# Copyright (C) 2006-2007 G.P. Halkes
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


SWITCHES="+gettext"
OPTIONS="localedir diff"

COMPILERULE='$(CC) $(CFLAGS) $(GETTEXTFLAGS) -c -o $@ $<'
LINKRULE='$(CC) $(CFLAGS) $(LDFLAGS) -o .config .config.o $(LDLIBS) $(GETTEXTLIBS)'

USERRULES='.SUFFIXES: .mo .po
.po.mo:
	msgfmt -o $@ $<
'

TEST_INSTALL="install ./install.sh"

DEFAULT_LINGUAS="de nl"
[ -f config.pkg.langpack ] && . config.pkg.langpack

USER_HELP="  --without-gettext  Disable gettext translations
  --localedir=<dir>  Installation directory for locales [prefix/share/locale]
  --diff=<diff>      The diff program to use.

Environment variables:
  LINGUAS            List of languages to install. Available languages are:
    ${DEFAULT_LINGUAS}"


rundiff() {
	echo "Running ${DIFF} $@" >> config.log
	LANG="C" "${DIFF}" "$@" > .config.diff 2>&1
	RESULT=$?
	cat .config.diff >> config.log
	return "${RESULT}"
}

checkdiff() {
	echo "Checking output for '1c1'" >> config.log
	grep '^1c1$' config.log > /dev/null
}

config() {
	# Check the diff program for correct operation
	if [ -n "${option_diff}" ] ; then
		DIFF="${option_diff}"
		echo "${DIFF}" | grep "^\." > /dev/null && error "!! Do not use a relative path for the diff program"
	else
		DIFF=diff
	fi

	check_message "Checking for working diff program (${DIFF})... "
	clean .config.a .config.b .config.c 

	echo "text" > .config.a
	echo "text" > .config.b
	echo "TEXT" > .config.c

	clean .config.diff
	if not rundiff .config.a .config.b || rundiff .config.a .config.c || not checkdiff ; then
		check_message_result "no"
		exit 1
	fi
	check_message_result "yes"
	
	check_message "Checking for diff program has -a... "

	if not rundiff -a .config.a .config.b ; then
		check_message_result "no"
		DIFF_FLAGS="-DNO_MINUS_A"
	else
		check_message_result "yes"
	fi

	check_message "Checking for diff program has -i... "

	if not rundiff -i .config.a .config.c ; then
		check_message_result "no"
		DIFF_FLAGS="-DNO_MINUS_I ${DIFF_FLAGS}"
	else
		check_message_result "yes"
	fi

	clean .config.a .config.b .config.c .config.diff

	# Test for all required functionality

	cat > .config.c <<EOF
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char *argv[]) {
	FILE *file;
	int fd;
	char buffer[10];
	fd = mkstemp("fooXXXXXX");
	fdopen(fd, "r+");
	umask(~S_IRWXU);
	file = popen("echo", "r");
	pclose(file);
	snprintf(buffer, 10, "%s", "foo");
	return 0;
}
EOF
	clean .config.o
	
	test_link "required functions" || {
		check_message_result "Testing required functions seperatly for debugging purposes"
		cat > .config.c <<EOF
#include <stdlib.h>

int main(int argc, char *argv[]) {
	mkstemp("fooXXXXXX");
	return 0;
}
EOF
		test_link "mkstemp"

		cat > .config.c <<EOF
#include <stdio.h>

int main(int argc, char *argv[]) {
	fdopen(0, "r+");
	return 0;
}
EOF
		test_link "fdopen"
			
		cat > .config.c <<EOF
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char *argv[]) {
	umask(~S_IRWXU);
	return 0;
}
EOF
		test_link "umask"
		
		cat > .config.c <<EOF
#include <stdio.h>

int main(int argc, char *argv[]) {
	popen("echo", "r");
	return 0;
}
EOF
		test_link "popen"

		cat > .config.c <<EOF
#include <stdio.h>

int main(int argc, char *argv[]) {
	pclose((void *)0);
	return 0;
}
EOF
		test_link "pclose"

		cat > .config.c <<EOF
#include <stdio.h>

int main(int argc, char *argv[]) {
	char buffer[10];
	snprintf(buffer, 10, "%s", "foo");
	return 0;
}
EOF
		test_link "snprintf"

		exit 1
	}

	# Check for gettext functionality
	if [ "yes" = "${with_gettext}" ] ; then
		cat > .config.c <<EOF
#include "src/definitions.h"

int main(int argc, char *argv[]) {
	setlocale(LC_ALL, "");
	bindtextdomain("dwdiff", "/usr/share/locale");
	textdomain("dwdiff");
	gettext("dwdiff");
	return 0;
}
EOF
		{
			test_compile "gettext and related functions" GETTEXTFLAGS=-DUSE_GETTEXT && {
				test_link "gettext in standard library" GETTEXTFLAGS=-DUSE_GETTEXT ||
				{ test_link "gettext in -lintl" GETTEXTFLAGS=-DUSE_GETTEXT GETTEXTLIBS=-lintl && GETTEXTLIBS=-lintl ; } ||
				{ test_link "gettext in -lintl -liconv" GETTEXTFLAGS=-DUSE_GETTEXT "GETTEXTLIBS=-lintl -liconv" && GETTEXTLIBS="-lintl -liconv" ; }
			} && {
				clean .config.po .config.mo
				cat > .config.po <<EOF
msgid  "msg"
msgstr "translation"
EOF
				check_message "Checking for msgfmt... "
				if test_make .config.mo >> config.log 2>&1 ; then
					check_message_result "yes"
					true
				else
					check_message_result "no"
					false
				fi
			}
		} || {
			clean .config.po .config.mo
			check_message_result "!! Could not compile with gettext. Try configuring with --without-gettext."
			exit 1
		}
		clean .config.po .config.mo
		
		unset linguas
		if [ -n "${LINGUAS+set}" ] ; then
			check_message "Checking for available selected translations... "
			for lingua in ${LINGUAS}
			do
				if [ -f "po/${lingua}.po" ] && echo "${linguas}" | not grep "^\\(.* \\)*${lingua}\\( .*\\)*$" > /dev/null ; then
					linguas="${linguas}${linguas:+ }${lingua}"
				fi
			done
			check_message_result "done [${linguas}]"
		else
			linguas="${DEFAULT_LINGUAS}"
		fi
	fi


	if [ "yes" = "${with_gettext}" ] ; then
		create_makefile GETTEXTFLAGS=-DUSE_GETTEXT "GETTEXTLIBS=${GETTEXTLIBS}" "LINGUAS=${linguas}" "DIFF=${DIFF}" "DIFF_FLAGS=${DIFF_FLAGS}" ${option_localedir:+"LOCALEDIR=${option_localedir}"}
	else
		create_makefile GETTEXTFLAGS= GETTEXTLIBS= "DIFF=${DIFF}" "DIFF_FLAGS=${DIFF_FLAGS}" LINGUAS= LOCALEDIR=
	fi
}

sed_lines() {
	add_replace_settings "$@"
}