chktex: use requirement

1 files changed, 17 insertions, 5 deletions

diff --git a/Library/Formula/chktex.rb b/Library/Formula/chktex.rb
index c35b2a141..55bf669c8 100644
--- a/Library/Formula/chktex.rb
+++ b/Library/Formula/chktex.rb
@@ -1,18 +1,30 @@
 require 'formula'
 
+class TexInstalled < Requirement
+  def message; <<-EOS.undent
+    A TeX/LaTeX installation is required to install.
+    You can obtain the TeX distribution for Mac OS X from:
+        http://www.tug.org/mactex/
+    EOS
+  end
+  def satisfied?
+    which 'latex'
+  end
+  def fatal?
+    true
+  end
+end
+
 class Chktex < Formula
   homepage 'http://www.nongnu.org/chktex/'
   url 'http://download.savannah.gnu.org/releases/chktex/chktex-1.7.1.tar.gz'
   sha1 'ed94b96ed8ce65fb1cef1b5fc019045c5b2dd8a8'
 
-  env :userpaths
+  depends_on TexInstalled.new
+  env :userpaths # To find TeX
 
   def install
     system "./configure", "--prefix=#{prefix}"
     system "make install"
   end
-
-  def caveats
-    "chktex requires a version of TeX, such as TeX Live or MacTeX."
-  end
 end