transplant: use "ui.extractchoices()" to show the list of available responses

Before this patch, transplant extension shows the list of available
responses by specific string, even though the prompt string passed to
"ui.promptchoice()" has enough (maybe i18n-ed) information.

This patch uses "ui.extractchoices()" to show the list of available
responses.

hgext/transplant.py

@@ -451,15 +451,6 b' def hasnode(repo, node):'
 
 def browserevs(ui, repo, nodes, opts):
     '''interactively transplant changesets'''
-    def browsehelp(ui):
-        ui.write(_('y: transplant this changeset\n'
-                   'n: skip this changeset\n'
-                   'm: merge at this changeset\n'
-                   'p: show patch\n'
-                   'c: commit selected changesets\n'
-                   'q: cancel transplant\n'
-                   '?: show this help\n'))
-
     displayer = cmdutil.show_changeset(ui, repo, opts)
     transplants = []
     merges = []
@@ -477,7 +468,8 b' def browserevs(ui, repo, nodes, opts):'
         while not action:
             action = 'ynmpcq?'[ui.promptchoice(prompt)]
             if action == '?':
-                browsehelp(ui)
+                for c, t in ui.extractchoices(prompt)[1]:
+                    ui.write('%s: %s\n' % (c, t))
                 action = None
             elif action == 'p':
                 parent = repo.changelog.parents(node)[0]

tests/test-transplant.t

@@ -493,13 +493,13 b' test interactive transplant'
   > EOF
   1:d11e3596cc1a
   apply changeset? [ynmpcq?]: unrecognized response
-  apply changeset? [ynmpcq?]: y: transplant this changeset
-  n: skip this changeset
+  apply changeset? [ynmpcq?]: y: yes, transplant this changeset
+  n: no, skip this changeset
   m: merge at this changeset
   p: show patch
   c: commit selected changesets
-  q: cancel transplant
-  ?: show this help
+  q: quit and cancel transplant
+  ?: ? (show this help)
   apply changeset? [ynmpcq?]: 4:a53251cdf717
   apply changeset? [ynmpcq?]:  (no-eol)
   $ hg heads --template "{node|short}\n"