# HG changeset patch'):
             return hgsplit(stream, cur)
         elif line.startswith('From '):
             return mboxsplit(stream, cur)
         elif isheader(line, inheader):
             inheader = True
             if line.split(':', 1)[0].lower() in mimeheaders:
                 # let email parser handle this
                 return mimesplit(stream, cur)
         elif line.startswith('--- ') and inheader:
             # No evil headers seen by diff start, split by hand
             return headersplit(stream, cur)
         # Not enough info, keep reading
 
     # if we are here, we have a very plain patch
     return remainder(cur)
 
 def extract(ui, fileobj):
     '''extract patch from data read from fileobj.
 
     patch can be a normal patch or contained in an email message.
 
     return tuple (filename, message, user, date, node, p1, p2).
     Any item in the returned tuple can be None. If filename is None,
     fileobj did not contain a patch. Caller must unlink filename when done.'''
 
     # attempt to detect the start of a patch
     # (this heuristic is borrowed from quilt)
     diffre = re.compile(r'^(?:Index:[ \t]|diff[ \t]|RCS file: |'
                         r'retrieving revision [0-9]+(\.[0-9]+)*$|'
                         r'---[ \t].*?^\+\+\+[ \t]|'
                         r'\*\*\*[ \t].*?^---[ \t])', re.MULTILINE|re.DOTALL)
 
     fd, tmpname = tempfile.mkstemp(prefix='hg-patch-')
     tmpfp = os.fdopen(fd, 'w')
     try:
         msg = email.Parser.Parser().parse(fileobj)
 
         subject = msg['Subject']
         user = msg['From']
         if not subject and not user:
             # Not an email, restore parsed headers if any
             subject = '\n'.join(': '.join(h) for h in msg.items()) + '\n'
 
         gitsendmail = 'git-send-email' in msg.get('X-Mailer', '')
         # should try to parse msg['Date']
         date = None
         nodeid = None
         branch = None
         parents = []
 
         if subject:
             if subject.startswith('[PATCH'):
                 pend = subject.find(']')
                 if pend >= 0:
                     subject = subject[pend + 1:].lstrip()
             subject = subject.replace('\n\t', ' ')
             ui.debug('Subject: %s\n' % subject)
         if user:
             ui.debug('From: %s\n' % user)
         diffs_seen = 0
         ok_types = ('text/plain', 'text/x-diff', 'text/x-patch')
         message = ''
         for part in msg.walk():
             content_type = part.get_content_type()
             ui.debug('Content-Type: %s\n' % content_type)
             if content_type not in ok_types:
                 continue
             payload = part.get_payload(decode=True)
             m = diffre.search(payload)
             if m:
                 hgpatch = False
                 ignoretext = False
 
                 ui.debug('found patch at byte %d\n' % m.start(0))
                 diffs_seen += 1
                 cfp = cStringIO.StringIO()
                 for line in payload[:m.start(0)].splitlines():
                     if line.startswith('# HG changeset patch'):
                         ui.debug('patch generated by hg export\n')
                         hgpatch = True
                         # drop earlier commit message content
                         cfp.seek(0)
                         cfp.truncate()
                         subject = None
                     elif hgpatch:
                         if line.startswith('# User '):
                             user = line[7:]
                             ui.debug('From: %s\n' % user)
                         elif line.startswith("# Date "):
                             date = line[7:]
                         elif line.startswith("# Branch "):
                             branch = line[9:]
                         elif line.startswith("# Node ID "):
                             nodeid = line[10:]
                         elif line.startswith("# Parent "):
                             parents.append(line[10:])
                     elif line == '---' and gitsendmail:
                         ignoretext = True
                     if not line.startswith('# ') and not ignoretext:
                         cfp.write(line)
                         cfp.write('\n')
                 message = cfp.getvalue()
                 if tmpfp:
                     tmpfp.write(payload)
                     if not payload.endswith('\n'):
                         tmpfp.write('\n')
             elif not diffs_seen and message and content_type == 'text/plain':
                 message += '\n' + payload
     except:
         tmpfp.close()
         os.unlink(tmpname)
         raise
 
     if subject and not message.startswith(subject):
         message = '%s\n%s' % (subject, message)
     tmpfp.close()
     if not diffs_seen:
         os.unlink(tmpname)
         return None, message, user, date, branch, None, None, None
     p1 = parents and parents.pop(0) or None
     p2 = parents and parents.pop(0) or None
     return tmpname, message, user, date, branch, nodeid, p1, p2
 
 GP_PATCH  = 1 << 0  # we have to run patch
 GP_FILTER = 1 << 1  # there's some copy/rename operation
 GP_BINARY = 1 << 2  # there's a binary patch
 
 class patchmeta(object):
     """Patched file metadata
 
     'op' is the performed operation within ADD, DELETE, RENAME, MODIFY
     or COPY.  'path' is patched file path. 'oldpath' is set to the
     origin file when 'op' is either COPY or RENAME, None otherwise. If
     file mode is changed, 'mode' is a tuple (islink, isexec) where
     'islink' is True if the file is a symlink and 'isexec' is True if
     the file is executable. Otherwise, 'mode' is None.
     """
     def __init__(self, path):
         self.path = path
         self.oldpath = None
         self.mode = None
         self.op = 'MODIFY'
         self.lineno = 0
         self.binary = False
 
     def setmode(self, mode):
         islink = mode & 020000
         isexec = mode & 0100
         self.mode = (islink, isexec)
 
 def readgitpatch(lr):
     """extract git-style metadata about patches from <patchname>"""
 
     # Filter patch for git information
     gp = None
     gitpatches = []
     # Can have a git patch with only metadata, causing patch to complain
     dopatch = 0
 
     lineno = 0
     for line in lr:
         lineno += 1
         line = line.rstrip(' \r\n')
         if line.startswith('diff --git'):
             m = gitre.match(line)
             if m:
                 if gp:
                     gitpatches.append(gp)
                 dst = m.group(2)
                 gp = patchmeta(dst)
                 gp.lineno = lineno
         elif gp:
             if line.startswith('--- '):
                 if gp.op in ('COPY', 'RENAME'):
                     dopatch |= GP_FILTER
                 gitpatches.append(gp)
                 gp = None
                 dopatch |= GP_PATCH
                 continue
             if line.startswith('rename from '):
                 gp.op = 'RENAME'
                 gp.oldpath = line[12:]
             elif line.startswith('rename to '):
                 gp.path = line[10:]
             elif line.startswith('copy from '):
                 gp.op = 'COPY'
                 gp.oldpath = line[10:]
             elif line.startswith('copy to '):
                 gp.path = line[8:]
             elif line.startswith('deleted file'):
                 gp.op = 'DELETE'
                 # is the deleted file a symlink?
                 gp.setmode(int(line[-6:], 8))
             elif line.startswith('new file mode '):
                 gp.op = 'ADD'
                 gp.setmode(int(line[-6:], 8))
             elif line.startswith('new mode '):
                 gp.setmode(int(line[-6:], 8))
             elif line.startswith('GIT binary patch'):
                 dopatch |= GP_BINARY
                 gp.binary = True
     if gp:
         gitpatches.append(gp)
 
     if not gitpatches:
         dopatch = GP_PATCH
 
     return (dopatch, gitpatches)
 
 class linereader(object):
     # simple class to allow pushing lines back into the input stream
     def __init__(self, fp, textmode=False):
         self.fp = fp
         self.buf = []
         self.textmode = textmode
         self.eol = None
 
     def push(self, line):
         if line is not None:
             self.buf.append(line)
 
     def readline(self):
         if self.buf:
             l = self.buf[0]
             del self.buf[0]
             return l
         l = self.fp.readline()
         if not self.eol:
             if l.endswith('\r\n'):
                 self.eol = '\r\n'
             elif l.endswith('\n'):
                 self.eol = '\n'
         if self.textmode and l.endswith('\r\n'):
             l = l[:-2] + '\n'
         return l
 
     def __iter__(self):
         while 1:
             l = self.readline()
             if not l:
                 break
             yield l
 
