mercurial/changelog.py
author Matt Mackall <mpm@selenic.com>
Sat, 18 Jul 2009 11:25:55 -0500
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# changelog.py - changelog class for mercurial
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#
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2, incorporated herein by reference.
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from node import bin, hex, nullid
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from i18n import _
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import util, error, revlog, encoding
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def _string_escape(text):
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    """
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    >>> d = {'nl': chr(10), 'bs': chr(92), 'cr': chr(13), 'nul': chr(0)}
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    >>> s = "ab%(nl)scd%(bs)s%(bs)sn%(nul)sab%(cr)scd%(bs)s%(nl)s" % d
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    >>> s
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    'ab\\ncd\\\\\\\\n\\x00ab\\rcd\\\\\\n'
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    >>> res = _string_escape(s)
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    >>> s == res.decode('string_escape')
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    True
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    """
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    # subset of the string_escape codec
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    text = text.replace('\\', '\\\\').replace('\n', '\\n').replace('\r', '\\r')
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    return text.replace('\0', '\\0')
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def decodeextra(text):
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    extra = {}
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    for l in text.split('\0'):
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        if l:
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            k, v = l.decode('string_escape').split(':', 1)
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            extra[k] = v
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    return extra
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def encodeextra(d):
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    # keys must be sorted to produce a deterministic changelog entry
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    items = [_string_escape('%s:%s' % (k, d[k])) for k in sorted(d)]
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    return "\0".join(items)
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class appender(object):
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    '''the changelog index must be updated last on disk, so we use this class
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    to delay writes to it'''
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    def __init__(self, fp, buf):
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        self.data = buf
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        self.fp = fp
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        self.offset = fp.tell()
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        self.size = util.fstat(fp).st_size
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    def end(self):
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        return self.size + len("".join(self.data))
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    def tell(self):
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        return self.offset
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    def flush(self):
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        pass
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    def close(self):
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        self.fp.close()
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    def seek(self, offset, whence=0):
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        '''virtual file offset spans real file and data'''
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        if whence == 0:
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            self.offset = offset
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        elif whence == 1:
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            self.offset += offset
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        elif whence == 2:
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            self.offset = self.end() + offset
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        if self.offset < self.size:
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            self.fp.seek(self.offset)
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    def read(self, count=-1):
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        '''only trick here is reads that span real file and data'''
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        ret = ""
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        if self.offset < self.size:
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            s = self.fp.read(count)
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            ret = s
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            self.offset += len(s)
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            if count > 0:
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                count -= len(s)
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        if count != 0:
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            doff = self.offset - self.size
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            self.data.insert(0, "".join(self.data))
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            del self.data[1:]
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            s = self.data[0][doff:doff+count]
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            self.offset += len(s)
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            ret += s
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        return ret
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    def write(self, s):
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        self.data.append(str(s))
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        self.offset += len(s)
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class changelog(revlog.revlog):
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    def __init__(self, opener):
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        self._realopener = opener
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        self._delayed = False
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        self._divert = False
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        revlog.revlog.__init__(self, self._delayopener, "00changelog.i")
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    def delayupdate(self):
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        "delay visibility of index updates to other readers"
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        self._delayed = True
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        self._divert = (len(self) == 0)
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        self._delaybuf = []
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    def finalize(self, tr):
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        "finalize index updates"
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        self._delayed = False
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        # move redirected index data back into place
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        if self._divert:
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            n = self._realopener(self.indexfile).name
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            util.rename(n + ".a", n)
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        elif self._delaybuf:
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            fp = self.opener(self.indexfile, 'a')
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            fp.write("".join(self._delaybuf))
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            fp.close()
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            self._delaybuf = []
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        # split when we're done
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        self.checkinlinesize(tr)
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    def _delayopener(self, name, mode='r'):
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        fp = self._realopener(name, mode)
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        # only divert the index
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        if not self._delayed or not name == self.indexfile:
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            return fp
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        # if we're doing an initial clone, divert to another file
