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%D \module
%D [ file=page-sel, % moved from page-imp
%D version=1998.01.15,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Page Selection,
%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 code relates to old texexec features and one can wonder if it needs
%D to be in the core. So, this could become runtime loaded code. Some of
%D the alternatives need checking.
\writestatus{loading}{ConTeXt Page Macros / Page Selection}
\unprotect
%D One can (mis)use this mechanism to (re)arrange pages of already produced
%D files.
%D
%D \starttyping
%D \insertpages[file.pdf][1,3][n=30,width=18cm]
%D \stoptyping
%D
%D The pages are inserted in the text area, and even pages are repositioned
%D according to the width. In this example empty pages are added after page
%D 1 and 3.
%D
%D Selecting pages can be accomplished by:
%D
%D \starttyping
%D \filterpages[file.pdf][1,3,5][n=30,width=18cm]
%D \stoptyping
%D
%D One may pass \type {odd} or \type {even} instead of a comma separated list. A
%D third alternative is:
%D
%D \starttyping
%D \copypages[file.pdf][n=30,scale=950]
%D \stoptyping
%D
%D This macros inserts the page, according to the settings provided.
%D Beware: width is not the width of the image, but height can be used to control
%D its dimensions.
\installcorenamespace{withpages}
\installsetuponlycommandhandler \??withpages {withpages}
% \installdirectcommandhandler \??withpages {withpages}
\newcount\c_page_selectors_n
\unexpanded\def\insertpages
{\dotripleempty\page_selectors_insert}
\def\page_selectors_insert[#filename][#emptylist][#settings]%
{\doifelseassignment{#emptylist}
{\page_selectors_insert_indeed[#filename][][#emptylist]}
{\page_selectors_insert_indeed[#filename][#emptylist][#settings]}}
\def\page_selectors_insert_indeed[#filename][#emptylist][#settings]%
{\bgroup
\dontcomplain
\getfiguredimensions[#filename]%
\setupcurrentwithpages[\c!width=\zeropoint,\c!n=\noffigurepages,#settings]%
\global\c_page_selectors_n\directwithpagesparameter\c!n\relax
\scratchwidth\directwithpagesparameter\c!width\relax
\doifinset0{#emptylist}
{\emptyhbox\page}%
\dorecurse\c_page_selectors_n
{\page_selectors_filter_a_page{#filename}\recurselevel
\doifinset\recurselevel{#emptylist}
{\emptyhbox\page}}%
\egroup}
\unexpanded\def\filterpages
{\dotripleempty\page_selectors_filter}
\def\page_selectors_filter[#filename][#selection][#settings]% % \noffigurepages not yet supported
{\bgroup
\dontcomplain
\getfiguredimensions[#filename]%
\setupcurrentwithpages[\c!width=\zeropoint,\c!n=\noffigurepages,#settings]%
\global\c_page_selectors_n\directwithpagesparameter\c!n\relax
\scratchwidth\directwithpagesparameter\c!width\relax
\edef\p_selection{#selection}%
\ifx\p_selection\v!even
\dorecurse\c_page_selectors_n
{\ifodd\recurselevel\else
\page_selectors_filter_a_page{#filename}\recurselevel
\fi}%
\else\ifx\p_selection\v!odd
\dorecurse\c_page_selectors_n
{\ifodd\recurselevel\relax
\page_selectors_filter_a_page{#filename}\recurselevel
\fi}%
\else
\def\page_selectors_filter_step_indeed#page%
{\ifnum#page>\c_page_selectors_n\else
\page_selectors_filter_a_page{#filename}{#page}%
\fi}%
\def\page_selectors_filter_step#step%
{\dowithrange{#step}\page_selectors_filter_step_indeed}%
