vweb: add .mount_static_folder_at/2 , use it instead of app.handle_static in the server_sent_events example

examples/vweb/server_sent_events/server.v

@@ -1,5 +1,6 @@
 module main
 
+import os
 import rand
 import time
 import vweb
@@ -15,7 +16,7 @@ fn main() {
 
 pub fn (mut app App) init_once() {
 	app.serve_static('/favicon.ico', 'favicon.ico', 'img/x-icon')
-	app.handle_static('.', false)
+	app.mount_static_folder_at(os.resource_abs_path('.'), '/')
 }
 
 pub fn (mut app App) index() vweb.Result {

vlib/vweb/vweb.v

@@ -575,7 +575,7 @@ fn (mut ctx Context) scan_static_directory(directory_path string, mount_path str
 	files := os.ls(directory_path) or { panic(err) }
 	if files.len > 0 {
 		for file in files {
-			full_path := directory_path + '/' + file
+			full_path := os.join_path(directory_path, file)
 			if os.is_dir(full_path) {
 				ctx.scan_static_directory(full_path, mount_path + '/' + file)
 			} else if file.contains('.') && !file.starts_with('.') && !file.ends_with('.') {
@@ -606,6 +606,19 @@ pub fn (mut ctx Context) handle_static(directory_path string, root bool) bool {
 	return true
 }
 
+// mount_static_folder_at - makes all static files in `directory_path` and inside it, available at http://server/mount_path
+// For example: suppose you have called .mount_static_folder_at('/var/share/myassets', '/assets'),
+// and you have a file /var/share/myassets/main.css .
+// => That file will be available at URL: http://server/assets/main.css .
+pub fn (mut ctx Context) mount_static_folder_at(directory_path string, mount_path string) bool {
+	if ctx.done || mount_path.len < 1 || mount_path[0] != `/` || !os.exists(directory_path) {
+		return false
+	}
+	dir_path := directory_path.trim_right('/')
+	ctx.scan_static_directory(dir_path, mount_path[1..])
+	return true
+}
+
 // Serves a file static
 // `url` is the access path on the site, `file_path` is the real path to the file, `mime_type` is the file type
 pub fn (mut ctx Context) serve_static(url string, file_path string, mime_type string) {