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#!/bin/sh
set -eu

while getopts 'iuHo:p:' flag; do
	case "$flag" in
		i)
			ACTION=install
			;;
		u)
			ACTION=uninstall
			;;
		H)
			ACTION=html
			;;
		o)
			OUTDIR="$OPTARG"
			;;
		p)
			MANPREFIX="$OPTARG"
			;;
		*)
			exit 2
			;;
	esac
done
shift $((OPTIND - 1))

assert_arg() {
	if [ -z "$1" ]; then
		echo "Missing $2" >&2
		exit 2
	fi
}

assert_arg "${ACTION:-}" '-[iuH] for choosing action'

for f in "$@"; do
	l="$(echo "$f" | awk -F. '{print $(NF-1)}')"
	n="$(echo "$f" | awk -F. '{print $NF}')"
	case "$ACTION" in
		html)
			assert_arg "${OUTDIR:-}" '-o OUTDIR'
			to_name="$(basename "${f%.$l.$n}.$n.html")"
			mkdir -p "$OUTDIR/$l"
			pandoc -s -r man -w html --metadata "lang=$l" < "$f" > "$OUTDIR/$l/$to_name"
			;;
		install)
			assert_arg "${MANPREFIX:-}" '-p MANPREFIX'
			to_name="$(basename "${f%.$l.$n}.$n")"
			mkdir -p "$MANPREFIX/$l/man$n" "$MANPREFIX/man$n"
			cp "$f" "$MANPREFIX/$l/man$n/$to_name"
			ln -fs "../en/man$n/$to_name" "$MANPREFIX/man$n/$to_name"
			;;
		uninstall)
			assert_arg "${MANPREFIX:-}" '-p MANPREFIX'
			to_name="$(basename "${f%.$l.$n}.$n")"
			rm -f \
				"$MANPREFIX/$l/man$n/$to_name" \
				"$MANPREFIX/man$n/$to_name"
			;;
		*)
			echo "Bad ACTION: $ACTION"
			exit 1
			;;
	esac
done