#!/usr/bin/env bash
#
# Configure script for pqiv. Running this script is optional if you only want
# gdk-pixbuf support, but still recommended.
#

tempdir() {
	NAME=tmp_${RANDOM}
	while ! mkdir "${NAME}" 2>/dev/null; do
		NAME=tmp_${RANDOM}
	done
	echo ${NAME}
}

PREFIX=/usr
DESTDIR=
GTK_VERSION=0
CROSS=
BINARY_EXTENSION=
BINDIR=
LIBDIR=
MANDIR=
BACKENDS=
ENFORCED_BACKENDS=
DISABLED_BACKENDS=
EXTRA_DEFS=
BACKENDS_BUILD=static
DEBUG_DEFS=

# Check if configure was called from another directory;
# support for out-of-source-tree builds
STARTUP_DIR="$(pwd)"
SOURCE_DIR="$( (cd "$(dirname "$0")"; pwd -P) )"
cd "$SOURCE_DIR"

# For development, you can set default settings here
[ -x ./configure-dev ] && . ./configure-dev

# Help and options
help() {
	cat >&2 <<EOF
pqiv configuration

general options:
  --prefix=..           Set the prefix for installed files [/usr]
  --destdir=..          Set the destination prefix for "make install" [/]
  --libdir=..           Set the directory for shared libraries [\$PREFIX/lib]
  --gtk-version=2       Use GTK+-2.0 even if GTK+-3.0 is available
  --cross=..            Set a cross-compiler prefix (e.g. \`i686-pc-mingw32-')

  Some of the usual autotools options are supported as well for advanced users.
  See the source code of the configure script.

options to select pqiv's backends:
  --backends=..         Select which backends to include in pqiv
                        (autodetermined by default)
                        Available:
                          archive (generic archive file support),
                          archive_cbx (*.cb? comic book archive support),
                          libav (Video support, works with ffmpeg as well),
                          gdkpixbuf (images),
                          poppler (PDF),
                          spectre (PS/EPS),
                          wand (ImageMagick, various formats)
                          webp (WebP format)
  --with[out]-<backend> Alternative syntax for backend selection. Non-specified backends are
                        autodetermined.
  --backends-build=..   Either \`shared' to compile the backends as shared libraries,
                        or \`static' to compile them into pqiv. \`shared' is only of use if you
                        plan to package pqiv and want to get rid of the run-time dependencies,
                        so this defaults to \`static'.

options to remove features from pqiv:
EOF

	awk 'BEGIN { FS="ifndef|ifdef|option|:|/\\*|\\*/" } /ifn?def .+ option / { print $2 " " $4 " " $5 }' pqiv.c | while read DEFNAME OPTFLAG DESCRIPTION; do
		if [ ${#DESCRIPTION} -gt 50 ]; then
			printf "  %-22s\n  %-22s%s\n" $OPTFLAG "" "$DESCRIPTION" >&2
		else
			printf "  %-22s%s\n" $OPTFLAG "$DESCRIPTION" >&2
		fi
	done
	echo >&2
}