 # @@ -start,len +start,len @@ or @@ -start +start @@ if len is 1
 unidesc = re.compile('@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))? @@')
 contextdesc = re.compile('(---|\*\*\*) (\d+)(,(\d+))? (---|\*\*\*)')
 eolmodes = ['strict', 'crlf', 'lf', 'auto']
 
 class patchfile(object):
     def __init__(self, ui, fname, opener, missing=False, eolmode='strict'):
         self.fname = fname
         self.eolmode = eolmode
         self.eol = None
         self.opener = opener
         self.ui = ui
         self.lines = []
         self.exists = False
         self.missing = missing
         if not missing:
             try:
                 self.lines = self.readlines(fname)
                 self.exists = True
             except IOError:
                 pass
         else:
             self.ui.warn(_("unable to find '%s' for patching\n") % self.fname)
 
         self.hash = {}
         self.dirty = 0
         self.offset = 0
         self.skew = 0
         self.rej = []
         self.fileprinted = False
         self.printfile(False)
         self.hunks = 0
 
     def readlines(self, fname):
         if os.path.islink(fname):
             return [os.readlink(fname)]
         fp = self.opener(fname, 'r')
         try:
             lr = linereader(fp, self.eolmode != 'strict')
             lines = list(lr)
             self.eol = lr.eol
             return lines
         finally:
             fp.close()
 
     def writelines(self, fname, lines):
         # Ensure supplied data ends in fname, being a regular file or
         # a symlink. updatedir() will -too magically- take care of
         # setting it to the proper type afterwards.
         islink = os.path.islink(fname)
         if islink:
             fp = cStringIO.StringIO()
         else:
             fp = self.opener(fname, 'w')
         try:
             if self.eolmode == 'auto':
                 eol = self.eol
             elif self.eolmode == 'crlf':
                 eol = '\r\n'
             else:
                 eol = '\n'
 
             if self.eolmode != 'strict' and eol and eol != '\n':
                 for l in lines:
                     if l and l[-1] == '\n':
                         l = l[:-1] + eol
                     fp.write(l)
             else:
                 fp.writelines(lines)
             if islink:
                 self.opener.symlink(fp.getvalue(), fname)
         finally:
             fp.close()
 
     def unlink(self, fname):
         os.unlink(fname)
 
     def printfile(self, warn):
         if self.fileprinted:
             return
         if warn or self.ui.verbose:
             self.fileprinted = True
         s = _("patching file %s\n") % self.fname
         if warn:
             self.ui.warn(s)
         else:
             self.ui.note(s)
 
 
     def findlines(self, l, linenum):
         # looks through the hash and finds candidate lines.  The
         # result is a list of line numbers sorted based on distance
         # from linenum
 
         cand = self.hash.get(l, [])
         if len(cand) > 1:
             # resort our list of potentials forward then back.
             cand.sort(key=lambda x: abs(x - linenum))
         return cand
 
     def hashlines(self):
         self.hash = {}
         for x, s in enumerate(self.lines):
             self.hash.setdefault(s, []).append(x)
 
     def write_rej(self):
         # our rejects are a little different from patch(1).  This always
         # creates rejects in the same form as the original patch.  A file
         # header is inserted so that you can run the reject through patch again
         # without having to type the filename.
 
         if not self.rej:
             return
 
         fname = self.fname + ".rej"
         self.ui.warn(
             _("%d out of %d hunks FAILED -- saving rejects to file %s\n") %
             (len(self.rej), self.hunks, fname))
 
         def rejlines():
             base = os.path.basename(self.fname)
             yield "--- %s\n+++ %s\n" % (base, base)
             for x in self.rej:
                 for l in x.hunk:
                     yield l
                     if l[-1] != '\n':
                         yield "\n\ No newline at end of file\n"
 
         self.writelines(fname, rejlines())
 
     def write(self, dest=None):
         if not self.dirty:
             return
         if not dest:
             dest = self.fname
         self.writelines(dest, self.lines)
 
     def close(self):
         self.write()
         self.write_rej()
 
     def apply(self, h):
         if not h.complete():
             raise PatchError(_("bad hunk #%d %s (%d %d %d %d)") %
                             (h.number, h.desc, len(h.a), h.lena, len(h.b),
                             h.lenb))
 
         self.hunks += 1
 
         if self.missing:
             self.rej.append(h)
             return -1
 
         if self.exists and h.createfile():
             self.ui.warn(_("file %s already exists\n") % self.fname)
             self.rej.append(h)
             return -1
 
         if isinstance(h, binhunk):
             if h.rmfile():
                 self.unlink(self.fname)
             else:
                 self.lines[:] = h.new()
                 self.offset += len(h.new())
                 self.dirty = 1
             return 0
 
         horig = h
         if (self.eolmode in ('crlf', 'lf')
             or self.eolmode == 'auto' and self.eol):
             # If new eols are going to be normalized, then normalize
             # hunk data before patching. Otherwise, preserve input
             # line-endings.
             h = h.getnormalized()
 
         # fast case first, no offsets, no fuzz
         old = h.old()
         # patch starts counting at 1 unless we are adding the file
         if h.starta == 0:
             start = 0
         else:
             start = h.starta + self.offset - 1
         orig_start = start
         # if there's skew we want to emit the "(offset %d lines)" even
         # when the hunk cleanly applies at start + skew, so skip the
         # fast case code
         if self.skew == 0 and diffhelpers.testhunk(old, self.lines, start) == 0:
             if h.rmfile():
                 self.unlink(self.fname)
             else:
                 self.lines[start : start + h.lena] = h.new()
                 self.offset += h.lenb - h.lena
                 self.dirty = 1
             return 0
 
         # ok, we couldn't match the hunk.  Lets look for offsets and fuzz it
         self.hashlines()
         if h.hunk[-1][0] != ' ':
             # if the hunk tried to put something at the bottom of the file
             # override the start line and use eof here
             search_start = len(self.lines)
         else:
             search_start = orig_start + self.skew
 
         for fuzzlen in xrange(3):
             for toponly in [True, False]:
                 old = h.old(fuzzlen, toponly)
 
                 cand = self.findlines(old[0][1:], search_start)
                 for l in cand:
                     if diffhelpers.testhunk(old, self.lines, l) == 0:
                         newlines = h.new(fuzzlen, toponly)
                         self.lines[l : l + len(old)] = newlines
                         self.offset += len(newlines) - len(old)
                         self.skew = l - orig_start
                         self.dirty = 1
                         offset = l - orig_start - fuzzlen
                         if fuzzlen:
                             msg = _("Hunk #%d succeeded at %d "
                                     "with fuzz %d "
                                     "(offset %d lines).\n")
                             self.printfile(True)
                             self.ui.warn(msg %
                                 (h.number, l + 1, fuzzlen, offset))
                         else:
                             msg = _("Hunk #%d succeeded at %d "
                                     "(offset %d lines).\n")
                             self.ui.note(msg % (h.number, l + 1, offset))
                         return fuzzlen
         self.printfile(True)
         self.ui.warn(_("Hunk #%d FAILED at %d\n") % (h.number, orig_start))
         self.rej.append(horig)
         return -1
 
 class hunk(object):
     def __init__(self, desc, num, lr, context, create=False, remove=False):
         self.number = num
         self.desc = desc
         self.hunk = [desc]
         self.a = []
         self.b = []
         self.starta = self.lena = None
         self.startb = self.lenb = None
         if lr is not None:
             if context:
                 self.read_context_hunk(lr)
             else:
                 self.read_unified_hunk(lr)
         self.create = create
         self.remove = remove and not create
 
     def getnormalized(self):
         """Return a copy with line endings normalized to LF."""
 
         def normalize(lines):
             nlines = []
             for line in lines:
                 if line.endswith('\r\n'):
                     line = line[:-2] + '\n'
                 nlines.append(line)
             return nlines
 
         # Dummy object, it is rebuilt manually
         nh = hunk(self.desc, self.number, None, None, False, False)
         nh.number = self.number
         nh.desc = self.desc
         nh.hunk = self.hunk
         nh.a = normalize(self.a)
         nh.b = normalize(self.b)
         nh.starta = self.starta
         nh.startb = self.startb
         nh.lena = self.lena
         nh.lenb = self.lenb
         nh.create = self.create
         nh.remove = self.remove
         return nh
 
     def read_unified_hunk(self, lr):
         m = unidesc.match(self.desc)
         if not m:
             raise PatchError(_("bad hunk #%d") % self.number)
         self.starta, foo, self.lena, self.startb, foo2, self.lenb = m.groups()
         if self.lena is None:
             self.lena = 1
         else:
             self.lena = int(self.lena)
         if self.lenb is None:
             self.lenb = 1
         else:
             self.lenb = int(self.lenb)
         self.starta = int(self.starta)
         self.startb = int(self.startb)
         diffhelpers.addlines(lr, self.hunk, self.lena, self.lenb, self.a, self.b)
         # if we hit eof before finishing out the hunk, the last line will
         # be zero length.  Lets try to fix it up.
         while len(self.hunk[-1]) == 0:
             del self.hunk[-1]
             del self.a[-1]
             del self.b[-1]
             self.lena -= 1
             self.lenb -= 1
 
