curler fooo

curler.sh

#!/usr/bin/env bash

set -e
set -u
set -o pipefail

URL='https://github.com/laidbackware/nsx-search/releases/download/v0.0.1/nsxsearch-darwin-0.0'
# URL='google.com'

# Should behave exaclty like curl and takes all the same args, except:
# - it only takes one URL, as the first argument
# - you cannot use `-o` but need to redirect the func's stdout instead
# - you must not use `-w` and override the output format
curler() {
	local url="$1"
	shift

	local sout respCode

	exec {sout}>&1
		respCode="$(
			# does this (/dev/fd/...) work on Darwin and other *nixes?
			curl -w "%{response_code}" -o "/dev/fd/${sout}" "${@}" "$url" || true
		)"
	exec {sout}>&-

	# So if we use respCode as a return code of the funtion, then 256 would
	# actually become 0, 257 would become 1, ... ; or in other words: 404 would
	# become 148, 500 would become 244, ...
	#
	# But anyway, we have the actual http response code available here and can
	# do whatever; Stdout & Stderr have not been mangled with but just passed
	# on to Stdout & Stderr of the caller (and can be redirected there, if need be)
	if [[ $respCode -lt 200 ]] || [[ $respCode -gt 299 ]] ; then
		return "$respCode"
	fi
	return 0

	# Alternative, something like mimicking `--fail`:
	if [[ $respCode -lt 200 ]] || [[ $respCode -gt 299 ]] ; then
		# Stdout & Stderr have already been pushed by curl itself, here we just
		# "append" the reponse code to the Stderr stream
		echo "# ResponseCode: $respCode" >&2
		return 22 # `--fail`'s default return code
	fi
	return 0
}

curlOpts=(
	-s -L
	# --fail
)
rc=0
curler "$URL" "${curlOpts[@]}" || rc=$?
echo "** curler returned: $rc"