while [ $# -gt 0 ]; do
	PARAMETER=${1%=*}
	VALUE=${1#*=}

	case $PARAMETER in
		--prefix)
			PREFIX=$VALUE
			;;
		--destdir)
			DESTDIR=$VALUE
			;;
		--libdir)
			LIBDIR=${VALUE}
			LIBDIR="${LIBDIR//\{/(}"
			LIBDIR="${LIBDIR//\}/)}"
			LIBDIR="${LIBDIR//prefix/PREFIX}"
			;;
		--gtk-version)
			GTK_VERSION=$VALUE
			;;
		-h)
			help
			exit 0
			;;
		--help)
			help
			exit 0
			;;
		--cross)
			CROSS=$VALUE
			if [ "${CROSS: -1}" != "-" ]; then
				CROSS="$CROSS-"
			fi
			;;
		--backends-build)
			BACKENDS_BUILD=$VALUE
			if [ "$BACKENDS_BUILD" != "static" -a "$BACKENDS_BUILD" != "shared" ]; then
				echo "Invalid argument to --backends-build: Value must be either \`static' or \`shared'." >&2
				exit 1
			fi
			;;
		--backends)
			BACKENDS="${VALUE//,/ }"
			for NAME in ${BACKENDS}; do
				[ -e backends/${NAME}.c ] && continue
				echo "Invalid argument to --backends: Backend ${NAME} was not found" >&2
				exit 1
			done
			;;
		# Undocumented options for autoconf (esp. dh_auto_configure)
		# compatibility Note to maintainers: These options are here to make it
		# simpler to package pqiv, because they allow to run autotools wrappers
		# against this package.  I will maintain them, but I'd recommend
		# against using them if you can avoid it.
		--host)
			CROSS=${VALUE}-
			;;
		--bindir)
			BINDIR=${VALUE}
			BINDIR="${BINDIR//\{/(}"
			BINDIR="${BINDIR//\}/)}"
			BINDIR="${BINDIR//prefix/PREFIX}"
			echo "Use of autoconf option --bindir is discouraged, because support is incomplete. Rewrote \`$VALUE' to \`$BINDIR' and used that as the BINDIR Make variable." >&2
			;;
		--mandir)
			MANDIR=${VALUE}
			MANDIR="${MANDIR//\{/(}"
			MANDIR="${MANDIR//\}/)}"
			MANDIR="${MANDIR//prefix/PREFIX}"
			echo "Use of autoconf option --mandir is discouraged, because support is incomplete. Rewrote \`$VALUE' to \`$MANDIR' and used that as the MANDIR Make variable." >&2
			;;
		--disable-silent-rules)
			VERBOSE=1
			;;
		--infodir | --sysconfdir | --includedir | --localstatedir | --libexecdir | --disable-maintainer-mode | --disable-dependency-tracking | --build | --sbindir | --includedir | --oldincludedir | --localedir | --docdir)
			echo "autoconf option ${PARAMETER} ignored" >&2
			;;
		--no-sorting | --no-compositing | --no-fading | --no-commands | --no-config-file | --no-inotify | --no-animations | --binary-name)
			echo "obsolete 1.0 option ${PARAMETER} ignored" >&2
			;;
		*)
			# Check for disableable feature flag
			DEF=$(
				awk 'BEGIN { FS="ifndef|ifdef|option|:|/\\*|\\*/" } /ifn?def .+ option / { print $2 " " $4 " " $5 }' pqiv.c | while read DEFNAME OPTFLAG DESCRIPTION; do
					if [ "${PARAMETER}" = "${OPTFLAG}" ]; then
						echo "-D${DEFNAME}"
					fi
				done
			)
			if [ -n "${DEF}" ]; then
				EXTRA_DEFS="${EXTRA_DEFS} ${DEF}"
			else
				# Check for dynamic backend en-/dis-abling flag
				if [ "${PARAMETER#--without-}" != "${PARAMETER}" ]; then
					NAME="${PARAMETER#--without-}"
					if ! [ -e backends/${NAME}.c ]; then
						echo "Unknown option: $1" >&2
						exit 1
					fi
					DISABLED_BACKENDS="${PARAMETER#--without-} ${DISABLED_BACKENDS}"
				elif [ "${PARAMETER#--with-}" != "${PARAMETER}" ]; then
					NAME="${PARAMETER#--with-}"
					if ! [ -e backends/${NAME}.c ]; then
						echo "Unknown option: $1" >&2
						exit 1
					fi
					ENFORCED_BACKENDS="${NAME} ${ENFORCED_BACKENDS}"
				else
					echo "Unknown option: $1" >&2
					help
					exit 1
				fi
			fi
	esac
	shift
done

# The makefile is for GNU make
if [ -z $MAKE ]; then
	MAKE=make
	if ! (${MAKE} -v 2>&1 | grep -q "GNU Make"); then
		MAKE=gmake
		if ! which $MAKE 2>&1 >/dev/null; then
			echo "GNU make is required for building pqiv" >&2
			exit 1
		fi
	fi
fi

# If cross-compiling, check if cc is present (usually it is not)
if [ -n "$CROSS" -a -z "$CC" ]; then
	echo -n "Checking for cross-compiler cc..              "
	if ! which ${CROSS}cc >/dev/null 2>&1; then
		if which ${CROSS}clang >/dev/null 2>&1; then
			export CC=clang
		elif which ${CROSS}gcc >/dev/null 2>&1; then
			export CC=gcc
		else
			echo
			echo
			echo "No compiler found. Please set the appropriate CC environment variable." >&2
			exit 1
		fi
		echo "using ${CROSS}${CC}"
	else
		echo "ok"
	fi
fi

