From 561710c24d23dbd80300fc2a3ffb7939204b3a6a Mon Sep 17 00:00:00 2001
From: Harold Thetiot <hthetiot@gmail.com>
Date: Wed, 28 Feb 2018 14:11:29 -0800
Subject: [PATCH] add data-packages-strategy param support and set
 defaultStrategy to 'flat'

---
 bootstrap.js    | 56 ++++++++++++++++++++++++++++++-------------------
 demo/index.html |  2 +-
 2 files changed, 35 insertions(+), 23 deletions(-)

diff --git a/bootstrap.js b/bootstrap.js
index 1f8c9486..01c955e7 100644
--- a/bootstrap.js
+++ b/bootstrap.js
@@ -195,6 +195,7 @@
                         }
                     },
                     "promise": {
+                        "exports": Promise,
                         global: "Promise",
                         export: "Promise",
                         location: "node_modules/bluebird/js/browser/bluebird.min.js",
@@ -206,6 +207,10 @@
                     }
                 };
 
+                function moduleHasExport(module) {
+                    return module.exports !== null && module.exports !== void 0;
+                }
+
                 function bootModule(id) {
                     //console.log('bootModule', id, factory);
 
@@ -217,7 +222,7 @@
 
                     if (
                         module && 
-                            typeof module.exports === "undefined"  && 
+                            moduleHasExport(module) === false && 
                                 typeof module.factory === "function"
                     ) {
                         module.exports = module.factory(bootModule, (module.exports = {})) || module.exports;
@@ -268,26 +273,35 @@
                     callback(mrRequire, mrPromise, miniURL);
                 }
 
-                function bootstrapModuleScript(module, err, script) {
-                    if (err) {
-                        // Fallback on flat strategy for missing nested module
-                        if (module.strategy === 'nested') {
-                            module.strategy = 'flat';
-                            module.script = resolveUrl(resolveUrl(location, '../../'), module.location);
-                            loadScript(module.script, bootstrapModuleScript.bind(null, module));
-                        } else {
-                            throw err;   
-                        }
-                    } else if (module.export || module.global) {
-
-                        bootstrapModule(module.id, function (bootRequire, exports) {
-                            if (module.export) {
-                                exports[module.export] = global[module.global]; 
+                // This define if the script should be loaded has "nested" of "flat" dependencies in packagesLocation.
+                // Change to "nested" for npm 2 support or add data-packages-strategy="nested" on montage.js script tag.
+                var defaultStrategy = params.packagesStrategy || 'nested'; 
+
+                function bootstrapModuleScript(module, strategy) {
+                    module.strategy = strategy || defaultStrategy; 
+                    var locationRoot = strategy === "flat" ? params.packagesLocation : params.location;
+                    module.script = resolveUrl(locationRoot, module.location);
+                    loadScript(module.script, function (err, script) {
+                        if (err) {
+                            if (module.strategy === defaultStrategy) {
+                                var nextStrategy = module.strategy === 'flat' ? 'nested' : 'flat';
+                                bootstrapModuleScript(module, nextStrategy);
                             } else {
-                                return global[module.global];
+                                throw err;
                             }
-                        });
-                    }
+                        } else if (module.export || module.global) {
+                            defaultStrategy = module.strategy;
+                            bootstrapModule(module.id, function (bootRequire, exports) {
+                                if (module.export) {
+                                    exports[module.export] = global[module.global]; 
+                                } else {
+                                    return global[module.global];
+                                }
+                            });
+                        } else if (!module.factory && !module.exports) {
+                            throw new Error('Unable to load module ' + module.id);
+                        }
+                    });
                 }
 
                 // Expose bootstrap
@@ -319,9 +333,7 @@
                         } else if (typeof module.shim !== "undefined") {
                             bootstrapModule(module.id, module.shim);
                         } else {
-                            module.strategy = "nested";
-                            module.script = resolveUrl(location, module.location);
-                            loadScript(module.script, bootstrapModuleScript.bind(null, module));
+                            bootstrapModuleScript(module);
                         }
                     }
                 } 
diff --git a/demo/index.html b/demo/index.html
index 4cff6ba0..80c942fe 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -4,7 +4,7 @@
     <title>Mr demo</title>
     <style type="text/css"> body { font-family: sans-serif; } </style>
 
-    <script src="../node_modules/mr/bootstrap.js" data-module="index"></script>
+    <script src="../bootstrap.js" data-module="index"></script>
 </head>
 <body>
     <h1>Hello Mr</h1>