Merge pull request #21 from konovod/patch-1

On Windows OS , use `webview.dll` and do a dynamic link. Thanks @konovod for this PR

Author: naqvis

README.md

@@ -27,6 +27,14 @@ BSD-based systems:
 
 * FreeBSD packages: `pkg install webkit2-gtk3`
 * Execution on BSD-based systems may require adding the `wxallowed` option (see [mount(8)](https://man.openbsd.org/mount.8))  to your fstab to bypass [W^X](https://en.wikipedia.org/wiki/W%5EX "write xor execute") memory protection for your executable. Please see if it works without disabling this security feature first.
+
+Microsoft Windows:
+
+* You should have Visual C++ Build tools already as it's a pre-requisite for crystal compiler
+* `git clone https://github.com/webview/webview` to get WebView sources
+* `webview\script\build.bat` to compile them (it will download required nuget package)
+* copy `webview\dll\x64\webview.lib` to `<your crystal installation>\lib`
+* copy `webview\dll\x64\webview.dll` to directory with your program
 
 ## Installation
 

shard.yml

@@ -1,5 +1,5 @@
 name: webview
-version: 0.2.1
+version: 0.2.2
 
 authors:
   - Ali Naqvi <syed.alinaqvi@gmail.com>

src/lib.cr

@@ -6,10 +6,10 @@ module Webview
     @[Link(ldflags: "`command -v pkg-config > /dev/null && pkg-config --cflags --libs gtk+-3.0 webkit2gtk-4.0`")]
     @[Link(ldflags: "#{__DIR__}/../ext/libwebview.a -lstdc++")]
   {% elsif flag?(:windows) %}
-    # Windows requires special linker flags for GUI apps.
-    @[Link(ldflags: "-L#{__DIR__}/../ext -lwebview.o -lc++")]
-    @[Link(ldflags: "-lole32 -lcomctl32 -loleaut32 -luuid -lgdi32 -H windowsgui")]
-  {% else %}
+    @[Link("webview")]
+    # TODO - Windows requires special linker flags for GUI apps, but this doesn't work with crystal stdlib (tried with Crystal 1.6.2).
+    # @[Link(ldflags: "/subsystem:windows")]
+    {% else %}
     raise "Platform not supported"
   {% end %}
   lib LibWebView

src/webview.cr

@@ -2,7 +2,7 @@ require "json"
 
 # Crystal bindings for [zserge's Webview](https://github.com/zserge/webview) which is an excellent cross-platform single header webview library for C/C++ using Gtk, Cocoa or MSHTML repectively.
 module Webview
-  VERSION = "0.2.1"
+  VERSION = "0.2.2"
 
   # Window size hints
   enum SizeHints