grc - update rc script

* Don't use DATA to write out the rc script
 * Put it in prefix/etc instead of etc

Formula/grc.rb

@@ -15,30 +15,32 @@ class Grc <Formula
     (share+'grc').install Dir['conf.*']
     man1.install %w[grc.1 grcat.1]
 
-    (etc+'grc.bashrc').write DATA.read rescue RuntimeError
+    (prefix+'etc/grc.bashrc').write rc_script
+  end
+
+  def rc_script; <<-EOS.undent
+    GRC=`which grc`
+    if [ "$TERM" != dumb ] && [ -n GRC ]
+    then
+        alias colourify="$GRC -es --colour=auto"
+        alias configure='colourify ./configure'
+        alias diff='colourify diff'
+        alias make='colourify make'
+        alias gcc='colourify gcc'
+        alias g++='colourify g++'
+        alias as='colourify as'
+        alias gas='colourify gas'
+        alias ld='colourify ld'
+        alias netstat='colourify netstat'
+        alias ping='colourify ping'
+        alias traceroute='colourify /usr/sbin/traceroute'
+    fi
+    EOS
   end
 
   def caveats; <<-EOS.undent
     New shell sessions will start using GRC after you run the following command:
-      echo 'source "`brew --prefix`/etc/grc.bashrc"' >> ~/.bashrc
+      echo 'source "`brew --prefix grc`/etc/grc.bashrc"' >> ~/.bashrc
     EOS
   end
 end
-
-__END__
-GRC=`which grc`
-if [ "$TERM" != dumb ] && [ -n GRC ]
-then
-    alias colourify="$GRC -es --colour=auto"
-    alias configure='colourify ./configure'
-    alias diff='colourify diff'
-    alias make='colourify make'
-    alias gcc='colourify gcc'
-    alias g++='colourify g++'
-    alias as='colourify as'
-    alias gas='colourify gas'
-    alias ld='colourify ld'
-    alias netstat='colourify netstat'
-    alias ping='colourify ping'
-    alias traceroute='colourify /usr/sbin/traceroute'
-fi