Persistent Kakoune session based on git

editor.sh

#!/bin/sh

change_dir() {
  printf 'change-directory "%s"' "$1"
}

start_session() {
  session="$1"
  shift
  if kak -l | grep -wq "$session"; then
    return
  fi
  kak -d -s "$session" "$@"
}

start_git() {
  toplevel="$1"
  shift
  session="$(echo "$toplevel" | md5sum | cut -d ' ' -f 1)"
  start_session "$session" -E "$(change_dir "$toplevel")"
  kak -c "$session" "$@"
}

start_main() {
  if [ "$#" -eq 0 ]; then
    kak -c main -e "$(change_dir "$PWD")"
  else
    kak -c main "$@"
  fi
}

main() {
  toplevel="$(git rev-parse --show-toplevel 2>/dev/null)"
  if [ -z "$toplevel" ]; then
    start_main "$@"
  else
    start_git "$toplevel" "$@"
  fi
}

main "$@"