Download 4chan images to the current directory.

fourget.sh

#!/usr/bin/env sh

# Download 4chan images to the current directory.
#
# example: fourget http://boards.4chan.org/int/thread/48964967
#
# requires httpie to be installed.

# The MIT License (MIT)
#
# Copyright (c) 2015 Tim Martin
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#


USAGE="usage: fourget <4chan-url>"

die_with_status () {
  status=1
  printf >&2 '%s\n' "$*"
  exit "$status"
}

HTTP_URL=$1

if [ -z "$HTTP_URL" ]; then
  die_with_status $USAGE
fi

BOARD=$(echo $HTTP_URL | cut -d "/" -s -f 4)
THREAD=$(echo $HTTP_URL | cut -d "/" -s -f 6)

if [ -z "$BOARD" ]; then
  die_with_status "error: unable to parse board"
fi

if [ -z "$THREAD" ]; then
  die_with_status "error: unable to parse thread number"
fi

http http://a.4cdn.org/$BOARD/thread/$THREAD.json | jq '.posts|map(select(.tim != null))|map((.tim|tostring)+.ext)|map("http://i.4cdn.org/'$BOARD'/"+.)[]'|xargs -I {} http --download GET {}