#!/bin/sh
#
# Why any "configure" fuss for this?
# Well, getting the proper directory and encoding for the
# japanese manpage is A Hard Task.
#
# This "configure" will create "Makefile".
#

OLANG="$LANG"
LANG=C; export LANG

while [ $# -gt 0 ]; do
	case "$1" in
	--prefix=*) prefix="${1##--prefix=}"; shift;;
	--prefix)   shift; prefix="$1"; shift;;
	--mandirja=*) mandirja="${1##--mandirja=}"; shift;;
	--mandirja) shift; mandirja="$1"; shift;;
	--mancodeja=*) mancodeja="${1##--mancodeja=}"; shift;;
	--mancodeja) shift; mancodeja="$1"; shift;;
	--libexecdir=*) libexecdir="${1##--libexecdir=}"; shift;;
	--libexecdir) shift; libexecdir="$1"; shift;;
	--bindir=*) bindir="${1##--bindir=}"; shift;;
	--bindir) shift; bindir="$1"; shift;;
	--etcdir=*) etcdir="${1##--etcdir=}"; shift;;
	--etcdir) shift; etcdir="$1"; shift;;
	*) echo "Unknown option: $1"; exit 1;;
	esac
done

: ${prefix:=/usr/local}
: ${bindir:=${prefix}/bin}
: ${libexecdir=${prefix}/libexec}
if [ -z "$etcdir" ]; then
	if [ "$prefix" = /usr ]; then
		# /usr/etc is not particulary useful
		etcdir=/etc
	else
		etcdir=${prefix}/etc
	fi
fi

test -d ${prefix}/share/man && : ${mandir:=${prefix}/share/man}
test -d ${prefix}/man && : ${mandir:=${prefix}/man}

test -r /usr/include/crypt.h && cppflags="${cppflags} -DHAVE_CRYPT_H=1"


cat <<EOF > ./Makefile
#
# Autogenerated from $0; DO NOT EDIT
#
prefix=${prefix}
BINDIR=${bindir}
MANDIR=${mandir}
ETCDIR=${etcdir}
LIBEXECDIR=${libexecdir}
CPPFLAGS=${cppflags}

LDLIBS=-lcrypt

all: passwdbattler battlerV2 passwdbattler.ja.6

battlerV2: battler.c
	\$(CC) -o \$@ \$(CPPFLAGS) \$(LDFLAGS) battler.c \$(LDLIBS)

clean::
	rm -f ./battlerV2 *.o
	rm -f ./.#*
	rm -f ./passwdbattler ./pwbrc

distclean:: clean
	rm -f ./Makefile

passwdbattler: ./passwdbattler.in
	sed -e 's:@LIBEXECDIR@:\$(LIBEXECDIR):g; s:@ETCDIR@:\$(ETCDIR):g' ./passwdbattler.in > \$@
	chmod 755 \$@

test: all
	./passwdbattler -HISTO

install: passwdbattler passwdbattler-genrc ./battlerV2 install-man install-man-ja install-pwbrc
	test -d \$(DESTDIR)\$(LIBEXECDIR) || mkdir -p \$(DESTDIR)\$(LIBEXECDIR)
	cp ./battlerV2 \$(DESTDIR)\$(LIBEXECDIR)/battlerV2
	touch -r ./battlerV2 \$(DESTDIR)\$(LIBEXECDIR)/battlerV2
	test -d \$(DESTDIR)\$(BINDIR) || mkdir -p \$(DESTDIR)\$(BINDIR)
	cp ./passwdbattler \$(DESTDIR)\$(BINDIR)/passwdbattler
	touch -r ./passwdbattler \$(DESTDIR)\$(BINDIR)/passwdbattler
	cp ./passwdbattler-genrc \$(DESTDIR)\$(BINDIR)/passwdbattler-genrc
	touch -r ./passwdbattler-genrc \$(DESTDIR)\$(BINDIR)/passwdbattler-genrc

install-man: ./passwdbattler.en.6
	test -d \$(DESTDIR)\$(MANDIR)/man6 || mkdir -p \$(DESTDIR)\$(MANDIR)/man6
	cp ./passwdbattler.en.6 \$(DESTDIR)\$(MANDIR)/man6/passwdbattler.6 
	touch -r ./passwdbattler.en.6 \$(DESTDIR)\$(MANDIR)/man6/passwdbattler.6 

install-pwbrc: #./pwbrc
	if [ -e ./pwbrc ]; then \
		test -d \$(DESTDIR)\$(ETCDIR) || mkdir \$(DESTDIR)\$(ETCDIR); \
		cp ./pwbrc \$(DESTDIR)\$(ETCDIR)/pwbrc; \
	fi

EOF

## Determine mandirja=/usr/local/share/man/ja_JP.eucJP
# Easiest: we have man/ja_JP.{encoding}/ directory
if test -z "$mandirja" && d=`ls -d ${mandir}/ja_JP.[uU][tT][fF]8 2>/dev/null`; then
	mandirja="$d"
fi
if test -z "$mandirja" && d=`ls -d ${mandir}/ja_JP.[uU][tT][fF]-8 2>/dev/null`; then
	mandirja="$d"
fi
if test -z "$mandirja" && d=`ls -d ${mandir}/ja_JP.[eE][uU][cC]JP 2>/dev/null`; then
	mandirja="$d"
fi
if test -z "$mandirja" && d=`ls -d ${mandir}/ja_JP.[eE][uU][cC] 2>/dev/null`; then
	mandirja="$d"
fi
# set $mancodeja for given mandirja=/usr/local/man/ja_JP.eucJP
case "$mandirja" in
*.[uU][tT][fF]8)	mancodeja="utf-8";;
*.[uU][tT][fF]-8)	mancodeja="utf-8";;
*.[eE][uU][cC]JP)	mancodeja="euc-jp";;
*.[eE][uU][cC])		mancodeja="euc-jp";;
esac

