distributable:
  url: https://downloads.haskell.org/~ghc/{{version}}/ghc-{{version}}-src.tar.xz
  sig: "{{url}}.sig"
  strip-components: 1

versions:
  - 9.4.4
  - 9.2.4
  #TODO
  # github: ghc/ghc/tags
  # strip:
  #   - /^ghc-/
  #   - /-release$/
  # however ghc breaks every time they release a new version
  # so you are welcome to embrace trying to build it, we kindly ask they care
  # more about ensuring their monolithic nonsense has stability in builds

provides:
  - bin/ghc
  - bin/ghc-pkg
  - bin/ghci
  - bin/haddock
  - bin/hp2ps
  - bin/hpc
  - bin/hsc2hs
  - bin/runghc
  - bin/runhaskell

dependencies:
  gnu.org/gmp: 6
  invisible-island.net/ncurses: 6
  tea.xyz/gx/cc: 'c99'  # ghc uses this during builds
  sourceware.org/libffi: 3

build:
  dependencies:
    gnu.org/autoconf: ^2
    gnu.org/automake: ^1  # `aclocal` is used during the build for some reason
    tea.xyz/gx/make: '*'  #FIXME specifically, gnu make is *required*
    curl.se: '*'
    gnu.org/m4: '*'
    git-scm.org: ^2
    python.org: ^3
    gnu.org/patch: '*'
    linux:
      github.com/numactl/numactl: ^2 # ghcup needs this

  # `ghc` needs `ghc` to bootstrap `ghc`
  # The canonical way to achieve this is with `ghcup`
  # To that end, we capture $HOME so as to no pollute the user's life with unwanted
  # stage0 tooling. Instead, everything is localized to $HOME, and can be
  # cleaned up at will, and won't capture any of the user's workflow
  script: |
    export HOME="$(pwd)"

    if test -d .ghcup; then
      echo "ghcup already installed"
    else
      curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
    fi

    PATH="$HOME/.ghcup/bin:$PATH"

    if test -e $HOME/.cabal/bin; then
      rm -r $HOME/.cabal/bin
    fi

    export PATH="$HOME/.cabal/bin:$PATH"
    GHC="$HOME/.ghcup/bin/ghc"

    # We need PIC on linux-x86_64 (it's already on the other
    # platforms). This does that.
    # https://www.hobson.space/posts/haskell-foreign-library/

    sed -i.bak \
      's/\((OSLinux,   ArchAArch64) -> \[Opt_PIC, Opt_ExternalDynamicRefs\]\)/\1\n    (OSLinux,   ArchX86_64)  -> \[Opt_PIC, Opt_ExternalDynamicRefs\]/' \
      compiler/GHC/Driver/Session.hs
    rm compiler/GHC/Driver/Session.hs.bak

    ./configure $ARGS
    hadrian/build $HADRIAN_ARGS install

    for shim in $(find "{{prefix}}/bin" -type f); do
      sed -i.bak -e 's_="{{prefix}}_="$(dirname $(dirname $0))_' $shim
      rm $shim.bak
    done

    sed -i.bak 's|{{tea.prefix}}|$TEA_PREFIX|g' "{{prefix}}/bin/hsc2hs-ghc-{{version}}"
    rm "{{prefix}}/bin/hsc2hs-ghc-{{version}}.bak"
  env:
    BOOTSTRAP_HASKELL_NONINTERACTIVE: 1
    BOOTSTRAP_HASKELL_ADJUST_BASHRC: 0
    BOOTSTRAP_HASKELL_GHC_VERSION: ${{version}}
    CONF_CC_OPTS_STAGE0: $CFLAGS
    CONF_CC_OPTS_STAGE1: $CFLAGS
    CONF_CC_OPTS_STAGE2: $CFLAGS
    CONF_GCC_LINKER_OPTS_STAGE0: $LDFLAGS
    CONF_GCC_LINKER_OPTS_STAGE1: $LDFLAGS
    CONF_GCC_LINKER_OPTS_STAGE2: $LDFLAGS
    # ChatGPT
    GHC_OPTIONS: -fPIC
    ARGS:
      - --prefix={{prefix}}
      - --disable-numa
      - --with-curses-includes={{deps.invisible-island.net/ncurses.prefix}}/include/ncursesw
      - --with-intree-gmp
      - --with-system-libffi
    HADRIAN_ARGS:
      - -j
      - --docs=none
      - --flavour=release
      - --prefix="{{prefix}}"
    linux:
      C_INCLUDE_PATH: ${{deps.invisible-island.net/ncurses.prefix}}/include/ncursesw
      # ^^ yep telling `./configure` about it just aint enough
    darwin:
      ARGS:
      - --with-ffi-includes=$(xcrun --show-sdk-path)/usr/include/ffi
      # workaround `fatal error: 'ffitarget_arm64.h' file not found`
      C_INCLUDE_PATH: $(xcrun --show-sdk-path)/usr/include/ffi

test:
  script: |
    out=$(runghc $FIXTURE)
    test "$out" = "Hello World"
  fixture:
    main = putStrLn "Hello World"