--- a/hgext/extdiff.py
+++ b/hgext/extdiff.py
@@ -137,8 +137,12 @@ def extdiff(ui, repo, *pats, **opts):
specified then that revision is compared to the working
directory, and, when no revisions are specified, the
working directory files are compared to its parent.'''
- return dodiff(ui, repo, opts['program'] or 'diff',
- opts['option'] or ['-Npru'], pats, opts)
+ program = opts['program'] or 'diff'
+ if opts['program']:
+ option = opts['option']
+ else:
+ option = opts['option'] or ['-Npru']
+ return dodiff(ui, repo, program, option, pats, opts)
cmdtable = {
"extdiff":