Find unused assets in Jekyll

unused-uploads.sh

#!/bin/bash
for f in _uploads/*
do
  basename=$(basename "$f")
  escaped_name=$(echo -n "$basename" | ruby -e "require 'jekyll'; print Jekyll::URL.escape_path ARGF.read")
  found=$(ag -lQ "$escaped_name" _site || ag -lQ "$basename" _site)
  if [[ -z $found ]]
  then
    if [[ $1 == "--delete" ]]
    then
      echo "Deleting... $basename"
      rm "$f"
    else
      echo "$basename"
    fi
  fi
done

Before running, build site (including drafts):

bundle exec jekyll build --unpublished --future --drafts

Dry run:

./unused-uploads.sh

Delete unused uploads:

./unused-uploads.sh --delete