log: add logging for commands

mercurial/dispatch.py

@@ -511,6 +511,8 b' def _dispatch(ui, args):'
     elif rpath:
         ui.warn(_("warning: --repository ignored\n"))
 
+    msg = ' '.join(' ' in a and repr(a) or a for a in fullargs)
+    ui.log("command", msg + "\n")
     d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
     return runcommand(lui, repo, cmd, fullargs, ui, options, d,
                       cmdpats, cmdoptions)