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        if self._divert:
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            if not len(self):
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                # make sure to truncate the file
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                mode = mode.replace('a', 'w')
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            return self._realopener(name + ".a", mode)
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        # otherwise, divert to memory
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        return appender(fp, self._delaybuf)
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    def readpending(self, file):
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        r = revlog.revlog(self.opener, file)
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        self.index = r.index
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        self.nodemap = r.nodemap
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        self._chunkcache = r._chunkcache
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   137
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    def writepending(self):
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        "create a file containing the unfinalized state for pretxnchangegroup"
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        if self._delaybuf:
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            # make a temporary copy of the index
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            fp1 = self._realopener(self.indexfile)
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            fp2 = self._realopener(self.indexfile + ".a", "w")
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            fp2.write(fp1.read())
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            # add pending data
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            fp2.write("".join(self._delaybuf))
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            fp2.close()
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            # switch modes so finalize can simply rename
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            self._delaybuf = []
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            self._divert = True
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        if self._divert:
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            return True
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        return False
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    def checkinlinesize(self, tr, fp=None):
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        if self.opener == self._delayopener:
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            return
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        return revlog.revlog.checkinlinesize(self, tr, fp)
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   161
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    def read(self, node):
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        """
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        format used:
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        nodeid\n        : manifest node in ascii
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        user\n          : user, no \n or \r allowed
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        time tz extra\n : date (time is int or float, timezone is int)
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                        : extra is metadatas, encoded and separated by '\0'
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                        : older versions ignore it
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        files\n\n       : files modified by the cset, no \n or \r allowed
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        (.*)            : comment (free text, ideally utf-8)
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        changelog v0 doesn't use extra
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        """
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        text = self.revision(node)
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        if not text:
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            return (nullid, "", (0, 0), [], "", {'branch': 'default'})
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        last = text.index("\n\n")
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        desc = encoding.tolocal(text[last + 2:])
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        l = text[:last].split('\n')
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        manifest = bin(l[0])
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        user = encoding.tolocal(l[1])
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        extra_data = l[2].split(' ', 2)
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        if len(extra_data) != 3:
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            time = float(extra_data.pop(0))
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            try:
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                # various tools did silly things with the time zone field.
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                timezone = int(extra_data[0])
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            except:
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                timezone = 0
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            extra = {}
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        else:
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            time, timezone, extra = extra_data
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            time, timezone = float(time), int(timezone)
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            extra = decodeextra(extra)
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        if not extra.get('branch'):
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            extra['branch'] = 'default'
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        files = l[3:]
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        return (manifest, user, (time, timezone), files, desc, extra)
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    def add(self, manifest, files, desc, transaction, p1, p2,
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                  user, date=None, extra={}):
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        user = user.strip()
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        # An empty username or a username with a "\n" will make the
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   206
        # revision text contain two "\n\n" sequences -> corrupt
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   207
        # repository since read cannot unpack the revision.
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   208
        if not user:
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            raise error.RevlogError(_("empty username"))
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        if "\n" in user:
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            raise error.RevlogError(_("username %s contains a newline")
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                                    % repr(user))
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   213
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        # strip trailing whitespace and leading and trailing empty lines
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   215
        desc = '\n'.join([l.rstrip() for l in desc.splitlines()]).strip('\n')
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   216
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        user, desc = encoding.fromlocal(user), encoding.fromlocal(desc)
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   218
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   219
        if date:
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            parseddate = "%d %d" % util.parsedate(date)
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   221
        else:
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            parseddate = "%d %d" % util.makedate()
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        if extra and extra.get("branch") in ("default", ""):
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            del extra["branch"]
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        if extra:
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   226
            extra = encodeextra(extra)
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            parseddate = "%s %s" % (parseddate, extra)
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   228
        l = [hex(manifest), user, parseddate] + sorted(files) + ["", desc]
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        text = "\n".join(l)
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   230
        return self.addrevision(text, transaction, len(self), p1, p2)