\processcommacommand[\p_selection]\page_selectors_filter_step
\fi\fi
\egroup}
\def\page_selectors_filter_a_page#filename#page%
{\hpack to \textwidth
{\ifdim\scratchwidth>\zeropoint
\rightorleftpageaction{\scratchwidth\zeropoint}{\hfill}%
\fi
\setbox\scratchbox\hpack
{\hskip-\scratchwidth
\edef\p_category{\directwithpagesparameter\c!category}% \useexternalfigure[foo][width=\textwidth]
\ifx\p_category\empty
\externalfigure[#filename][\c!page=#page,\c!height=\textheight]%
\else
\externalfigure[#filename][\p_category][\c!page=#page]%
\fi
\hss}%
\wd\scratchbox\zeropoint
\box\scratchbox}
\page}
\unexpanded\def\copypages
{\dotripleempty\page_selectors_copy}
\def\page_selectors_copy[#filename][#settings][#figuresettings]%
{\bgroup
\getfiguredimensions[#filename]%
\setupcurrentwithpages[\c!marking=\v!off,\c!offset=\zeropoint,\c!n=\noffigurepages,#settings]%
\global\c_page_selectors_n\directwithpagesparameter\c!n\relax
\scratchoffset\directwithpagesparameter\c!offset\relax
\dorecurse\c_page_selectors_n
{\vbox to \textheight
{\hsize\textwidth
\centeredbox
{\doifelse{\directwithpagesparameter\c!marking}\v!on\cuthbox\hpack % only place where cuthbox is used
{\ifdim\scratchoffset>\zeropoint\relax
\advance\vsize -2\scratchoffset
\advance\hsize -2\scratchoffset
\externalfigure[#filename][\c!page=\recurselevel,#figuresettings,\c!scale=,\c!factor=\v!max,\c!offset=\v!overlay]%
\else
\externalfigure[#filename][\c!page=\recurselevel,#figuresettings,\c!offset=\v!overlay]%
\fi}}}
\page}
\egroup}
%D \macros
%D {combinepages}
%D
%D Yet another way of postprocessing is handles by \type {\combinepages}. This macro
%D builds a matrix of pages from a file, for example:
%D
%D \starttyping
%D \setuppapersize
%D [A4][A4] % or [A4,landscape][A4,landscape]
%D
%D \setuplayout
%D [header=0pt,footer=1cm,
%D backspace=1cm,topspace=1cm,
%D width=middle,height=middle]
%D
%D \setupfootertexts
%D [presentation---\currentdate\space---\space\pagenumber]
%D
%D \starttext
%D \combinepages[slides][nx=2,ny=3,frame=on]
%D \stoptext
%D \stoptyping
%D
%D One can influence the way the pages are combined. (This will be explained some
%D time.)
\installcorenamespace{combinepagesalternative}
\unexpanded\def\combinepages
{\dodoubleempty\page_selectors_combine}
\def\page_selectors_combine[#filename][#settings]% a=perpag b=free
{\bgroup
\dontcomplain
\getfiguredimensions[#filename]%
\setupcurrentwithpages
[\c!alternative=\v!a,
\c!n=\noffigurepages,\c!nx=\plustwo,\c!ny=\plustwo,
\c!start=\plusone,\c!stop=\maxcard,
\c!distance=\bodyfontsize,
\c!bottom=\vfill,\c!top=\vss,\c!left=\hss,\c!right=\hss,
\c!before=\page,\c!after=\page,\c!inbetween=\blank,
\c!frame=,\c!background=,\c!backgroundcolor=,
\c!name={#filename},
#settings]%
\global\c_page_selectors_n\directwithpagesparameter\c!n\relax
\directwithpagesparameter\c!before
\scratchnx\directwithpagesparameter\c!nx
\scratchny\directwithpagesparameter\c!ny
\scratchdistance\directwithpagesparameter\c!distance\relax
\scratchwidth\dimexpr(\textwidth-\scratchnx\scratchdistance+\scratchdistance)/\scratchnx\relax
\scratchheight\dimexpr(\textheight-\scratchny\scratchdistance+\scratchdistance)/\scratchny\relax
\expandnamespaceparameter\??combinepagesalternative\directwithpagesparameter\c!alternative\v!b
