Gxneur-git package build script for ArchLinux (needs review before publish in AUR)

PKGBUILD-gxneur-git.sh

# Maintainer: Andrew Shark <ashark@linuxcomp.ru>

pkgname=gxneur-git
pkgver=0.20.0.r155.75ebdcc
pkgrel=1
pkgdesc="GTK frontend for xneur (Auto Keyboard Layout Switcher)"
arch=('x86_64')
url="https://xneur.ru/"
license=('GPL')
depends=()
makedepends=('git' 'gcc' 'make' 'cmake')
optdepends=()
provides=('gxneur')
conflicts=('gxneur')
source=( #'git+https://github.com/AndrewCrewKuznetsov/xneur-devel' # Choose only one of these sources
         #'git+https://github.com/Ashark/xneur-devel' # I use it when developing
        )
sha1sums=( #'SKIP'
        )

pkgver() {
    cd xneur-devel
    xnrelver=`cat gxneur/CMakeLists.txt | grep "xneur VERSION" | cut -f3 -d ' ' | tr -d ")"`
    printf "$xnrelver.r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
}

# set amake or cmake here
build_system=cmake

prepare() {
    mkdir -p ${srcdir}/xneur-devel/gxneur/build
    cd ${srcdir}/xneur-devel/gxneur # I use it when developing
    git checkout transition-to-cmake # I use it when developing

    if [[ $build_system == cmake ]]; then
		echo wip prepare
		mkdir -p ${srcdir}/xneur-devel/gxneur/build
	elif [[ $build_system == amake ]]; then
		cd ${srcdir}/xneur-devel/gxneur
		touch {README,TODO} # without these files automake will not work
	fi
}

build() {
    if [[ $build_system == cmake ]]; then

		# clear cache. I use for debugging while developing
		echo "${srcdir}/xneur-devel/gxneur/build"
		if [ -d "${srcdir}/xneur-devel/gxneur/build" ]; then # PLEASE rm trailing slash from other PKGBUILDs also
			: # if statement should contain at least something (empty op).
# 			rm -r ${srcdir}/xneur-devel/gxneur/build/* # Comment if do not want to clear cache # PLEASE
		fi
		
        cd ${srcdir}/xneur-devel/gxneur/build
        cmake .. -DCMAKE_INSTALL_PREFIX=/usr
        make
    elif [[ $build_system == amake ]]; then
        cd ${srcdir}/xneur-devel/gxneur
        ./autogen.sh --prefix=/usr # autogen.sh creates configure file and runs it with parameters
        make
    fi
}

package() {
    if [[ $build_system == cmake ]]; then
        cd ${srcdir}/xneur-devel/gxneur/build
		make DESTDIR=${pkgdir} install
    elif [[ $build_system == amake ]]; then
        cd ${srcdir}/xneur-devel/gxneur
		make DESTDIR=${pkgdir} install
# 		make clean # removing am build-time stuff from sources
    fi
}