#!/usr/bin/env sh


readonly 'VERSION=changeconfig 3.0.3'



set -efu
umask '0022'
readonly "LC_ALL_ORG=${LC_ALL-}"
LC_ALL='C'
IFS=$(printf ' \t\n_')
IFS="${IFS%_}"
PATH="${PATH-}${PATH:+:}$(command -p getconf 'PATH')"
UNIX_STD='2003'         # HP-UX POSIX mode
XPG_SUS_ENV='ON'        # AIX POSIX mode
XPG_UNIX98='OFF'        # AIX UNIX 03 mode
POSIXLY_CORRECT='1'     # GNU Coreutils POSIX mode
COMMAND_MODE='unix2003' # macOS UNIX 03 mode
export 'LC_ALL' 'IFS' 'PATH' 'UNIX_STD' 'XPG_SUS_ENV' 'XPG_UNIX98' 'POSIXLY_CORRECT' 'COMMAND_MODE'




readonly 'EX_OK=0' # successful termination

readonly 'EX__BASE=64' # base value for error messages

readonly 'EX_USAGE=64'       # command line usage error
readonly 'EX_DATAERR=65'     # data format error
readonly 'EX_NOINPUT=66'     # cannot open input
readonly 'EX_NOUSER=67'      # addressee unknown
readonly 'EX_NOHOST=68'      # host name unknown
readonly 'EX_UNAVAILABLE=69' # service unavailable
readonly 'EX_SOFTWARE=70'    # internal software error
readonly 'EX_OSERR=71'       # system error (e.g., can't fork)
readonly 'EX_OSFILE=72'      # critical OS file missing
readonly 'EX_CANTCREAT=73'   # can't create (user) output file
readonly 'EX_IOERR=74'       # input/output error
readonly 'EX_TEMPFAIL=75'    # temp failure; user is invited to retry
readonly 'EX_PROTOCOL=76'    # remote error in protocol
readonly 'EX_NOPERM=77'      # permission denied
readonly 'EX_CONFIG=78'      # configuration error

readonly 'EX__MAX=78' # maximum listed value

trap 'case "${?}" in 0) end_call;; *) end_call "${EX_SOFTWARE}";; esac' 0 # EXIT
trap 'end_call 129' 1                                                     # SIGHUP
trap 'end_call 130' 2                                                     # SIGINT
trap 'end_call 131' 3                                                     # SIGQUIT
trap 'end_call 143' 15                                                    # SIGTERM

alias org_lc='LC_ALL="${LC_ALL_ORG}"'


end_call() {
	trap '' 0 # EXIT
	rm -fr -- ${tmpDir:+"${tmpDir}"}
	exit "${1:-0}"
}



option_error() {
	printf '%s: %s\n' "${0##*/}" "${1}" >&2
	printf "詳細については '%s' を実行してください。\\n" "${0##*/} --help" >&2

	end_call "${EX_USAGE}"
}



regex_match() {
	awk -- '
		BEGIN {
			for(i = 2; i < ARGC; i++) {
				if(ARGV[1] !~ ARGV[i]) {
					exit 1
				}
			}

			exit
		}
	' ${@+"${@}"} || return 1

	return 0
}



awkv_escape() {
	set -- "${1}" "${2}" ''
	until [ "${2#*\\}" '=' "${2}" ]; do
		set -- "${1}" "${2#*\\}" "${3}${2%%\\*}\\\\"
	done

	set -- "${1}" "${3}${2}"
	case "${2}" in
	@*) set -- "${1}" "\\100${2#?}" ;;
	esac

	eval "${1}=\${2}"
}



append_array_posix() {
	while [ 2 -le "${#}" ]; do
		__append_array_posix "${1}" "${2}"

		eval "shift 2; set -- '${1}'" '${@+"${@}"}'
	done
}


__append_array_posix() {
	set "${1}" "${2-}" ''

	until [ "${2#*\'}" '=' "${2}" ]; do
		set -- "${1}" "${2#*\'}" "${3}${2%%\'*}'\"'\"'"
	done

	eval "${1}=\"\${${1}-}\${${1}:+ }'\${3}\${2}'\""
}

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

	flag placeFlag -i --{no-}in-place init:@no -- 'FILE を更新して保存する'
	param max --max validate:'regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\\.[0-9]+)?$"' var:NUMBER -- '計算結果の最大値を指定する'
	param min --min validate:'regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\\.[0-9]+)?$"' var:NUMBER -- '計算結果の最小値を指定する'
	param :'append_array_posix param "${OPTARG}"' -p --param validate:'regex_match "${OPTARG}" "^[0-9A-Za-z_-]+="' var:'NAME=VALUE | NAME=OPERATOR=UNSIGNED_NUMBER | NAME=!' -- 'NAME の値を更新する'
	flag param --no-param init:@no on: no: -- '-p, --param をリセットする'
	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'
}

