Re: Extract media from different .docx files to same directory

[EBkysko <ebkysko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I hoped "--id-prefix" would work, but no go, it only works for footnotes.

Here's a *crude* solution as a Lua filter to prefix the images with the md 
output file name (I used "--extract-media" option in my tests) :

----------
local outputfile = PANDOC_STATE.output_file:gsub("%.md", "")

local function prefixName(s)
  return s:gsub("([^/]*)$", outputfile .. "_%1")
end

function Image(img)
  img.src = prefixName(img.src)
  return img
end

function Pandoc(doc)
  for fp, mt, contents in pandoc.mediabag.items() do
    local fpnew = prefixName(fp)
    pandoc.mediabag.insert(fpnew, mt, contents)
    pandoc.mediabag.delete(fp)
  end
end
----------

I thought changing the mediabag files names would suffice, but I also 
needed to make change in Image.
You could use something else for the prefix (eg sha1 hashes of image 
content, which would avoid duplicates under different names).
Maybe one could simple do a file rename in the mediabag, instead of 
creating a new one and deleting old one.
As I said, it's crude. Maybe I missed a simpler solution.

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