Emacs 'M-x compile' compatible 'purs compile' output (spago only)

spago-compile

#!/bin/bash
# compilation-mode compatible spago build output
set -eo pipefail

root=$(git rev-parse --show-toplevel)
PATH=$root/node_modules/.bin:$PATH
output=$(spago 3>&2 2>&1 1>&3 --quiet build -u --json-errors || { :; })
n_errors=$(jq <<< "$output" '.errors | length')
n_warnings=$(jq <<< "$output" '.warnings | length')

if [[ "$n_warnings" -gt 0 ]]; then
	echo "${n_warnings} warning(s):"
	jq --arg root "$root" -r <<< "$output" '.warnings[] | "Warning " + $root + "/" + .filename + " " + (.position.startLine|tostring) + ": " + .message'
fi

if [[ "$n_errors" -gt 0 ]]; then
	echo "${n_errors} error(s):"
	jq --arg root "$root" -r <<< "$output" '.errors[] | "Error " + $root + "/" + .filename + " " + (.position.startLine|tostring) + ": " + .message'
	exit 1
fi

if [[ "$1" == test ]]; then
	spago test
fi