Console output highlighter for Linux

highlight.me

#! /bin/sh

# Highlight.ME - console output higlighter
# Copyright (c) 2016 Levi Taule
# 
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the authors be held liable for any damages
# arising from the use of this software.
# 
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
# 
# 1. The origin of this software must not be misrepresented; you must not
#    claim that you wrote the original software. If you use this software
#    in a product, an acknowledgement in the product documentation would be
#    appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
#    misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.

# Usage: ./higlight.me 'COMMAND' words to highlight divided by space
# example: ./highlight.me 'git --help' help


# Write out the output of the program to the temporary file 'tmp'
$1 >tmp 
shift

y=0
command=""

for var in "$@"
do
	# Create the expression
	d='"('
	for a in "$@"
	do
		d=$d$a"|"
	done
	# Removing trailing '|'
	d=${d%?}
	d=$d')"'
	shift

	# What to color. The first pass takes the contents of our 'tmp', the other ones operate on top of that
	what=""
	if [ "$y" -eq 0 ]
	then
		what='tmp'
	else
		what='-A10000 -B10000'
	fi
	
	# Choose a nice color
	n=$((32+$y))
	
	# Glue it all together
	# '-i' is for "case-insensitive"
	command=$command"GREP_COLOR='1;$n' grep -P -i $d --color=always $what | "

	 y=$((y+1))
done

# There is trailing ' | ' we want to remove
for a in [1, 2, 3]
do
	command=${command%?}
done

# Finally execute the command
cat tmp
eval $command

rm -rf tmp