setup_worst_case.sh

#!/bin/bash

if [ -z $1 ] || [ -z $2 ]; then
	echo "USAGE: ./time_worst_case string_type length_range"
	echo "This script requires two inputs:"
	echo "1) what type of worst case string to test on, 'z' for all different chars or 'A' for all the same"
	echo "2) what range of string lengths to generate, select from 0, 1, 2, or 3"
	exit
fi

return_dir=`pwd`
cd "${0%/*}"

path="../test_files/worst_case/"
name="worst_case_$1"
extension=".txt"
prefix=$path$name

if [ ! -d "$path" ]; then
  mkdir -p "$path"
fi

test_str_z="zyxwvutsrqponmlkjihgfedcba9876543210ZYXWVUTSRQPONMLKJIHGFEDCBA"		#62 chars long
test_str_A="AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
padding_str=".............................................................."	#also 62 chars

temp_name="temp"
temp_file=$path$temp_name$extension

WC_STR_LEN=()

case $1 in
	z)
 		selected_str=$test_str_z
 		;;
 	A)
 		selected_str=$test_str_A
 		;;
 	*)
 		echo "Use the char 'z' to specify all different character strings, and 'A' to specify all same character strings"
 		;;
 esac

case $2 in
	0)
		for ((i=0;i<=11;++i)); do 
			WC_STR_LEN+=($i)
		done
		;;
	1)
		for ((i=12;i<=23;++i)); do 
			WC_STR_LEN+=($i)
		done
		;;
	2)
		for ((i=24;i<=35;++i)); do 
			WC_STR_LEN+=($i)
		done
		;;
	3)
		for ((i=36;i<=58;i+=2)); do 
			WC_STR_LEN+=($i)
		done
		WC_STR_LEN+=(61)
		;;
	*)
		echo "Use an integer input (0, 1, 2, or 3) to select which set of worst case test files to generate"
		;;
esac

for len in ${WC_STR_LEN[@]}; do
	pad_len=$(((62-len)/2))
	current_file=$prefix$len$extension
	if [ $((len%2)) -eq 0 ]; then
		current_str=${padding_str:0:$pad_len}${selected_str:0:$len}${padding_str:0:$pad_len}
	else 
		current_str=${padding_str:0:$pad_len}${selected_str:0:$len}${padding_str:0:$((pad_len+1))} 
	fi

	echo $current_str > $current_file
	for ((j=0;j<=22;j++)); do
		cat $current_file > $temp_file
		cat $temp_file >> $current_file
	done
done
rm $temp_file

cd $return_dir