Objavi 0

Publishing engine for Booktype

3 years after

Introduction

Objavi is a publishing engine primarly intender for exporting Booktype books to PDF, EPUB or ODF for distribution or printing. The name comes from the Croatian word "objavi!" meaning "publish!".

Objavi is primarily written in Python, with a substantial amount of QSAScript (an ECMAscript variant) and some Javascript, HTML, and CSS.

The development of Objavi was supported by Internews. It was extended to produce EPUB documents with support from the Internet Archive.

Currently Objavi is part of the Booktype project which is being developed by the Sourcefabric organization (www.sourcefabric.org).

Installation

See the INSTALL.txt file for installation instructions.

More Info

Objavi is part of the Booktype project, so they shared support and development forums.

Wiki https://wiki.sourcefabric.org/display/Booktype/Booktype

Support forum http://forum.sourcefabric.org/categories/booktype-support

Development forum http://forum.sourcefabric.org/categories/booktype-development

Bug tracker http://dev.sourcefabric.org/browse/OB

The objavi process

Objavi starts with a "booki-zip", as defined in the file "doc/booki-zip-standard.txt". This might be sourced from a Booktype instance, or from TWiki via the booki-twiki-gateway script, or perhaps form an EPUB imported via Espri.

PDF Output

If a PDF is required, the HTML is concatenated, various extra bits are
inserted, and the wkhtmltopdf program rederes it using WebKit.

At this point the PDF has no page numbers, no gutters, no table of
contents, and is using a too big paper size.  In order to write a
table of contents, an outline of the PDF is extracted and laid out as
html.  The table of contents thus generated is combined with other
preliminary pages and another PDF is created.

If a book PDF is required, Pdfedit is used to crop the pages down to
size and to shift them alternately left and right, creating a gutter
for the spine of the book.  Then pdfedit is used again to add page
numbers to both PDFs, with lowercase roman numbers being used for the
preliminary pages.

Finally the two PDFs are combined using pdftk and, optionally, spun
180 degrees so they appear upside down.  If a right-to-left book is
printed like this on a left-to-right printer, the binding will be on
the correct side.

Pdfedit and wkhtmltopdf both require an X server to run, for which
Xvfb is used.

For newspaper format, the page size is set to the column width, and
pdfnup is used to arrange the columns on another page.

OpenOffice output

ODF output was introduced with Objavi 2.1. This uses an Open Office instance controlled by pyuno.

EPUB output


The html in the booki-zip is manipulated into xhtml using lxml, and
the structural information and metadata is converted into EPUB form.

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Top Contributors

douglasbagnall bjandras tuukka aerkalov johanneswilm

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