[PATCH] grep: add the option to show full commit hash for every result

[Kostia Balytskyi]

# HG changeset patch
# User Kostia Balytskyi <ikostia at fb.com>
# Date 1454599288 28800
#      Thu Feb 04 07:21:28 2016 -0800
# Node ID 436dfb325e8ce1b9cdad569a2bbe408a0d33bb5f
# Parent  d73a5ab18015f61ac61e6e77256512fd82b03818
grep: add the option to show full commit hash for every result

People often would want to send the result of hg grep to someone
else with a remote repo. Currently it's of no big use since revision
ids are not global. Introducing --hash will allow people to identify
search results in a global way.

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -4084,6 +4084,7 @@
      _('only search files changed within revision range'), _('REV')),
     ('u', 'user', None, _('list the author (long with -v)')),
     ('d', 'date', None, _('list the date (short with -q)')),
+    ('', 'hash', None, _('show full commit hash instead of revision id')),
     ] + walkopts,
     _('[OPTION]... PATTERN [FILE]...'),
     inferrepo=True)
@@ -4186,6 +4187,7 @@
 
     def display(fn, ctx, pstates, states):
         rev = ctx.rev()
+        hash = ctx.hex()
         if ui.quiet:
             datefunc = util.shortdate
         else:
@@ -4201,8 +4203,12 @@
         else:
             iter = [('', l) for l in states]
         for change, l in iter:
-            cols = [(fn, 'grep.filename'), (str(rev), 'grep.rev')]
-
+            cols = [(fn, 'grep.filename')]
+
+            if opts.get('hash'):
+                cols.append((str(hash), 'grep.rev'))
+            else:
+                cols.append((str(rev), 'grep.rev'))
             if opts.get('line_number'):
                 cols.append((str(l.linenum), 'grep.linenumber'))
             if opts.get('all'):
diff --git a/tests/test-grep.t b/tests/test-grep.t
--- a/tests/test-grep.t
+++ b/tests/test-grep.t
@@ -173,6 +173,11 @@
   color:3:-:red
   color:1:+:red
 
+Check that --hash option works
+  $ hg grep --hash --all red
+  color:[a-f0-9]{40}:-:red (re)
+  color:[a-f0-9]{40}:\+:red (re)
+
   $ cd ..
 
   $ hg init a