configure

#!/bin/sh

#clean up
if [ -e Makefile ]; then
	rm Makefile;
fi

#tmp files
MAKEFILE="$(mktemp)"
UNINSTALL_FILES="$(mktemp)"
UNINSTALL_DIRS="$(mktemp)"

#set default options
PYTHON="/usr/bin/python3"

USR_BIN_FILES="backintime-qt backintime-qt_polkit"
DBUS_SERVICE_FILES="net.launchpad.backintime.serviceHelper.service"

usage () {
    echo "Usage:"
    echo "$0 [--python | --python3 | --python=PYTHON_BINARY]"
    echo ""
    echo "--python"
    echo "\tuse 'python' to start Python3"
    echo "--python3"
    echo "\tuse 'python3' to start Python3"
    echo "--python=PYTHON_BINARY"
    echo "\tuse PYTHON_BINARY to start Python3"
}

addInstallFiles () {
    file=$1
    dest=$2
    mode=$3
    if [ -z "$mode" ]; then
        mode=644
    fi
    for i in $(ls $file); do
        addInstallFile "$i" "$dest" "$mode"
    done
}

addInstallFile () {
    file=$1
    dest=$2
    mode=$3
    if [ -z "$mode" ]; then
        mode=644
    fi
    printf "\tinstall --mode=$mode $file \$(DEST)$dest\n" >> ${MAKEFILE}
    addUninstallFile "$file" "$dest"
}

addInstallFileRename () {
    file=$1
    dest=$2
    mode=$3
    if [ -z "$mode" ]; then
          mode=644
    fi
    printf "\tinstall --mode=$mode $file \$(DEST)$dest\n" >> ${MAKEFILE}
    addUninstallFileRename "$dest"
}

addUninstallFile () {
    file=$(basename "$1")
    dest=$2
    printf "\trm -f \$(DEST)$dest/$file\n" >> ${UNINSTALL_FILES}
}

addUninstallFileRename () {
    file=$1
    printf "\trm -f \$(DEST)$file\n" >> ${UNINSTALL_FILES}
}

addInstallDir () {
    dest=$1
    printf "\tinstall -d \$(DEST)$dest\n" >> ${MAKEFILE}
    addUninstallDir "$dest"
}

addUninstallDir () {
    dest=$1
    printf "\tif [ -d \$(DEST)$dest ]; then rmdir --ignore-fail-on-non-empty \$(DEST)$dest; fi\n" >> ${UNINSTALL_DIRS}
}

addComment () {
    printf "\t# Install $1\n" >> ${MAKEFILE}
    printf "\t# Uninstall files $1\n" >> ${UNINSTALL_FILES}
    printf "\t# Uninstall directory $1\n" >> ${UNINSTALL_DIRS}
}

addNewline () {
    printf "\n" >> ${MAKEFILE}
    printf "\n" >> ${UNINSTALL_FILES}
    printf "\n" >> ${UNINSTALL_DIRS}
}

#get commandline arguments
unknown_args=""
for arg in $*; do
	case $arg in
        --python=*)
            PYTHON=$(echo $arg | cut -f2 -d'=')
            ;;
        --python3)
            PYTHON="/usr/bin/python3"
            ;;
        --python)
            PYTHON="/usr/bin/python"
            ;;
        --help | -h) usage; exit 0;;
        *) unknown_args="$unknown_args $arg";;
	esac
done

if [ -n "$unknown_args" ]; then
	echo "Unknown Arguments: $unknown_args"
fi

if [ ! -f "$PYTHON" ]; then
    echo "Warning: \"${PYTHON}\" not found on this computer"
fi

#patch python command
#use 'python' or 'python3' to start Python Version 3.x
if [ -n "$(sed -e "s#^/usr/bin/python3\? #${PYTHON} #gw /dev/stdout" -i $USR_BIN_FILES)" ] \
    && [ -n "$(sed -e "s#^Exec=/usr/bin/python3\? #Exec=${PYTHON} #gw /dev/stdout" -i $DBUS_SERVICE_FILES)" ]
then
    echo "Replacement of python path with \"${PYTHON}\" successful."
else
    echo "WARNING: Replacement of python path with \"${PYTHON}\" FAILED. Maybe you ran configure more than once?"
fi

#start Makefile
printf "PREFIX=/usr\n" >> ${MAKEFILE}
printf "DEST=\$(DESTDIR)\$(PREFIX)\n\n" >> ${MAKEFILE}

printf "all:\tbuild\n\n" >> ${MAKEFILE}

printf "build:\tcompress\n\n" >> ${MAKEFILE}

printf "clean:\n" >> ${MAKEFILE}
printf "\trm -f po/*.mo\n" >> ${MAKEFILE}
printf "\trm -f man/C/*.gz\n\n" >> ${MAKEFILE}

