Bug 846409 - Add |mach mach-debug-commands|; r=jhammel

DONTBUILD (NPOTB)

build/mach_bootstrap.py

@@ -31,6 +31,7 @@ SEARCH_PATHS = [
 MACH_MODULES = [
     'addon-sdk/mach_commands.py',
     'layout/tools/reftest/mach_commands.py',
+    'python/mach/mach/commands/commandinfo.py',
     'python/mozboot/mozboot/mach_commands.py',
     'python/mozbuild/mozbuild/config.py',
     'python/mozbuild/mozbuild/mach_commands.py',

python/mach/mach/commands/commandinfo.py

@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, # You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import print_function, unicode_literals
+
+from mach.decorators import (
+    CommandProvider,
+    Command,
+)
+
+
+@CommandProvider
+class BuiltinCommands(object):
+    def __init__(self, context):
+        self.context = context
+
+    @Command('mach-debug-commands', help='Show info about available mach commands.')
+    def commands(self):
+        import inspect
+
+        handlers = self.context.commands.command_handlers
+        for command in sorted(handlers.keys()):
+            handler = handlers[command]
+            cls = handler.cls
+            method = getattr(cls, getattr(handler, 'method'))
+
+            print(command)
+            print('=' * len(command))
+            print('')
+            print('File: %s' % inspect.getsourcefile(method))
+            print('Class: %s' % cls.__name__)
+            print('Method: %s' % handler.method)
+            print('')
+