     def read_context_hunk(self, lr):
         self.desc = lr.readline()
         m = contextdesc.match(self.desc)
         if not m:
             raise PatchError(_("bad hunk #%d") % self.number)
         foo, self.starta, foo2, aend, foo3 = m.groups()
         self.starta = int(self.starta)
         if aend is None:
             aend = self.starta
         self.lena = int(aend) - self.starta
         if self.starta:
             self.lena += 1
         for x in xrange(self.lena):
             l = lr.readline()
             if l.startswith('---'):
                 lr.push(l)
                 break
             s = l[2:]
             if l.startswith('- ') or l.startswith('! '):
                 u = '-' + s
             elif l.startswith('  '):
                 u = ' ' + s
             else:
                 raise PatchError(_("bad hunk #%d old text line %d") %
                                  (self.number, x))
             self.a.append(u)
             self.hunk.append(u)
 
         l = lr.readline()
         if l.startswith('\ '):
             s = self.a[-1][:-1]
             self.a[-1] = s
             self.hunk[-1] = s
             l = lr.readline()
         m = contextdesc.match(l)
         if not m:
             raise PatchError(_("bad hunk #%d") % self.number)
         foo, self.startb, foo2, bend, foo3 = m.groups()
         self.startb = int(self.startb)
         if bend is None:
             bend = self.startb
         self.lenb = int(bend) - self.startb
         if self.startb:
             self.lenb += 1
         hunki = 1
         for x in xrange(self.lenb):
             l = lr.readline()
             if l.startswith('\ '):
                 s = self.b[-1][:-1]
                 self.b[-1] = s
                 self.hunk[hunki - 1] = s
                 continue
             if not l:
                 lr.push(l)
                 break
             s = l[2:]
             if l.startswith('+ ') or l.startswith('! '):
                 u = '+' + s
             elif l.startswith('  '):
                 u = ' ' + s
             elif len(self.b) == 0:
                 # this can happen when the hunk does not add any lines
                 lr.push(l)
                 break
             else:
                 raise PatchError(_("bad hunk #%d old text line %d") %
                                  (self.number, x))
             self.b.append(s)
             while True:
                 if hunki >= len(self.hunk):
                     h = ""
                 else:
                     h = self.hunk[hunki]
                 hunki += 1
                 if h == u:
                     break
                 elif h.startswith('-'):
                     continue
                 else:
                     self.hunk.insert(hunki - 1, u)
                     break
 
         if not self.a:
             # this happens when lines were only added to the hunk
             for x in self.hunk:
                 if x.startswith('-') or x.startswith(' '):
                     self.a.append(x)
         if not self.b:
             # this happens when lines were only deleted from the hunk
             for x in self.hunk:
                 if x.startswith('+') or x.startswith(' '):
                     self.b.append(x[1:])
         # @@ -start,len +start,len @@
         self.desc = "@@ -%d,%d +%d,%d @@\n" % (self.starta, self.lena,
                                              self.startb, self.lenb)
         self.hunk[0] = self.desc
 
     def fix_newline(self):
         diffhelpers.fix_newline(self.hunk, self.a, self.b)
 
     def complete(self):
         return len(self.a) == self.lena and len(self.b) == self.lenb
 
     def createfile(self):
         return self.starta == 0 and self.lena == 0 and self.create
 
     def rmfile(self):
         return self.startb == 0 and self.lenb == 0 and self.remove
 
     def fuzzit(self, l, fuzz, toponly):
         # this removes context lines from the top and bottom of list 'l'.  It
         # checks the hunk to make sure only context lines are removed, and then
         # returns a new shortened list of lines.
         fuzz = min(fuzz, len(l)-1)
         if fuzz:
             top = 0
             bot = 0
             hlen = len(self.hunk)
             for x in xrange(hlen - 1):
                 # the hunk starts with the @@ line, so use x+1
                 if self.hunk[x + 1][0] == ' ':
                     top += 1
                 else:
                     break
             if not toponly:
                 for x in xrange(hlen - 1):
                     if self.hunk[hlen - bot - 1][0] == ' ':
                         bot += 1
                     else:
                         break
 
             # top and bot now count context in the hunk
             # adjust them if either one is short
             context = max(top, bot, 3)
             if bot < context:
                 bot = max(0, fuzz - (context - bot))
             else:
                 bot = min(fuzz, bot)
             if top < context:
                 top = max(0, fuzz - (context - top))
             else:
                 top = min(fuzz, top)
 
             return l[top:len(l)-bot]
         return l
 
     def old(self, fuzz=0, toponly=False):
         return self.fuzzit(self.a, fuzz, toponly)
 
     def new(self, fuzz=0, toponly=False):
         return self.fuzzit(self.b, fuzz, toponly)
 
 class binhunk:
     'A binary patch file. Only understands literals so far.'
     def __init__(self, gitpatch):
         self.gitpatch = gitpatch
         self.text = None
         self.hunk = ['GIT binary patch\n']
 
     def createfile(self):
         return self.gitpatch.op in ('ADD', 'RENAME', 'COPY')
 
     def rmfile(self):
         return self.gitpatch.op == 'DELETE'
 
     def complete(self):
         return self.text is not None
 
     def new(self):
         return [self.text]
 
     def extract(self, lr):
         line = lr.readline()
         self.hunk.append(line)
         while line and not line.startswith('literal '):
             line = lr.readline()
             self.hunk.append(line)
         if not line:
             raise PatchError(_('could not extract binary patch'))
         size = int(line[8:].rstrip())
         dec = []
         line = lr.readline()
         self.hunk.append(line)
         while len(line) > 1:
             l = line[0]
             if l <= 'Z' and l >= 'A':
                 l = ord(l) - ord('A') + 1
             else:
                 l = ord(l) - ord('a') + 27
             dec.append(base85.b85decode(line[1:-1])[:l])
             line = lr.readline()
             self.hunk.append(line)
         text = zlib.decompress(''.join(dec))
         if len(text) != size:
             raise PatchError(_('binary patch is %d bytes, not %d') %
                              len(text), size)
         self.text = text
 
 def parsefilename(str):
     # --- filename \t|space stuff
     s = str[4:].rstrip('\r\n')
     i = s.find('\t')
     if i < 0:
         i = s.find(' ')
         if i < 0:
             return s
     return s[:i]
 
 def selectfile(afile_orig, bfile_orig, hunk, strip):
     def pathstrip(path, count=1):
         pathlen = len(path)
         i = 0
         if count == 0:
             return '', path.rstrip()
         while count > 0:
             i = path.find('/', i)
             if i == -1:
                 raise PatchError(_("unable to strip away %d dirs from %s") %
                                  (count, path))
             i += 1
             # consume '//' in the path
             while i < pathlen - 1 and path[i] == '/':
                 i += 1
             count -= 1
         return path[:i].lstrip(), path[i:].rstrip()
 
     nulla = afile_orig == "/dev/null"
     nullb = bfile_orig == "/dev/null"
     abase, afile = pathstrip(afile_orig, strip)
     gooda = not nulla and util.lexists(afile)
     bbase, bfile = pathstrip(bfile_orig, strip)
     if afile == bfile:
         goodb = gooda
     else:
         goodb = not nullb and os.path.exists(bfile)
     createfunc = hunk.createfile
     missing = not goodb and not gooda and not createfunc()
 
     # some diff programs apparently produce create patches where the
     # afile is not /dev/null, but afile starts with bfile
     abasedir = afile[:afile.rfind('/') + 1]
     bbasedir = bfile[:bfile.rfind('/') + 1]
     if missing and abasedir == bbasedir and afile.startswith(bfile):
         # this isn't very pretty
         hunk.create = True
         if createfunc():
             missing = False
         else:
             hunk.create = False
 
     # If afile is "a/b/foo" and bfile is "a/b/foo.orig" we assume the
     # diff is between a file and its backup. In this case, the original
     # file should be patched (see original mpatch code).
     isbackup = (abase == bbase and bfile.startswith(afile))
     fname = None
     if not missing:
         if gooda and goodb:
             fname = isbackup and afile or bfile
         elif gooda:
             fname = afile
 
     if not fname:
         if not nullb:
             fname = isbackup and afile or bfile
         elif not nulla:
             fname = afile
         else:
             raise PatchError(_("undefined source and destination files"))
 
     return fname, missing
 
 def scangitpatch(lr, firstline):
     """
     Git patches can emit:
     - rename a to b
     - change b
     - copy a to c
     - change c
 
