#!/bin/bash - not strictly necessary, but helps nano with syntax highlighting.

__nanorc_prompt_command() {
  # Dynamically handle .nanorc file versions.

  hash nano >/dev/null 2>&1 && {
    # Darwin specifc .nanorc version.
    [[ "$PLATFORM" == "Darwin" ]] && [[ "$(hash -t nano)" == "/usr/bin/nano" ]] && local NANO_VER="darwin"
    # shellcheck disable=SC2155
    [[ -v NANO_VER ]] || local NANO_VER="$(command nano --version | awk '/version/ { print $4 }' | cut -d. -f1)"

    # Set the .nanorc symlink if it doesn't already point to the correct versioned file.
    if [[ -f "$HOME/.nanorc-$NANO_VER" ]]; then
      [[ "$(readlink "$HOME/.nanorc")" != ".nanorc-$NANO_VER" ]] && (cd "$HOME" && ln -sf ".nanorc-$NANO_VER" ".nanorc")
    else
      [[ -L "$HOME/.nanorc" ]] && rm -f "$HOME/.nanorc"
      printf "\\033[1;31m%s\\033[0m\\n" "No .nanorc for version '$NANO_VER'." >&2
    fi
  }

  return 0
}

# Add the nanorc prompt function call to PROMPT_COMMAND.
PROMPT_COMMAND+="__nanorc_prompt_command;"