From fcfa9dafbd6cc57c9259d0f0ae5f3aaa32ddd8d1 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Wed, 27 Sep 2017 23:05:03 +1000
Subject: src/loadlib.js: Use sourceURL to get path in debugger+tracebacks

---
 src/loadlib.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/loadlib.js b/src/loadlib.js
index a7b27af..e7626ab 100644
--- a/src/loadlib.js
+++ b/src/loadlib.js
@@ -38,14 +38,19 @@ const AUXMARK       = [1];
 let lsys_load;
 if (WEB) {
     lsys_load = function(L, path, seeglb) {
+        path = lua.to_jsstring(path);
         let xhr = new XMLHttpRequest();
-        xhr.open("GET", lua.to_jsstring(path), false);
+        xhr.open("GET", path, false);
         xhr.send();
 
         if (xhr.status >= 200 && xhr.status <= 299) {
+            let code = xhr.response;
+            /* Add sourceURL comment to get path in debugger+tracebacks */
+            if (!/\/\/[#@] sourceURL=/.test(code))
+                code += " //# sourceURL=" + path;
             let func;
             try {
-                func = Function("fengari", xhr.response);
+                func = Function("fengari", code);
             } catch (e) {
                 lua.lua_pushstring(L, lua.to_luastring(`${e.name}: ${e.message}`));
                 return null;
-- 
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