#!/usr/bin/env bash
source "$(dirname $0)/utils.sh"

if not_installed "elm"; then
    # Download the 0.19.1 binary for Linux.
	#
	# +-----------+----------------------+
	# | FLAG      | MEANING              |
	# +-----------+----------------------+
	# | -L        | follow redirects     |
	# | -o elm.gz | name the file elm.gz |
	# +-----------+----------------------+
	#
	curl -L -o elm.gz https://github.com/elm/compiler/releases/download/0.19.1/binary-for-linux-64-bit.gz

	# There should now be a file named `elm.gz` on your Desktop.
	#
	# The downloaded file is compressed to make it faster to download.
	# This next command decompresses it, replacing `elm.gz` with `elm`.
	#
	gunzip elm.gz

	# There should now be a file named `elm` on your Desktop!
	#
	# Every file has "permissions" about whether it can be read, written, or executed.
	# So before we use this file, we need to mark this file as executable:
	#
	chmod +x elm

	# The `elm` file is now executable. That means running `~/Desktop/elm --help`
	# should work. Saying `./elm --help` works the same.
	#
	# But we want to be able to say `elm --help` without specifying the full file
	# path every time. We can do this by moving the `elm` binary to one of the
	# directories listed in your `PATH` environment variable:
	#
	sudo mv elm /usr/local/bin/
	rm {elm,elm.gz}
fi

npm install -g @elm-tooling/elm-language-server elm-format elm-test