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%D \module
%D   [       file=mtx-context-combine,
%D        version=2009.03.21,
%D          title=\CONTEXT\ Extra Trickry,
%D       subtitle=Combine Files,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright=\PRAGMA]
%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=combine [options] list-of-files
%
% --sort                   : sort filenames first
% --paperoffset=dimension  : left-top-offset
% --nobanner               : no footer etc
% --combination            : h*v or hxv
% --paperformat=spec       : paper*print or paperxprint
% --nobanner               : no footerlines
% --bannerheight=dimension : height of banner
% --bannerstring=dimension : height of bannerstring
%
% end help

\input mtx-context-common.tex

\doifdocumentargumentelse {paperoffset} {

    \setuplayout
      [topspace=\getdocumentargument{paperoffset},
       backspace=\getdocumentargument{paperoffset}]

} {

    \setuplayout
      [topspace=0pt,
       backspace=0pt]

}

\setuplayout
  [header=0pt,
   footer=0pt,
   width=middle,
   height=middle]

\setuppapersize
  [\getdocumentargument{paperformat_paper}]
  [\getdocumentargument{paperformat_print}]

\doifnotdocumentargument {bannerheight} {
    \setuplayout
        [footer=1cm]
}

\doifelse {\getdocumentargument{nobanner}} {yes} {
    \setuplayout
      [footer=0cm]
    \setupbackgrounds
      [page]
      [background=]
} {
    \definelayer
      [page]
      [width=\paperwidth,
       height=\paperheight]

    \setupbackgrounds
      [page]
      [background=page]
}

\setupexternalfigures
  [directory=]

\starttext

\startluacode
    local format = string.format

    if #document.files > 0 then
        if document.arguments["sort"] then
            table.sort(document.files)
        end
        local dobanner = not document.arguments["nobanner"]
        local bannerheight = document.arguments["bannerheight"]
        local nx = document.arguments.combination_nx or 2
        local ny = document.arguments.combination_ny or 2
        for _, filename in ipairs(document.files) do
            if not string.find(filename,"^mtx%-context%-") then
                -- could be a macro
                local bannerstring = format("\\tttf\\detokenize{%s}\\quad\\quad\\currentdate\\quad\\quad\\pagenumber",file.basename(filename))
                if dobanner then
                    if bannerheight then
                        context("\\setuptexttexts[{\\setlayerframed[page][preset=middlebottom][frame=off,height=%s]{%s}}]",bannerheight,bannerstring)
                    else
                        context("\\setupfootertexts[{%s}]",bannerstring)
                    end
                end
                context("\\combinepages[%s][nx=%s,ny=%s]",filename,nx,ny)
                context("\\page")
            end
        end
    else
        context("no files given")
    end
\stopluacode

\stoptext