--- a/mercurial/commands.py	Sun Oct 14 20:40:23 2012 +0200
+++ b/mercurial/commands.py	Sun Oct 14 20:27:55 2012 +0200
@@ -2994,16 +2994,17 @@
         else:
             iter = [('', l) for l in states]
         for change, l in iter:
-            cols = [fn, str(rev)]
+            cols = [(fn, 'grep.filename'), (str(rev), 'grep.rev')]
             before, match, after = None, None, None
+
             if opts.get('line_number'):
-                cols.append(str(l.linenum))
+                cols.append((str(l.linenum), 'grep.linenumber'))
             if opts.get('all'):
-                cols.append(change)
+                cols.append((change, 'grep.change'))
             if opts.get('user'):
-                cols.append(ui.shortuser(ctx.user()))
+                cols.append((ui.shortuser(ctx.user()), 'grep.user'))
             if opts.get('date'):
-                cols.append(datefunc(ctx.date()))
+                cols.append((datefunc(ctx.date()), 'grep.date'))
             if opts.get('files_with_matches'):
                 c = (fn, rev)
                 if c in filerevmatches:
@@ -3013,12 +3014,16 @@
                 before = l.line[:l.colstart]
                 match = l.line[l.colstart:l.colend]
                 after = l.line[l.colend:]
-            ui.write(sep.join(cols))
+            for col, label in cols[:-1]:
+                ui.write(col, label=label)
+                ui.write(sep, label='grep.sep')
+            ui.write(cols[-1][0], label=cols[-1][1])
             if before is not None:
+                ui.write(sep, label='grep.sep')
                 if not opts.get('text') and binary():
-                    ui.write(sep + " Binary file matches")
+                    ui.write(" Binary file matches")
                 else:
-                    ui.write(sep + before)
+                    ui.write(before)
                     ui.write(match, label='grep.match')
                     ui.write(after)
             ui.write(eol)