[PATCH] formatter: ditch namedtuple in favor of attr

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1525327696 -32400
#      Thu May 03 15:08:16 2018 +0900
# Node ID bebe0c7559fa5015d636a73be9fba988911ff760
# Parent  9ae8a72dec358d33c96725e1f94c631e869deb80
formatter: ditch namedtuple in favor of attr

diff --git a/mercurial/formatter.py b/mercurial/formatter.py
--- a/mercurial/formatter.py
+++ b/mercurial/formatter.py
@@ -107,7 +107,6 @@ baz: foo, bar
 
 from __future__ import absolute_import, print_function
 
-import collections
 import contextlib
 import itertools
 import os
@@ -117,6 +116,9 @@ from .node import (
     hex,
     short,
 )
+from .thirdparty import (
+    attr,
+)
 
 from . import (
     error,
@@ -413,8 +415,11 @@ class templateformatter(baseformatter):
         baseformatter.end(self)
         self._renderitem('docfooter', {})
 
-templatespec = collections.namedtuple(r'templatespec',
-                                      r'ref tmpl mapfile')
+ at attr.s(frozen=True)
+class templatespec(object):
+    ref = attr.ib()
+    tmpl = attr.ib()
+    mapfile = attr.ib()
 
 def lookuptemplate(ui, topic, tmpl):
     """Find the template matching the given -T/--template spec 'tmpl'