From af6c4ffbccfbdfe3f9e260ba679886364c727c41 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pjm@nac.net>
Date: Sat, 16 Nov 2013 01:00:31 -0500
Subject: Add basic scripting interface.

---
diff --git a/src/local.mk b/src/local.mk
index 76b986d..1950fee 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -16,6 +16,8 @@ sdlex_SOURCES += \
 	src/main.c \
 	src/palettes.c \
 	src/palettes.h \
+	src/script.c \
+	src/script.h \
 	src/viewport.c \
 	src/viewport.h \
 	src/xml.c \
diff --git a/src/script.c b/src/script.c
new file mode 100644
index 0000000..cb1baf6
--- /dev/null
+++ b/src/script.c
@@ -0,0 +1,67 @@
+/*
+ * 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 <stdlib.h>
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include "logging.h"
+#include "script.h"
+
+/* LUA_OK is defined in Lua 5.2 but not 5.1. */
+#ifndef LUA_OK
+#define LUA_OK 0
+#endif
+
+struct script *
+script_load(const char *path)
+{
+	struct script *s;
+
+	s = malloc(sizeof(*s));
+	if (s == NULL) {
+		err(1, "Failed to allocate script");
+	}
+	s->path = path;
+
+	/* 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));
+	}
+
+	return s;
+}
+
+void
+script_call(struct script *s, const char *func)
+{
+	lua_getglobal(s->lua_state, func);
+	if (lua_pcall(s->lua_state, 0, 0, 0) != LUA_OK) {
+		err(1, "Error calling function: %s\n",
+				lua_tostring(s->lua_state, -1));
+	}
+}
diff --git a/src/script.h b/src/script.h
new file mode 100644
index 0000000..662c8ea
--- /dev/null
+++ b/src/script.h
@@ -0,0 +1,32 @@
+/*
+ * 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 SCRIPT_H
+#define SCRIPT_H
+
+#include <lua.h>
+
+struct script {
+	const char *path;
+	lua_State *lua_state;
+};
+
+struct script *script_load(const char *path);
+void script_call(struct script *s, const char *func);
+
+#endif
--
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