#!/bin/sh
# SPDX-License-Identifier: MIT
set -eu
export TZ=UTC LC_ALL=C
export GIT_CONFIG_NOSYSTEM=1 GIT_CONFIG_GLOBAL=/dev/null
export GIT_AUTHOR_NAME='Example Author'
export GIT_AUTHOR_EMAIL='author@example.invalid'
export GIT_COMMITTER_NAME='Example Author'
export GIT_COMMITTER_EMAIL='author@example.invalid'
export GIT_AUTHOR_DATE='2026-10-25T12:00:00Z'
export GIT_COMMITTER_DATE='2026-10-25T12:00:00Z'
test "$(git --version)" = 'git version 2.56.0'
mkdir worktree-example
cd worktree-example
mkdir primary
cd primary
git -c init.templateDir= init -q -b main
printf 'base\n' > note.txt
git add note.txt
git commit -qm 'Base'
git branch topic
git worktree add -q ../second topic
test "$(git branch --show-current)" = main
test "$(git -C ../second branch --show-current)" = topic
if git worktree add -q ../refused main 2>/dev/null; then
  printf 'Expected branch-in-use refusal\n' >&2
  exit 1
fi
printf 'guard: second checkout of main refused\n'
printf 'main draft\n' > note.txt
printf 'topic draft\n' > ../second/note.txt
git -C ../second add note.txt
test -z "$(git diff --cached)"
test -n "$(git -C ../second diff --cached)"
test "$(cat note.txt)" = 'main draft'
test "$(cat ../second/note.txt)" = 'topic draft'
printf 'state: working files and staged changes are separate\n'
if git worktree remove ../second 2>/dev/null; then
  printf 'Expected dirty-worktree refusal\n' >&2
  exit 1
fi
printf 'guard: removal with staged work refused\n'
git -C ../second commit -qm 'Topic draft'
topic_tip=$(git rev-parse topic)
test "$(git show topic:note.txt)" = 'topic draft'
git worktree remove ../second
test ! -d ../second
test "$(git rev-parse topic)" = "$topic_tip"
printf 'remove: directory removed; topic branch retained\n'