Ensure example image resources are available

Re-try commit

Author: vidartf

.gitignore

@@ -31,5 +31,6 @@ htmlcov/
 
 docs/source/_static/jupyter-threejs.js
 docs/source/_static/three.js
+docs/source/examples/img
 
 js/lab-dist

js/scripts/copy-files.js

@@ -12,6 +12,9 @@ const staticDir = path.resolve(baseDir, '..', 'pythreejs', 'static');
 const buildDir = path.resolve(baseDir, 'dist');
 const docStaticDir = path.resolve(baseDir, '..', 'docs', 'source', '_static');
 
+const exampleImagesSrcDir = path.resolve(baseDir, '..', 'examples', 'img');
+const exampleImagesDstDir = path.resolve(docStaticDir, 'examples', 'img');
+
 
 function copyThree() {
     return fse.copy(
@@ -31,10 +34,25 @@ function copyBundleToDocs() {
     });
 }
 
+function copyExampleImagesToDocs() {
+    return fse.readdir(exampleImagesSrcDir).then((dirFiles) => {
+        return Promise.all(dirFiles.map(filePath => {
+            return fse.copy(
+                path.resolve(exampleImagesSrcDir, filePath),
+                path.resolve(exampleImagesDstDir, filePath)
+            ).then(function() {
+                console.log(`Copied ${filePath} to docs examples' image folder`);
+            });
+        }));
+    });
+}
+
+
 if (require.main === module) {
     // This script copies files after a build
     Promise.all([
         copyThree(),
         copyBundleToDocs(),
+        copyExampleImagesToDocs(),
     ]);
 }