diff mercurial/commands.py @ 28391:73905484ef70

dispatch: make loading extra information from extension extensible

This patch makes loading extra information from extension module at
dispatching extensible. Factoring 'loadcmdtable()' into commands.py is
a part of generalization of loading extra information.

This extensibility assumes registration of new function like below,
for example:

  - revset predicate
  - fileset predicate
  - template keyword
  - template filter
  - template function
  - internal merge tool
  - web command

This patch requires not loader function itself but container module
and the name of it, because listing loader function directly up
implies actual loading module of it, even if it isn't used at runtime
(for example, extensions don't always define revset predicate)

--- a/mercurial/commands.py	Tue Mar 08 00:20:08 2016 -0800
+++ b/mercurial/commands.py	Tue Mar 08 23:04:53 2016 +0900
@@ -7147,3 +7147,12 @@
             for i, name in enumerate(names):
                 ui.write("  %-*s  %s  %s\n" %
                          (maxnamelen, name, place[i], vers[i]))
+
+def loadcmdtable(ui, name, cmdtable):
+    """Load command functions from specified cmdtable
+    """
+    overrides = [cmd for cmd in cmdtable if cmd in table]
+    if overrides:
+        ui.warn(_("extension '%s' overrides commands: %s\n")
+                % (name, " ".join(overrides)))
+    table.update(cmdtable)