browse top hacker news articles from the command line

hn

#!/usr/bin/env bash
#
# Author: blockloop
#
# Purpose: browse top hacker news articles from the command line
#
# Requirements:
#  jq fzf curl

set -ueo pipefail

base_url=https://hacker-news.firebaseio.com/v0
topstories_url=/topstories.json
cache_dir="/tmp/.hn-cache"

mkdir -p "${cache_dir}"

main() {
	find "${cache_dir}" \
		-type f \
		-iname topstories.json \
		-mmin +10 \
		-exec rm {} \;

	local item_urls; item_urls=$(request ${topstories_url} \
		| jq -r '.[:30] | @csv' \
		| tr ',' '\n')

	get_titles "${item_urls}" \
		| FZF_DEFAULT_OPTS="" fzf -m \
		| xargs -r -d '\n' -I% \
			grep -irl '"%"' "${cache_dir}" \
			| xargs -r cat \
			| jq -r '.url' \
			| xargs -r -n1 xdg-open 2> /dev/null

}

get_titles() {
	urls="${1}"
	for item_id in ${urls}; do
		local url; url=$(item_url "${item_id}")
		request "${url}" \
			| jq -r '.title' &
	done
}

request() {
	local uri=${1}

	local url="${base_url}${uri}"
	local cache_file_dir; cache_file_dir="${cache_dir}/$(dirname "${url//https:\/\//}")"
	local cache_file="${cache_dir}/${url//https:\/\//}"

	if [ -z "${NOCACHE:-}" ] && [ -f "${cache_file}" ]; then
		cat "${cache_file}"
	else
		mkdir -p "${cache_file_dir}" > /dev/null
		curl -LSLs "${url}" | tee "${cache_file}"
	fi
}

item_url() {
	local item="${1}"
	echo "/item/${item}.json"
}

main