add command-line arguments

6 files changed, 119 insertions, 2 deletions

diff --git a/src/gl/gl.c b/src/gl/gl.c
index 4639d48..106befe 100644
--- a/src/gl/gl.c
+++ b/src/gl/gl.c
@@ -17,6 +17,8 @@ int gl_init(lua_State *L);
 int glad_init(lua_State *L);
 int gl_terminate(lua_State *L);
 int gl_get_error(lua_State *L);
+int gl_enable(lua_State *L);
+int gl_disable(lua_State *L);
 
 void setup_gl(lua_State *L, int honey_index)
 {
@@ -26,6 +28,8 @@ void setup_gl(lua_State *L, int honey_index)
 		hs_str_cfunc("InitGlad", glad_init),
 		hs_str_cfunc("Terminate", gl_terminate),
 		hs_str_cfunc("GetError", gl_get_error),
+		hs_str_cfunc("Enable", gl_enable),
+		hs_str_cfunc("Disable", gl_disable),
 
 		/******** enums ********/
 		/* data types */
@@ -41,6 +45,9 @@ void setup_gl(lua_State *L, int honey_index)
 		hs_str_int("INVALID_OPERATION", GL_INVALID_OPERATION),
 		hs_str_int("INVALID_FRAMEBUFFER_OPERATION", GL_INVALID_FRAMEBUFFER_OPERATION),
 		hs_str_int("OUT_OF_MEMORY", GL_OUT_OF_MEMORY),
+
+		/* opengl capabilities */
+		hs_str_int("DEPTH_TEST", GL_DEPTH_TEST),
 	);
 
 	setup_shader(L, gl_index);
@@ -81,3 +88,21 @@ int gl_get_error(lua_State *L)
 	lua_pushinteger(L, glGetError());
 	return 1;
 }
+
+
+int gl_enable(lua_State *L)
+{
+	lua_Integer cap;
+	hs_parse_args(L, hs_int(cap));
+	glEnable(cap);
+	return 0;
+}
+
+
+int gl_disable(lua_State *L)
+{
+	lua_Integer cap;
+	hs_parse_args(L, hs_int(cap));
+	glDisable(cap);
+	return 0;
+}
diff --git a/src/glm/glm.c b/src/glm/glm.c
index 525a029..ca6238a 100644
--- a/src/glm/glm.c
+++ b/src/glm/glm.c
@@ -1,5 +1,6 @@
 #include <lua.h>
 #include <honeysuckle.h>
+#include "glm.h"
 
 
 void setup_glm(lua_State *L, int honey_index)
diff --git a/src/main.c b/src/main.c
index 5f5d399..304d91d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,13 +5,22 @@
 #include "gl/gl.h"
 #include "image/image.h"
 #include "glm/glm.h"
+#include "options/options.h"
 
 
 int main(int argc, char **argv)
 {
+	/* parse command-line options */
+	struct honey_options options;
+	int result = parse_options(&options, argc, argv);
+	if (result == EXIT_FAILURE) return 1;
+	else if (result == EXIT_SUCCESS) return 0;
+
+	/* set up lua state */
 	lua_State *L = luaL_newstate();
 	luaL_openlibs(L);
 
+	/* load honey bindings */
 	lua_createtable(L, 0, 2);
 	int honey_index = lua_gettop(L);
 	setup_gl(L, honey_index);
@@ -20,17 +29,22 @@ int main(int argc, char **argv)
 	setup_glm(L, honey_index);
 	lua_setglobal(L, "honey");
 
-	int err = luaL_loadfile(L, "honey.lua");
+	/* load main script */
+	int err = luaL_loadfile(L, options.script_file);
 	if (err != 0) {
-		printf("cannot open file!\n");
+		printf("cannot open file '%s'\n", options.script_file);
 		lua_close(L);
 		return 0;
 	}
+
+	/* run */
 	err = hs_call(L, 0, 0);
 	if (err != 0) {
 		const char *err_str = lua_tostring(L, -1);
 		printf("failed to run: \n%s\n", err_str);
 	}
+
+	/* clean up */
 	lua_close(L);
 	return 0;
 }
diff --git a/src/options/CMakeLists.txt b/src/options/CMakeLists.txt
new file mode 100644
index 0000000..39ed7db
--- /dev/null
+++ b/src/options/CMakeLists.txt
@@ -0,0 +1,5 @@
+project(honey_engine)
+
+target_sources(honey PUBLIC
+	${CMAKE_CURRENT_LIST_DIR}/options.c
+)
diff --git a/src/options/options.c b/src/options/options.c
new file mode 100644
index 0000000..4488837
--- /dev/null
+++ b/src/options/options.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <cargs.h>
+#include "options.h"
+
+static struct cag_option opts[] = {
+	{
+		.identifier = 's',
+		.access_letters = "s",
+		.access_name = "script",
+		.value_name = "SCRIPT_FILE",
+		.description = "The filename of the main script. (default: main.lua)"
+	},
+	{
+		.identifier = 'h',
+		.access_letters = "h",
+		.access_name = "help",
+		.value_name = NULL,
+		.description = "Shows this help message"
+	},
+};
+
+
+void print_help(char *program_name)
+{
+	printf("usage: %s [OPTIONS]\n", program_name);
+	cag_option_print(opts, CAG_ARRAY_SIZE(opts), stdout);
+}
+
+
+enum outcomes_t parse_options(struct honey_options *options, int argc, char **argv)
+{
+	/* default values */
+	options->script_file = "main.lua";
+
+	/* parse options */
+	char id;
+	const char *value;
+	cag_option_context context;
+
+	cag_option_prepare(&context, opts, CAG_ARRAY_SIZE(opts), argc, argv);
+	while(cag_option_fetch(&context)) {
+		id = cag_option_get(&context);
+		switch(id) {
+		case 's':
+			options->script_file = cag_option_get_value(&context);
+			break;
+		case 'h':
+			print_help(argv[0]);
+			return EXIT_SUCCESS;
+		default:
+			return EXIT_FAILURE;
+		}
+	}
+
+	return CONTINUE_SUCCESS;
+}
diff --git a/src/options/options.h b/src/options/options.h
new file mode 100644
index 0000000..cb07b1a
--- /dev/null
+++ b/src/options/options.h
@@ -0,0 +1,16 @@
+#ifndef HONEY_OPTIONS_H
+#define HONEY_OPTIONS_H
+
+struct honey_options {
+	const char *script_file; // main entry point
+};
+
+enum outcomes_t {
+	CONTINUE_SUCCESS,
+	EXIT_SUCCESS,
+	EXIT_FAILURE,
+};
+
+enum outcomes_t parse_options(struct honey_options *options, int argc, char **argv);
+
+#endif