docs/README

Valgrind Documentation
----------------------
This text assumes the following directory structure:

Distribution text files (eg. AUTHORS, NEWS, ...):
  valgrind/

Main /docs/ dir:
  valgrind/docs/

Top-level XML files: 
  valgrind/docs/xml/

Tool specific XML docs:
  valgrind/<toolname>/docs/

All images used in the docs:
  valgrind/docs/images/

Stylesheets, catalogs, parsing/formatting scripts:
  valgrind/docs/lib/

Some files of note:
  docs/xml/index.xml:       Top-level book-set wrapper
  docs/xml/FAQ.xml:         The FAQ
  docs/xml/vg-entities.xml: Various strings, dates etc. used all over
  docs/xml/xml_help.txt:    Basic guide to common XML tags.

The docs/internals directory contains some useful high-level stuff about
Valgrind's internals.  It's not relevant for the rest of this discussion.


Overview
---------
The Documentation Set contains all books, articles,
etc. pertaining to Valgrind, and is designed to be built as:
- chunked html files
- PDF file
- PS file

The whole thing is a "book set", made up of multiple books (the user
manual, the FAQ, the tech-docs, the licenses).  Each book could be
made individually, but the build system doesn't do that.

CSS: the style-sheet used by the docs is the same as that used by the
website (consistency is king).  It might be worth doing a pre-build diff
to check whether the website stylesheet has changed.


The build process
-----------------
It's not obvious exactly when things get built, and so on.  Here's an
overview:

- The HTML docs can be built manually by running 'make html-docs' in
  valgrind/docs/.  (Don't use 'make html'; that is a valid built-in
  automake target, but does nothing.)  Likewise for PDF/PS with 'make
  print-docs'.

- 'make dist' (nb: at the top level, not in docs/) puts the XML files
  into the tarball.  It also builds the HTML docs and puts them in too, 
  in valgrind/docs/html/ (including style sheets, images, etc).

- 'make install' installs the HTML docs in
  $(install)/share/doc/valgrind/html/, if they are present.  (They will
  be present if you are installing from the result of a 'make dist'.
  They might not be present if you are developing in a Subversion
  workspace and have not built them.)  It doesn't install the XML docs,
  as they're not useful installed.

If the XML processing tools ever mature enough to become standard, we
could just build the docs from XML when doing 'make install', which
would be simpler.


The XML Toolchain
------------------
I spent some time on the docbook-apps list in order to ascertain
the most-useful / widely-available / least-fragile / advanced
toolchain.  Basically, everything has problems of one sort or
another, so I ended up going with what I felt was the
least-problematical of the various options.

The maintainer is responsible for ensure the following tools are
present on his system:
- xmllint:    using libxml version 20620
- xsltproc:   Using libxml 20620, libxslt 10114 and libexslt 812
                (Nb:be sure to use a version based on libxml2 
                version 2.6.11 or later.  There was a bug in 
	              xml:base processing in versions before that.)
- pdfxmltex:  pdfeTeX 3.141592-1.21a-2.2 (Web2C 7.5.4)
- pdftops:    version 3.00
- DocBook:    version 4.2
- bzip2       

A big problem is latency.  Norman Walsh is constantly updating
DocBook, but the tools tend to lag behind somewhat.  It is
important that the versions get on with each other.  If you
decide to upgrade something, then it is your responsibility to
ascertain whether things still work nicely - this *cannot* be
assumed.

Print output: if make expires with an error, cat output.
If you see something like this:
  ! TeX capacity exceeded, sorry [pool size=436070]

then look at this:
  http://lists.debian.org/debian-doc/2003/12/msg00020.html
and modify your texmf files accordingly.



Catalog/Stylesheet Location
---------------------------
/etc/xml/ seems to have become the standard place for catalogs
in recent distros.



Notes [Nov. 2004]:
-----------------
- the end of file.xml must have only ONE newline after the last tag:
  </book>
- pdfxmltex barfs if given a filename with an underscore in it


Notes [July 2005]
-----------------
jrs had to install zillions of packages on SuSE 9.2 in order to
build the print docs (make print-docs), including
   passivetex
   xpdf (for pdftops, which does the nicest job)

Even then, pdfxmltex eventually dies with "TeX capacity exceeded,
sorry [pool size = 67555]" or some such.  To fix this, he edited
/etc/texmf/texmf.cnf and changed
   pool_size.pdfxmltex = 500000
to 
   pool_size.pdfxmltex = 1500000 
and that fixed it.


Notes [Nov. 2005]
-----------------
After upgrading to Suse 10, found a (known) bug in PassiveTex which 
broke the build, so added a bug-fix to 'docs/lib/vg-fo.xsl'.
Bug-fix related links:
http://lists.oasis-open.org/archives/docbook/200509/msg00032.html
http://www.dpawson.co.uk/docbook/tools.html#d850e300
http://www.haskell.org/pipermail/glasgow-haskell-bugs/2005-January.txt


References:
----------
- samba have got all the stuff
http://websvn.samba.org/listing.php?rep=4&path=/trunk/&opt=dir&sc=1

excellent on-line howto reference:
- http://www.cogent.ca/

using automake with docbook:
- http://www.movement.uklinux.net/docs/docbook-autotools/index.html

Debugging catalog processing:
- http://xmlsoft.org/catalog.html#Declaring
  xmlcatalog -v <catalog-file>

shell script to generate xml catalogs for docbook 4.1.2:
- http://xmlsoft.org/XSLT/docbook.html

configure.in re pdfxmltex
- http://cvs.sourceforge.net/viewcvs.py/logreport/service/configure.in?rev=1.325

some useful xls stylesheets in cvs:
- http://cvs.sourceforge.net/viewcvs.py/perl-xml/perl-xml-faq/


TODO LESS CRUCIAL:
------------------
- concat titlepage + subtitle page in fo output
- try and get the QuickStart and FAQ titlepages and tocs onto the same page