#!/usr/bin/env bash

usage() {
	echo "Usage: command | group-and-termgraph

takes data from STDIN
groups it and graphs it in your terminal using termgraph:
https://github.com/mkaz/termgraph

This can be thought of as a fancy 'sort | uniq -c | sort'"
}

if [[ "$1" == '-h' ]]; then
	usage
	exit 0
fi

set -e
set -o pipefail

havecmd -v rev || exit $?
havecmd -v awk || exit $?
havecmd -v sed || exit $?
havecmd -V 'Install from https://github.com/purarue/chomp' 'chomp' || exit $?
havecmd -V 'Install with "pip install termgraph"' 'termgraph' || exit $?

# this uses '|@|' as a special marker to replace commas with
# and then replaces them afterwards once things have been graphed
#
# remove extra spaces, count using 'uniq -c', and replace commas (used as a delimtier for termgraph) with '|@|'
chomp | sort | uniq -c | chomp | sed -e 's/,/|@|/g' |
	# move the first column (count) to the end, print the rest of the columns first
	awk '{for(i=2;i<=NF;i++){printf "%s ", $i}; printf $1; printf "\n"}' |
	# replace the last space with a comma (the termgraph delimiter)
	rev | sed -e 's/ /,/' | rev |
	# graph with termgraph
	termgraph --delim ',' "$@" |
	# remove extra lines termgraph prints, reset commas that were there in original text
	# sort by last column
	chomp | sed -e 's/|@|/,/g' | sort-by-last-col