Manage scripts as resources

3 files changed, 117 insertions, 0 deletions

diff --git a/src/resources/local.mk b/src/resources/local.mk
index 5858ec6..f5d20d2 100644
--- a/src/resources/local.mk
+++ b/src/resources/local.mk
@@ -7,6 +7,8 @@ boukengine_SOURCES += \
 	src/resources/palette.h \
 	src/resources/resource.c \
 	src/resources/resource.h \
+	src/resources/script.c \
+	src/resources/script.h \
 	src/resources/tileset.c \
 	src/resources/tileset.h \
 	src/resources/tmx.c \
diff --git a/src/resources/script.c b/src/resources/script.c
new file mode 100644
index 0000000..5212219
--- /dev/null
+++ b/src/resources/script.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2013  Patrick "P. J." McDermott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include "../logging.h"
+#include "../viewport.h"
+#include "script.h"
+#include "resource.h"
+
+/* LUA_OK is defined in Lua 5.2 but not 5.1. */
+#ifndef LUA_OK
+#define LUA_OK 0
+#endif
+
+static struct resource_table script_res;
+
+struct script *
+script_get(const char *path)
+{
+	struct script *s;
+
+	s = (struct script *) resource_get(&script_res, path);
+	if (s != NULL) {
+		resource_use((struct resource *) s);
+		return s;
+	}
+
+	s = resource_alloc(path, sizeof(*s));
+
+	/* Load the script. */
+	s->lua_state = luaL_newstate();
+	luaL_openlibs(s->lua_state);
+	if (luaL_loadfile(s->lua_state, path) != LUA_OK) {
+		err(1, "Error loading script: %s\n",
+				lua_tostring(s->lua_state, -1));
+	}
+
+	/* Run the script once to let it define functions. */
+	if (lua_pcall(s->lua_state, 0, 0, 0) != LUA_OK) {
+		err(1, "Error running script: %s\n",
+				lua_tostring(s->lua_state, -1));
+	}
+
+	lua_register(s->lua_state, "init_viewport", init_viewport_lua);
+
+	resource_use((struct resource *) s);
+	resource_add(&script_res, path, (struct resource *) s);
+
+	return s;
+}
+
+void
+script_free(struct script *script)
+{
+	lua_State *data;
+
+	if (script == NULL) {
+		return;
+	}
+
+	data = script->lua_state;
+	if (resource_free(&script_res, (struct resource *) script)) {
+		lua_close(data);
+	}
+}
diff --git a/src/resources/script.h b/src/resources/script.h
new file mode 100644
index 0000000..12dac85
--- /dev/null
+++ b/src/resources/script.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2013  Patrick "P. J." McDermott
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef RESOURCES_SCRIPT_H
+#define RESOURCES_SCRIPT_H
+
+#include <lua.h>
+#include "resource.h"
+
+struct script {
+	struct resource res;
+	lua_State *lua_state;
+};
+
+struct script *script_get(const char *path);
+void script_free(struct script *script);
+
+#endif