itk-snap: update version format, livecheck

Casks/i/itk-snap.rb

@@ -1,15 +1,9 @@
 cask "itk-snap" do
   arch arm: "arm64", intel: "x86_64"
-  livecheck_arch = on_arch_conditional arm: "M1", intel: "Intel"
 
-  on_arm do
-    version "4.0.2,13696"
-    sha256 "aba01235a44b9080fae2c5cf0b35485f96b335f1a50442ee4fb941d4c4846501"
-  end
-  on_intel do
-    version "4.0.2,13697"
-    sha256 "333071f6703e6d3a8554fcc33f2a632cf3106a0bdc230893807a4c288e9e13da"
-  end
+  version "4.0.2"
+  sha256 arm:   "aba01235a44b9080fae2c5cf0b35485f96b335f1a50442ee4fb941d4c4846501",
+         intel: "333071f6703e6d3a8554fcc33f2a632cf3106a0bdc230893807a4c288e9e13da"
 
   url "https://downloads.sourceforge.net/itk-snap/itksnap-#{version.csv.first}-Darwin-#{arch}.dmg",
       verified: "downloads.sourceforge.net/itk-snap/"
@@ -18,14 +12,12 @@ cask "itk-snap" do
   homepage "http://www.itksnap.org/pmwiki/pmwiki.php"
 
   livecheck do
-    url "http://www.itksnap.org/pmwiki/pmwiki.php?n=Main.Downloads"
-    regex(%r{
-      >\s*ITK-SNAP\s+v?(\d+(?:\.\d+)+)\s*<.*?
-      /download/snap/register\.php\?[^"' >]*?link=(\d+)[^>]*?>
-      \s*MacOS\s+Binary\s+\(#{livecheck_arch}\s+processor
-    }imx)
-    strategy :page_match do |page, regex|
-      page.scan(regex).map { |match| "#{match[0]},#{match[1]}" }
+    url "https://sourceforge.net/projects/itk-snap/rss?path=/itk-snap"
+    regex(%r{url=.*?/itksnap[._-]v?(\d+(?:\.\d+)+)(?:-(\d+(?:\.\d+)*))?[._-]Darwin[._-]#{arch}\.dmg}i)
+    strategy :sourceforge do |page, regex|
+      page.scan(regex).map do |match|
+        match[1].present? ? "#{match[0]},#{match[1]}" : match[0]
+      end
     end
   end