grep: add support for log-like template keywords and functions

mercurial/commands.py

@@ -2634,6 +2634,7 b' def grep(ui, repo, pattern, *pats, **opt'
             iter = [('', l) for l in states]
         for change, l in iter:
             fm.startitem()
+            fm.context(ctx=ctx)
             fm.data(node=fm.hexfunc(scmutil.binnode(ctx)))
 
             cols = [

tests/test-grep.t

@@ -53,6 +53,11 b' simple templated'
   port:4:vaportight
   port:4:import/export
 
+  $ hg grep port -T '{file}:{tags}:{texts}\n'
+  port:tip:export
+  port:tip:vaportight
+  port:tip:import/export
+
 simple JSON (no "change" field)
 
   $ hg grep -Tjson port