vis-lua: allow to set window.syntax = nil

This will load the default lua color theme.

2 files changed, 6 insertions, 1 deletions

diff --git a/vis-lua.c b/vis-lua.c
index 527202d..35dbe95 100644
--- a/vis-lua.c
+++ b/vis-lua.c
@@ -537,7 +537,9 @@ static int window_newindex(lua_State *L) {
 	if (lua_isstring(L, 2)) {
 		const char *key = lua_tostring(L, 2);
 		if (strcmp(key, "syntax") == 0) {
-			const char *syntax = luaL_checkstring(L, 3);
+			const char *syntax = NULL;
+			if (!lua_isnil(L, 3))
+				syntax = luaL_checkstring(L, 3);
 			view_syntax_set(win->view, syntax);
 			return 0;
 		}
diff --git a/visrc.lua b/visrc.lua
index 48e7205..66766d3 100644
--- a/visrc.lua
+++ b/visrc.lua
@@ -196,4 +196,7 @@ vis.events.win_open = function(win)
 			end
 		end
 	end
+
+	win.syntax = nil
+
 end