add javascript binding and file picker for web

src/app.cpp

@@ -26,6 +26,8 @@ void destroy_window();
 #elif __LINUX__
 std::string linux_home_path();
 int mkpath(const std::string& dir, mode_t mode = DEFFILEMODE);
+#elif __WEB__
+#include <unistd.h>
 #endif
 
 App* App::I = nullptr; // singleton
@@ -52,7 +54,7 @@ void App::create()
 
 void App::open_document(std::string path)
 {
-    std::regex r(R"((.*)[\\/]([^\\/]+)\.(\w+)$)");
+    std::regex r(R"((.*)[\\/]?([^\\/]+)\.(\w+)$)");
     std::smatch m;
     if (!std::regex_search(path, m, r))
         return;
@@ -236,6 +238,14 @@ void App::initLog()
     mkpath(data_path + "/patterns/thumbs");
     mkpath(data_path + "/settings");
     mkpath(data_path + "/frames");
+#elif __WEB__
+    data_path = "/";
+    mkdir("/brushes", 0777);
+    mkdir("/brushes/thumbs", 0777);
+    mkdir("/patterns", 0777);
+    mkdir("/patterns/thumbs", 0777);
+    mkdir("/settings", 0777);
+    mkdir("/frames", 0777);
 #endif
 
     // TODO: save this path somewhere in the settings, don't overwrite every start