Fixes the cover page for ePubs created by indesign

epub-fix-cover.bash

#!/bin/bash

# Author: Michael Bianco <http://mabblog.com/>

# Adds css width to the cover page, links the cover image on the cover page to a metadata tag
# Properly handles the mimetype on recompression
# This allows a ePub generated by InDesign to properly display the cover image on iBooks when the ePub is NOT distributed via the iBooks store

# xml compression info from: http://www.mobileread.com/forums/showthread.php?t=55681

WORKING_FOLDER=$HOME/Desktop/epub_work
PRODUCTION_FOLDER=$HOME/Desktop/epub_final

TEST_FILE=$HOME/Desktop/ePubs/test_file.epub
FILE_LIST=($TEST_FILE)

# == Comment Out the Below Code to Test on a Single ePub ==

if [[ -z "$1" ]]; then
	echo "Must specify file or directory"
	exit 1
fi

if [[ -d "$1" ]]; then
	FILE_LIST=`find "$1" -name *.epub`
else
	FILE_LIST="$1"
fi

# ===================

rm -R "$PRODUCTION_FOLDER"
mkdir "$PRODUCTION_FOLDER"

rm -R $WORKING_FOLDER
mkdir $WORKING_FOLDER

cd $WORKING_FOLDER

echo "$FILE_LIST" | while read EPUB_FILE; do
	cp "$EPUB_FILE" "$WORKING_FOLDER"
	EPUB_NAME=`basename "$EPUB_FILE"`
	unzip -q "$WORKING_FOLDER/$EPUB_NAME"
	rm "$WORKING_FOLDER/$EPUB_NAME"
	
	echo "Processing E-Pub File: $EPUB_NAME"
	echo "----------------------------------"

	# find cover page, if two are found be a bit more specific
	# note that this assumes that you're cover page contains to the word 'cover' or more specifically 'frontcover'
	COVER_FILE_NAME=`find $PWD | ack -i "cover.*\.xhtml$"`
	
	FILE_COUNT=`echo "$COVER_FILE_NAME" | wc -l`
	if [[ ${FILE_COUNT/ /} -gt 1 ]]; then
		COVER_FILE_NAME=`find $PWD | ack -i "frontcover.*\.xhtml$"`
	fi
	
	CONTENT_FILE=$PWD/OEBPS/content.opf

	if [[ ${#COVER_FILE_NAME} -eq 0 ]]; then
		echo "Invalid Cover: $EPUB_NAME"
		
		rm -R "$WORKING_FOLDER"
		mkdir "$WORKING_FOLDER"
		cd "$WORKING_FOLDER"
		
		continue
	fi

	# add the max width
	echo "Found Cover File: $COVER_FILE_NAME"
	sed -ised_backup "s/<img/<img style=\"max-width:100%\"/g" "$COVER_FILE_NAME"
	
	# search for cover image
	COVER_IMAGE_PATH=`cat "$COVER_FILE_NAME" | ack -o '<img[^>]*src="([^"]*)"' --output='$1'`
	echo "Cover Image Path: $COVER_IMAGE_PATH"
	
	# search for the cover id
	echo "Found Content File: $CONTENT_FILE"
	COVER_IMAGE_ID_PATTERN='id="([^\"]*)"[^>]*'$COVER_IMAGE_PATH'[^>]*media-type="image/jpeg"/>'
	COVER_IMAGE_ID=`ack -o -h $COVER_IMAGE_ID_PATTERN --output='$1' < "$CONTENT_FILE"`
	echo "Cover Image ID: $COVER_IMAGE_ID"

	# add cover image
	echo "Adding Cover image"
	sed -ised_backup "s/<metadata>/<metadata><meta name=\"cover\" content=\"$COVER_IMAGE_ID\" \/>/g" "$CONTENT_FILE"

	# add the spine
	echo "Adding Guide"
	COVER_FILE_BASE_NAME=`basename "$COVER_FILE_NAME"`
	sed -ised_backup "s/<\/spine>/<\/spine><guide><reference type=\"cover\" title=\"Cover\" href=\"$COVER_FILE_BASE_NAME\" \/><\/guide>/g" "$CONTENT_FILE"

	# remove the backup files
	find "$PWD" -name *sed_backup -exec rm "{}" \;

	# get a MIME type reference
	zip -q -X0 $PRODUCTION_FOLDER/$EPUB_NAME mimetype
	zip -q -rDX9 $PRODUCTION_FOLDER/$EPUB_NAME * -x "*.DS_Store" -x mimetype
	
	rm -R "$WORKING_FOLDER"
	mkdir "$WORKING_FOLDER"
	cd "$WORKING_FOLDER"
done

exit 0