haskell

#!/usr/bin/env bash

GHC_MIRROR=https://www.haskell.org/ghc

# Output lists of versions
plug_list_versions() {
    echo $(curl -s "${GHC_MIRROR}/" | grep GHC | grep Released | \
                        egrep -o '[0-9]+\.[0-9]+\.[0-9]+' | \
                        uniq | sort)
}

# Return full url for tarball for download
# and future installation
plug_url_for_download() {
    local version=$1
    echo "${GHC_MIRROR}/dist/${version}/ghc-${version}-src.tar.bz2"
}

# Checks before compilation
plug_check_deps() {
    if [ "`which ghc`" = "" ]; then
        echo "  To compile GHC from source you need pre-installed GHC version."
        echo "  Please, install system-wide GHC."
        echo "  For example, in ubuntu:"
        echo ""
        echo "    $ sudo aptitude install ghc"
    fi
}

# Overload Unpacking function
# Default way: "tar -xzf ..."
# And we need to "tar -xjf ..."
plug_unpack() {
    local tarball=$1
    local src_path=$2

    tar -xjf "$tarball" -C "$src_path"
}