\directwithpagesparameter\c!after
\egroup}
\setvalue{\??combinepagesalternative\v!a}% use hpacks
{\global\combinedpagescounter\directwithpagesparameter\c!start\relax
\doloop
{\vbox to \textheight
{\dorecurse\scratchny
{\hbox to \textwidth
{\dorecurse\scratchnx
{\vbox to \scratchheight
{\hsize\scratchwidth
\vsize\scratchheight
\directwithpagesparameter\c!top
\hbox to \hsize
{\directwithpagesparameter\c!left
\ifnum\combinedpagescounter>\directwithpagesparameter\c!stop\relax
\global\c_page_selectors_n\zerocount
\else\ifnum\combinedpagescounter>\c_page_selectors_n \else
\externalfigure
[\directwithpagesparameter\c!name]
[\c!object=\v!no,
\c!page=\number\combinedpagescounter,
\c!factor=\v!max,
\c!background=\directwithpagesparameter\c!background,
\c!backgroundcolor=\directwithpagesparameter\c!backgroundcolor,
\c!frame=\directwithpagesparameter\c!frame]%
\fi\fi
\directwithpagesparameter\c!right}
\directwithpagesparameter\c!bottom}%
\global\advance\combinedpagescounter\plusone
\hfil}%
\hfilneg}
\vfil}%
\vfilneg}%
\page
\ifnum\combinedpagescounter>\c_page_selectors_n
\exitloop
\fi}}
\setvalue{\??combinepagesalternative\v!c}%
{\global\combinedpagescounter\directwithpagesparameter\c!start\relax
\doloop
{\vbox to \textheight
{\hbox to \textwidth
{\dorecurse\scratchnx
{\directwithpagesparameter\c!left
\vbox to \textheight
{\hsize\scratchwidth
\dorecurse\scratchny
{\directwithpagesparameter\c!top
\hbox to \hsize
{\vbox to \scratchheight
{\hsize\scratchwidth
\vsize\scratchheight
\ifnum\combinedpagescounter>\directwithpagesparameter\c!stop\relax
\global\c_page_selectors_n\zerocount
\else\ifnum\combinedpagescounter>\c_page_selectors_n \else
\externalfigure
[\directwithpagesparameter\c!name]
[\c!object=\v!no,
\c!page=\number\combinedpagescounter,
\c!factor=\v!max,
\c!background=\directwithpagesparameter\c!background,
\c!backgroundcolor=\directwithpagesparameter\c!backgroundcolor,
\c!frame=\directwithpagesparameter\c!frame]%
\fi\fi}}
\global\advance\combinedpagescounter\plusone
\directwithpagesparameter\c!bottom}}%
\hfil}%
\hfilneg}}%
\page
\ifnum\combinedpagescounter>\c_page_selectors_n
\exitloop
\fi}}
\expandafter\let\csname\??combinepagesalternative\v!horizontal\expandafter\endcsname\csname\??combinepagesalternative\v!a\endcsname
\expandafter\let\csname\??combinepagesalternative\v!vertical \expandafter\endcsname\csname\??combinepagesalternative\v!c\endcsname
\setvalue{\??combinepagesalternative\v!b}%
{\global\combinedpagescounter\directwithpagesparameter\c!start\relax
\doloop
{\startbaselinecorrection
\hbox to \textwidth
{\dorecurse\scratchnx
{\global\advance\combinedpagescounter\plusone
\ifnum\combinedpagescounter>\c_page_selectors_n \else
\normalexpanded{\externalfigure
[\directwithpagesparameter\c!name]
[\c!page=\number\combinedpagescounter,
\c!width=\the\scratchwidth,
\c!background=\directwithpagesparameter\c!background,
\c!backgroundcolor=\directwithpagesparameter\c!backgroundcolor,
\c!frame=\directwithpagesparameter\c!frame]}%
\hfill
\fi}%
\hfillneg}%
\stopbaselinecorrection
\ifnum\combinedpagescounter<\c_page_selectors_n\relax
\directwithpagesparameter\c!inbetween
\else
\exitloop
\fi}}
% This macro cuts a page into n parts that can be pasted together.