     We cannot apply this sequence as-is, the renamed 'a' could not be
     found for it would have been renamed already. And we cannot copy
     from 'b' instead because 'b' would have been changed already. So
     we scan the git patch for copy and rename commands so we can
     perform the copies ahead of time.
     """
     pos = 0
     try:
         pos = lr.fp.tell()
         fp = lr.fp
     except IOError:
         fp = cStringIO.StringIO(lr.fp.read())
     gitlr = linereader(fp, lr.textmode)
     gitlr.push(firstline)
     (dopatch, gitpatches) = readgitpatch(gitlr)
     fp.seek(pos)
     return dopatch, gitpatches
 
 def iterhunks(ui, fp, sourcefile=None):
     """Read a patch and yield the following events:
     - ("file", afile, bfile, firsthunk): select a new target file.
     - ("hunk", hunk): a new hunk is ready to be applied, follows a
     "file" event.
     - ("git", gitchanges): current diff is in git format, gitchanges
     maps filenames to gitpatch records. Unique event.
     """
     changed = {}
     current_hunk = None
     afile = ""
     bfile = ""
     state = None
     hunknum = 0
     emitfile = False
     git = False
 
     # our states
     BFILE = 1
     context = None
     lr = linereader(fp)
     # gitworkdone is True if a git operation (copy, rename, ...) was
     # performed already for the current file. Useful when the file
     # section may have no hunk.
     gitworkdone = False
     empty = None
 
     while True:
         newfile = newgitfile = False
         x = lr.readline()
         if not x:
             break
         if current_hunk:
             if x.startswith('\ '):
                 current_hunk.fix_newline()
             yield 'hunk', current_hunk
             current_hunk = None
             empty = False
         if ((sourcefile or state == BFILE) and ((not context and x[0] == '@') or
             ((context is not False) and x.startswith('***************')))):
             try:
                 if context is None and x.startswith('***************'):
                     context = True
                 gpatch = changed.get(bfile)
                 create = afile == '/dev/null' or gpatch and gpatch.op == 'ADD'
                 remove = bfile == '/dev/null' or gpatch and gpatch.op == 'DELETE'
                 current_hunk = hunk(x, hunknum + 1, lr, context, create, remove)
             except PatchError, err:
                 ui.debug(err)
                 current_hunk = None
                 continue
             hunknum += 1
             if emitfile:
                 emitfile = False
                 yield 'file', (afile, bfile, current_hunk)
                 empty = False
         elif state == BFILE and x.startswith('GIT binary patch'):
             current_hunk = binhunk(changed[bfile])
             hunknum += 1
             if emitfile:
                 emitfile = False
                 yield 'file', ('a/' + afile, 'b/' + bfile, current_hunk)
                 empty = False
             current_hunk.extract(lr)
         elif x.startswith('diff --git'):
             # check for git diff, scanning the whole patch file if needed
             m = gitre.match(x)
             gitworkdone = False
             if m:
                 afile, bfile = m.group(1, 2)
                 if not git:
                     git = True
                     gitpatches = scangitpatch(lr, x)[1]
                     yield 'git', gitpatches
                     for gp in gitpatches:
                         changed[gp.path] = gp
                 # else error?
                 # copy/rename + modify should modify target, not source
                 gp = changed.get(bfile)
                 if gp and (gp.op in ('COPY', 'DELETE', 'RENAME', 'ADD')
                            or gp.mode):
                     afile = bfile
                     gitworkdone = True
                 newgitfile = True
         elif x.startswith('---'):
             # check for a unified diff
             l2 = lr.readline()
             if not l2.startswith('+++'):
                 lr.push(l2)
                 continue
             newfile = True
             context = False
             afile = parsefilename(x)
             bfile = parsefilename(l2)
         elif x.startswith('***'):
             # check for a context diff
             l2 = lr.readline()
             if not l2.startswith('---'):
                 lr.push(l2)
                 continue
             l3 = lr.readline()
             lr.push(l3)
             if not l3.startswith("***************"):
                 lr.push(l2)
                 continue
             newfile = True
             context = True
             afile = parsefilename(x)
             bfile = parsefilename(l2)
 
         if newfile:
             if empty:
                 raise NoHunks
             empty = not gitworkdone
             gitworkdone = False
 
         if newgitfile or newfile:
             emitfile = True
             state = BFILE
             hunknum = 0
     if current_hunk:
         if current_hunk.complete():
             yield 'hunk', current_hunk
             empty = False
         else:
             raise PatchError(_("malformed patch %s %s") % (afile,
                              current_hunk.desc))
 
     if (empty is None and not gitworkdone) or empty:
         raise NoHunks
 
 def applydiff(ui, fp, changed, strip=1, sourcefile=None, eolmode='strict'):
     """
     Reads a patch from fp and tries to apply it.
 
     The dict 'changed' is filled in with all of the filenames changed
     by the patch. Returns 0 for a clean patch, -1 if any rejects were
     found and 1 if there was any fuzz.
 
     If 'eolmode' is 'strict', the patch content and patched file are
     read in binary mode. Otherwise, line endings are ignored when
     patching then normalized according to 'eolmode'.
     """
     rejects = 0
     err = 0
     current_file = None
     gitpatches = None
     opener = util.opener(os.getcwd())
 
     def closefile():
         if not current_file:
             return 0
         current_file.close()
         return len(current_file.rej)
 
     for state, values in iterhunks(ui, fp, sourcefile):
         if state == 'hunk':
             if not current_file:
                 continue
             current_hunk = values
             ret = current_file.apply(current_hunk)
             if ret >= 0:
                 changed.setdefault(current_file.fname, None)
                 if ret > 0:
                     err = 1
         elif state == 'file':
             rejects += closefile()
             afile, bfile, first_hunk = values
             try:
                 if sourcefile:
                     current_file = patchfile(ui, sourcefile, opener,
                                              eolmode=eolmode)
                 else:
                     current_file, missing = selectfile(afile, bfile,
                                                        first_hunk, strip)
                     current_file = patchfile(ui, current_file, opener,
                                              missing, eolmode)
             except PatchError, err:
                 ui.warn(str(err) + '\n')
                 current_file, current_hunk = None, None
                 rejects += 1
                 continue
         elif state == 'git':
             gitpatches = values
             cwd = os.getcwd()
             for gp in gitpatches:
                 if gp.op in ('COPY', 'RENAME'):
                     copyfile(gp.oldpath, gp.path, cwd)
                 changed[gp.path] = gp
         else:
             raise util.Abort(_('unsupported parser state: %s') % state)
 
     rejects += closefile()
 
     if rejects:
         return -1
     return err
 
 def updatedir(ui, repo, patches, similarity=0):
     '''Update dirstate after patch application according to metadata'''
     if not patches:
         return
     copies = []
     removes = set()
     cfiles = patches.keys()
     cwd = repo.getcwd()
     if cwd:
         cfiles = [util.pathto(repo.root, cwd, f) for f in patches.keys()]
     for f in patches:
         gp = patches[f]
         if not gp:
             continue
         if gp.op == 'RENAME':
             copies.append((gp.oldpath, gp.path))
             removes.add(gp.oldpath)
         elif gp.op == 'COPY':
             copies.append((gp.oldpath, gp.path))
         elif gp.op == 'DELETE':
             removes.add(gp.path)
     for src, dst in copies:
         repo.copy(src, dst)
     if (not similarity) and removes:
         repo.remove(sorted(removes), True)
     for f in patches:
         gp = patches[f]
         if gp and gp.mode:
             islink, isexec = gp.mode
             dst = repo.wjoin(gp.path)
             # patch won't create empty files
             if gp.op == 'ADD' and not os.path.exists(dst):
                 flags = (isexec and 'x' or '') + (islink and 'l' or '')
                 repo.wwrite(gp.path, '', flags)
             elif gp.op != 'DELETE':
                 util.set_flags(dst, islink, isexec)
     cmdutil.addremove(repo, cfiles, similarity=similarity)
     files = patches.keys()
     files.extend([r for r in removes if r not in files])
     return sorted(files)
 
 def externalpatch(patcher, args, patchname, ui, strip, cwd, files):
     """use <patcher> to apply <patchname> to the working directory.
     returns whether patch was applied with fuzz factor."""
 
     fuzz = False
     if cwd:
         args.append('-d %s' % util.shellquote(cwd))
     fp = util.popen('%s %s -p%d < %s' % (patcher, ' '.join(args), strip,
                                        util.shellquote(patchname)))
 
     for line in fp:
         line = line.rstrip()
         ui.note(line + '\n')
         if line.startswith('patching file '):
             pf = util.parse_patch_output(line)
             printed_file = False
             files.setdefault(pf, None)
         elif line.find('with fuzz') >= 0:
             fuzz = True
             if not printed_file:
                 ui.warn(pf + '\n')
                 printed_file = True
             ui.warn(line + '\n')
         elif line.find('saving rejects to file') >= 0:
             ui.warn(line + '\n')
         elif line.find('FAILED') >= 0:
             if not printed_file:
                 ui.warn(pf + '\n')
                 printed_file = True
             ui.warn(line + '\n')
     code = fp.close()
     if code:
         raise PatchError(_("patch command failed: %s") %
                          util.explain_exit(code)[0])
     return fuzz
 
 def internalpatch(patchobj, ui, strip, cwd, files=None, eolmode='strict'):
     """use builtin patch to apply <patchobj> to the working directory.
     returns whether patch was applied with fuzz factor."""
 
     if files is None:
         files = {}
     if eolmode is None:
         eolmode = ui.config('patch', 'eol', 'strict')
     if eolmode.lower() not in eolmodes:
         raise util.Abort(_('Unsupported line endings type: %s') % eolmode)
     eolmode = eolmode.lower()
 
     try:
         fp = open(patchobj, 'rb')
     except TypeError:
         fp = patchobj
     if cwd:
         curdir = os.getcwd()
         os.chdir(cwd)
     try:
         ret = applydiff(ui, fp, files, strip=strip, eolmode=eolmode)
     finally:
         if cwd:
             os.chdir(curdir)
         if fp != patchobj:
             fp.close()
     if ret < 0:
         raise PatchError
     return ret > 0
 
 def patch(patchname, ui, strip=1, cwd=None, files=None, eolmode='strict'):
     """Apply <patchname> to the working directory.
 
