advent-day-1.sh

#!/bin/bash

# expects data as first parameter

# http://adventofcode.com/
# day 1 (1 & 2)

# a bit slow, but I wanted to to this in bash ;)

up=0
down=0
f=0
p=0
DATA=$1
firstBasementPos=-1

for (( i=0; i<${#DATA}; i++ ))
do
	a=${DATA:$i:1}
	if [ "$a" == "(" ]
	then
		let f=f+1
		let up=up+1
	else
		if [ "$a" == ")" ]
		then
			let f=f-1
			let down=down-1
		fi
	fi
	let p=p+1
	if [[ f -lt 0 ]] && [[ firstBasementPos -eq -1 ]]
	then
		let firstBasementPos=p
	fi
done
echo UP:$up DOWN:$down FLOOR:$f POS:$p FIRSTBASEMENT:$firstBasementPos