#!/bin/sh

# Settings
CSV_URL="https://www8.cao.go.jp/chosei/shukujitsu/syukujitsu.csv"

# Internal configuration settings
TMP_CSV_FILE="holidays-jp-tmp.csv"
RAW_CSV_FILE="holidays-jp-raw.csv"
CSV_FILE="holidays-jp.csv"

EXIT_SUCCESS=0
EXIT_FAILURE=1

# Verify the required runtime environment
if ! command -v curl >/dev/null; then
  echo "This script requires \"curl\" to be installed. Please install it and try again."
  exit $EXIT_FAILURE
fi
if ! command -v nkf >/dev/null; then
  echo "This script requires \"nkf\" to be installed. Please install it and try again."
  exit $EXIT_FAILURE
fi

# Run
curl -sS -L -o $TMP_CSV_FILE $CSV_URL
if ! diff -q $RAW_CSV_FILE $TMP_CSV_FILE >/dev/null 2>&1; then
  mv $TMP_CSV_FILE $RAW_CSV_FILE
  nkf -w $RAW_CSV_FILE >$CSV_FILE
else
  rm $TMP_CSV_FILE
fi

# Exit
exit $EXIT_SUCCESS