     'eolmode' specifies how end of lines should be handled. It can be:
     - 'strict': inputs are read in binary mode, EOLs are preserved
     - 'crlf': EOLs are ignored when patching and reset to CRLF
     - 'lf': EOLs are ignored when patching and reset to LF
     - None: get it from user settings, default to 'strict'
     'eolmode' is ignored when using an external patcher program.
 
     Returns whether patch was applied with fuzz factor.
     """
     patcher = ui.config('ui', 'patch')
     args = []
     if files is None:
         files = {}
     try:
         if patcher:
             return externalpatch(patcher, args, patchname, ui, strip, cwd,
                                  files)
         else:
             try:
                 return internalpatch(patchname, ui, strip, cwd, files, eolmode)
             except NoHunks:
                 ui.warn(_('internal patcher failed\n'
                           'please report details to '
                           'http://mercurial.selenic.com/bts/\n'
                           'or [e-mail]\n'))
                 patcher = (util.find_exe('gpatch') or util.find_exe('patch')
                            or 'patch')
                 ui.debug('no valid hunks found; trying with %r instead\n' %
                          patcher)
                 if util.needbinarypatch():
                     args.append('--binary')
                 return externalpatch(patcher, args, patchname, ui, strip, cwd,
                                      files)
     except PatchError, err:
         s = str(err)
         if s:
             raise util.Abort(s)
         else:
             raise util.Abort(_('patch failed to apply'))
 
 def b85diff(to, tn):
     '''print base85-encoded binary diff'''
     def gitindex(text):
         if not text:
             return '0' * 40
         l = len(text)
         s = util.sha1('blob %d\0' % l)
         s.update(text)
         return s.hexdigest()
 
     def fmtline(line):
         l = len(line)
         if l <= 26:
             l = chr(ord('A') + l - 1)
         else:
             l = chr(l - 26 + ord('a') - 1)
         return '%c%s\n' % (l, base85.b85encode(line, True))
 
     def chunk(text, csize=52):
         l = len(text)
         i = 0
         while i < l:
             yield text[i:i + csize]
             i += csize
 
     tohash = gitindex(to)
     tnhash = gitindex(tn)
     if tohash == tnhash:
         return ""
 
     # TODO: deltas
     ret = ['index %s..%s\nGIT binary patch\nliteral %s\n' %
            (tohash, tnhash, len(tn))]
     for l in chunk(zlib.compress(tn)):
         ret.append(fmtline(l))
     ret.append('\n')
     return ''.join(ret)
 
 class GitDiffRequired(Exception):
     pass
 
 def diffopts(ui, opts=None, untrusted=False):
     def get(key, name=None, getter=ui.configbool):
         return ((opts and opts.get(key)) or
                 getter('diff', name or key, None, untrusted=untrusted))
     return mdiff.diffopts(
         text=opts and opts.get('text'),
         git=get('git'),
         nodates=get('nodates'),
         showfunc=get('show_function', 'showfunc'),
         ignorews=get('ignore_all_space', 'ignorews'),
         ignorewsamount=get('ignore_space_change', 'ignorewsamount'),
         ignoreblanklines=get('ignore_blank_lines', 'ignoreblanklines'),
         context=get('unified', getter=ui.config))
 
 def diff(repo, node1=None, node2=None, match=None, changes=None, opts=None,
          losedatafn=None):
     '''yields diff of changes to files between two nodes, or node and
     working directory.
 
     if node1 is None, use first dirstate parent instead.
     if node2 is None, compare node1 with working directory.
 
     losedatafn(**kwarg) is a callable run when opts.upgrade=True and
     every time some change cannot be represented with the current
     patch format. Return False to upgrade to git patch format, True to
     accept the loss or raise an exception to abort the diff. It is
     called with the name of current file being diffed as 'fn'. If set
     to None, patches will always be upgraded to git format when
     necessary.
     '''
 
     if opts is None:
         opts = mdiff.defaultopts
 
     if not node1 and not node2:
         node1 = repo.dirstate.parents()[0]
 
     def lrugetfilectx():
         cache = {}
         order = []
         def getfilectx(f, ctx):
             fctx = ctx.filectx(f, filelog=cache.get(f))
             if f not in cache:
                 if len(cache) > 20:
                     del cache[order.pop(0)]
                 cache[f] = fctx.filelog()
             else:
                 order.remove(f)
             order.append(f)
             return fctx
         return getfilectx
     getfilectx = lrugetfilectx()
 
     ctx1 = repo[node1]
     ctx2 = repo[node2]
 
     if not changes:
         changes = repo.status(ctx1, ctx2, match=match)
     modified, added, removed = changes[:3]
 
     if not modified and not added and not removed:
         return []
 
     revs = None
     if not repo.ui.quiet:
         hexfunc = repo.ui.debugflag and hex or short
         revs = [hexfunc(node) for node in [node1, node2] if node]
 
     copy = {}
     if opts.git or opts.upgrade:
         copy = copies.copies(repo, ctx1, ctx2, repo[nullid])[0]
 
     difffn = lambda opts, losedata: trydiff(repo, revs, ctx1, ctx2,
                  modified, added, removed, copy, getfilectx, opts, losedata)
     if opts.upgrade and not opts.git:
         try:
             def losedata(fn):
                 if not losedatafn or not losedatafn(fn=fn):
                     raise GitDiffRequired()
             # Buffer the whole output until we are sure it can be generated
             return list(difffn(opts.copy(git=False), losedata))
         except GitDiffRequired:
             return difffn(opts.copy(git=True), None)
     else:
         return difffn(opts, None)
 
 def difflabel(func, *args, **kw):
     '''yields 2-tuples of (output, label) based on the output of func()'''
     prefixes = [('diff', 'diff.diffline'),
                 ('copy', 'diff.extended'),
                 ('rename', 'diff.extended'),
                 ('old', 'diff.extended'),
                 ('new', 'diff.extended'),
                 ('deleted', 'diff.extended'),
                 ('---', 'diff.file_a'),
                 ('+++', 'diff.file_b'),
                 ('@@', 'diff.hunk'),
                 ('-', 'diff.deleted'),
                 ('+', 'diff.inserted')]
 
     for chunk in func(*args, **kw):
         lines = chunk.split('\n')
         for i, line in enumerate(lines):
             if i != 0:
                 yield ('\n', '')
             stripline = line
             if line and line[0] in '+-':
                 # highlight trailing whitespace, but only in changed lines
                 stripline = line.rstrip()
             for prefix, label in prefixes:
                 if stripline.startswith(prefix):
                     yield (stripline, label)
                     break
             else:
                 yield (line, '')
             if line != stripline:
                 yield (line[len(stripline):], 'diff.trailingwhitespace')
 
 def diffui(*args, **kw):
     '''like diff(), but yields 2-tuples of (output, label) for ui.write()'''
     return difflabel(diff, *args, **kw)
 
 
 def _addmodehdr(header, omode, nmode):
     if omode != nmode:
         header.append('old mode %s\n' % omode)
         header.append('new mode %s\n' % nmode)
 
 def trydiff(repo, revs, ctx1, ctx2, modified, added, removed,
             copy, getfilectx, opts, losedatafn):
 
     date1 = util.datestr(ctx1.date())
     man1 = ctx1.manifest()
 
     gone = set()
     gitmode = {'l': '120000', 'x': '100755', '': '100644'}
 
     copyto = dict([(v, k) for k, v in copy.items()])
 
