/*
 * ========================
 * =====    ===============
 * ======  ================
 * ======  ================
 * ======  ====   ====   ==
 * ======  ===     ==  =  =
 * ======  ===  =  ==     =
 * =  ===  ===  =  ==  ====
 * =  ===  ===  =  ==  =  =
 * ==     =====   ====   ==
 * ========================
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2023-2024, Joe
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the organization nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JOE ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JOE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * hardflip: src/c_utils.go
 * Wed Dec 20 10:50:12 2023
 * Joe
 *
 * core funcs
 */

package main

import (
	"fmt"
	"os"
)

// this function will go get the data folder and try to create it if it does
// not exist
// the first path being checked is $XDG_DATA_HOME then $HOME/.local/share
// it returns the full data directory path
func c_get_data_dir() string {
	var ptr *string
	var home string
	if home = os.Getenv("HOME"); len(home) == 0 {
		c_die("env variable HOME not defined", nil)
	}
	xdg_home := os.Getenv("XDG_DATA_HOME")

	if len(xdg_home) > 0 {
		ptr = &xdg_home
	} else {
		ptr = &home
		*ptr += "/.local/share"
	}
	*ptr += "/" + DATA_DIR_NAME
	if _, err := os.Stat(*ptr); os.IsNotExist(err) {
	    if err := os.MkdirAll(*ptr, os.ModePerm); err != nil {
	        c_die("could not create path " + *ptr, err)
	    }
	}
	return *ptr
}

// c_die displays an error string to the stderr fd and exits the program
// with the return code 1
// it takes an optional err argument of the error type as a complement of
// information
func c_die(str string, err error) {
	fmt.Fprintf(os.Stderr, "error: %s", str)
	if err != nil {
		fmt.Fprintf(os.Stderr, ": %v\n", err)
	}
	fmt.Fprintf(os.Stderr, "\n")
	os.Exit(1)
}