42_KFS/src/shell/exec.c

#include "kprintf.h"
#include "shell.h"
#include "string.h"
#include "terminal.h"

extern struct screen *screen;

static CMD_TOK find_command(char *line)
{
	size_t i = 0;
	bool uwu = false;
	CMD_TOK command = ERROR;

	if (!line[0])
		return command;
	while (line[i]) {
		if (line[i] == ' ') {
			uwu = true;
			break;
		}
		i++;
	}
	line[i] = '\0';
	if (!strcmp(line, "help"))
		command = HELP;
	else if (!strcmp(line, "reboot"))
		command = REBOOT;
	else if (!strcmp(line, "poweroff"))
		command = POWEROFF;
	else if (!strcmp(line, "halt"))
		command = HALT;
	else if (!strcmp(line, "stack"))
		command = STACK;
	else if (!strcmp(line, "clear"))
		command = CLEAR;
	else if (!strcmp(line, "echo"))
		command = ECHO;
	else if (!strcmp(line, "color"))
		command = COLOR;
	else if (!strcmp(line, "merdella"))
		command = MERDELLA;
	else if (!strcmp(line, "date"))
		command = DATE;
	else
		kprintf(0, "invalid command: %s\n", line);
	if (uwu)
		line[i] = ' ';
	return command;
}

static void read_line(void)
{
	size_t i = 0;
	struct key_event ev;
	uint8_t prev_scan_code = 0;

	while (1) {
		ev = terminal_getkey();
		if (ev.c == '\n')
			break;
		char *buf = screen->line;
		i = strlen(screen->line);
		const size_t size = sizeof(screen->line);
		if (prev_scan_code != ev.scan_code && ev.scan_code) {
			if (ev.scan_code == KEY_BACKSPACE && i) {
				buf[--i] = '\0';
				move_cursor(LEFT);
				terminal_putchar(' ');
				move_cursor(LEFT);
			}
			if (ev.c && i < size - 1) {
				kprintf(0, "%c", ev.c);
				buf[i++] = ev.c;
			}
			if (i >= size)
				break;
		}
		prev_scan_code = ev.scan_code;
	}
	kprintf(0, "\n");
	screen->line[i] = '\0';
}

void shell_init(void)
{
	while (1) {
		kprintf(0, PROMPT);
		read_line();
		switch (find_command(screen->line)) {
		case HELP:
			kprintf(0, "Welcome to bozOShell, the shell of "
			           "bozOS\nAvailable commands: help, reboot, "
			           "poweroff, echo, color, merdella\n");
			break;
		case REBOOT:
			reboot();
			break;
		case POWEROFF:
			kprintf(0, "powering off\n");
			break;
		case HALT:
			halt();
			break;
		case STACK:
			print_stack();
			break;
		case CLEAR:
			terminal_clear();
			break;
		case ECHO:
			kprintf(0, "echoing\n");
			break;
		case COLOR:
			kprintf(0, "coloring\n");
			break;
		case MERDELLA: {
			kprintf(0, POOP);
			if (!strcmp("merdella --credits", screen->line))
				kprintf(
				    0,
				    "\nThis ascii masterpiece has been created "
				    "by Targon (/)\n");
			break;
		}
		case DATE:
			date();
			break;
		case ERROR:
			break;
		default:
			break;
		}
		memset(screen->line, '\0', sizeof(screen->line));
	}
}