add hg and python

sys/lib/python/mercurial/filelog.py

@@ -0,0 +1,68 @@
+# filelog.py - file history class for mercurial
+#
+# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
+import revlog
+
+class filelog(revlog.revlog):
+    def __init__(self, opener, path):
+        revlog.revlog.__init__(self, opener,
+                        "/".join(("data", path + ".i")))
+
+    def read(self, node):
+        t = self.revision(node)
+        if not t.startswith('\1\n'):
+            return t
+        s = t.index('\1\n', 2)
+        return t[s+2:]
+
+    def _readmeta(self, node):
+        t = self.revision(node)
+        if not t.startswith('\1\n'):
+            return {}
+        s = t.index('\1\n', 2)
+        mt = t[2:s]
+        m = {}
+        for l in mt.splitlines():
+            k, v = l.split(": ", 1)
+            m[k] = v
+        return m
+
+    def add(self, text, meta, transaction, link, p1=None, p2=None):
+        if meta or text.startswith('\1\n'):
+            mt = ""
+            if meta:
+                mt = ["%s: %s\n" % (k, v) for k, v in meta.iteritems()]
+            text = "\1\n%s\1\n%s" % ("".join(mt), text)
+        return self.addrevision(text, transaction, link, p1, p2)
+
+    def renamed(self, node):
+        if self.parents(node)[0] != revlog.nullid:
+            return False
+        m = self._readmeta(node)
+        if m and "copy" in m:
+            return (m["copy"], revlog.bin(m["copyrev"]))
+        return False
+
+    def size(self, rev):
+        """return the size of a given revision"""
+
+        # for revisions with renames, we have to go the slow way
+        node = self.node(rev)
+        if self.renamed(node):
+            return len(self.read(node))
+
+        return revlog.revlog.size(self, rev)
+
+    def cmp(self, node, text):
+        """compare text with a given file revision"""
+
+        # for renames, we have to go the slow way
+        if self.renamed(node):
+            t2 = self.read(node)
+            return t2 != text
+
+        return revlog.revlog.cmp(self, node, text)