--- a/hgext/extdiff.py	Mon Aug 14 11:41:08 2006 -0700
+++ b/hgext/extdiff.py	Mon Aug 14 15:51:35 2006 -0700
@@ -35,7 +35,7 @@
 from mercurial.node import *
 demandload(globals(), 'mercurial:commands,cmdutil,util os shutil tempfile')
 
-def dodiff(ui, repo, diffcmd, pats, opts):
+def dodiff(ui, repo, diffcmd, diffopts, pats, opts):
     def snapshot_node(files, node):
         '''snapshot files as of some revision'''
         changes = repo.changelog.read(node)
@@ -92,10 +92,12 @@
             dir2 = snapshot_node(modified + added, node2)
         else:
             dir2 = snapshot_wdir(modified + added)
-        util.system('%s %s %s %s' %
-                    (util.shellquote(diffcmd), ' '.join(opts['option']),
-                     util.shellquote(dir1), util.shellquote(dir2)),
-                    cwd=tmproot)
+        cmdline = ('%s %s %s %s' %
+                   (util.shellquote(diffcmd),
+                    ' '.join(map(util.shellquote, diffopts)),
+                    util.shellquote(dir1), util.shellquote(dir2)))
+        ui.debug('running %r in %s\n' % (cmdline, tmproot))
+        util.system(cmdline, cwd=tmproot)
         return 1
     finally:
         ui.note(_('cleaning up temp directory\n'))
@@ -105,7 +107,9 @@
     '''use external program to diff repository (or selected files)
 
     Show differences between revisions for the specified files, using
-    an external program.  The default program used is "diff -Npru".
+    an external program.  The default program used is diff, with
+    default options "-Npru".
+
     To select a different program, use the -p option.  The program
     will be passed the names of two directories to compare.  To pass
     additional options to the program, use the -o option.  These will
@@ -116,7 +120,8 @@
     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 -Npru', pats, opts)
+    return dodiff(ui, repo, opts['program'] or 'diff',
+                  opts['option'] or ['-Npru'], pats, opts)
 
 cmdtable = {
     "extdiff":
@@ -134,20 +139,24 @@
         if not cmd.startswith('cmd.'): continue
         cmd = cmd[4:]
         if not path: path = cmd
+        diffopts = ui.config('extdiff', 'opts.' + cmd, '')
+        diffopts = diffopts and [diffopts] or []
         def save(cmd, path):
             '''use closure to save diff command to use'''
             def mydiff(ui, repo, *pats, **opts):
-                return dodiff(ui, repo, path, pats, opts)
-            mydiff.__doc__ = '''use %s to diff repository (or selected files)
+                return dodiff(ui, repo, path, diffopts, pats, opts)
+            mydiff.__doc__ = '''use %(path)r to diff repository (or selected files)
 
             Show differences between revisions for the specified
-            files, using the %s program.
+            files, using the %(path)r program.
 
             When two revision arguments are given, then changes are
             shown between those revisions. If only one revision is
             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.''' % (cmd, cmd)
+            working directory files are compared to its parent.''' % {
+                'path': path,
+                }
             return mydiff
         cmdtable[cmd] = (save(cmd, path),
                          cmdtable['extdiff'][1][1:],

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-extdiff	Mon Aug 14 15:51:35 2006 -0700
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+HGRCPATH=$HGTMP/.hgrc; export HGRCPATH
+echo "[extensions]" >> $HGTMP/.hgrc
+echo "extdiff=" >> $HGTMP/.hgrc
+
+hg init a
+cd a
+echo a > a
+hg add
+hg extdiff -o -Nr
+
+echo "[extdiff]" >> $HGTMP/.hgrc
+echo "cmd.falabala=echo" >> $HGTMP/.hgrc
+echo "opts.falabala=diffing" >> $HGTMP/.hgrc
+
+hg falabala
+
+hg help falabala
+
+hg ci -d '0 0' -mtest1
+
+echo b >> a
+hg ci -d '1 0' -mtest2
+
+hg falabala -r 0:1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-extdiff.out	Mon Aug 14 15:51:35 2006 -0700
@@ -0,0 +1,31 @@
+adding a
+making snapshot of 0 files from rev 000000000000
+making snapshot of 1 files from working dir
+diff -Nr a.000000000000/a a/a
+0a1
+> a
+making snapshot of 0 files from rev 000000000000
+making snapshot of 1 files from working dir
+diffing a.000000000000 a
+hg falabala [OPT]... [FILE]...
+
+use 'echo' to diff repository (or selected files)
+
+            Show differences between revisions for the specified
+            files, using the 'echo' program.
+
+            When two revision arguments are given, then changes are
+            shown between those revisions. If only one revision is
+            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.
+
+options:
+
+ -o --option   pass option to comparison program
+ -r --rev      revision
+ -I --include  include names matching the given patterns
+ -X --exclude  exclude names matching the given patterns
+making snapshot of 1 files from rev e27a2475d60a
+making snapshot of 1 files from rev 5e49ec8d3f05
+diffing a.e27a2475d60a a.5e49ec8d3f05