--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/glib_io.c	Sun Feb 01 21:28:57 2009 +0200
@@ -0,0 +1,78 @@
+
+#include <lua.h>
+#include <lauxlib.h>
+#include <glib.h>
+#include <stdio.h>    // popen, pclose, fileno
+
+#include "util.h"
+#include "glib_types.h"
+
+static gchar lglib_io_buffer[128];
+
+void lglib_io_callback_destroy (lglib_io_callback_t *cb)
+{
+	luaL_unref (cb->L, LUA_REGISTRYINDEX, cb->reference);
+	pclose (cb->fd);
+	luaL_free (cb->L, cb);
+}
+
+// data/nil
+static gboolean lglib_io_callback (GIOChannel *source, GIOCondition *condition, lglib_io_callback_t *cb)
+{
+	gsize read = 0;
+	int status;
+	lua_rawgeti (cb->L, LUA_REGISTRYINDEX, cb->reference);
+	status = g_io_channel_read_chars (source, lglib_io_buffer, 128, &read, NULL);
+	if (read) {
+		lua_pushlstring (cb->L, lglib_io_buffer, read);
+	} else if (status == G_IO_STATUS_EOF) {
+		lua_pushnil (cb->L);
+	} else {
+		return status != G_IO_STATUS_ERROR;
+	}
+	if (lua_pcall (cb->L, 1, 1, 0))
+		lua_error (cb->L);
+	return lua_toboolean (cb->L, -1);
+}
+
+// command function
+static int lglib_io_new (lua_State *L)
+{
+	const char *command = luaL_checkstring (L, 1);
+	lglib_io_callback_t *cb;
+	FILE *fd;
+	GIOChannel *channel;
+	//const char *charset;
+	luaL_argcheck (L, lua_isfunction (L, 2), 2, "function expected");
+
+	fd = popen (command, "r");
+	if (!fd) {
+		lua_pushstring (L, "Error opening pipe");
+		lua_error (L);
+	}
+	channel = g_io_channel_unix_new (fileno (fd));
+	//if (!g_get_charset (&charset))
+	//	g_io_channel_set_encoding (channel, charset, NULL);
+
+	cb = luaL_malloc (L, sizeof (lglib_io_callback_t));
+	cb->reference = luaL_ref (L, LUA_REGISTRYINDEX);
+	cb->L         = L;
+	cb->fd        = fd;
+
+	g_io_add_watch_full (channel, G_PRIORITY_HIGH_IDLE, G_IO_IN,
+				(GSourceFunc)lglib_io_callback, cb,
+				(GDestroyNotify)lglib_io_callback_destroy);
+	return 0;
+}
+
+static const luaL_Reg lglib_io_reg_f[] = {
+	{ "new", lglib_io_new },
+	{ NULL,  NULL         },
+};
+
+int luaopen_glib_io (lua_State *L)
+{
+	luaL_register (L, "g.io", lglib_io_reg_f);
+	return 1;
+}
+