bookmarks: Add -B option to incoming/outgoing to compare bookmarks

We add a -B/--bookmarks option to hg incmoing and hg outgoing. If the option
is passed we compare bookmarks instead of changesets. This can be used
to see which bookmarks do not exists on the remote site.

hgext/bookmarks.py

@@ -30,7 +30,7 b' branching.'
 
 from mercurial.i18n import _
 from mercurial.node import nullid, nullrev, hex, short
-from mercurial import util, commands, repair, extensions, pushkey, hg
+from mercurial import util, commands, repair, extensions, pushkey, hg, url
 import os
 
 def write(repo):
@@ -445,6 +445,37 b' def push(oldpush, ui, repo, dest=None, *'
 
     return result
 
+def diffbookmarks(ui, repo, remote):
+    ui.status(_("searching for changes\n"))
+
+    lmarks = repo.listkeys('bookmarks')
+    rmarks = remote.listkeys('bookmarks')
+
+    diff = set(rmarks) - set(lmarks)
+    for k in diff:
+        ui.write("   %-25s %s\n" % (k, rmarks[k][:12]))
+
+    if len(diff) <= 0:
+        ui.status(_("no changes found\n"))
+
+def incoming(oldincoming, ui, repo, source="default", **opts):
+    if opts.get('bookmarks'):
+        source, branches = hg.parseurl(ui.expandpath(source), opts.get('branch'))
+        other = hg.repository(hg.remoteui(repo, opts), source)
+        ui.status(_('comparing with %s\n') % url.hidepassword(source))
+        diffbookmarks(ui, repo, other)
+    else:
+        oldincoming(ui, repo, source, **opts)
+
+def outgoing(oldoutgoing, ui, repo, source="default", **opts):
+    if opts.get('bookmarks'):
+        source, branches = hg.parseurl(ui.expandpath(source), opts.get('branch'))
+        other = hg.repository(hg.remoteui(repo, opts), source)
+        ui.status(_('comparing with %s\n') % url.hidepassword(source))
+        diffbookmarks(ui, other, repo)
+    else:
+        oldoutgoing(ui, repo, source, **opts)
+
 def uisetup(ui):
     extensions.wrapfunction(repair, "strip", strip)
     if ui.configbool('bookmarks', 'track.current'):
@@ -456,6 +487,12 b' def uisetup(ui):'
     entry = extensions.wrapcommand(commands.table, 'push', push)
     entry[1].append(('B', 'bookmark', [],
                      _("bookmark to export")))
+    entry = extensions.wrapcommand(commands.table, 'incoming', incoming)
+    entry[1].append(('B', 'bookmarks', False,
+                     _("compare bookmark")))
+    entry = extensions.wrapcommand(commands.table, 'outgoing', outgoing)
+    entry[1].append(('B', 'bookmarks', False,
+                     _("compare bookmark")))
 
     pushkey.register('bookmarks', pushbookmark, listbookmarks)