commit: change "editform" to distinguish merge commits from others

"editform" argument for "getcommiteditor" is decided according to the
format below:

  COMMAND[.ROUTE]

  - COMMAND: name of command
  - ROUTE: name of route, if there are two or more routes in COMMAND

This patch uses "normal.normal" and "normal.merge" as ROUTE of
"editform" instead of "normal", to distinguish merge commits from
others in "hg commit" without "--amend" case.

This patch assumes "editform" variations for "hg commit" below:

    commit.normal.normal
    commit.normal.merge
    commit.amend.normal
    commit.amend.merge

"mergeeditform" is factored out for subsequent patches. It takes
"ctxorbool" argument, because context object can't be passed in some
cases.

mercurial/cmdutil.py

@@ -109,6 +109,23 b' def logmessage(ui, opts):'
                              (logfile, inst.strerror))
     return message
 
+def mergeeditform(ctxorbool, baseform):
+    """build appropriate editform from ctxorbool and baseform
+
+    'cxtorbool' is one of a ctx to be committed, or a bool whether
+    merging is committed.
+
+    This returns editform 'baseform' with '.merge' if merging is
+    committed, or one with '.normal' suffix otherwise.
+    """
+    if isinstance(ctxorbool, bool):
+        if ctxorbool:
+            return baseform + ".merge"
+    elif 1 < len(ctxorbool.parents()):
+        return baseform + ".merge"
+
+    return baseform + ".normal"
+
 def getcommiteditor(edit=False, finishdesc=None, extramsg=None,
                     editform='', **opts):
     """get appropriate commit message editor according to '--edit' option

mercurial/commands.py

@@ -1448,7 +1448,7 b' def commit(ui, repo, *pats, **opts):'
                     # Propagate to subrepos
                     baseui.setconfig('phases', 'new-commit', 'secret', 'commit')
 
-                editform = 'commit.normal'
+                editform = cmdutil.mergeeditform(repo[None], 'commit.normal')
                 editor = cmdutil.getcommiteditor(editform=editform, **opts)
                 return repo.commit(message, opts.get('user'), opts.get('date'),
                                    match,

mercurial/help/config.txt

@@ -395,7 +395,8 b' messages for each actions.'
 
 - ``changeset.backout`` for :hg:`backout`
 - ``changeset.commit.amend`` for :hg:`commit --amend`
-- ``changeset.commit.normal`` for :hg:`commit` without ``--amend``
+- ``changeset.commit.normal.merge`` for :hg:`commit` on merges
+- ``changeset.commit.normal.normal`` for :hg:`commit` on other
 - ``changeset.fetch`` for :hg:`fetch` (impling merge commit)
 - ``changeset.gpg.sign`` for :hg:`sign`
 - ``changeset.graft`` for :hg:`graft`
@@ -422,7 +423,7 b' commit message for :hg:`tag` regardless '
 
 At the external editor invocation for committing, corresponding
 dot-separated list of names without ``changeset.`` prefix
-(e.g. ``commit.normal``) is in ``HGEDITFORM`` environment variable.
+(e.g. ``commit.normal.normal``) is in ``HGEDITFORM`` environment variable.
 
 In this section, items other than ``changeset`` can be referred from
 others. For example, the configuration to list committed files up

tests/test-commit.t

@@ -9,7 +9,7 b' commit date test'
   > true
   > EOF
   $ HGEDITOR="sh $TESTTMP/checkeditform.sh" hg commit -m ""
-  HGEDITFORM=commit.normal
+  HGEDITFORM=commit.normal.normal
   abort: empty commit message
   [255]
   $ hg commit -d '0 0' -m commit-1
@@ -282,7 +282,8 b' should fail because we are specifying a '
 
 should succeed
 
-  $ hg ci -mmerge
+  $ HGEDITOR="sh $TESTTMP/checkeditform.sh" hg ci -mmerge --edit
+  HGEDITFORM=commit.normal.merge
   $ cd ..