Format program listings for Markdown

pbook in sed

sed -E -e 's/^/    /g' -e 's/^    --- ?//g' | pandoc -o listing.pdf -

That expression is a cheap literate programming system for Markdown.
Start commentary lines with '--- ' and they will be
markdown-formatted, the rest will be code. (Uses Lua comment syntax.)

Finally the right implementation of this idea:
  http://fresh.homeunix.net/~luke/misc/emacs/pbook.pdf (program)
  http://fresh.homeunix.net/~luke/misc/erlang/regtest.pdf (better example)

EXAMPLE INPUT:

--- ## Linux glue
---
--- To take direct control of a PCI device on Linux requires a little
--- setup. This is facilitated by the sysfs (`/sys`) filesystem which
--- supports finding devices, checking their type, forcing kernel
--- drivers to unbind them, and other handy things. (sysfs is one great
--- Linux feature.)

function pcidev_is_82574 (device)
   return io.open(path(device,"config"), "ro"):read(4) == "\x86\x80\xd3\x10"
end

EXAMPLE OUTPUT:

## Linux glue

To take direct control of a PCI device on Linux requires a little
setup. This is facilitated by the sysfs (`/sys`) filesystem which
supports finding devices, checking their type, forcing kernel
drivers to unbind them, and other handy things. (sysfs is one great
Linux feature.)
    
    function pcidev_is_82574 (device)
       return io.open(path(device,"config"), "ro"):read(4) == "\x86\x80\xd3\x10"
    end