ESH

// 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"

;