utils.zsh

#!/usr/bin/env bash

case $- in
  *i*) export IS_INTERACTIVE="1";;
  *) export IS_SCRIPT="1";;
esac

is_interactive (){
  if [ -n "$IS_INTERACTIVE" ]; then return 0; fi
  return 1
}

case "$(uname -s)" in
  Linux*) export IS_LINUX="1";;
  Darwin*) export IS_MACOS="1";;
  *) exit 1
esac

is_macos() {
  if [ -n "$IS_MACOS" ]; then return 0; fi
  return 1
}

is_linux() {
  if [ -n "$IS_LINUX" ]; then return 0; fi
  return 1
}

is_missing() {
  if ! type "$1" > /dev/null; then return 0; fi
  return 1
}

wait_until() {
  is_interactive && {
    read -r -s -k "?Press enter when $1..." < /dev/tty
  }
  ! is_interactive && {
    echo "Cannot wait for $1, terminal is not interactive. Exiting..."
    exit 1
  }
}

# link file and backup if needed
link(){
  local src="$1"
  local dst="$2"

  # Backup the existing link
  if [ -f "$dst" ] || [ -d "$dst" ] || [ -L "$dst" ]; then
    # If the existing destination does not link to the current source, backup it
    if ! [ "$src" = "$(readlink "$dst")" ]; then
      mv "$dst" "${dst}.backup.$(date +%s)"
    fi
  fi

  # Link the file
  ln -fs "$src" "$dst"
}