implement proposal for fetching paths and retaining structure of dirs and packages (#914)

* implement proposal

* update docs and replace py-env

* more docs

* suggested proposal

* update docs

* add to_file parameter

* remove comment from Makefile

* suggested improvements

* move tests from basic to py_config

* retain leading slash from the first path

pyscriptjs/src/utils.ts

@@ -109,3 +109,12 @@ export function getAttribute(el: Element, attr: string): string | null {
     }
     return null;
 }
+
+export function joinPaths(parts: string[], separator = '/') {
+    const res = parts.map(function(part) { return part.trim().replace(/(^[/]*|[/]*$)/g, ''); }).filter(p => p!== "").join(separator || '/');
+    if (parts[0].startsWith('/'))
+    {
+        return '/'+res;
+    }
+    return res;
+}