split: disable color while rendering template for use in commit message

Differential Revision: https://phab.mercurial-scm.org/D9322

hgext/split.py

@@ -142,9 +142,14 def dosplit(ui, repo, tr, ctx, opts):
             header = _(
                 b'HG: Splitting %s. So far it has been split into:\n'
             ) % short(ctx.node())
-            for c in committed:
-                summary = cmdutil.format_changeset_summary(ui, c, b'split')
-                header += _(b'HG: - %s\n') % summary
+            # We don't want color codes in the commit message template, so
+            # disable the label() template function while we render it.
+            with ui.configoverride(
+                {(b'templatealias', b'label(l,x)'): b"x"}, b'split'
+            ):
+                for c in committed:
+                    summary = cmdutil.format_changeset_summary(ui, c, b'split')
+                    header += _(b'HG: - %s\n') % summary
             header += _(
                 b'HG: Write commit message for the next split changeset.\n'
             )

tests/test-split.t

@@ -1031,7 +1031,7 Test that color codes don't end up in th
   (enter ? for help) [Ynesfdaq?]] [ ui.promptecho|a]
   
   EDITOR: HG: Splitting 6432c65c3078. So far it has been split into:
-  EDITOR: HG: - [rev|2] split2, modifying file2
+  EDITOR: HG: - 2 split2, modifying file2
   EDITOR: HG: Write commit message for the next split changeset.
   EDITOR: split1, modifying file1
   EDITOR: