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_yay_pkgbuild

@@ -0,0 +1,37 @@
+# Maintainer: Jguer <pkgbuilds at jguer.space>
+pkgname=yay
+pkgver=12.3.5
+pkgrel=1
+pkgdesc="Yet another yogurt. Pacman wrapper and AUR helper written in go."
+arch=('i686' 'pentium4' 'x86_64' 'arm' 'armv7h' 'armv6h' 'aarch64' 'riscv64')
+url="https://github.com/Jguer/yay"
+options=(!lto)
+license=('GPL-3.0-or-later')
+depends=(
+  'pacman>6.1'
+  'git'
+)
+optdepends=(
+  'sudo: privilege elevation'
+  'doas: privilege elevation'
+)
+makedepends=('go>=1.21')
+source=("${pkgname}-${pkgver}.tar.gz::https://github.com/Jguer/yay/archive/v${pkgver}.tar.gz")
+sha256sums=('2fb6121a6eb4c5e6afaf22212b2ed15022500a4bc34bb3dc0f9782c1d43c3962')
+
+build() {
+  export GOPATH="$srcdir"/gopath
+  export CGO_CPPFLAGS="${CPPFLAGS}"
+  export CGO_CFLAGS="${CFLAGS}"
+  export CGO_CXXFLAGS="${CXXFLAGS}"
+  export CGO_LDFLAGS="${LDFLAGS}"
+  export CGO_ENABLED=1
+
+  cd "$srcdir/$pkgname-$pkgver"
+  make VERSION=$pkgver DESTDIR="$pkgdir" PREFIX="/usr" build
+}
+
+package() {
+  cd "$srcdir/$pkgname-$pkgver"
+  make VERSION=$pkgver DESTDIR="$pkgdir" PREFIX="/usr" install
+}