# Create install and uninstall target
printf "install:\n" >> ${MAKEFILE}

# Migration
printf "\t# Clean-up installed old files that were renamed or moved in later BiT versions\n" >> ${MAKEFILE}
printf "\trm -f \$(DEST)/etc/dbus-1/system.d/net.launchpad.backintime.serviceHelper.conf\n" >> ${MAKEFILE}
printf "\trm -f \$(DEST)/share/backintime/plugins/qt4plugin.py\n" >> ${MAKEFILE}
addNewline

printf "\t# Inject version string into source files\n" >> ${MAKEFILE}
printf "\t(cd .. && ./updateversion.sh)\n" >> ${MAKEFILE}
addNewline

addComment "python"
addUninstallDir          "/share/backintime/qt/__pycache__"
addUninstallFile "*.pyc" "/share/backintime/qt/__pycache__"
addInstallDir            "/share/backintime/qt"
addInstallFiles "*.py"   "/share/backintime/qt"
addNewline

addComment "plugin"
addUninstallDir                "/share/backintime/plugins/__pycache__"
addUninstallFile "*.pyc"       "/share/backintime/plugins/__pycache__"
addInstallDir                  "/share/backintime/plugins"
addInstallFiles "plugins/*.py" "/share/backintime/plugins"
addUninstallDir                "/share/backintime"
addNewline

addComment "application"
addInstallDir                           "/bin"
addInstallFile "backintime-qt"         "/bin" "755"
addInstallFile "backintime-qt_polkit"  "/bin" "755"
addInstallDir "/share/metainfo"
addInstallFile "io.github.bit_team.back_in_time.gui.metainfo.xml" "/share/metainfo"
addNewline

addComment "dbus service"
addInstallDir                                       "/share/dbus-1/system-services"
addInstallFiles "net.launchpad.backintime*.service" "/share/dbus-1/system-services"
addUninstallDir                                     "/share/dbus-1"
addNewline

addComment "dbus conf"
addInstallDir                                    "/share/dbus-1/system.d"
addInstallFiles "net.launchpad.backintime*.conf" "/share/dbus-1/system.d"
addUninstallDir                                  "/share/dbus-1"
addUninstallDir                                  "/share"
addNewline

addComment "polkit action"
addInstallDir                                      "/share/polkit-1/actions"
addInstallFiles "net.launchpad.backintime*.policy" "/share/polkit-1/actions"
addUninstallDir                                    "/share/polkit-1"
addNewline

addComment "documentation"
addInstallDir                        "/share/doc/backintime-qt"
addInstallFile "../debian/copyright" "/share/doc/backintime-qt"
addInstallFile "../AUTHORS"          "/share/doc/backintime-qt"
addInstallFile "../LICENSE"          "/share/doc/backintime-qt"
addInstallFile "../README.md"        "/share/doc/backintime-qt"
addInstallFile "../TRANSLATIONS"     "/share/doc/backintime-qt"
addInstallFile "../CHANGES"          "/share/doc/backintime-qt"
addNewline

addComment ".desktop"
addInstallDir               "/share/applications"
addInstallFiles "*.desktop" "/share/applications"
addNewline

addComment "man"
addInstallDir    "/share/man/man1"
addInstallFile   "man/C/backintime-qt.1.gz" "/share/man/man1"
addUninstallDir  "/share/man"
addNewline

addComment "icons"
for f in "scalable" "48x48" "32x32" "24x24" "22x22" "16x16"; do
    addInstallDir                                           "/share/icons/hicolor/${f}/actions"
    addInstallFile  "icons/${f}/actions/show-hidden.svg"    "/share/icons/hicolor/${f}/actions"
    addUninstallDir                                         "/share/icons/hicolor/${f}"
done
addUninstallDir                                             "/share/icons/hicolor"
addUninstallDir                                             "/share/icons"
addUninstallDir                                             "/share"
addNewline

#compress
printf "compress:\n" >> ${MAKEFILE}
printf "\t# Man pages\n" >> ${MAKEFILE}
printf "\tfor i in \$\$(ls -1 man/C/); do case \$\$i in *.gz|*~) continue;; *) gzip -n --best -c man/C/\$\$i > man/C/\$\${i}.gz;; esac; done\n\n" >> ${MAKEFILE}

# Uninstall
printf "uninstall: uninstall_files uninstall_dirs\n\n" >> ${MAKEFILE}
printf "uninstall_files:\n" >> ${MAKEFILE}
cat ${UNINSTALL_FILES} >> ${MAKEFILE}
printf "uninstall_dirs:\n" >> ${MAKEFILE}
cat ${UNINSTALL_DIRS} >> ${MAKEFILE}

#copy Makefile
mv ${MAKEFILE} Makefile
chmod 644 Makefile

#clean up
for i in "${UNINSTALL_FILES}" "${UNINSTALL_DIRS}"; do
    if [ -e "$i" ]; then
        rm "$i"
    fi
done

# check python version
PYTHON_VERSION_REQUIRED="3.8"
PYTHON_VERSION_CURRENT=$(${PYTHON} --version | tr --delete 'Python ')

# Credits: https://unix.stackexchange.com/a/285928/136851
if [ "$(printf '%s\n' "$PYTHON_VERSION_REQUIRED" "$PYTHON_VERSION_CURRENT" | sort -V | head -n1)" != "$PYTHON_VERSION_REQUIRED" ]; then
    printf "Error: Wrong Python version ${PYTHON_VERSION_CURRENT}. "
    printf "But minimal version ${PYTHON_VERSION_REQUIRED} required.\n"
    exit 1
fi

printf "All OK. Now run:\n"
printf "    make\n"
printf "    sudo make install\n"