# We only have man/ja_JP or man/ja .
# What encoding it is depends on OS and version,
# so determine it later.
if test -z "$mandirja" && d=`ls -d ${mandir}/ja_JP 2>/dev/null`; then
	mandirja="$d"
fi
if test -z "$mandirja" && d=`ls -d ${mandir}/ja 2>/dev/null`; then
	mandirja="$d"
fi

## If we still cannot find man/ja, give up.
:

## If $mancodeja is still unavailable, and
# this was invoked with .utf-8 locale, assume that.
if [ -z "$mancodeja" ]; then
	case "$OLANG" in
	*.[uU][tT][fF]-8)	mancodeja="utf-8";;
	*.[uU][tT][fF]8)	mancodeja="utf-8";;
	*.[eE][uU][cC]JP)	mancodeja="euc-jp";;
	*.[eE][uU][cC]) 	mancodeja="euc-jp";;
	japanese)
		# likely old SunOS
		mancodeja="euc-jp";;
	esac
fi

## Now comes the hard part. We only have man/ja_JP or man/ja .
## What encoding it is depends on OS and version.
if [ -z "$mancodeja" ]; then
	e3e3=`awk 'BEGIN{printf "\343..\343"}' /dev/null`
	## Try locating "something.1", and peek in it
	## We're not using $mandirja, as it could be an empty directory.
	set	${prefix}/share/man/ja*/man1*/*.1* \
		${prefix}/man/ja*/man1*/*.1* \
		/usr/share/man/ja*/man1*/*.1* \
		/usr/man/ja*/man1*/*.1*
	while [ $# -gt 0 ]; do
		test -r "$1" || continue
		case "$1" in
		*'*')	shift;;	#failed glob
		*.gz)
			if zcat "$1" | grep -q "$e3e3" 2>/dev/null >/dev/null; then
				mancodeja="utf-8"
			else
				# default
				mancodeja="euc-jp"
			fi
			break;;
		*)
			if grep -q "$e3e3" "$1" 2>/dev/null >/dev/null; then
				mancodeja="utf-8"
			else
				# default
				mancodeja="euc-jp"
			fi
			break;;
		esac
	done
	if [ -z "$mancodeja" ]; then
		echo "Cannot determine default man/ja charset. Stop." >&2
		exit 2
	fi
fi

## Now, determine a program to convert ISO-2022-JP to $mancodeja.
if nkf2 -w </dev/null >/dev/null 2>/dev/null; then
	## nkf2 is most robust
	CONVJ="nkf2 -j"
	case "$mancodeja" in
	euc-jp) CONV="nkf2 -e";;
	utf-8) CONV="nkf2 -w";;
	esac
elif piconv -f iso-2022-jp -t $mancodeja </dev/null >/dev/null 2>/dev/null; then
	## piconv (Perl iconv) is portable, given perl >= 5.8.0
	CONV="piconv -f iso-2022-jp -t $mancodeja"
	CONVJ="piconv -t iso-2022-jp -f $mancodeja"
elif iconv -f iso-2022-jp -t $mancodeja </dev/null >/dev/null 2>/dev/null; then
	## iconv is less reliable, but better than nothing
	CONV="iconv -f iso-2022-jp -t $mancodeja"
	CONVJ="iconv -t iso-2022-jp -f $mancodeja"
elif "$mancodeja" = "euc-jp" && jistoeuc </dev/null >/dev/null; then
	## Older SunOS may have this
	CONV="jistoeuc"
	CONVJ="euctojis"
fi
if [ -z "$CONV" ]; then
	echo "Cannot determine converter to charcode ${mancodeja}. Stop." >&2
	exit 3
fi

if [ -z "$mandirja" ]; then
	echo "Warning: cannot determine japanese man directory. Emitting null install-man-ja." >&2
	cat <<EOF >>./Makefile
install-man-ja:
	:

EOF

else
	cat <<EOF >>./Makefile
MANDIRJA=$mandirja
install-man-ja: passwdbattler.ja.6
	test -d \$(DESTDIR)\$(MANDIRJA)/man6 || mkdir -p \$(DESTDIR)\$(MANDIRJA)/man6
	$CONV < ./passwdbattler.ja.6 > \$(DESTDIR)\$(MANDIRJA)/man6/passwdbattler.6
	chmod 644 \${DESTDIR}\$(MANDIRJA)/man6/passwdbattler.6
	touch -r ./passwdbattler.ja.6 \$(DESTDIR)\$(MANDIRJA)/man6/passwdbattler.6

passwdbattler.ja.6: passwdbattler.ja.html
	$CONV < ./passwdbattler.ja.html | sed -f html2roff | $CONVJ > \$@

EOF

	if [ "$mancodeja" = utf-8 ]; then
		# Easiest; we may have UTF-8 capable groff.
		JGROFF="groff -K utf8 -Tutf8 -man"
	else
		# Harder to detect.
		# jgroff -Tnippon || groff -Tnippon : groff with japanese patch
		# Fallback to nroff -man, which may not work
		if jgroff -Tnippon -man </dev/null; then
			JGROFF="jgroff -Tnippon -man"
		elif groff -Tnippon -man </dev/null; then
			JGROFF="groff -Tnippon -man"
		else
			JGROFF="nroff -man"
		fi
	fi
	cat <<EOF >>./Makefile
man-test: ./passwdbattler.ja.6
	$CONV < ./passwdbattler.ja.6 | $JGROFF

EOF
fi

echo "./Makefile generated." >&2