passing buffer to lua functions

passing buffer to lua functions

[Olivier]

Dear all,

I'm trying to implement a very simple filter mechanism in lua like this:

\def\test#1{%
  \startlua
    local pipe, str
    pipe = io.popen("./my_filter '\luaescapestring{#1}'", "r")
    str = pipe:read("*a") 
    tex.print(str)
    pipe:close()
  \stoplua
}

\test{%
  line 1
  line 2
}

The issue I have is that the argument of test has its line breaks
removed in the process (i.e. the filter my_filter sees a single line
argument).  How to prevent this while keeping the lua escape at the same
time? (I know I can implement such a thing with executecommand and using
buffers written to files, but I would like to avoid writing on the hard disk.)

Olivier
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