#!/usr/bin/env sh

### Script: gotoline
##
## 行を移動を行う。
##
## Metadata:
##
##   id - b921274f-69cc-4f17-9618-7e443814066e
##   author - <qq542vev at https://purl.org/meta/me/>
##   version - 2.0.1
##   date - 2022-10-12
##   since - 2019-07-29
##   copyright - Copyright (C) 2019-2022 qq542vev. Some rights reserved.
##   license - <CC-BY at https://creativecommons.org/licenses/by/4.0/>
##   package - w3mplus
##
## See Also:
##
##   * <Project homepage at https://github.com/qq542vev/w3mplus>
##   * <Bug report at https://github.com/qq542vev/w3mplus/issues>
##
## Help Output:
##
## ------ Text ------
## Usage:
##   gotoline [OPTION]... [FILE]...
##
## Options:
##   -l,     --line LINE_NUMBER  行番号を指定する
##   -n,     --number UNSIGNED_INTEGER | OPERATOR_AND_UNSIGNED_NUMBER | [SIGN]PERCENT% 
##                               指定した行数移動する
##   -h,     --help              このヘルプを表示して終了する
##   -v,     --version           バージョン情報を表示して終了する
##
## Exit Status:
##     0 - successful termination
##    64 - command line usage error
##    65 - data format error
##    66 - cannot open input
##    67 - addressee unknown
##    68 - host name unknown
##    69 - service unavailable
##    70 - internal software error
##    71 - system error (e.g., can't fork)
##    72 - critical OS file missing
##    73 - can't create (user) output file
##    74 - input/output error
##    75 - temp failure; user is invited to retry
##    76 - remote error in protocol
##    77 - permission denied
##    78 - configuration error
##   129 - received SIGHUP
##   130 - received SIGINT
##   131 - received SIGQUIT
##   143 - received SIGTERM
## ------------------

readonly 'VERSION=gotoline 2.0.1'

. 'initialize.sh'
. 'option_error.sh'
. 'regex_match.sh'

# @getoptions
parser_definition() {
	setup REST abbr:true error:option_error plus:true no:0 help:usage \
		-- 'Usage:' "  ${2##*/} [OPTION]... [FILE]..." \
		'' 'Options:'

	param line    -l --line    init:='1' validate:'regex_match "${OPTARG}" "^[1-9][0-9]*$"' var:LINE_NUMBER -- '行番号を指定する'
	param number  -n --number  init:='1' validate:'regex_match "${OPTARG}" "^([1-9][0-9]*|[+*/%^-][1-9][0-9]*(\\\\.[0-9]+)?|[+-]?(0|[1-9][0-9]?)(\\\\.[0-9]+)?%|[+-]?100(\\\\.0+)?%)$"' var:'UNSIGNED_INTEGER | OPERATOR_AND_UNSIGNED_NUMBER | [SIGN]PERCENT%' -- '指定した行数移動する'
	disp  :usage  -h --help    -- 'このヘルプを表示して終了する'
	disp  VERSION -v --version -- 'バージョン情報を表示して終了する'

	msg -- '' 'Exit Status:' \
		'    0 - successful termination' \
		'   64 - command line usage error' \
		'   65 - data format error' \
		'   66 - cannot open input' \
		'   67 - addressee unknown' \
		'   68 - host name unknown' \
		'   69 - service unavailable' \
		'   70 - internal software error' \
		"   71 - system error (e.g., can't fork)" \
		'   72 - critical OS file missing' \
		"   73 - can't create (user) output file" \
		'   74 - input/output error' \
		'   75 - temp failure; user is invited to retry' \
		'   76 - remote error in protocol' \
		'   77 - permission denied' \
		'   78 - configuration error' \
		'  129 - received SIGHUP' \
		'  130 - received SIGINT' \
		'  131 - received SIGQUIT' \
		'  143 - received SIGTERM'
}
# @end

# @gengetoptions parser -i parser_definition parse "${1}"
# @end

eval "$(getoptions parser_definition parse "${0}")"
parse ${@+"${@}"}
eval "set -- ${REST}"

lineCount=$(grep -c -e '^' --  ${@+"${@}"})

case "${number}" in
	*%)
		number="${number%?}"

		case "${number}" in
			[+-]*) number=$(awk -- "BEGIN { print ${line} + int(((${lineCount} - 1) * (${number} / 100)) + 1) }");;
			*) number=$(awk -- "BEGIN { print int(((${lineCount} - 1) * (${number} / 100)) + 1) }");;
		esac
		;;
	[+*/%^-]*) number=$(awk -- "BEGIN { print int(${line} ${number}) }");;
esac

if [ "${number}" -lt 1 ]; then
	number='1'
fi

if [ "${lineCount}" -lt "${number}" ]; then
	number="${lineCount}"
fi

printf '%d\n' "${number}"
