phabricator: add a "phabstatus" template keyword

We add a "phabstatus" template keyword, returning an object with "url"
and "status" keys. This is quite similar to "phabreview" template
keyword, but it queries phabricator for each specified revision so it's
going to be slow (as compared to the "phabstatus" show view from
previous changeset).

Differential Revision: https://phab.mercurial-scm.org/D7507

hgext/phabricator.py

@@ -1684,6 +1684,28 b' def template_review(context, mapping):'
     return None
 
 
[e-mail](b'phabstatus', requires={b'ctx', b'repo', b'ui'})
+def template_status(context, mapping):
+    """:phabstatus: String. Status of Phabricator differential.
+    """
+    ctx = context.resource(mapping, b'ctx')
+    repo = context.resource(mapping, b'repo')
+    ui = context.resource(mapping, b'ui')
+
+    rev = ctx.rev()
+    try:
+        drevid = getdrevmap(repo, [rev])[rev]
+    except KeyError:
+        return None
+    drevs = callconduit(ui, b'differential.query', {b'ids': [drevid]})
+    for drev in drevs:
+        if int(drev[b'id']) == drevid:
+            return templateutil.hybriddict(
+                {b'url': drev[b'uri'], b'status': drev[b'statusName'],}
+            )
+    return None
+
+
 @show.showview(b'phabstatus', csettopic=b'work')
 def phabstatusshowview(ui, repo, displayer):
     """Phabricator differiential status"""