mercurial-scm/hg: mercurial/util.py comparison

dispatch: generalize signature checking for extension command wrapping

comparison

equal deleted inserted replaced

-:7e9a15fa6c8f
+:5751631246de
 This contains helper routines that are independent of the SCM core and hide
 platform-specific details from the core.
 """
 from i18n import _
-import cStringIO, errno, getpass, re, shutil, sys, tempfile
+import cStringIO, errno, getpass, re, shutil, sys, tempfile, traceback
 import os, stat, threading, time, calendar, ConfigParser, locale, glob, osutil
 import imp
 # Python compatibility
 else:
 os.environ[k] = v
 if cwd is not None and oldcwd != cwd:
 os.chdir(oldcwd)
+class SignatureError:
+pass
+def checksignature(func):
+'''wrap a function with code to check for calling errors'''
+def check(*args, **kwargs):
+try:
+return func(*args, **kwargs)
+except TypeError:
+if len(traceback.extract_tb(sys.exc_info()[2])) == 1:
+raise SignatureError
+raise
+return check
 # os.path.lexists is not available on python2.3
 def lexists(filename):
 "test whether a file with this name exists. does not follow symlinks"
 try:
 os.lstat(filename)

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