main.c
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main.c
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	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <libgen.h>
	#include <unistd.h>
	#include <argtable3.h>

	#include "ant.h"
	#include "config.h"
	#include "runtime.h"
	#include "repl.h"

	#include "modules/builtin.h"
	#include "modules/io.h"
	#include "modules/fs.h"
	#include "modules/crypto.h"
	#include "modules/server.h"
	#include "modules/timer.h"
	#include "modules/json.h"
	#include "modules/fetch.h"
	#include "modules/shell.h"
	#include "modules/process.h"
	#include "modules/path.h"
	#include "modules/ffi.h"

	int js_result = EXIT_SUCCESS;

	static void eval_code(struct js js, struct arg_str eval, struct arg_lit *print) {
	const char *script = eval->sval[0];
	size_t len = strlen(script);

	js_set_filename(js, "<eval>");
	js_mkscope(js);
	js_protect_init_memory(js);

	jsval_t result = js_eval(js, script, len);

	if (js_type(result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, result));
	js_result = EXIT_FAILURE;
	} else if (print->count > 0) {
	const char *str = js_str(js, result);
	if (str && strcmp(str, "undefined") != 0) printf("%s\n", str);
	}

	js_run_event_loop(js);
	}

	static int execute_module(struct js js, const char filename) {
	char *filename_copy = strdup(filename);
	char *dir = dirname(filename_copy);

	js_set(js, js_glob(js), "__dirname", js_mkstr(js, dir, strlen(dir)));
	free(filename_copy);

	FILE *fp = fopen(filename, "rb");
	if (fp == NULL) {
	fprintf(stderr, "Error: Could not open file '%s'\n", filename);
	return EXIT_FAILURE;
	}

	fseek(fp, 0, SEEK_END);
	long file_size = ftell(fp);
	fseek(fp, 0, SEEK_SET);

	char *buffer = malloc(file_size + 1);
	if (buffer == NULL) {
	fprintf(stderr, "Error: Memory allocation failed\n");
	fclose(fp);
	return EXIT_FAILURE;
	}

	size_t len = fread(buffer, 1, file_size, fp);
	fclose(fp);
	buffer[len] = '\0';

	js_set_filename(js, filename);
	js_setup_import_meta(js, filename);

	js_mkscope(js);
	js_protect_init_memory(js);

	jsval_t result = js_eval(js, buffer, len);
	free(buffer);

	if (js_type(result) == JS_ERR) {
	fprintf(stderr, "%s\n", js_str(js, result));
	return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
	}

	int main(int argc, char *argv[]) {
	char dump = 0;

	struct arg_lit *help = arg_lit0("h", "help", "display this help and exit");
	struct arg_lit *version = arg_lit0("v", "version", "display version information and exit");
	struct arg_lit *debug = arg_litn("d", "debug", 0, 10, "dump VM state (can be repeated for more detail)");
	struct arg_str *eval = arg_str0("e", "eval", "<script>", "evaluate script");
	struct arg_lit *print = arg_lit0("p", "print", "evaluate script and print result");
	struct arg_int *gct = arg_int0(NULL, "gct", "<threshold>", "set garbage collection threshold");
	struct arg_int *initial_mem = arg_int0(NULL, "initial-mem", "<size>", "initial memory size in MB (default: 4)");
	struct arg_int *max_mem = arg_int0(NULL, "max-mem", "<size>", "maximum memory size in MB (default: 512)");
	struct arg_file *file = arg_file0(NULL, NULL, "<module.js>", "JavaScript module file to execute");
	struct arg_end *end = arg_end(20);

	void *argtable[] = {help, version, debug, eval, print, gct, initial_mem, max_mem, file, end};
	int nerrors = arg_parse(argc, argv, argtable);

	if (help->count > 0) {
	printf("Ant sized JavaScript\n\n");
	printf("Usage: ant [options] [module.js]\n\n");
	printf("If no module file is specified, ant starts in REPL mode.\n\n");
	printf("Options:\n");
	arg_print_glossary(stdout, argtable, " %-25s %s\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_SUCCESS;
	}

	if (version->count > 0) {
	printf("ant %s (%s %s) [release]\n", ANT_VERSION, ANT_BUILD_DATE, ANT_GIT_HASH);
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_SUCCESS;
	}

	if (nerrors > 0) {
	arg_print_errors(stdout, end, "ant");
	printf("Try 'ant --help' for more information.\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_FAILURE;
	}

	bool repl_mode = (file->count == 0 && eval->count == 0);
	const char *module_file = repl_mode ? NULL : (file->count > 0 ? file->filename[0] : NULL);
	dump = debug->count;

	size_t initial_size = 4 * 1024 * 1024;
	size_t max_size = 512 * 1024 * 1024;

	if (initial_mem->count > 0) initial_size = (size_t)initial_mem->ival[0] * 1024 * 1024;
	if (max_mem->count > 0) max_size = (size_t)max_mem->ival[0] * 1024 * 1024;

	struct js *js = js_create_dynamic(initial_size, max_size);

	if (js == NULL) {
	fprintf(stderr, "Error: Failed to allocate JavaScript runtime\n");
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));
	return EXIT_FAILURE;
	}

	if (gct->count > 0) js_setgct(js, gct->ival[0]);

	ant_runtime_init(js);

	init_builtin_module();
	init_crypto_module();
	init_fetch_module();
	init_console_module();
	init_json_module();
	init_server_module();
	init_timer_module();
	init_process_module();

	ant_register_library("ant:fs", fs_library);
	ant_register_library("ant:shell", shell_library);
	ant_register_library("ant:path", path_library);
	ant_register_library("ant:ffi", ffi_library);

	if (eval->count > 0) eval_code(js, eval, print);
	else if (repl_mode) ant_repl_run(); else {
	js_result = execute_module(js, module_file);
	js_run_event_loop(js);
	}

	if (dump) js_dump(js);

	js_destroy(js);
	arg_freetable(argtable, sizeof(argtable) / sizeof(argtable[0]));

	return js_result;
	}

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