The SCons Docbook tool
This tool tries to make working with Docbook in SCons a little easier. It provides several toolchains for creating different output formats, like HTML or PDF. Contained in the package is a distribution of the Docbook XSL stylesheets as of version 1.76.1. As long as you don't specify your own stylesheets for customization (see Selecting stylesheet), these official versions are picked as default...which should reduce the inevitable setup hassles for you.
Implicit dependencies to images and XIncludes are detected automatically if you meet the HTML requirements (see Requirements). The additional stylesheet utils/xmldepend.xsl by Paul DuBois is used for this purpose.
Note, that there is no support for XML catalog resolving offered! This tool calls the XSLT processors and PDF renderers with the stylesheets you specified, that's it. The rest lies in your hands and you still have to know what you're doing when resolving names via a catalog.
Installing it, requires you to copy (or, even better: checkout) the contents of the package's docbook folder to
- "/path_to_your_project/site_scons/site_tools/docbook", if you need the Docbook Tool in one project only, or
- "~/.scons/site_scons/site_tools/docbook", for a system-wide installation under your current login.
For more infos about this, please refer to
- the SCons User's Guide, chap. 19.7 "Where to put your custom Builders and Tools" and
- the SCons Tools Wiki page at http://scons.org/wiki/ToolsIndex.
How to activate
For activating the tool "docbook", you have to add its name to the Environment constructor, like this
env = Environment(tools=['docbook'])
On its startup, the Docbook tool tries to find a required xsltproc processor, and a PDF renderer, e.g. fop. So make sure that these are added to your system's environment PATH and can be called directly, without specifying their full path.
For the most basic processing of Docbook to HTML, you need to have installed
- the Python lxml binding to libxml2, or
- the direct Python bindings for libxml2/libxslt, or
- a standalone XSLT processor, currently detected are xsltproc, saxon, saxon-xslt and xalan.
Rendering to PDF requires you to have one of the applications fop, xep or jw installed.
Creating a HTML or PDF document is very simple and straightforward. Say
env = Environment(tools=['docbook']) env.DocbookHtml('manual.html', 'manual.xml') env.DocbookPdf('manual.pdf', 'manual.xml')
to get both outputs from your XML source manual.xml. As a shortcut, you can give the stem of the filenames alone, like this:
env = Environment(tools=['docbook']) env.DocbookHtml('manual') env.DocbookPdf('manual')
and get the same result. Target and source lists are also supported:
env = Environment(tools=['docbook']) env.DocbookHtml(['manual.html','reference.html'], ['manual.xml','reference.xml'])
env = Environment(tools=['docbook']) env.DocbookHtml(['manual','reference'])
Whenever you leave out the list of sources, you may not specify a file extension! The Tool uses the given names as file stems, and adds the suffixes for target and source files accordingly.
The rules given above are valid for the Builders DocbookHtml, DocbookPdf and DocbookSlidePdf. For the DocbookMan transformation you can specify a target name, but the actual output names are automatically set from the refname entries in your XML source. The DocbookXInclude Builder requires a target and source parameter. They have to differ because input and output files usually carry the same suffix (*.xml).
Please refer to the section Chunked output for more infos about the other Builders.
Selecting your own stylesheet
If you want to use a specific XSL file, you can set the additional xsl parameter to your Builder call as follows:
env.DocbookHtml('other.html', 'manual.xml', xsl='html.xsl')
Since this may get tedious if you always use the same local naming for your customized XSL files, e.g. html.xsl for HTML and pdf.xsl for PDF output, a set of variables for setting the default XSL name is provided. These are:
DOCBOOK_DEFAULT_XSL_HTML DOCBOOK_DEFAULT_XSL_HTMLCHUNKED DOCBOOK_DEFAULT_XSL_HTMLHELP DOCBOOK_DEFAULT_XSL_PDF DOCBOOK_DEFAULT_XSL_MAN DOCBOOK_DEFAULT_XSL_SLIDESPDF DOCBOOK_DEFAULT_XSL_SLIDESHTML
and you can set them when constructing your environment:
env = Environment(tools=['docbook'], DOCBOOK_DEFAULT_XSL_HTML='html.xsl', DOCBOOK_DEFAULT_XSL_PDF='pdf.xsl') env.DocbookHtml('manual') # now uses html.xsl
The Builders DocbookHtmlChunked, DocbookHtmlhelp and DocbookSlidesHtml are special, in that:
- they create a large set of files, where the exact names and their number depend on the content of the source file, and
- the main target is always named index.html, i.e. the output name for the XSL transformation is not picked up by the stylesheets.
As a result, there is simply no use in specifying a target HTML name. So the basic syntax for these builders is:
env = Environment(tools=['docbook']) env.DocbookHtmlhelp('manual')
Only if you use the root.filename (titlefoil.html for slides) parameter in your own stylesheets you have to give the new target name. This ensures that the dependencies get correct, especially for the cleanup via "scons -c":
env = Environment(tools=['docbook']) env.DocbookHtmlhelp('mymanual.html','manual', xsl='htmlhelp.xsl')
Some basic support for the base.dir is added (this has not been properly tested with variant dirs, yet!). You can add the base_dir keyword to your Builder call, and the given prefix gets prepended to all the created filenames:
env = Environment(tools=['docbook']) env.DocbookHtmlhelp('manual', xsl='htmlhelp.xsl', base_dir='output/')
Make sure that you don't forget the trailing slash for the base folder, else your files get renamed only!
A simple list of all builders currently available:
- Single HTML file.
- Chunked HTML files, with support for the base.dir parameter. The chunkfast.xsl file (requires "EXSLT") is used as the default stylesheet.
- Htmlhelp files, with support for base.dir.
- PDF output.
- Man pages.
- Slides in PDF format.
- Slides in HTML format, with support for base.dir.
- Can be used to resolve XIncludes in a preprocessing step.
This work is still in a very basic state and hasn't been tested well with things like variant dirs, yet. Unicode problems and poor performance with large input files may occur. There will definitely arise the need for adding features, or a variable. Let us know if you can think of a nice improvement or have worked on a bugfix/patch with success. Enter your issues at the Launchpad bug tracker for the Docbook Tool, or write to the User General Discussion list of SCons at email@example.com.