Writing good documentation is hard. While I happen to think that API references generated from source code can be extremely useful, they’re only part of the story, and eventually everyone needs to write something more substantial for their software. You can get away with writing HTML directly, and separately using a word processor to write PDFs for so long, but eventually you need a proper tool chain with the following characteristics:
- Lets the author concentrate on content rather than style
- Generates multiple formats from one source (HTML, PDF, man pages, HTML Help etc)
- Does all the tedious work for you such as TOCs, cross-references, source code highlighting, footnotes
- Is friendly to source control systems & diffs in general
- Standard enough that you could submit the content to a publisher if you wanted to
- Preferably cross-platform, standards-based and not oriented to any particular language or technology
When I came to write the OGRE manual many, many years ago, I went with Texinfo - it seemed a good idea at the time, and ticked most of the boxes above. The syntax is often a bit esoteric, and the tools used to generate output frequently a bit flaky (texi2html has caused me many headaches over the years thanks to poorly documented breaking changes), but it worked most of the time.
I’ve been meaning to replace this tool chain with something else for new projects for a while, and DocBook sprung to mind since it’s the ‘new standard’ for technical documentation. It’s quite popular with open source projects now and it’s the preferred format for many publishers such as O’Reilly. In the short term, I want to write some developer instructions for OGRE for our future Mercurial setup, but in the long term, I’d really like a good documentation tool chain for all sorts of other purposes, and Texinfo feels increasingly unsatisfactory these days.
Having spent some time this week establishing a new working tool chain, and encountering & resolving a number of issues along the way, I thought I’d share my setup with you.