#!/bin/bash
#
# Author: Georg Voell - georg.voell@standby.cloud
# Version: @(#)convert-number 3.2.1 13.10.2024 (c)2024 Standby.cloud
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
#
# This script can be used free of charge. Use it as is or customize as needed. It is not guaranteed to be
# error free and you will not be reimbursed for any damage it may cause.
#
#@  Convert Number String e.g. 2,3,5-7,9 into a sequential number string e.g. 002 003 005 006 007 009
#@
#@Usage: convert-number numberstr
#@  Options:
#@    -h, --help            : Displays helptext.
#@    -v, --version         : Displays the version of the script.
#@    -p, --padding <number>: Numbers are sorted and left padded with 0 (default padding is 3).
#@    -x, --max <number>    : Maximal <number> - useful if one calls script with e.g. "5-".
#@  NumberStr: Can be a numer or a string e.g. "2,3,5-7,9"
#@
#@Examples:
#@  convert-number --max 8 2,5-
#@    Displays "002 005 006 007 008"
#
# Exit codes:
#  01: Unknown or wrong parameter.
#  02: Invalid number
#  03: Minimum is 1.
#  04: Number is greater than max number.
#  99: User interrupt.
#
# See also:
#  **install-scripts**(1)
#
# Update history:
#
# V 2.0.0 05.07.2019 New version
# V 3.0.0 02.05.2020 Minor changes
# V 3.0.1 11.06.2020 Using library
# V 3.1.0 05.06.2023 New copyright
# V 3.1.1 28.07.2024 Trapping ctrl-c
# V 3.2.0 12.08.2024 New minor version
# V 3.2.1 13.10.2024 Converted from tcsh to bash
#

# Find executable bash library and source it
lib=`which lib.bash 2>/dev/null | sed 's|^no 'lib.bash' in .*||'`
if [ "$lib" != "" ]; then
	source "$lib"
else
	progdir=`dirname "$0"`
	if [ -r "${progdir}/lib.bash" ]; then
		source "${progdir}/lib.bash"
	else
		echo "Unexpected error: Unable to locate bash library 'lib.bash'."
		exit 1
	fi
fi

# Preset
numberstr=""
maxnumber=""
padding="3"

# Check parameters: Loop until all parameters are used up
while [ $# -gt 0 ]; do
	pname=${1}
	case "$pname" in
		-v | --version)
			shift
			showversion=true
			;;
		-h | --help)
			shift
			showhelp=true
			;;
		-p | --padding)
			shift
			if [ "$1" != "" ]; then
				padding=${1}
				result=`echo "$padding" | grep '^[0123456789]*$'`
				if [ "$result" = "" ]; then
					errstr="Not a number: '$padding'."
				fi
				shift
			else
				errstr="Please specify a number after parameter '$pname'."
			fi
			;;
		-x | --max)
			shift
			if [ "$1" != "" ]; then
				maxnumber=${1}
				result=`echo "$maxnumber" | grep '^[0123456789]*$'`
				if [ "$result" = "" ]; then
					errstr="Not a number: '$maxnumber'."
				fi
				shift
			else
				errstr="Please specify a number after parameter '$pname'."
			fi
			;;
		*)
			shift
			paramck=`echo "$pname" | grep '^-'` # Keys don't begin with '-'
			if [ "$paramck" != "" ]; then
				errstr="Unknown option '$pname'."
			else
				if [ "$errstr" = "" ]; then
					if [ "$numberstr" = "" ]; then
						numberstr=`echo "$pname" | tr -d ' '`
					else
						errstr="Number string was already specified '$numberstr'. Unknown additional parameter: '$pname'."
					fi
				fi
			fi
	esac
done

# Plausibility checks
if [ "$errstr" = "" -a "$numberstr" = "" ]; then
	errstr="Please give a number string like '2,3,5-7,9'."
fi

# Display help or error message
DisplayHelp

### Main

# Create empty scratchfile
printf "" > $scratchfile

# Create string with blank sparated numbers
numbers=`echo "$numberstr" | sed 's|,| |g'`

# Iterate over each number
for num in $numbers; do
	range=`echo "$num" | grep '^[0123456789]*-[0123456789]*$'`
	if [ "$range" != "" ]; then
		rstr1=`echo "$range" | cut -d'-' -f1`
		rstr2=`echo "$range" | cut -d'-' -f2`
		if [ "$rstr2" != "" ]; then
			if [ "$rstr1" = "" ]; then
				rstr1=1
			fi
			
			seq -f "%0${padding}g" $rstr1 1 $rstr2 >> $scratchfile
		else
			if [ "$rstr1" != "" -a "$maxnumber" != "" ]; then
				seq -f "%0${padding}g" $rstr1 1 $maxnumber >> $scratchfile
			else
				exitcode=2
				errormsg $exitcode "($progstr) String '$num' is not a valid number or expression."
				Cleanup
				exit $exitcode
			fi
		fi
	else
		numstr=`echo "$num" | grep '^[0123456789]*$'`
		if [ "$numstr" != "" ]; then
			printf "%0${padding}g\n" "$numstr" >> $scratchfile
		else
			exitcode=2
			errormsg $exitcode "($progstr) String '$num' is not a valid number or expression."
			Cleanup
			exit $exitcode
		fi
	fi
done

filemin=`cat $scratchfile | sort -u | head -n 1`
if [ $filemin -lt 1 ]; then
	exitcode=3
	errormsg $exitcode "($progstr) Selection is less then min '1'."
fi

if [ $exitcode -eq 0 ]; then
	if [ "$maxnumber" != "" ]; then
		filemax=`cat $scratchfile | sort -u | taillastline`
		if [ $filemax -gt $maxnumber ]; then
			exitcode=4
			errormsg $exitcode "($progstr) Selection is greater then max '$maxnumber'."
		fi
	fi

	# Display result
	if [ $exitcode -eq 0 ]; then
		cat $scratchfile | sort -u
	fi
fi

# Cleanup and exit
Cleanup
exit $exitcode