# Determine binary extension (for Windows)
echo -n "Determining executable extension..            "
DIR=`tempdir`
cd $DIR
echo 'int main(int argc, char *argv[]) { return 0; }' > test.c
${CROSS}${CC:-cc} ${CFLAGS} test.c ${LDFLAGS}
RV=$?
rm -f test.c
EXECUTABLE=`ls`
rm -f $EXECUTABLE
cd ..
rmdir $DIR
if [ "$RV" != 0 ]; then
	echo
	echo
	echo "The compiler can't compile executables!?" >&2
	exit 1
fi
EXECUTABLE_EXTENSION=${EXECUTABLE#a}
if [ "$EXECUTABLE_EXTENSION" = ".out" ]; then
	EXECUTABLE_EXTENSION=
fi
echo ${EXECUTABLE_EXTENSION:-(none)}

# Do a rudimental prerequisites check to have user-friendlier error messages
if [ -n "${CROSS}" -a -z "${PKG_CONFIG}" ]; then
	echo -n "Checking for pkg-config..                     "
	PKG_CONFIG=${CROSS}pkg-config
	if ! which ${PKG_CONFIG} >/dev/null 2>&1; then
		echo
		echo
		echo "Did not find a specialized tool ${CROSS}pkg-config, defaulting to pkg-config" >&2
		echo "If you really ARE cross-compiling, the build might therefore fail!" >&2
		echo
		PKG_CONFIG=pkg-config
	else
		echo "${PKG_CONFIG}"
	fi
fi

# Auto-determine available backends
if [ -z "$BACKENDS" ]; then
	echo -n "Checking for supported backends..             "
	BACKENDS="$($MAKE get_available_backends ${PKG_CONFIG:+PKG_CONFIG="$PKG_CONFIG"} | awk '/^BACKENDS:/ {print substr($0, 11);}') "
	echo "${BACKENDS:-(none)}"
fi

# Disable explicitly disabled and enable explicitly enabled backends
for BACKEND in ${DISABLED_BACKENDS}; do
	BACKENDS="${BACKENDS/${BACKEND}/}"
done
for BACKEND in ${ENFORCED_BACKENDS}; do
	BACKENDS="${BACKEND} ${BACKENDS/${BACKEND} /}"
done

echo "Building with backends:                       ${BACKENDS:-(none)}"
if [ -z "$BACKENDS" ]; then
	echo "WARNING: Building without backends! You won't be able to see _any_ images." >&2
fi

echo -n "Checking if the prerequisites are installed.. "
LIBS_GTK3="`$MAKE get_libs GTK_VERSION=3 EXECUTABLE_EXTENSION=$EXECUTABLE_EXTENSION ${PKG_CONFIG:+PKG_CONFIG="$PKG_CONFIG"} ${BACKENDS:+BACKENDS="$BACKENDS"} | awk '/^LIBS:/ {print substr($0, 7);}'`"
LIBS_GTK2="`$MAKE get_libs GTK_VERSION=2 EXECUTABLE_EXTENSION=$EXECUTABLE_EXTENSION ${PKG_CONFIG:+PKG_CONFIG="$PKG_CONFIG"} ${BACKENDS:+BACKENDS="$BACKENDS"} | awk '/^LIBS:/ {print substr($0, 7);}'`"

if [ $? != 0 ]; then
	echo "failed."
	echo
	echo
	echo "Failed to run make. Is your make command compatible to GNU make?" >&2
	exit 1
fi

if ${PKG_CONFIG:-pkg-config} --exists "$LIBS_GTK3"; then
	LIBS="${LIBS_GTK3}"
	echo "ok"
else
	if ${PKG_CONFIG:-pkg-config} --exists "$LIBS_GTK2"; then
		if [ "$GTK_VERSION" = 3 ]; then
			echo "failed."
			echo
			echo
			echo "GTK 2 was found, but you manually specified --gtk-version=3, which was not found." >&2
			echo "If you want GTK3, install the development packages for" >&2
			echo " ${LIBS_GTK3}" >&2
			exit 1
		fi
		echo "ok, found GTK 2"
		GTK_VERSION=2
		LIBS="${LIBS_GTK2}"
	else
		echo "failed."
		echo
		echo
		echo "Please install either the development packages for " >&2
		echo " ${LIBS_GTK3}" >&2
		echo "or for" >&2
		echo " ${LIBS_GTK2}" >&2
		exit 1
	fi
fi

