fix bugs in vc-blame and create hg-blame

--HG--
branch : pmacs2

method/hg.py

@@ -1,10 +1,17 @@
-from method import Method, Argument
+from subprocess import Popen, PIPE, STDOUT
 
-class HgBlame(Method):
+from method import Method, Argument
+from method.vc import VcBlame
+import re
+
+class HgBlame(VcBlame):
     """Show buffer annotated with hg metadata"""
-    # use hg blame -udq FILE
-    def _execute(self, w, **vargs):
-        w.set_error("unimplemented")
+    line_re = re.compile(r'^ *(?P<user>[^ ]+) (?P<rev>\d+) (?P<date>\d{4}-\d{2}-\d{2}): (?P<content>.*)\n$')
+    prefix_fmt = '[b:d:*]%(rev)-5s [c:d:*]%(user)-10s [b:d:*]%(date)10s[d:d:*]'
+    _is_method = True
+    def _open_pipe(self, w, **vargs):
+        cmd = ("hg", 'blame', '-nudq', w.buffer.path)
+        return Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)
 
 class HgLog(Method):
     """Show hg log for this buffer"""

method/vc.py

@@ -3,6 +3,8 @@ import buffer.color
 import util
 import lex
 
+class VcException(Exception): pass
+
 class VcBlame(Method):
     _is_method = False
     line_re    = None
@@ -10,7 +12,7 @@ class VcBlame(Method):
     def _filter(self, line):
         m = self.line_re.match(line)
         if not m:
-            raise SvnException("couldn't parse %r" % line)
+            raise VcException("couldn't parse %r" % line)
         return m.groupdict()
     def _open_pipe(self, w, **vargs):
         raise Exception('unimplemented')