Some improvements

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    webview_ruby (0.1.0)
+    webview_ruby (0.1.1)
       ffi
       ffi-compiler
       rake
@@ -10,9 +10,9 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    ffi (1.15.5)
-    ffi-compiler (1.0.1)
-      ffi (>= 1.0.0)
+    ffi (1.17.0-x86_64-linux-gnu)
+    ffi-compiler (1.3.2)
+      ffi (>= 1.15.5)
       rake
     minitest (5.15.0)
     parallel (1.21.0)
@@ -39,6 +39,7 @@ GEM
 PLATFORMS
   arm64-darwin-20
   arm64-darwin-21
+  x86_64-linux
 
 DEPENDENCIES
   minitest (~> 5.0)

README.md

@@ -57,6 +57,7 @@ You can bind a ruby function to a JavaScript one before the webview is in runnin
 ```ruby
 webview.bind("exampleFunc") do
   print("got called by js")
+  "returned string" #do not use "return" as keyword, because that exits the current thread
 end
 ```
 
@@ -71,6 +72,14 @@ end
 
 You can only use positional arguments, keyword ones wouldn't work.
 
+To get the return value in javascript, do the following:
+
+```javascript
+exampleFunc('a','b').then(result => {
+  alert(result);
+})
+```
+
 ### Run JS code from ruby
 
 You can invoke JS code to be run asynchrounously (the result of the execution won't be returned to you) by running
@@ -95,6 +104,11 @@ webview.init("console.log('running at initialisation')")
 
 It is guaranteed that code is executed before window.onload.
 
+## Caveats
+* you can only open new windows (next to the main window) via a new ruby process
+  * the new created window is not stacked to the other in the task bar
+* popups don't work
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/Maaarcocr/webview_ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/[USERNAME]/webview_ruby/blob/master/CODE_OF_CONDUCT.md).

ext/Rakefile

@@ -6,8 +6,8 @@ FFI::Compiler::CompileTask.new('webview-ext') do |c|
     c.cxxflags << "-std=c++11"
     c.ldflags << "-framework WebKit"
   elsif RbConfig::CONFIG['host_os'] =~ /linux/
-    c.cxxflags << `pkg-config --cflags gtk+-3.0 webkit2gtk-4.0`.strip
-    c.ldflags << `pkg-config --libs gtk+-3.0 webkit2gtk-4.0`.strip
+    c.cxxflags << `pkg-config --cflags gtk+-3.0 webkit2gtk-4.1`.strip
+    c.ldflags << `pkg-config --libs gtk+-3.0 webkit2gtk-4.1`.strip
   else
     puts "Unsupported operating system prolly windows, check rake file in ext directory in source code and add correct flags from here  https://github.com/webview/webview#webview-for-cc-developers "
   end

lib/webview_ruby.rb

@@ -16,6 +16,7 @@ module WebviewRuby
   attach_function :webview_navigate, [:pointer, :string], :void
   attach_function :webview_destroy, [:pointer], :void
   attach_function :webview_bind, [:pointer, :string, :pointer, :pointer], :void
+  attach_function :webview_return, [:pointer, :string, :int, :string], :void
   attach_function :webview_eval, [:pointer, :string], :void
   attach_function :webview_init, [:pointer, :string], :void
 
@@ -61,9 +62,10 @@ def bind(name, func=nil, &block)
           if func
             func(*params)
           else
-            block.call(*params)
+            result = block.call(*params)
+            WebviewRuby.webview_return(@window, seq, 0, result.to_json)
           end
-        rescue StandardError => e
+        rescue Exception => e
           print("Error occured: #{e.full_message}. \n\n Going to terminate\n")
           terminate
         end