Add working dir / source path as template variable

[tstenner]

I've got almost the same problem as in #3431: I want to include the source file in the output document.

For context, I have included the following snippet:

$if(includesource)$
$for(sourcefile)$
\attachment[file=$sourcefile$,method=hidden] 
$endfor$
$endif$

This will include the source file as PDF attachment, but only with an absolute input file name (pandoc $PWD/test.md -t context -s -o test.pdf) or with context running from the same directory (pandoc test.md -t context -s -o test.tex; context test.tex), otherwise context will look for the file in the temporary pdf folder.

This could be solved either with a variable with the full paths (fullpathsourcefile?) or a variable with pandoc's current working directory (usable as \attachment[file=$pwd$/$sourcefile$,method=hidden]).

[tarleb]

As a workaround, one can set the pwd metadata field in a Lua filter:

function Meta (meta)
  -- set current working directory. Works on Mac and Linux; not sure about Windows.
  meta.pwd = os.getenv 'PWD'
  return meta
end

[agusmba]

If 'PWD' doesn't work in windows (I haven't checked) you could use 'CD'

[tstenner]

@tarleb That's an option, another idea I had was pandoc test.md -V pwd=$PWD -s -t context.

For most of my documents I have rather basic needs so panzer et al are overkill. This addition would make another common usecase doable without any addons and it complements the $sourcefile$ variable quite nicely. On the other hand, I can understand if it's found to be out of scope for plain pandoc.

[tarleb]

According to a StackOverflow answer, there is no easy, platform independent way to get the current working directory from within Lua. I've started work on a module to expose the relevant Haskell functions to Lua. This should also help with other common filter operations.

[mb21]

I've started work on a module to expose the relevant Haskell functions to Lua.

for reference: I guess, that's #5468