[luatex] Using luarepl with lualatex - how do I get lua5.1's behavior for "require"?

[Eduardo Ochs]

Hi list,

I am trying to use luarepl with LuaLaTeX, but I am stuck at what seems
to be a standard problem, and I can't figure out from these docs (I'm
on Debian)

  /usr/share/doc/texlive-luatex/luatex/luatexbase/luatexbase-loader.pdf
  /usr/share/doc/texlive-luatex/luatex/luatexbase/luatexbase-modutils.pdf

how to make LuaLaTeX's "require" behave as the one in standard Lua
5.1... Here is a self-contained test.

--snip--snip--

# Download luarepl-0.5 and untar it into /tmp/lua-repl-0.5/
cd /tmp/
wget https://github.com/hoelzro/lua-repl/archive/0.5.tar.gz
tar -C /tmp/ -xvzf /tmp/0.5.tar.gz

# Create /tmp/myrepl.lua
cat > /tmp/myrepl.lua <<'%%%'
repldir      = "/tmp/lua-repl-0.5/"
package.path = ""
package.path = repldir.."?/init.lua;"..package.path
package.path = repldir.."?.lua;"     ..package.path
repl         = require "repl"
sync         = require "repl.sync"
function sync:showprompt(p) io.write(p == ">" and ">>> " or ">>>> ") end
function sync:lines() return io.stdin:lines() end
function sync:displayerror(err) print(err) end
function sync:displayresults(results)
    if results.n == 0 then return end
    print(unpack(results, 1, results.n))
  end
sync:run()
%%%

# Create /tmp/myrepl.tex
cat > /tmp/myrepl.tex <<'%%%'
\documentclass{book}
\begin{document}
\directlua{dofile "myrepl.lua"}
\end{document}
%%%

--snip--snip--



Now if we run "export LUA_INIT=; lua5.1 /tmp/myrepl.lua" everything
works, and we get luarepl's prompt, which is ">>> ". Note that I am
using "export LUA_INIT=" and "package.path = ''"; this is just to make
the behavior of the test more predictable.

However, if I run "cd /tmp/; lulatext myrepl.tex" it fails with:

  This is LuaTeX, Version beta-0.70.2-2012070301 (TeX Live 2012/Debian)
   restricted \write18 enabled.
  (./myrepl.tex
  LaTeX2e <2011/06/27>
  LuaTeX adaptation of babel <v3.8m-luatex-1.5> and hyphenation patterns for
  english, dumylang, nohyphenation, loaded.
  (/usr/share/texlive/texmf-dist/tex/latex/base/book.cls
  Document Class: book 2007/10/19 v1.4h Standard LaTeX document class
  (/usr/share/texlive/texmf-dist/tex/latex/base/bk10.clo)) (./myrepl.aux)
  ! LuaTeX error myrepl.lua:5: module 'repl' not found:
          no field package.preload['repl']
          [kpse lua searcher] file not found: 'repl'
          [kpse C searcher] file not found: 'repl'
  stack traceback:
          [C]: in function 'require'
          myrepl.lua:5: in main chunk
          [C]: in function 'dofile'
          <\directlua >:1: in main chunk.
  l.3 \directlua{dofile "myrepl.lua"}

Help, please! =( Any pointers welcome...
Cheers,
  Eduardo Ochs
  http://angg.twu.net/