     if opts.git:
         revs = None
 
     for f in sorted(modified + added + removed):
         to = None
         tn = None
         dodiff = True
         header = []
         if f in man1:
             to = getfilectx(f, ctx1).data()
         if f not in removed:
             tn = getfilectx(f, ctx2).data()
         a, b = f, f
         if opts.git or losedatafn:
             if f in added:
                 mode = gitmode[ctx2.flags(f)]
                 if f in copy or f in copyto:
                     if opts.git:
                         if f in copy:
                             a = copy[f]
                         else:
                             a = copyto[f]
                         omode = gitmode[man1.flags(a)]
                         _addmodehdr(header, omode, mode)
                         if a in removed and a not in gone:
                             op = 'rename'
                             gone.add(a)
                         else:
                             op = 'copy'
                         header.append('%s from %s\n' % (op, a))
                         header.append('%s to %s\n' % (op, f))
                         to = getfilectx(a, ctx1).data()
                     else:
                         losedatafn(f)
                 else:
                     if opts.git:
                         header.append('new file mode %s\n' % mode)
                     elif ctx2.flags(f):
                         losedatafn(f)
                 if util.binary(tn):
                     if opts.git:
                         dodiff = 'binary'
                     else:
                         losedatafn(f)
                 if not opts.git and not tn:
                     # regular diffs cannot represent new empty file
                     losedatafn(f)
             elif f in removed:
                 if opts.git:
                     # have we already reported a copy above?
                     if ((f in copy and copy[f] in added
                          and copyto[copy[f]] == f) or
                         (f in copyto and copyto[f] in added
                          and copy[copyto[f]] == f)):
                         dodiff = False
                     else:
                         header.append('deleted file mode %s\n' %
                                       gitmode[man1.flags(f)])
                 elif not to:
                     # regular diffs cannot represent empty file deletion
                     losedatafn(f)
             else:
                 oflag = man1.flags(f)
                 nflag = ctx2.flags(f)
                 binary = util.binary(to) or util.binary(tn)
                 if opts.git:
                     _addmodehdr(header, gitmode[oflag], gitmode[nflag])
                     if binary:
                         dodiff = 'binary'
                 elif binary or nflag != oflag:
                     losedatafn(f)
             if opts.git:
                 header.insert(0, mdiff.diffline(revs, a, b, opts))
 
         if dodiff:
             if dodiff == 'binary':
                 text = b85diff(to, tn)
             else:
                 text = mdiff.unidiff(to, date1,
                                     # ctx2 date may be dynamic
                                     tn, util.datestr(ctx2.date()),
                                     a, b, revs, opts=opts)
             if header and (text or len(header) > 1):
                 yield ''.join(header)
             if text:
                 yield text
 
 def diffstatdata(lines):
     filename, adds, removes = None, 0, 0
     for line in lines:
         if line.startswith('diff'):
             if filename:
                 isbinary = adds == 0 and removes == 0
                 yield (filename, adds, removes, isbinary)
             # set numbers to 0 anyway when starting new file
             adds, removes = 0, 0
             if line.startswith('diff --git'):
                 filename = gitre.search(line).group(1)
             else:
                 # format: "diff -r ... -r ... filename"
                 filename = line.split(None, 5)[-1]
         elif line.startswith('+') and not line.startswith('+++'):
             adds += 1
         elif line.startswith('-') and not line.startswith('---'):
             removes += 1
     if filename:
         isbinary = adds == 0 and removes == 0
         yield (filename, adds, removes, isbinary)
 
 def diffstat(lines, width=80, git=False):
     output = []
     stats = list(diffstatdata(lines))
 
     maxtotal, maxname = 0, 0
     totaladds, totalremoves = 0, 0
     hasbinary = False
     for filename, adds, removes, isbinary in stats:
         totaladds += adds
         totalremoves += removes
         maxname = max(maxname, len(filename))
         maxtotal = max(maxtotal, adds + removes)
         if isbinary:
             hasbinary = True
 
     countwidth = len(str(maxtotal))
     if hasbinary and countwidth < 3:
         countwidth = 3
     graphwidth = width - countwidth - maxname - 6
     if graphwidth < 10:
         graphwidth = 10
 
     def scale(i):
         if maxtotal <= graphwidth:
             return i
         # If diffstat runs out of room it doesn't print anything,
         # which isn't very useful, so always print at least one + or -
         # if there were at least some changes.
         return max(i * graphwidth // maxtotal, int(bool(i)))
 
     for filename, adds, removes, isbinary in stats:
         if git and isbinary:
             count = 'Bin'
         else:
             count = adds + removes
         pluses = '+' * scale(adds)
         minuses = '-' * scale(removes)
         output.append(' %-*s |  %*s %s%s\n' % (maxname, filename, countwidth,
                                                count, pluses, minuses))
 
     if stats:
         output.append(_(' %d files changed, %d insertions(+), %d deletions(-)\n')
                       % (len(stats), totaladds, totalremoves))
 
     return ''.join(output)
 
 def diffstatui(*args, **kw):
     '''like diffstat(), but yields 2-tuples of (output, label) for
     ui.write()
     '''
 
     for line in diffstat(*args, **kw).splitlines():
         if line and line[-1] in '+-':
             name, graph = line.rsplit(' ', 1)
             yield (name + ' ', '')
             m = re.search(r'\++', graph)
             if m:
                 yield (m.group(0), 'diffstat.inserted')
             m = re.search(r'-+', graph)
             if m:
                 yield (m.group(0), 'diffstat.deleted')
         else:
             yield (line, '')
         yield ('\n', '')

tests/test-import

@@ -1,476 +1,497 b''
 #!/bin/sh
 
 hg init a
 mkdir a/d1
 mkdir a/d1/d2
 echo line 1 > a/a
 echo line 1 > a/d1/d2/a
 hg --cwd a ci -Ama
 
 echo line 2 >> a/a
 hg --cwd a ci -u someone -d '1 0' -m'second change'
 
 echo % import exported patch
 hg clone -r0 a b
 hg --cwd a export tip > tip.patch
 hg --cwd b import ../tip.patch
 echo % message should be same
 hg --cwd b tip | grep 'second change'
 echo % committer should be same
 hg --cwd b tip | grep someone
 rm -r b
 
 echo % import exported patch with external patcher
 cat > dummypatch.py <<EOF
 print 'patching file a'
 file('a', 'wb').write('line2\n')
 EOF
 chmod +x dummypatch.py
 hg clone -r0 a b
 hg --cwd a export tip > tip.patch
 hg --config ui.patch='python ../dummypatch.py' --cwd b import ../tip.patch
 cat b/a
 rm -r b
 
 echo % import of plain diff should fail without message
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 hg --cwd b import ../tip.patch
 rm -r b
 
 echo % import of plain diff should be ok with message
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 hg --cwd b import -mpatch ../tip.patch
 rm -r b
 
 echo % import of plain diff with specific date and user
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 hg --cwd b import -mpatch -d '1 0' -u '[e-mail]' ../tip.patch
 hg -R b tip -pv
 rm -r b
 
 echo % import of plain diff should be ok with --no-commit
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 hg --cwd b import --no-commit ../tip.patch
 hg --cwd b diff --nodates
 rm -r b
 
 echo % hg -R repo import
 # put the clone in a subdir - having a directory named "a"
 # used to hide a bug.
 mkdir dir
 hg clone -r0 a dir/b
 hg --cwd a export tip > dir/tip.patch
 cd dir
 hg -R b import tip.patch
 cd ..
 rm -r dir
 
 echo % import from stdin
 hg clone -r0 a b
 hg --cwd a export tip | hg --cwd b import -
 rm -r b
 
 echo % import two patches in one stream
 hg init b
 hg --cwd a export 0:tip | hg --cwd b import -
 hg --cwd a id
 hg --cwd b id
 rm -r b
 
 echo % override commit message
 hg clone -r0 a b
 hg --cwd a export tip | hg --cwd b import -m 'override' -
 hg --cwd b tip | grep override
 rm -r b
 
 cat > mkmsg.py <<EOF
 import email.Message, sys
 msg = email.Message.Message()
 msg.set_payload('email commit message\n' + open('tip.patch', 'rb').read())
 msg['Subject'] = 'email patch'
 msg['From'] = 'email patcher'
 sys.stdout.write(msg.as_string())
 EOF
 
 echo % plain diff in email, subject, message body
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 python mkmsg.py > msg.patch
 hg --cwd b import ../msg.patch
 hg --cwd b tip | grep email
 rm -r b
 
 echo % plain diff in email, no subject, message body
 hg clone -r0 a b
 grep -v '^Subject:' msg.patch | hg --cwd b import -
 rm -r b
 
 echo % plain diff in email, subject, no message body
 hg clone -r0 a b
 grep -v '^email ' msg.patch | hg --cwd b import -
 rm -r b
 
 echo % plain diff in email, no subject, no message body, should fail
 hg clone -r0 a b
 egrep -v '^(Subject|email)' msg.patch | hg --cwd b import -
 rm -r b
 
 echo % hg export in email, should use patch header
 hg clone -r0 a b
 hg --cwd a export tip > tip.patch
 python mkmsg.py | hg --cwd b import -
 hg --cwd b tip | grep second
 rm -r b
 
