On Wed, 21 Nov 2012, Thomas Weißschuh wrote:
Hi,
when using (latest) pgfplots with ConTeXt standalone the following error
occurs in tex/generic/pgfplots/util/pgfplotsutil.code.tex:1979 :
! LuaTeX error <\directlua >:1: module 'pgfplots.lua' not found:
This is the same exact message and error location as the bug reported
by Aditya last month, but this time it's a different issue.
It seems like the workaround for the previous bug shadowed this one.
For the record: My version of pgfplot has the fix for the previous bug
already included.
Problem background:
The lua function require() appends the .lua file extension to the module
name. So require('pgfplots.lua') looks for the file pgfplots.lua.lua,
which then fails.
Strictly speaking, require("...") searches for both filename.lua and
filename.so.
require("pgfplots.lua") searchs for the file "pgfplots/lua.lua" and
"pgfplots/lua.so"
There was a discussion [0] on the ConTeXt list in which Aditya mentions [1],
that dofile('pgfplots.lua') may be the right function in this situtation.
I looked into it more, and I think that the original patch my Thomas,
changing require"pgfplots.lua") to require("pgfplots"), is the only method
that will work with both LaTeX and ConTeXt.
I suggested dofile(...) because the standard approach in ConTeXt is to
load lua files using
dofile(resolvers.findfile("pgfplots.lua"))
However resolvers.findfiles is not a luatex function; rather it is a
function defined by ConTeXt data-res.lua and replaces kpse.find_all.
resolvers.findfiles caches the result and offers some logging abilities.
Since ConTeXt provides its own library for searching and loading files, it
disables the kpse library (it is debatable whether disabling core luatex
features is good idea or not, but that is OT here). So, the natural
option:
dofile(kpse.find_all("pgfplots.lua"))
will work in LaTeX but fail in ConTeXt.
On the other hand, require("pgfplots") will work both in LaTeX and
ConTeXt.
Aditya
PS: I haven't tested the LaTeX part yet, because my distro's TL package
does not have pgfplots.lua as part of the pgfplots package.------------------------------------------------------------------------------
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