gen_pkgbuild

#!/usr/bin/env perl
# usage: pass any arguments to print to stdout, otherwise this will 
# create or overwrite PKGBUILD in current directory
use strict;
use warnings;

chomp(my $commit = `git rev-parse HEAD`);
chomp(my $version = `git describe --tags --abbrev=0 --match 'v*.*'`);
chomp(my $tag_commit = `git rev-parse '$version'`);
my $tagged = ($commit eq $tag_commit);
$version =~ s/^v//;
die "invalid version tag!" unless $version =~ /^\d+(\.\d+)+(\.?[a-zA-Z0-9]+)?$/;

my $source = "commit=$commit";
my $suffix = "";
if (!$tagged) {
	$suffix = "-git\nprovides=('cplot')\nconflicts=('cplot')";
	$source = "branch=master";
	$version = "0";
}

my $F;
if (@ARGV) {
	$F = *STDOUT;
} else {
	open($F,'>','PKGBUILD') or die $!;
}

print $F "# Maintainer: Torsten Hilgenberg <th\@zoon.cc>

pkgname=cplot$suffix
pkgver=$version
pkgrel=1
pkgdesc='Function plotter for real and complex mathematical functions'
url='https://zoon.cc/cplot/'
license=('MIT')
arch=('x86_64')

depends=('zlib' 'sdl2' 'libgl' 'glu' 'glew' 'glibc' 'pango' 'cairo')
makedepends=('git' 'python>=3.0.0' 'ninja' 'boost')
source=('git+https://github.com/hilgenberg/cplot#$source')
sha256sums=('SKIP')
";

print $F q!
pkgver() {
	cd "$srcdir/cplot/"
	git describe --long --tags --match 'v*.*' | sed 's/^v//;s/\([^-]*-g\)/r\1/;s/-/./g'
}
! unless $tagged;

print $F '
prepare() {
	cd "$srcdir/cplot/"
	git submodule update --init --recursive --depth 1
}

build() {
	cd "$srcdir/cplot/"
	./build release
}

package() {
	cd "$srcdir/cplot/"
	install -Dm755 -t "$pkgdir/usr/bin/" build_release/cplot
	install -Dm644 -t "$pkgdir/usr/share/cplot/" Plot\ Examples/*.cplot
	install -Dm644 -t "$pkgdir/usr/share/licenses/cplot/" LICENSE
}
';

close($F);