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# Haskell package guidelines

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Reason: Please help improve this article by creating reasonable package creation guidelines for Haskell packages. (Discuss in Talk:Haskell package guidelines)

This document aims to cover standards and guidelines for producing good Haskell packages on Arch.

Until this document is written, contact User:Felixonmars.

## Package naming

For Haskell libraries, use `haskell-libraryname` usually the same name as on hackage.

Note: The package name should be entirely lowercase.

## Architecture

See PKGBUILD#arch.

Every Haskell library or program is architecture-dependent.

## Source

The preferred source of a Haskell program or library is from hackage. PKGBUILD#source `source=()` array should use the following URL template:

    https://hackage.haskell.org/packages/archive/$_hkgname/$pkgver/$_hkgname-$pkgver.tar.gz

Note that a custom `_hkgname` variable is used instead of `pkgname` since Haskell packages are generally prefixed with haskell-. This variable can generically be defined as follows:

    _hkgname=stm-delay

## Rebuild order

When a Haskell library changes its build flags or is updated, all dependent packages need to be rebuilt. The genrebuild tool can be used to find out what needs rebuilding and how. Example usage:

    $ ./genrebuild -H haskell-basement

## Using arch-hs

arch-hs is provided to automate `PKGBUILD` generation and maintenance.

To generate a series of `PKGBUILD`s for a Hackage package (and its unpackaged dependencies):

    $ arch-hs -o /path/to/workdir library_name

To compare dependencies and other packaging metadata for updating an existing package:

    $ arch-hs-diff library_name old_version new_version

To compare Arch [extra] package versions and their corresponding Hackage package versions:

    $ arch-hs-sync check

Note that `arch-hs` uses cabal-install to maintain Hackage databases, so please update your cabal-install database regularly to keep them fresh:

    $ cabal update

## PKGBUILD library example

Packaging a Haskell library is different from packaging a Haskell program, the libraries packaged in Arch Linux are meant to be used by packaged Haskell programs.

    PKGBUILD

    # Maintainer: Your Name <youremail@domain.com>
    _hkgname=stm-delay
    pkgname=haskell-stm-delay
    pkgver=
    pkgrel=1
    license=()
    arch=('x86_64')
    url="https://hackage.haskell.org/package/$_hkgname"
    depends=(ghc-libs)
    makedepends=(ghc)
    source=("https://hackage.haskell.org/packages/archive/$_hkgname/$pkgver/$_hkgname-$pkgver.tar.gz")
    sha256sums=()

    build() {
      cd "$_hkgname-$pkgver"

      runhaskell Setup configure -O --enable-shared --enable-debug-info --enable-executable-dynamic --disable-library-vanilla \
        --prefix=/usr --docdir="/usr/share/doc/$pkgname" --datasubdir=$pkgname --enable-tests \
        --dynlibdir=/usr/lib --libsubdir=\$compiler/site-local/\$pkgid \
        --ghc-option=-optl-Wl\,-z\,relro\,-z\,now \
        --ghc-option='-pie'

      runhaskell Setup build $MAKEFLAGS
      runhaskell Setup register --gen-script
      runhaskell Setup unregister --gen-script
      sed -i -r -e "s|ghc-pkg.*update[^ ]* |&'--force' |" register.sh
      sed -i -r -e "s|ghc-pkg.*unregister[^ ]* |&'--force' |" unregister.sh
    }

    check() {
      cd "$_hkgname-$pkgver"
      runhaskell Setup test
    }

    package() {
      cd "$_hkgname-$pkgver"

      install -D -m744 register.sh "$pkgdir/usr/share/haskell/register/$pkgname.sh"
      install -D -m744 unregister.sh "$pkgdir/usr/share/haskell/unregister/$pkgname.sh"
      runhaskell Setup copy --destdir="$pkgdir"
      install -D -m644 "LICENSE" "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
      rm -f "${pkgdir}/usr/share/doc/${pkgname}/LICENSE"
    }

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