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lilypond-book and comments stop generation of \usepackage Ver 2.7.20/Cha
From: |
Bernard Hurley |
Subject: |
lilypond-book and comments stop generation of \usepackage Ver 2.7.20/ChangeLog/1.4313/ |
Date: |
Thu, 01 Dec 2005 17:55:38 +0000 |
Hi,
Tests running
lilypond-book -V --psfonts testx.lytex
On files testx.lytex. with latest CVS version (1.4313)
----------------- test1.lytex ---------------- ----------------- test1.tex
----------------
%% comment %% comment
\documentclass[english]{article} \documentclass[english]{article}
\begin{document} \begin{document}
\end{document} \end{document}
----------------- test2.lytex ---------------- ----------------- test2.tex
----------------
\documentclass[english]{article} \documentclass[english]{article}
%% comment %% comment
\begin{document} \begin{document}
\end{document} \end{document}
The code for detecting whether graphics pakages are already loaded does
not work when the package is loaded as a parameter to the main class:
----------------- test3.lytex ---------------- ----------------- test3.tex
----------------
\documentclass[graphics]{article}
\documentclass[graphics]{article}
\begin{document} \usepackage{graphics}
\end{document} \begin{document}
\end{document}
Some points:
1] Detecting whether LaTeX would have loaded the graphics package by the
time you get to \begin{document} is impossible unless you are going to
parse LaTeX package files. I have been involved in LaTeX projects where
we commonly needed to load about 20 packages. So what we did was load
them in a .sty file, and only had to use one \usepackage instead of 20.
2] If the issue is whether "graphics" or "graphicx" has been loaded by
the time you get to \begin{document}, then it is a non-issue, LaTeX will
ignore the \usepackage{graphics} if either are loaded.
3] However there still is an issue here. Suppose in five years time
someone writes a package "fungraphics" that includes the same interface
as "graphics" but is inconsistent with it. (Stranger things have
happened!) if someone used \usepackage{fungraphics} in the preamble to
a .lytex file then lilypond-book would produce invalid LaTeX.
SO it is _not_ worth trying to see whether "graphics" or "graphicsx"
would have been loaded, and it actually doesn't matter.
BUT there is an issue of giving the user the option of _not_ generating
\usepackage{graphics}. This could be done by a command line switch or
maybe better with a directive like:
\lilypondGraphicsAlreadyLoaded
which would suppress the generation of "\usepackage{graphics}" if added
to the preamble.
--
Bernard Hurley <address@hidden>
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