#!/bin/sh
# jj-gitpatch - use git add -p as diff-editor for jj

# https://zerowidth.com/2025/jj-tips-and-tricks/
set -eu
left=$1
right=$2
rm -f "$right/JJ-INSTRUCTIONS"
git -C "$left" init -q
git -C "$left" add -A
git -C "$left" commit -q -m baseline --allow-empty
mv "$left/.git" "$right"
git -C "$right" add --intent-to-add -A
git -C "$right" add -p
git -C "$right" diff-index --quiet --cached HEAD && { echo "No changes done, aborting split."; exit 1; }
git -C "$right" commit -q -m split
git -C "$right" restore . # undo changes in modified files
git -C "$right" reset .   # undo --intent-to-add
git -C "$right" clean -q -df # remove untracked files