--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-custom-filters	Sat Feb 09 12:27:58 2008 -0500
@@ -0,0 +1,60 @@
+#!/bin/sh
+
+hg init
+
+cat > .hg/hgrc <<EOF
+[extensions]
+prefixfilter = prefix.py
+[encode]
+*.txt = stripprefix: Copyright 2046, The Masters
+[decode]
+*.txt = insertprefix: Copyright 2046, The Masters
+EOF
+
+cat > prefix.py <<EOF
+from mercurial import util
+def stripprefix(s, cmd, filename, **kwargs):
+    header = '%s\n' % cmd
+    if s[:len(header)] != header:
+        raise util.Abort('missing header "%s" in %s' % (cmd, filename))
+    return s[len(header):]
+def insertprefix(s, cmd):
+    return '%s\n%s' % (cmd, s)
+def reposetup(ui, repo):
+    repo.adddatafilter('stripprefix:', stripprefix)
+    repo.adddatafilter('insertprefix:', insertprefix)
+EOF
+
+cat > .hgignore <<EOF
+.hgignore
+prefix.py
+prefix.pyc
+EOF
+
+cat > stuff.txt <<EOF
+Copyright 2046, The Masters
+Some stuff to ponder very carefully.
+EOF
+hg add stuff.txt
+hg ci -m stuff
+
+echo '% Repository data:'
+hg cat stuff.txt
+
+echo '% Fresh checkout:'
+rm stuff.txt
+hg up
+cat stuff.txt
+echo >> stuff.txt <<EOF
+Very very carefully.
+EOF
+hg stat
+
+cat > morestuff.txt <<EOF
+Unauthorized material subject to destruction.
+EOF
+
+echo '% Problem encoding:'
+hg add morestuff.txt
+hg ci -m morestuff
+hg stat