feat: drop explicit makepkg usage (#134)

* generate filenames without using makepkg

* pkgbuild parser impl

* completely remove makepkg calls

* simplify typed get

* try to improve parser

* docs and recipes updatte

* never raise keyerror instead return empty string

* udpate tests

* add support of array expansion

* docs update

* tests update

* handle quoted control sequences correctly

* expand bash

* allow packages without package function

* docs update

* add moroe tests

* small improovements

* support escaped arrays and functions

tests/testresources/models/package_tpacpi-bat-git_pkgbuild

@@ -0,0 +1,30 @@
+# Maintainer: Frederik Schwan <freswa at archlinux dot org>
+# Contributor: Lucky <archlinux@builds.lucky.li>
+
+pkgname=tpacpi-bat-git
+pkgver=3.1.r13.g4959b52
+pkgrel=1
+pkgdesc='A Perl script with ACPI calls for recent ThinkPads which are not supported by tp_smapi'
+arch=('any')
+url='https://github.com/teleshoes/tpacpi-bat'
+license=('GPL3')
+depends=('perl' 'acpi_call')
+makedepends=('git')
+provides=('tpacpi-bat')
+conflicts=('tpacpi-bat')
+backup=('etc/conf.d/tpacpi')
+source=('git+https://github.com/teleshoes/tpacpi-bat.git')
+b2sums=('SKIP')
+
+pkgver() {
+  cd ${pkgname/-git/}
+  echo $(git describe --tags | sed 's/^v//;s/\([^-]*-g\)/r\1/;s/-/./g')
+}
+
+package() {
+  cd ${pkgname/-git/}
+
+  install -Dm755 tpacpi-bat "${pkgdir}"/usr/bin/tpacpi-bat
+  install -Dm644 examples/systemd_dynamic_threshold/tpacpi.service "${pkgdir}"/usr/lib/systemd/system/tpacpi-bat.service
+  install -Dm644 examples/systemd_dynamic_threshold/tpacpi.conf.d "${pkgdir}"/etc/conf.d/tpacpi
+}