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

#include <shell.h>

struct cmd main_cmds[] = {
	{ "flash", do_flash_cmd },
	{ "ftl", do_ftl_cmd },
	{ "mufs", do_mufs_cmd },
	{ NULL, NULL },
};

static char *prompt(const char *prefix)
{
	char *alloc, *line;
	size_t nbytes = 0, nalloc_bytes = 16;
	char c;

	printf(prefix);

	if (!(line = malloc(nalloc_bytes)))
		return NULL;

	while ((c = getchar()) && c != '\n') {
		if (nbytes + 1 >= nalloc_bytes) {
			nalloc_bytes *= 2;

			if (!(alloc = realloc(line, nalloc_bytes)))
				goto err_free_line;

			line = alloc;
		}

		line[nbytes++] = c;
	}

	line[nbytes] = '\0';

	return line;

err_free_line:
	free(line);
	return NULL;
}

void cmd_exec(struct cmd *cmds, const char *line)
{
	struct cmd *cmd;
	const char *args;
	char *key;
	size_t n;

	n = strcspn(line, " \n");
	key = strndup(line, n);

	args = line + n;
	args += strspn(args, " \n");

	for (cmd = cmds; cmd->key; ++cmd) {
		if (strcmp(cmd->key, key) == 0) {
			cmd->exec(args);
			return;
		}
	}
}

void cmd_loop(const char *show)
{
	char *line;

	while (1) {
		line = prompt(show);
		cmd_exec(main_cmds, line);
		free(line);
	}
}