#!/bin/bash
#############################################################
#	Script to download all images in an imgur.com album
#	to disk.
#	USAGE: ./imgur.sh http://imgur.com/a/id
#############################################################

## We do not need to set url to ''

## With unique tempfiles, multiple instances can run simuntaneously
tf=$(mktemp .imgur.XXXXX)

url=$1
## A separate usage is nice, but is is used only once: embed it into the if
if [[ -z $url ]]; then
  echo -e "Imgur Album downloader\nUsage: $0 <album url>"
  exit 1
fi

if [[ "$url" =~ "imgur.com/a/" ]]; then
  ## We have no special need for curl; wget is AFAIK more often preinstalled
  wget -q -O "$tf" "$1"
  #title=$(awk -F \" '/data-cover/ {print $6; exit}' $ass)
  ## I don't know enough about awk to speak of it, but regex is nice:
  title=$(grep -Po '(?<=data-title=").*?(?=" )' "$tf") # A lookabehind, nongreedy and ending lookahead
  albumid=$(grep -Po '(?<=id="album-).{5}(?=")' "$tf") # Ids are 5 chars
  if [[ -z $title ]]; then
    #title=$(awk -F \" '/data-cover/ {print $8}' $ass)
    ## data-cover can also be something like LPzCFb.jpg, so...
     # Let's just use the album id
    title=$albumid
  fi
    title=${title// /_}
    dir="${title//[^a-zA-Z0-9_]/}"
  if [[ -d $dir ]]; then
    echo "Directory '$dir' already exists, you may have downloaded this album before."
    exit 1
  fi
  ## Else is unneeded
  ## Worst case: Using the album id, the dirname should never be empty
  if [[ -z $dir ]]; then
    title=$albumid
  fi
  echo "Saving to '$dir'"
  mkdir -p $dir

  #for image in $(awk -F \" '/data-src/ {print $10}' $ass | sed /^$/d | sed s/s.jpg/.jpg/); do
  ## Some images are so big they won't be displayed fully. With this we get full links!
  for image in $(grep -Po '(?<=a href=")http://i\.imgur.*?(?=")' "$tf"); do
    #filename=$(sed s/http:\\/\\/i.imgur.com\\/// <<< $image)
    #...
    #fi
    ## We don't need to guess the filetype nor create the name, wget handles that (<<< is neat though)
    echo -n "Downloading '$image'..."
    wget -q -nc -P "$dir" "$image" # -P will set directory prefix, -nc won't overwrite
    if [ "$?" = "0" ]; then echo " Done."; else echo "Failed.."; fi
  done
fi

## No need to tell the user about tempfiles
rm "$tf"
echo "All done!"
#exit 0