Re: [NTG-context] Pdf info with Lua/Ctx API

14 Aug 2017


      On 8/14/2017 1:08 PM, Procházka Lukáš Ing. wrote:
...
Hello,
is there a way how to get the following info from a PDF file via Lua/Ctx 
API?:
- first: number of pages of the PDF,
- next: for each page: get width, height and orientation 
(portrait/landscape) or rotation (+90,+ 180, +270 or so) of i-th page.
this probably has come up several times now, anyway


\getfiguredimensions[test.pdf]
\dorecurse {\noffigurepages} {
     \getfiguredimensions[test.pdf][page=#1]
     \figurenaturalwidth 
,\figurenaturalheight,\figureorientation,\figurerotation\par
}

in lua you can either use the img library (see luatex manual) or context 
helpers

         local data = figures.push("foo.pdf")
         figures.identify()
         figures.check()
         figures.pop()
	inspect(data)

i'll add:

function figures.getinfo(name,page)
     if type(name) == "string" then
         name = { name = name, page = page }
     end
     if name.name then
         local data = figures.push(name)
         figures.identify()
         figures.check()
         figures.pop()
         return data
     end
end

so that one can do

local n = "ms.pdf"
local d = figures.getinfo(n)

if d then
     for i=1,d.used.pages do
         local p = figures.getinfo(n,i)
         if p then
             local u = p.used
             print(u.width,u.height,u.orientation)
         end
     end
end

etc etc


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