Addressed concerns voiced via code review - thanks

modules/grc/README.md

@@ -1,7 +1,8 @@
-grc
-===
+Generic Colouriser Module
+=========================
 
-Defines grc aliases.
+[grc](https://github.com/pengwynn/grc) takes standard input and colourises the output.
+Using regular expressions, you can create your own pattern matching colour schemes.
 
 Aliases
 -------

modules/grc/init.zsh

@@ -6,8 +6,7 @@
 #
 
 # Return if requirements are not found.
-# assumes grc was installed in /user/local/bin
-if [[ ! -h '/usr/local/bin/grc' ]] || [[ "$TERM" == dumb ]]; then
+if (( ! $+commands[grc] )) || [[ $TERM == 'dumb' ]]; then
   return 1
 fi
 
@@ -15,15 +14,15 @@ fi
 # Aliases
 #
 
-alias colourify="/usr/local/bin/grc -es --colour=auto"
+alias colourify="$commands[grc] -es --colour=auto"
 alias configure='colourify ./configure'
 # alias diff='colourify diff' # already color coded with prezto
-alias make='colourify make'
+alias make="colourify $commands[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'
+alias netstat="colourify $commands[netstat]"
+alias ping="colourify $commands[ping]"
+alias traceroute="colourify $commands[traceroute]"