placeFlag='0'
max=''
min=''
param=''
REST=''
parse() {
	OPTIND=$(($# + 1))
	while OPTARG= && [ $# -gt 0 ]; do
		set -- "${1%%\=*}" "${1#*\=}" "$@"
		while [ ${#1} -gt 2 ]; do
			case $1 in *[!a-zA-Z0-9_-]*) break ;; esac
			case '--in-place' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --in-place" ;;
			esac
			case '--no-in-place' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --no-in-place" ;;
			esac
			case '--max' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --max" ;;
			esac
			case '--min' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --min" ;;
			esac
			case '--param' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --param" ;;
			esac
			case '--no-param' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --no-param" ;;
			esac
			case '--help' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --help" ;;
			esac
			case '--version' in
			"$1")
				OPTARG=
				break
				;;
			$1*) OPTARG="$OPTARG --version" ;;
			esac
			break
		done
		case ${OPTARG# } in
		*\ *)
			eval "set -- $OPTARG $1 $OPTARG"
			OPTIND=$((($# + 1) / 2)) OPTARG=$1
			shift
			while [ $# -gt "$OPTIND" ]; do
				OPTARG="$OPTARG, $1"
				shift
			done
			set "Ambiguous option: $1 (could be $OPTARG)" ambiguous "$@"
			option_error "$@" >&2 || exit $?
			echo "$1" >&2
			exit 1
			;;
		?*)
			[ "$2" = "$3" ] || OPTARG="$OPTARG=$2"
			shift 3
			eval 'set -- "${OPTARG# }"' ${1+'"$@"'}
			OPTARG=
			;;
		*) shift 2 ;;
		esac
		case $1 in
		--?*=*)
			OPTARG=$1
			shift
			eval 'set -- "${OPTARG%%\=*}" "${OPTARG#*\=}"' ${1+'"$@"'}
			;;
		--no-* | --without-*) unset OPTARG ;;
		-[p]?*)
			OPTARG=$1
			shift
			eval 'set -- "${OPTARG%"${OPTARG#??}"}" "${OPTARG#??}"' ${1+'"$@"'}
			;;
		-[ihv]?*)
			OPTARG=$1
			shift
			eval 'set -- "${OPTARG%"${OPTARG#??}"}" -"${OPTARG#??}"' ${1+'"$@"'}
			OPTARG=
			;;
		+*) unset OPTARG ;;
		esac
		case $1 in
		'-i' | '--in-place' | '--no-in-place')
			[ "${OPTARG:-}" ] && OPTARG=${OPTARG#*\=} && set "noarg" "$1" && break
			eval '[ ${OPTARG+x} ] &&:' && OPTARG='1' || OPTARG='0'
			placeFlag="$OPTARG"
			;;
		'--max')
			[ $# -le 1 ] && set "required" "$1" && break
			OPTARG=$2
			regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$" || {
				set -- regex_match:$? "$1" regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$"
				break
			}
			max="$OPTARG"
			shift
			;;
		'--min')
			[ $# -le 1 ] && set "required" "$1" && break
			OPTARG=$2
			regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$" || {
				set -- regex_match:$? "$1" regex_match "${OPTARG}" "^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$"
				break
			}
			min="$OPTARG"
			shift
			;;
		'-p' | '--param')
			[ $# -le 1 ] && set "required" "$1" && break
			OPTARG=$2
			regex_match "${OPTARG}" "^[0-9A-Za-z_-]+=" || {
				set -- regex_match:$? "$1" regex_match "${OPTARG}" "^[0-9A-Za-z_-]+="
				break
			}
			append_array_posix param "${OPTARG}"
			shift
			;;
		'--no-param')
			[ "${OPTARG:-}" ] && OPTARG=${OPTARG#*\=} && set "noarg" "$1" && break
			eval '[ ${OPTARG+x} ] &&:' && OPTARG='' || OPTARG=''
			param="$OPTARG"
			;;
		'-h' | '--help')
			usage
			exit 0
			;;
		'-v' | '--version')
			echo "${VERSION}"
			exit 0
			;;
		--)
			shift
			while [ $# -gt 0 ]; do
				REST="${REST} \"\${$((OPTIND - $#))}\""
				shift
			done
			break
			;;
		[-+]?*)
			set "unknown" "$1"
			break
			;;
		*)
			REST="${REST} \"\${$((OPTIND - $#))}\""
			;;
		esac
		shift
	done
	[ $# -eq 0 ] && {
		OPTIND=1
		unset OPTARG
		return 0
	}
	case $1 in
	unknown) set "Unrecognized option: $2" "$@" ;;
	noarg) set "Does not allow an argument: $2" "$@" ;;
	required) set "Requires an argument: $2" "$@" ;;
	pattern:*) set "Does not match the pattern (${1#*:}): $2" "$@" ;;
	notcmd) set "Not a command: $2" "$@" ;;
	*) set "Validation error ($1): $2" "$@" ;;
	esac
	option_error "$@" >&2 || exit $?
	echo "$1" >&2
	exit 1
}
usage() {
	cat <<'GETOPTIONSHERE'
Usage:
  changeconfig [OPTION]... [FILE]...

