ckan 1.6.6 (new formula)

Closes #234.

Signed-off-by: Xu Cheng <xucheng@me.com>

ckan.rb

@@ -0,0 +1,29 @@
+class MonoDependency < Requirement
+  fatal true
+  default_formula "mono"
+  satisfy { which("mono") }
+end
+
+class Ckan < Formula
+  homepage "https://github.com/KSP-CKAN/CKAN/"
+  # CKAN releases a raw .exe file
+  url "https://github.com/KSP-CKAN/CKAN/releases/download/v1.6.6/ckan.exe", :using => :nounzip
+  version "1.6.6"
+  sha256 "61a4f22666772ef8d5bcbf8ebc68797879fa2017042b0096636894a20e0cb0a0"
+
+  depends_on MonoDependency
+
+  def install
+    (libexec/"bin").install "ckan.exe"
+    # The usual method for running ckan.exe is `mono ckan.exe arg1 arg2 ...`
+    # This is a wrapper script for aliasing it as `ckan arg1 arg2 ...` into the PATH
+    (bin/"ckan").write <<-EOS.undent
+      #!/bin/sh
+      exec mono "#{libexec}/bin/ckan.exe" "$@"
+    EOS
+  end
+
+  test do
+    system bin/"ckan", "version"
+  end
+end