tests/test-hgk

extensions: move extensions listing functions from mercurial.help

Includes some small fix-ups to comments in enabled() and disabled().

#!/bin/sh

echo "[extensions]" >> $HGRCPATH
echo "hgk=" >> $HGRCPATH

hg init repo
cd repo
echo a > a
hg ci -Am adda
hg debug-cat-file commit 0