Re: [NTG-context] problem with package.path

8 May 2010

      Hans Hagen wrote:
...
On 7-5-2010 10:52, Taco Hoekwater wrote:
...
Peter Münster wrote:
...
On Thu, May 06 2010, Hans Hagen wrote:
...
...
\startbuffer[test]
bla = nil
\stopbuffer
\savebuffer[test][../mytest.lua]
\starttext
\startluacode
package.path = "../?.lua;;"
require("mytest")
\stopluacode
\stoptext
dofile "../mytest.lua"
Bad example...
mytest.lua is a module, so it must be loaded with require:
You cannot always replace 'require' with 'dofile', and for
this reason it is important that package.path actually works
as explained in the lua manual. (escrito had similar problems,
and other external lua modules will run into it as well).
well, package path is supported (as is cpath) so it's more a question of 
why that paths fails .. maybe we need to explicitly assume ";" instead 
of the platform separator (tests on my machine work ok as windows has ; 
as separator)
you can test this with adding an explcit ";" to
libpaths = file.split_path(_path_,";")
in data-lua.lua
For me on linux, this change should make it work (package.path indeed
contains semicolons). However, require() is still broken:

! LuaTeX error /opt/tex/texmf-local/tex/context/base/l-file.lua:133: bad 
argument #1 to 'gsub' (string expected, got nil)
stack traceback:
         [C]: in function 'gsub'
         /opt/tex/texmf-local/tex/context/base/l-file.lua:133: in 
function 'split_path'
         /opt/tex/texmf-local/tex/context/base/data-lua.lua:36: in 
function 'clibpaths'
         /opt/tex/texmf-local/tex/context/base/data-lua.lua:97: in 
function 
         [C]: in function 'require'
         <main ctx instance>:2: in main chunk.
}inserted text> ...equire('testmodule') -- fails

\dodostartluacode ...d \directlua \zerocount {#1}}

l.5 \stopluacode

Test files are attached. The definition of package.libpaths I used:

   function package.libpaths()
     print (_path_, package.path)
     if not _path_ or package.path ~= _path_ then
         _path_ = package.path
         libpaths = file.split_path(_path_,';')
         print (table.serialize(libpaths))
     end
     return libpaths
   end

And it prints out:

nil 
./?.lua;/usr/local/share/lua/5.1/?.lua;/usr/local/share/lua/5.1/?/init.lua;/usr/local/lib/lua/5.1/?.lua;/usr/local/lib/lua/5.1/?/init.lua
t={
  "./?.lua",
  "/usr/local/share/lua/5.1/?.lua",
  "/usr/local/share/lua/5.1/?/init.lua",
  "/usr/local/lib/lua/5.1/?.lua",
  "/usr/local/lib/lua/5.1/?/init.lua",
}

But it looks like mkiv is not happy with the split path, as it goes
on trying clibpaths().

Also, I ran into another problem: if the module has the same name as the
base input file, package.libpaths is not called at all (initially the
module was called 'tryme.lua').

Best wishes,
Taco

module 'testmodule'

return {}