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% engine=luatex

%D \module
%D   [       file=mtx-context-select,
%D        version=2008.11.10, % about that time i started playing with this
%D          title=\CONTEXT\ Extra Trickry,
%D       subtitle=Selecting Files,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D This is a \TEXEXEC\ features that has been moved to \MKIV.

% begin help
%
% usage: context --extra=select [options] list-of-files
%
% --sort                : sort filenames first
% --topspace=dimension  : distance above first line
% --backspace=dimension : distance before left margin
% --selection=list      : n:m,p:q,...
% --paperformat=spec    : paper*print or paperxprint or 'fit'
% --interaction         : add hyperlinks
%
% end help

\input mtx-context-common.tex

\setuppapersize
  [\getdocumentargumentdefault{paperformat_from}{A4}]
  [\getdocumentargumentdefault{paperformat_to}{A4}]

\setuppaper
  [offset=\getdocumentargumentdefault{paperformat_to}{0pt}]

\setuplayout
  [width=middle,
   height=middle,
   topspace=\getdocumentargumentdefault{topspace}{0pt},
   backspace=\getdocumentargumentdefault{backspace}{0pt},
   location=middle,
   header=0pt,
   footer=0pt]

\doif {\getdocumentargument{marking}} {yes} {
    \setuplayout
      [marking=on]
}

\doif {\getdocumentargument{interaction}} {yes} {
    \setupinteraction
      [state=start]
    \setupexternalfigures
      [interaction=yes]
}

\setupexternalfigures
  [directory=]

\doifelse {\getdocumentargument{paperformat_paper}} {fit} {
    \doifdocumentfilename {1} {
        \getfiguredimensions
          [\getdocumentfilename{1}]
        \definepapersize
          [fit]
          [width=\figurewidth,
           height=\figureheight]
        \setuppapersize
          [fit]
          [fit]
    }
}

\starttext

\startluacode

    local papersize = document.arguments.paperformat_paper or "A4"
    local printsize = document.arguments.paperformat_print or "A4"
    local selection = document.arguments.selection         or ""
    local textwidth = document.arguments.textwidth         or "0cm" -- needed ?

    if #document.files == 0 then
        context("no files given")
    elseif selection == "" then
        context("no selection given")
    else
        if document.arguments.sort then
            table.sort(document.files)
        end
        for _, filename in ipairs(document.files) do
            if not string.find(filename,"^mtx%-context%-") then
                logs.report("select",filename)
                context.filterpages (
                    { filename },
                    { selection },
                    { width = textwidth }
                )
            end
        end
    end

\stopluacode

\stoptext