patch.py: re-add the ability to use an external patch program
This is now invoked by default only if ui.patch is set. Otherwise, we
use our built-in patch. If that fails because it can't find any valid
hunks, we'll fall back to trying the external patch command.
#!/bin/sh
cat > patchtool.py <<EOF
import sys
print 'Using custom patch'
if '--binary' in sys.argv:
print '--binary found !'
EOF
echo "[ui]" >> $HGRCPATH
echo "patch=python ../patchtool.py" >> $HGRCPATH
hg init a
cd a
echo a > a
hg commit -Ama -d '1 0'
echo b >> a
hg commit -Amb -d '2 0'
cd ..
# This test check that:
# - custom patch commands with arguments actually works
# - patch code does not try to add weird arguments like
# --binary when custom patch commands are used. For instance
# --binary is added by default under win32.
echo % check custom patch options are honored
hg --cwd a export -o ../a.diff tip
hg clone -r 0 a b
hg --cwd b import -v ../a.diff