Options:
  -i,     --{no-}in-place     FILE を更新して保存する
          --max NUMBER        計算結果の最大値を指定する
          --min NUMBER        計算結果の最小値を指定する
  -p,     --param NAME=VALUE | NAME=OPERATOR=UNSIGNED_NUMBER | NAME=! 
                              NAME の値を更新する
          --no-param          -p, --param をリセットする
  -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
GETOPTIONSHERE
}

parse ${@+"${@}"}
eval "set -- ${REST}"

tmpDir=$(mktemp -d)
tmpConfig="${tmpDir}/config"
awkScript=$(
	cat <<-'__EOF__'
		BEGIN {
			split("", not)
			split("", param)

			not["0"] = 1; not["1"] = 0;
			not["TRUE"] = "FALSE"; not["True"] = "False"; not["true"] = "false";
			not["FALSE"] = "TRUE"; not["False"] = "True"; not["false"] = "true";
			not["YES"] = "NO"; not["Yes"] = "No"; not["yes"] = "no";
			not["NO"] = "YES"; not["No"] = "Yes"; not["no"] = "yes";

			for(i = 1; i < ARGC; i++) {
				if(ARGV[i] == "--") {
						delete ARGV[i]
						break
				}

				position = index(ARGV[i], "=")
				param[substr(ARGV[i], 1, position - 1)] = substr(ARGV[i], position + 1)

				delete ARGV[i]
			}
		}

		{
			if(match($0, /^[ \t]*[0-9A-Za-z-][_.0-9A-Za-z-]+[ \t]+/)) {
				name = substr($0, RSTERT, RLENGTH)
				gsub(/[ \t]/, "", name)

				value = substr($0, RLENGTH + 1)
				gsub(/[ \t]$/, "", value)

				if(name in param) {
					if((param[name] ~ /^[+*/%^-]=[1-9][0-9]*(\.[0-9]+)?$/) && (value ~ /^[+-]?(0|[1-9][0-9]*)(\.[0-9]+)?$/)) {
						operator = substr(param[name], 1, 1)
						decimalFlag = index(value, ".")

						if(operator == "+") {
							value += substr(param[name], 3)
						} else if(operator == "-") {
							value -= substr(param[name], 3)
						} else if(operator == "*") {
							value *= substr(param[name], 3)
						} else if(operator == "/") {
							value /= substr(param[name], 3)
						} else if(operator == "%") {
							value %= substr(param[name], 3)
						} else if(operator == "^") {
							value ^= substr(param[name], 3)
						}

						if(max != "" && max < value) {
							value = max
						} else if(min != "" && value < min) {
							value = min
						} else if(!decimalFlag) {
							value = int(value)
						} else if(value == int(value)) {
							value = value ".0"
						}
					} else if((param[name] == "!") && (value in not)) {
						value = not[value]
					} else {
						value = param[name]
					}
				}

				printf("%s %s\n", name, value)
			} else {
				printf("%s\n", $0)
			}
		}
	__EOF__
)

command='awk -v "max=${max}" -v "min=${min}" -- "${awkScript}" '"${param} --"

case "${placeFlag}" in
'0') eval "${command}" '${@+"${@}"}' ;;
*)
	for config in ${@+"${@}"}; do
		case "${config}" in '-')
			printf "%s: '-i', '--in-place' オプションでは標準入力は使用できません。無視します。\\n" "${0##*/}" >&2
			continue
			;;
		esac

		eval "${command}" '"${config}"' >"${tmpConfig}"
		cat -- "${tmpConfig}" >"${config}"
	done
	;;
esac