 # subject: duplicate detection, removal of [PATCH]
 # The '---' tests the gitsendmail handling without proper mail headers
 cat > mkmsg2.py <<EOF
 import email.Message, sys
 msg = email.Message.Message()
 msg.set_payload('email patch\n\nnext line\n---\n' + open('tip.patch').read())
 msg['Subject'] = '[PATCH] email patch'
 msg['From'] = 'email patcher'
 sys.stdout.write(msg.as_string())
 EOF
 
 echo '% plain diff in email, [PATCH] subject, message body with subject'
 hg clone -r0 a b
 hg --cwd a diff -r0:1 > tip.patch
 python mkmsg2.py | hg --cwd b import -
 hg --cwd b tip --template '{desc}\n'
 rm -r b
 
 # We weren't backing up the correct dirstate file when importing many patches
 # (issue963)
 echo '% import patch1 patch2; rollback'
 echo line 3 >> a/a
 hg --cwd a ci -m'third change'
 hg --cwd a export -o '../patch%R' 1 2
 hg clone -qr0 a b
 hg --cwd b parents --template 'parent: {rev}\n'
 hg --cwd b import ../patch1 ../patch2
 hg --cwd b rollback
 hg --cwd b parents --template 'parent: {rev}\n'
 rm -r b
 
 # bug non regression test
 # importing a patch in a subdirectory failed at the commit stage
 echo line 2 >> a/d1/d2/a
 hg --cwd a ci -u someoneelse -d '1 0' -m'subdir change'
 echo % hg import in a subdirectory
 hg clone -r0 a b
 hg --cwd a export tip | sed -e 's/d1\/d2\///' > tip.patch
 dir=`pwd`
 cd b/d1/d2 2>&1 > /dev/null
 hg import  ../../../tip.patch
 cd "$dir"
 echo "% message should be 'subdir change'"
 hg --cwd b tip | grep 'subdir change'
 echo "% committer should be 'someoneelse'"
 hg --cwd b tip | grep someoneelse
 echo "% should be empty"
 hg --cwd b status
 
 
 # Test fuzziness (ambiguous patch location, fuzz=2)
 echo % test fuzziness
 hg init fuzzy
 cd fuzzy
 echo line1 > a
 echo line0 >> a
 echo line3 >> a
 hg ci -Am adda
 echo line1 > a
 echo line2 >> a
 echo line0 >> a
 echo line3 >> a
 hg ci -m change a
 hg export tip > tip.patch
 hg up -C 0
 echo line1 > a
 echo line0 >> a
 echo line1 >> a
 echo line0 >> a
 hg ci -m brancha
 hg import --no-commit -v tip.patch
 hg revert -a
 echo '% test fuzziness with eol=auto'
 hg --config patch.eol=auto import --no-commit -v tip.patch
 cd ..
 
 # Test hunk touching empty files (issue906)
 hg init empty
 cd empty
 touch a
 touch b1
 touch c1
 echo d > d
 hg ci -Am init
 echo a > a
 echo b > b1
 hg mv b1 b2
 echo c > c1
 hg copy c1 c2
 rm d
 touch d
 hg diff --git
 hg ci -m empty
 hg export --git tip > empty.diff
 hg up -C 0
 hg import empty.diff
 for name in a b1 b2 c1 c2 d;
 do
     echo % $name file
     test -f $name && cat $name
 done
 cd ..
 
 # Test importing a patch ending with a binary file removal
 echo % test trailing binary removal
 hg init binaryremoval
 cd binaryremoval
 echo a > a
 python -c "file('b', 'wb').write('a\x00b')"
 hg ci -Am addall
 hg rm a
 hg rm b
 hg st
 hg ci -m remove
 hg export --git . > remove.diff
 cat remove.diff | grep git
 hg up -C 0
 hg import remove.diff
 hg manifest
 cd ..
 
 echo % 'test update+rename with common name (issue 927)'
 hg init t
 cd t
 touch a
 hg ci -Am t
 echo a > a
 # Here, bfile.startswith(afile)
 hg copy a a2
 hg ci -m copya
 hg export --git tip > copy.diff
 hg up -C 0
 hg import copy.diff
 echo % view a
 # a should contain an 'a'
 cat a
 echo % view a2
 # and a2 should have duplicated it
 cat a2
 cd ..
 
 echo % 'test -p0'
 hg init p0
 cd p0
 echo a > a
 hg ci -Am t
 hg import -p0 - << EOF
 foobar
 --- a	Sat Apr 12 22:43:58 2008 -0400
 +++ a	Sat Apr 12 22:44:05 2008 -0400
 @@ -1,1 +1,1 @@
 -a
 +bb
 EOF
 hg status
 cat a
 cd ..
 
 echo % 'test paths outside repo root'
 mkdir outside
 touch outside/foo
 hg init inside
 cd inside
 hg import - <<EOF
 diff --git a/a b/b
 rename from ../outside/foo
 rename to bar
 EOF
 cd ..
 
 echo '% test import with similarity (issue295)'
 hg init sim
 cd sim
 echo 'this is a test' > a
 hg ci -Ama
 cat > ../rename.diff <<EOF
 diff --git a/a b/a
 deleted file mode 100644
 --- a/a
 +++ /dev/null
 @@ -1,1 +0,0 @@
 -this is a test
 diff --git a/b b/b
 new file mode 100644
 --- /dev/null
 +++ b/b
 @@ -0,0 +1,2 @@
 +this is a test
 +foo
 EOF
 hg import --no-commit -v -s 1 ../rename.diff
 hg st -C
 hg revert -a
 rm b
 hg import --no-commit -v -s 100 ../rename.diff
 hg st -C
 cd ..
 
 
 echo '% add empty file from the end of patch (issue 1495)'
 hg init addemptyend
 cd addemptyend
 touch a
 hg addremove
 hg ci -m "commit"
 cat > a.patch <<EOF
 diff --git a/a b/a
 --- a/a
 +++ b/a
 @@ -0,0 +1,1 @@
 +a
 diff --git a/b b/b
 new file mode 100644
 EOF
 hg import --no-commit a.patch
 cd ..
 
 echo '% create file when source is not /dev/null'
 cat > create.patch <<EOF
 diff -Naur proj-orig/foo proj-new/foo
 --- proj-orig/foo       1969-12-31 16:00:00.000000000 -0800
 +++ proj-new/foo        2009-07-17 16:50:45.801368000 -0700
 @@ -0,0 +1,1 @@
 +a
 EOF
 # some people have patches like the following too
 cat > create2.patch <<EOF
 diff -Naur proj-orig/foo proj-new/foo
 --- proj-orig/foo.orig  1969-12-31 16:00:00.000000000 -0800
 +++ proj-new/foo        2009-07-17 16:50:45.801368000 -0700
 @@ -0,0 +1,1 @@
 +a
 EOF
 hg init oddcreate
 cd oddcreate
 hg import --no-commit ../create.patch
 cat foo
 rm foo
 hg revert foo
 hg import --no-commit ../create2.patch
 cat foo
 
 echo % 'first line mistaken for email headers (issue 1859)'
 hg init emailconfusion
 cd emailconfusion
 cat > a.patch <<EOF
 module: summary
 
 description
 
 
 diff -r 000000000000 -r 9b4c1e343b55 test.txt
 --- /dev/null
 +++ b/a
 @@ -0,0 +1,1 @@
 +a
 EOF
 hg import -d '0 0' a.patch
 hg parents -v
 cd ..
 
 echo % '--- in commit message'
 hg init commitconfusion
 cd commitconfusion
 cat > a.patch <<EOF
 module: summary
 
 --- description
 
 diff --git a/a b/a
 new file mode 100644
 --- /dev/null
 +++ b/a
 @@ -0,0 +1,1 @@
 +a
 EOF
 hg import -d '0 0' a.patch
 hg parents -v
 cd ..
 
 echo '% tricky header splitting'
 cat > trickyheaders.patch <<EOF
 From: User A <user@a>
 Subject: [PATCH] from: tricky!
 
 # HG changeset patch
 # User User B
 # Date 1266264441 18000
 # Branch stable
 # Node ID f2be6a1170ac83bf31cb4ae0bad00d7678115bc0
 # Parent  0000000000000000000000000000000000000000
 from: tricky!
 
