One sentece per line

sentence.lua

local function sentence_lines (el)
  local inlines = el.content
  for i = 2, #inlines do
    if inlines[i].t == 'Space' and
       inlines[i-1].t == 'Str' and
       inlines[i-1].text:match '%.$' then
      inlines[i] = pandoc.SoftBreak()
    end
  end
  return el
end

return {
  {SoftBreak = function () return pandoc.Space() end},
  {Para = sentence_lines},
  {Plain = sentence_lines},
}

@bpj Yes of course with the much more aggressive approach to not leave sentences on the table there will be false positives (I know I'll have to tackle some abbreviation issues at some point), but with the original I was getting hundreds of paragraphs in a book that hand 2-10 sentences not split up. I'll definitely be looking into lpeg.utfR because better locale dependent case detection will be important.

@tarleb Yes definitely I had that in mind already, but at the moment I'm going to be rolling it out to a few dozen book projects in two languages over the next few weeks/month and it will be easier to iterate on in conjunction with other normalization stuff I use, but when it gets a little more mature and can move at it's own pace it definitely should land in it's own project.