#!/bin/bash
# color-less
# By Nathan Weizenbaum (http://nex-3.com)
# MIT License (http://www.opensource.org/licenses/mit-license.php)
#
# A quick script to make terminal-based syntax highlighting a little easier.
# The usage is the same as less, except that the first argument can be =,
# where  is any syntax CodeRay knows how to highlight.
# It'll autodetect as much as possible based on the filename.
# For example:
#
#  color-less tetris.c --quiet
#  color-less =ruby Rakefile
#  svn diff | color-less =diff
#
# Uses my CodeRay terminal encoder, available at http://pastie.caboo.se/96744.
# Check out http://nex-3.com/posts/37-terminal-syntax-highlighting

function run_coderay {
    if [ "$2" ]
    then input="$2"
    else input=/dev/stdin
    fi
    coderay "${1/=/-}" -term < $input | less -R "${args[@]}"
}

args=("$@")
if [ "${1:0:1}" = '=' ] # syntax given
then
    unset args[0]
    unset args[1]

    if [ "${2:0:1}" != - ]
    then run_coderay "$1" "$2"
    else run_coderay "$1"
    fi
elif [ "${1:0:1}" != - ] # file given
then
    case "`echo "$1" | sed 's/.*\.\([^\.]*\)$/\1/'`" in
        'rhtml' ) syn=rhtml;;
        'xml'   ) syn=xml;;
        'js'    ) syn=javascript;;
        'rb'    ) syn=ruby;;
        'c'     ) syn=c;;
        'html'  | 'xhtml' ) syn=html;;
        'lisp'  | 'el'    ) syn=lisp;;
    esac

    if [ "$syn" ]
    then
        unset args[0]
        run_coderay "-$syn" "$1"
    else less $@
    fi
else
    less $@
fi