manifest: add support for log-like template keywords and functions

"hg manifest --all" isn't supported since it has no single associated
revision.

mercurial/commands.py

@@ -3683,6 +3683,7 b' def manifest(ui, repo, node=None, rev=No'
     ui.pager('manifest')
     for f in ctx:
         fm.startitem()
+        fm.context(ctx=ctx)
         fl = ctx[f].flags()
         fm.condwrite(ui.debugflag, 'hash', '%s ', hex(mf[f]))
         fm.condwrite(ui.verbose, 'mode type', '%s %1s ', mode[fl], char[fl])

tests/test-manifest.t

@@ -50,6 +50,10 b' The next call is expected to return noth'
   644   a
   755 * b/a
   644 @ l
+  $ hg manifest -T '{path} {rev}\n'
+  a 1
+  b/a 1
+  l 1
 
   $ hg manifest --debug
   b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 644   a