if [ "$SOURCE_DIR" != "$STARTUP_DIR" ]; then
	if ! [ -e $STARTUP_DIR/GNUmakefile ]; then
		echo "Writing GNUmakefile."
		echo "include $SOURCE_DIR/GNUmakefile" > $STARTUP_DIR/GNUmakefile
	else
		echo "Not touching existing GNUmakefile."
	fi
fi


echo "Writing config.make."
cat > $STARTUP_DIR/config.make <<EOF
DESTDIR=$DESTDIR
PREFIX=$PREFIX
GTK_VERSION=$GTK_VERSION
CROSS=$CROSS
EXECUTABLE_EXTENSION=$EXECUTABLE_EXTENSION
${PKG_CONFIG:+PKG_CONFIG=$PKG_CONFIG}
EXTRA_DEFS=${EXTRA_DEFS}
BACKENDS_BUILD=$BACKENDS_BUILD
${CFLAGS:+CFLAGS=$CFLAGS}
${LDFLAGS:+LDFLAGS=$LDFLAGS}
${CPPFLAGS:+CPPFLAGS=$CPPFLAGS}
${MANDIR:+MANDIR=$MANDIR}
${LIBDIR:+LIBDIR=$LIBDIR}
${BINDIR:+BINDIR=$BINDIR}
${BACKENDS:+BACKENDS=$BACKENDS}
${CC:+CC=$CC}
${VERBOSE:+VERBOSE=$VERBOSE}
${EXTRA_CFLAGS_SHARED_OBJECTS:+EXTRA_CFLAGS_SHARED_OBJECTS=$EXTRA_CFLAGS_SHARED_OBJECTS}
${EXTRA_CFLAGS_BINARY:+EXTRA_CFLAGS_BINARY=$EXTRA_CFLAGS_BINARY}
${EXTRA_LDFLAGS_SHARED_OBJECTS:+EXTRA_LDFLAGS_SHARED_OBJECTS=$EXTRA_LDFLAGS_SHARED_OBJECTS}
${EXTRA_LDFLAGS_BINARY:+EXTRA_LDFLAGS_BINARY=$EXTRA_LDFLAGS_BINARY}
${DEBUG_DEFS}
EOF

# Check for lcms bug
#
if [ "${BACKENDS_BUILD}" = "static" -a "${BACKENDS/poppler//}" != "${BACKENDS}" -a "${BACKENDS/spectre//}" != "${BACKENDS}" -a -n "$(which ldd 2>/dev/null)" ]; then
	echo -n "Checking if affected by liblcms bug..         "
	DIR=`tempdir`
	cd $DIR
	echo -e "#include <poppler.h>\n#include <libspectre/spectre.h>\nint main() { poppler_get_version(); spectre_status_to_string(SPECTRE_STATUS_SUCCESS); }" > test.c
	${CROSS}${CC:-cc} ${CFLAGS} test.c ${LDFLAGS} $(${PKG_CONFIG:-pkg-config} --libs --cflags ${LIBS}) -o test >/dev/null 2>&1
	if [ -e test ]; then
		if [ "$(ldd test | grep -E "liblcms[0-9]?.so" | wc -l)" -gt 1 ]; then
			echo "yes"
			echo 2>&1
			echo "WARNING: You enabled both the spectre and poppler backends, and chose static linking." >&2
			echo "Your system uses two different versions of liblcms that are known to interfere:" 2>&1
			ldd test | grep -E "liblcms[0-9]?.so" >&2
			echo "Recompile using --backends-build=shared if you experience problems." 2>&1
			echo 2>&1
		else
			echo "no"
		fi
	else
		echo "test failed"
	fi
	rm -f test.c test
	cd ..
	rmdir $DIR
fi

echo
echo "Done. Run \`$MAKE install' to install pqiv."
exit 0