Add a package to your Elm 0.19.1 local cache directly from GitHub

elm-cache-add.sh

#!/bin/sh

set -e

author=$1
name=$2
version=$3

if [ "$#" -lt 3 ]; then
    echo "usage: elm-cache-add.sh AUTHOR PACKAGE VERSION"
    exit 1
fi
if [ "$(elm --version)" != "0.19.1" ]; then
    echo "Globally installed elm 0.19.1 is required"
    exit 1
fi

packages=~/.elm/0.19.1/packages
pkgdir=$packages/$author/$name/$version
if [ -d "$pkgdir" ]; then
    echo "$author/$name@$version already installed"
    exit 0
fi

invalid_archive () {
    echo "Invalid archive: $author/$name@$version does not seem to exist"
    cd
    rm -f $pkgdir/archive.zip
    rmdir $pkgdir $packages/$author/$name $packages/$author 2> /dev/null
    exit 1
}

echo "Installing $author/$name@$version"
mkdir -p "$pkgdir"
cd "$pkgdir"
curl -sL -o archive.zip "https://github.com/$author/$name/zipball/$version/"
unzip -qn archive.zip 2> /dev/null || invalid_archive
rm archive.zip
dir=$(ls -d $author-$name*)
if [ -d "$dir" ]; then
    mv $dir/src $dir/LICENSE $dir/README.md $dir/elm.json .
    elm make --docs=docs.json || true
    rm -r elm-stuff
    rm -r $dir
fi