#!/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' GIT_AUTHOR_EMAIL='author@example.invalid'
export GIT_COMMITTER_NAME='Example Author' GIT_COMMITTER_EMAIL='author@example.invalid'
export GIT_AUTHOR_DATE='2026-10-27T12:00:00+00:00'
export GIT_COMMITTER_DATE='2026-10-27T12:00:00+00:00'
test "$(git version)" = 'git version 2.56.0'

mkdir rebase-example
cd rebase-example
printf '#!/bin/sh\nexit 0\n' > editor.sh
chmod +x editor.sh
case_setup() {
  mkdir "$1"
  cd "$1"
  git init --template= --bare -q --initial-branch=main origin.git
  git init --template= -q --initial-branch=main repo
  cd repo
  printf 'base\n' > note.txt
  git add note.txt
  git commit -qm 'Base'
  git remote add origin ../origin.git
  git push -q -u origin main >/dev/null
  git switch -qc topic
  printf 'topic\n' > note.txt
  git commit -qam 'Topic change'
  original=$(git rev-parse HEAD)
  git switch -q main
  printf 'upstream\n' > note.txt
  git commit -qam 'Upstream change'
  git push -q origin main
  git switch -q topic
  if git rebase main >../rebase-log 2>&1; then
    printf 'Expected a conflict\n' >&2
    exit 1
  fi
}
case_setup continued
printf 'resolved\n' > note.txt
git add note.txt
GIT_EDITOR=../../editor.sh git rebase --continue >/dev/null 2>&1
test "$(cat note.txt)" = resolved
test "$(git rev-parse HEAD)" != "$original"
git merge-base --is-ancestor main HEAD
printf 'Continue: resolved commit replayed on main\n'
cd ../..
case_setup skipped
git rebase --skip >/dev/null 2>&1
test "$(cat note.txt)" = upstream
test "$(git rev-parse HEAD)" = "$(git rev-parse main)"
printf 'Skip: conflicting topic commit omitted\n'
cd ../..
case_setup aborted
git rebase --abort
test "$(git rev-parse HEAD)" = "$original"
test "$(cat note.txt)" = topic
printf 'Abort: original topic commit and content restored\n'