WARNING

This is script is very fragile. Don't use it unless you know what it does!

About

generates compressed PDF from DjVu and tries to include text layers from the original DjVu file. I have no idea what happens in case there is no embedded text.

(nontrivial) Dependencies

• djvused: To extract metadata like the TOC and the number of pages.
• ddjvu: To split the djvu file into tiff pages.
• djvu2hocr: To extract the OCR layers for pdfbeads.
• pdfbeads: To combine TIFF images and OCR content into a highly compressed pdf file.
• djvu2pdf_toc_parser.py: A python script to convert the TOC for pdfbeads.

TODO

Handle arguments

The basic use case for now is only djvu2pdf [input] [output], but we should at least make sure that

• exactly two arguments are provided
• input exists
• output is writable (otherwise we'd lose a lot of precious work)

Furthermore, it might be nice to have the option to include a pdfbeads-compatible TOC with the input file (the indentation-based syntax is nice, so one might decide to write a TOC). This feature could be introduced through the flag --toc=[table of contents file]

Handle errors along the way

• If input is not a djvu file, then we should fail instantly.
• If some dependency isn't installed, we should quit immediately (but it is not our job to make sure they are set up correctly if they are there).
• If there is no embedded text then we should not output any temporary html files along the way.