Find image links in markdown sources, put to S3 and update the link

img2s3.sh

#!/bin/sh
#
# pbrisbin 2015 - look for markdown links to local images, move them to S3 then
# update the markdown to link to it.
#
# Things to tweak:
#
#   - Processes posts/*.md
#   - Looks for "/img/image.ext"
#   - Puts img/image.ext to s3://$bucket/$(prefix $post)image.ext
#   - Replaces link with "http://$domain/$(prefix $post)image.ext"
#
###
process() {
  local post="$1" img="$2" path

  path="$(prefix "$post")$(basename "$img")"

  s3cmd --acl-public put "$img" "s3://$bucket/$path" &&
  sed -i "s%(/$img)%(http://$domain/$path)%" "$post"
}

prefix() {
  # "post/YYYY-MM-DD-title.md" --> "title/"
  echo "$(basename "$1" .md)/" | cut -c 12-
}

get_posts() { grep -Fl '/img/' posts/*.md; }
get_images() { sed '/.*\/\(img\/[^)]*\).*/!d; s//\1/' "$1"; }

bucket='images.pbrisbin.com'
domain="$bucket"

get_posts | while read post; do
  get_images "$post" | while read image; do
    process "$post" "$image"
  done
done