// Copyright (C) 2023, Jakob Wakeling
// All rights reserved.

#include "../util/optget.h"
#include "../util/util.h"

#include <unistd.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static const char *const help;
extern const char *const version; /* main.c */

int bltn_cd(int, char *av[]) {
	struct opt opt = OPTGET_INIT; opt.str = "LP"; opt.lops = (struct lop[]){
		{ "help",    ARG_NUL, 256 },
		{ "version", ARG_NUL, 257 },
		{ NULL, 0, 0 },
	};
	
	struct { s32 mode; } args = {};
	
	for (int c; (c = optget(&opt, av, 1)) != -1;) {
		switch (c) {
			case 'L': { args.mode = 0; } break;
			case 'P': { args.mode = 1; } break;
			case 256: { fputs(help, stdout);    } return 0;
			case 257: { fputs(version, stdout); } return 0;
			default: {} return -1;
		}
	}
	
	char *path = av[opt.ind] ? av[opt.ind] : getenv("HOME");
	if (chdir(path)) {
		fprintf(stderr, "%s: %s: %s\n", av[0], path, strerror(errno));
		errno = 0; return -1;
	}
	
	path = getcwd(NULL, 0); setenv("PWD", path, 1);
	
	free(path); return 0;
}

static const char *const help =
	"cd - change directory\n"
	"Usage:\n"
	"  cd [-L|-P] [directory]\n"
	"Options:\n"
	"  -L         Handle the operand dot-dot logically\n"
	"  -P         Handle the operand dot-dot physically\n"
	"  --help     Display help information\n"
	"  --version  Display version information\n"
;