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/*
Copyright (c) 2024, Lance Borden
All rights reserved.
This software is licensed under the BSD 3-Clause License.
You may obtain a copy of the license at:
https://opensource.org/licenses/BSD-3-Clause
Redistribution and use in source and binary forms, with or without
modification, are permitted under the conditions stated in the BSD 3-Clause
License.
THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "help.h"
#include "lua.h"
#include "lua_api.h"
#include "lush.h"
#include <asm-generic/ioctls.h>
#include <bits/time.h>
#include <dirent.h>
#include <linux/limits.h>
#include <locale.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
char *builtin_strs[] = {"cd", "help", "exit", "time"};
char *builtin_usage[] = {"[dirname]", "", "", "[pipeline]"};
int (*builtin_func[])(lua_State *, char ***) = {
&lush_cd, &lush_help, &lush_exit, &lush_time, &lush_lua};
int lush_num_builtins() { return sizeof(builtin_strs) / sizeof(char *); }
int lush_cd(lua_State *L, char ***args) {
uid_t uid = getuid();
struct passwd *pw = getpwuid(uid);
if (!pw) {
perror("retrieve home dir");
return 0;
}
if (args[0][1] == NULL) {
if (chdir(pw->pw_dir) != 0) {
perror("lush: cd");
}
} else {
char path[PATH_MAX];
char extended_path[PATH_MAX];
char *tilda = strchr(args[0][1], '~');
// first check if they want to go to old dir
if (strcmp("-", args[0][1]) == 0) {
strcpy(path, getenv("OLDPWD"));
} else if (tilda) {
strcpy(path, pw->pw_dir);
strcat(path, tilda + 1);
} else {
strcpy(path, args[0][1]);
}
char *exp_path = realpath(path, extended_path);
if (!exp_path) {
perror("realpath");
return 1;
}
char *cwd = getcwd(NULL, 0);
setenv("OLDPWD", cwd, 1);
free(cwd);
if (chdir(exp_path) != 0) {
perror("lush: cd");
}
}
return 0;
}
int lush_help(lua_State *L, char ***args) {
printf("%s\n", lush_get_help_text());
#ifdef LUSH_VERSION
printf("Lunar Shell, version %s\n", LUSH_VERSION);
#endif
printf("These shell commands are defined internally. Type 'help' at any "
"time to reference this list.\n");
printf("Available commands: \n");
for (int i = 0; i < lush_num_builtins(); i++) {
printf("- %s %s\n", builtin_strs[i], builtin_usage[i]);
}
return 0;
}
int lush_exit(lua_State *L, char ***args) { exit(0); }
int lush_time(lua_State *L, char ***args) {
// advance past time command
args[0]++;
// count commands
int i = 0;
while (args[i++]) {
;
}
// get time
struct timespec start, end;
double elapsed_time;
clock_gettime(CLOCK_MONOTONIC, &start);
int rc = lush_run(L, args, i);
clock_gettime(CLOCK_MONOTONIC, &end);
elapsed_time = (end.tv_sec - start.tv_sec) * 1000.0 +
(end.tv_nsec - start.tv_nsec) / 1e6;
printf("Time: %.3f milliseconds\n", elapsed_time);
// return pointer back to "time" for free()
args[0]--;
return rc;
}
int lush_lua(lua_State *L, char ***args) {
// run the lua file given
const char *script = args[0][0];
// move args forward to any command line args
args[0]++;
lua_load_script(L, script, args[0]);
// return pointer back to lua file
args[0]--;
return 0;
}
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