localrepo: add "editor" argument to "tag()"

Before this patch, "localrepository.tag()" doesn't take "editor"
argument, and this prevents callers from passing "editor" argument to
"localrepository.commit()" invoked internally.

This patch adds "editor" argument to "localrepository.tag()" (and
"_tag()", too), and makes "commands.tag()" invoke it with "editor"
argument.

This patch also omits explicit "localrepository.savecommitmesssage()"
invocation, because "localrepository.commit()" will invoke specified
"editor" and save edited commit message into ".hg/last-message.txt"
automatically.

mercurial/commands.py

@@ -5684,15 +5684,18 b' def tag(ui, repo, name1, *names, **opts)'
             date = util.parsedate(date)
 
         if opts.get('edit'):
-            message = ui.edit(message, ui.username())
-            repo.savecommitmessage(message)
+            def editor(repo, ctx, subs):
+                return ui.edit(ctx.description() + "\n", ctx.user())
+        else:
+            editor = False
 
         # don't allow tagging the null rev
         if (not opts.get('remove') and
             scmutil.revsingle(repo, rev_).rev() == nullrev):
             raise util.Abort(_("cannot tag null revision"))
 
-        repo.tag(names, r, message, opts.get('local'), opts.get('user'), date)
+        repo.tag(names, r, message, opts.get('local'), opts.get('user'), date,
+                 editor=editor)
     finally:
         release(lock, wlock)
 

mercurial/localrepo.py

@@ -479,7 +479,8 b' class localrepository(object):'
         return hook.hook(self.ui, self, name, throw, **args)
 
     @unfilteredmethod
-    def _tag(self, names, node, message, local, user, date, extra={}):
+    def _tag(self, names, node, message, local, user, date, extra={},
+             editor=False):
         if isinstance(names, str):
             names = (names,)
 
@@ -539,14 +540,15 b' class localrepository(object):'
             self[None].add(['.hgtags'])
 
         m = matchmod.exact(self.root, '', ['.hgtags'])
-        tagnode = self.commit(message, user, date, extra=extra, match=m)
+        tagnode = self.commit(message, user, date, extra=extra, match=m,
+                              editor=editor)
 
         for name in names:
             self.hook('tag', node=hex(node), tag=name, local=local)
 
         return tagnode
 
-    def tag(self, names, node, message, local, user, date):
+    def tag(self, names, node, message, local, user, date, editor=False):
         '''tag a revision with one or more symbolic names.
 
         names is a list of strings or, when adding a single tag, names may be a
@@ -574,7 +576,7 b' class localrepository(object):'
                                        '(please commit .hgtags manually)'))
 
         self.tags() # instantiate the cache
-        self._tag(names, node, message, local, user, date)
+        self._tag(names, node, message, local, user, date, editor=editor)
 
     @filteredpropertycache
     def _tagscache(self):

tests/test-tag.t

@@ -225,8 +225,11 b' test custom commit messages'
 
 at first, test saving last-message.txt
 
+(test that editor is not invoked before transaction starting)
+
   $ cat > .hg/hgrc << '__EOF__'
   > [hooks]
+  > # this failure occurs before editor invocation
   > pretag.test-saving-lastmessage = false
   > __EOF__
   $ rm -f .hg/last-message.txt
@@ -234,12 +237,37 b' at first, test saving last-message.txt'
   abort: pretag.test-saving-lastmessage hook exited with status 1
   [255]
   $ cat .hg/last-message.txt
+  cat: .hg/last-message.txt: No such file or directory
+  [1]
+
+(test that editor is invoked and commit message is saved into
+"last-message.txt")
+
+  $ cat >> .hg/hgrc << '__EOF__'
+  > [hooks]
+  > pretag.test-saving-lastmessage =
+  > # this failure occurs after editor invocation
+  > pretxncommit.unexpectedabort = false
+  > __EOF__
+
+  $ rm -f .hg/last-message.txt
+  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg tag custom-tag -e
+  transaction abort!
+  rollback completed
+  note: commit message saved in .hg/last-message.txt
+  abort: pretxncommit.unexpectedabort hook exited with status 1
+  [255]
+  $ cat .hg/last-message.txt
   custom tag message
   second line
-  $ cat > .hg/hgrc << '__EOF__'
+
+  $ cat >> .hg/hgrc << '__EOF__'
   > [hooks]
-  > pretag.test-saving-lastmessage =
+  > pretxncommit.unexpectedabort =
   > __EOF__
+  $ hg status .hgtags
+  M .hgtags
+  $ hg revert --no-backup -q .hgtags
 
 then, test custom commit message itself