gws 0.1.8

patch the gws script to avoid bug introduced in
0.1.7 (StreakyCobra/gws#17)

the patch updates the 'PATH' with GNU's 'sed' and 'cut'

Library/Formula/gws.rb

@@ -1,18 +1,39 @@
 class Gws < Formula
   homepage "https://streakycobra.github.io/gws/"
   desc "Manage workspaces composed of git repositories"
-  url "https://github.com/StreakyCobra/gws/archive/0.1.7.tar.gz"
-  sha256 "36c25392f5cb93a39441a1973842249a62b605a2a7e369a040c78450683697d0"
+  url "https://github.com/StreakyCobra/gws/archive/0.1.8.tar.gz"
+  sha256 "c240601b0adcc5ae402199217fc0d5fd6775ada69919a860ad3c1c4b16805e63"
 
   depends_on "bash"
+  depends_on "coreutils" # see bug https://github.com/StreakyCobra/gws/issues/17
+  depends_on "gnu-sed" # see bug https://github.com/StreakyCobra/gws/issues/17
 
   def install
     bin.install "src/gws"
 
+    # Add GNU's 'sed' and 'cut' to PATH to fix bug
+    inreplace "#{bin}/gws" do |s|
+      s.sub! /VERSION="0.1.8"/, "VERSION=\"0.1.8\"\nexport PATH=#{gws_gnu_path}"
+    end
+
     bash_completion.install "completions/bash"
     zsh_completion.install "completions/zsh"
   end
 
+  def gws_gnu_path; <<-EOS.undent
+    "#{Formula["coreutils"].opt_libexec}/gnubin:#{Formula["gnu-sed"].opt_libexec}/gnubin:$PATH"
+    EOS
+  end
+
+  def caveats; <<-EOS.undent
+    A bug introduced in 0.1.8 (https://github.com/StreakyCobra/gws/issues/17)
+    makes gws use some options that are specific to	GNU's 'sed' and 'cut',
+    which are not available to OSX.
+
+    gws script has been updated to include GNU's sed and cut in PATH
+    EOS
+  end
+
   test do
     system "git", "init", "project"
     system "#{bin}/gws", "init"