#!/usr/bin/env sh

# Description: Browse Project Gutenberg catalogue by popularity, then download
#              and read a book of your choice.
#
# Details: Set the variable EBOOK_ID to download in html format and read in w3m.
#          Clear EBOOK_ID to browse available ebooks by popularity and set it to
#          the ID once you find an interesting one.
#
#          For example:
#          Wuthering Heights by Emily Brontë is at https://www.gutenberg.org/ebooks/768
#          So EBOOK_ID would be 768
#
# Shell: POSIX compliant
# Author: Arun Prakash Jana

EBOOK_ID=
DIR=${XDG_CACHE_HOME:-$HOME/.cache}/nnn/gutenbooks/"$EBOOK_ID"
BROWSE_LINK="http://www.gutenberg.org/ebooks/search/?sort_order=downloads"
BROWSER=w3m

if [ ! -z "$EBOOK_ID" ]; then
    if [ ! -e $DIR ]; then
        mkdir -p $DIR
        cd $DIR
        curl -L -O "https://www.gutenberg.org/files/"$EBOOK_ID"/"$EBOOK_ID"-h.zip"
        unzip "$EBOOK_ID"-h.zip
    fi

    if [ -d $DIR ]; then
        "$BROWSER" $DIR/"$EBOOK_ID"-h/"$EBOOK_ID"-h.htm
    fi
else
    "$BROWSER" $BROWSE_LINK
fi