#!/usr/bin/env bash

tag="$(echo "$1" | tr ' ' '_' | tr 'A-Z' 'a-z')"

if [ "$tag" == "all" ]; then
	find content/blog/ -type f -name '*.md' -not -name 'xxx-*' | sort -r -u |
		cut -d '-' -f 2- | cut -d '.' -f 1
else
	find content/blog/ -type f -name '*.md' -not -name 'xxx-*' | sort -r -u |
		while read file; do
		tags="$(sed -n '/---/,/---/p' "$file" |
			sed -n '1,/---/p' | sed '/^---$/d' |
			sed '/^$/,$d' |
			yq -r 'if ( .tags | type ) == "array" then .tags else [ .tags ] end | join("\n")' |
			tr 'A-Z' 'a-z' | tr ' ' '_'
		)"
		if echo "$tags" | grep -q "$tag"; then
			echo "$file" | cut -d '-' -f 2- | cut -d '.' -f 1
		fi
	done

fi