 That is not a header.
 
 diff -r 000000000000 -r f2be6a1170ac foo
 --- /dev/null
 +++ b/foo
 @@ -0,0 +1,1 @@
 +foo
 EOF
 
 hg init trickyheaders
 cd trickyheaders
 hg import -d '0 0' ../trickyheaders.patch
 hg export --git tip
 cd ..
 
 echo '% issue2102'
 hg init issue2102
 cd issue2102
 mkdir -p src/cmd/gc
 touch src/cmd/gc/mksys.bash
 hg ci -Am init
 hg import - <<EOF
 # HG changeset patch
 # User Rob Pike
 # Date 1216685449 25200
 # Node ID 03aa2b206f499ad6eb50e6e207b9e710d6409c98
 # Parent  93d10138ad8df586827ca90b4ddb5033e21a3a84
 help management of empty pkg and lib directories in perforce
 
 R=gri
 DELTA=4  (4 added, 0 deleted, 0 changed)
 OCL=13328
 CL=13328
 
 diff --git a/lib/place-holder b/lib/place-holder
 new file mode 100644
 --- /dev/null
 +++ b/lib/place-holder
 @@ -0,0 +1,2 @@
 +perforce does not maintain empty directories.
 +this file helps.
 diff --git a/pkg/place-holder b/pkg/place-holder
 new file mode 100644
 --- /dev/null
 +++ b/pkg/place-holder
 @@ -0,0 +1,2 @@
 +perforce does not maintain empty directories.
 +this file helps.
 diff --git a/src/cmd/gc/mksys.bash b/src/cmd/gc/mksys.bash
 old mode 100644
 new mode 100755
 EOF
 hg sum
 hg diff --git -c tip
 cd ..
+
+echo '% diff lines looking like headers'
+hg init difflineslikeheaders
+cd difflineslikeheaders
+echo a >a
+echo b >b
+echo c >c
+hg ci -Am1
+
+echo "key: value" >>a
+echo "key: value" >>b
+echo "foo" >>c
+hg ci -m2
+
+hg up -C 0
+hg diff --git -c1 >want
+hg diff -c1 | hg import --no-commit -
+hg diff --git >have
+diff want have
+cd ..
+

tests/test-import.out

@@ -1,375 +1,381 b''
 adding a
 adding d1/d2/a
 % import exported patch
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 % message should be same
 summary:     second change
 % committer should be same
 user:        someone
 % import exported patch with external patcher
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 line2
 % import of plain diff should fail without message
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 abort: empty commit message
 % import of plain diff should be ok with message
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 % import of plain diff with specific date and user
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 changeset:   1:ca68f19f3a40
 tag:         tip
 user:        [e-mail]
 date:        Thu Jan 01 00:00:01 1970 +0000
 files:       a
 description:
 patch
 
 
 diff -r 80971e65b431 -r ca68f19f3a40 a
 --- a/a	Thu Jan 01 00:00:00 1970 +0000
 +++ b/a	Thu Jan 01 00:00:01 1970 +0000
 @@ -1,1 +1,2 @@
  line 1
 +line 2
 
 % import of plain diff should be ok with --no-commit
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../tip.patch
 diff -r 80971e65b431 a
 --- a/a
 +++ b/a
 @@ -1,1 +1,2 @@
  line 1
 +line 2
 % hg -R repo import
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying tip.patch
 % import from stdin
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 % import two patches in one stream
 applying patch from stdin
 applied 80971e65b431
 1d4bd90af0e4 tip
 1d4bd90af0e4 tip
 % override commit message
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 summary:     override
 % plain diff in email, subject, message body
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../msg.patch
 user:        email patcher
 summary:     email patch
 % plain diff in email, no subject, message body
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 % plain diff in email, subject, no message body
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 % plain diff in email, no subject, no message body, should fail
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 abort: empty commit message
 % hg export in email, should use patch header
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 summary:     second change
 % plain diff in email, [PATCH] subject, message body with subject
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying patch from stdin
 email patch
 
 next line
 ---
 % import patch1 patch2; rollback
 parent: 0
 applying ../patch1
 applying ../patch2
 applied 1d4bd90af0e4
 rolling back commit to revision 2
 parent: 1
 % hg import in a subdirectory
 requesting all changes
 adding changesets
 adding manifests
 adding file changes
 added 1 changesets with 2 changes to 2 files
 updating to branch default
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying ../../../tip.patch
 % message should be 'subdir change'
 summary:     subdir change
 % committer should be 'someoneelse'
 user:        someoneelse
 % should be empty
 % test fuzziness
 adding a
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 created new head
 applying tip.patch
 patching file a
 Hunk #1 succeeded at 1 with fuzz 2 (offset -2 lines).
 reverting a
 % test fuzziness with eol=auto
 applying tip.patch
 patching file a
 Hunk #1 succeeded at 1 with fuzz 2 (offset -2 lines).
 adding a
 adding b1
 adding c1
 adding d
 diff --git a/a b/a
 --- a/a
 +++ b/a
 @@ -0,0 +1,1 @@
 +a
 diff --git a/b1 b/b2
 rename from b1
 rename to b2
 --- a/b1
 +++ b/b2
 @@ -0,0 +1,1 @@
 +b
 diff --git a/c1 b/c1
 --- a/c1
 +++ b/c1
 @@ -0,0 +1,1 @@
 +c
 diff --git a/c1 b/c2
 copy from c1
 copy to c2
 --- a/c1
 +++ b/c2
 @@ -0,0 +1,1 @@
 +c
 diff --git a/d b/d
 --- a/d
 +++ b/d
 @@ -1,1 +0,0 @@
 -d
 4 files updated, 0 files merged, 2 files removed, 0 files unresolved
 applying empty.diff
 % a file
 a
 % b1 file
 % b2 file
 b
 % c1 file
 c
 % c2 file
 c
 % d file
 % test trailing binary removal
 adding a
 adding b
 R a
 R b
 diff --git a/a b/a
 diff --git a/b b/b
 2 files updated, 0 files merged, 0 files removed, 0 files unresolved
 applying remove.diff
 % test update+rename with common name (issue 927)
 adding a
 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
 applying copy.diff
 % view a
 a
 % view a2
 a
 % test -p0
 adding a
 applying patch from stdin
 bb
 % test paths outside repo root
 applying patch from stdin
 abort: ../outside/foo not under root
 % test import with similarity (issue295)
 adding a
 applying ../rename.diff
 patching file a
 patching file b
 removing a
 adding b
 recording removal of a as rename to b (88% similar)
 A b
   a
 R a
 undeleting a
 forgetting b
 applying ../rename.diff
 patching file a
 patching file b
 removing a
 adding b
 A b
 R a
 % add empty file from the end of patch (issue 1495)
 adding a
 applying a.patch
 % create file when source is not /dev/null
 applying ../create.patch
 a
 applying ../create2.patch
 a
 % first line mistaken for email headers (issue 1859)
 applying a.patch
 changeset:   0:5a681217c0ad
 tag:         tip
 user:        test
 date:        Thu Jan 01 00:00:00 1970 +0000
 files:       a
 description:
 module: summary
 
 description
 
 
 % --- in commit message
 applying a.patch
 changeset:   0:f34d9187897d
 tag:         tip
 user:        test
 date:        Thu Jan 01 00:00:00 1970 +0000
 files:       a
 description:
 module: summary
 
 
 % tricky header splitting
 applying ../trickyheaders.patch
 # HG changeset patch
 # User User B
 # Date 0 0
 # Node ID eb56ab91903632294ac504838508cb370c0901d2
 # Parent  0000000000000000000000000000000000000000
 from: tricky!
 
 That is not a header.
 
 diff --git a/foo b/foo
 new file mode 100644
 --- /dev/null
 +++ b/foo
 @@ -0,0 +1,1 @@
 +foo
 % issue2102
 adding src/cmd/gc/mksys.bash
 applying patch from stdin
 parent: 1:d59915696727 tip
  help management of empty pkg and lib directories in perforce
 branch: default
 commit: (clean)
 update: (current)
 diff --git a/lib/place-holder b/lib/place-holder
 new file mode 100644
 --- /dev/null
 +++ b/lib/place-holder
 @@ -0,0 +1,2 @@
 +perforce does not maintain empty directories.
 +this file helps.
 diff --git a/pkg/place-holder b/pkg/place-holder
 new file mode 100644
 --- /dev/null
 +++ b/pkg/place-holder
 @@ -0,0 +1,2 @@
 +perforce does not maintain empty directories.
 +this file helps.
 diff --git a/src/cmd/gc/mksys.bash b/src/cmd/gc/mksys.bash
 old mode 100644
 new mode 100755
+% diff lines looking like headers
+adding a
+adding b
+adding c
+3 files updated, 0 files merged, 0 files removed, 0 files unresolved
+applying patch from stdin