\unexpanded\def\slicepages
{\dotripleempty\page_selectors_slice}
\def\page_selectors_slice[#filename][#oddsettings][#evensettings]%
{\ifthirdargument
\page_selectors_slice_indeed[#filename][#oddsettings][#evensettings]%
\else
\page_selectors_slice_indeed[#filename][#oddsettings][#oddsettings]%
\fi}
\let\slicedpagenumber\!!zerocount
\let\slicedpagestepx \!!zerocount
\let\slicedpagestepy \!!zerocount
\def\page_selectors_slice_indeed[#filename][#oddsettings][#evensettings]%
{\bgroup
\dontcomplain
\global\let\slicedpagenumber\!!zerocount
\getfiguredimensions[#filename]%
\setupcurrentwithpages
[\c!offset=\zeropoint,\c!hoffset=\zeropoint,\c!voffset=\zeropoint,
\c!width=\figurewidth,\c!height=\figureheight,\c!n=\noffigurepages,#oddsettings]%
\global\c_page_selectors_n\directwithpagesparameter\c!n\relax
\ifnum\c_page_selectors_n>\zerocount
\definepapersize
[\s!dummy][\c!height=\directwithpagesparameter\c!height,\c!width=\directwithpagesparameter\c!width]%
\setuppapersize
[\s!dummy][\s!dummy]%
\setuplayout
[\c!backspace=\zeropoint,\c!topspace=\zeropoint,
\c!height=\v!middle,\c!width=\v!middle,
\c!textdistance=\zeropoint,
\c!header=\zeropoint,\c!footer=\zeropoint]%
\fi
\dorecurse\noffigurepages
{\global\let\slicedpagenumber\recurselevel
\ifnum\c_page_selectors_n>\plusone
\dorecurse\c_page_selectors_n
{\let\slicedpagestepx\recurselevel
\dorecurse\c_page_selectors_n
{\let\slicedpagestepy\recurselevel
\clip
[\c!nx=\c_page_selectors_n,\c!ny=\c_page_selectors_n,\c!x=\slicedpagestepx,\c!y=\slicedpagestepy]
{\scale
[\c!scale=\number\c_page_selectors_n000]
{\externalfigure[#filename][\c!page=\slicedpagenumber]}}%
\page}}%
\else
\ifodd\slicedpagenumber\relax
\setupcurrentwithpages[#oddsettings]%
\else
\setupcurrentwithpages[#evensettings]%
\fi
\hskip\directwithpagesparameter\c!offset\relax
\clip
[\c!hoffset=\directwithpagesparameter\c!hoffset,\c!voffset=\directwithpagesparameter\c!voffset,
\c!height=\directwithpagesparameter\c!height,\c!width=\directwithpagesparameter\c!width]
{\externalfigure[#filename][\c!page=\slicedpagenumber]}%
\page
\fi}
\egroup}
% \starttext \slicepages[slice1.pdf][n=3] \stoptext
\unexpanded\def\trimpages[#1]% was for a over decade in p-pdf-51.tex
{\begingroup
\getdummyparameters
[\c!file=dummy,
\c!hoffset=\zeropoint,
\c!voffset=\zeropoint,
\c!width=17cm,
\c!height=24cm,
\c!x=\zeropoint,
\c!y=\zeropoint,
#1]
\getfiguredimensions
[\dummyparameter\c!file]
[\c!object=\v!no]
\dorecurse\noffigurepages
{\scale
[\c!width=\paperwidth,
\c!height=\paperheight]
{\offset
[\c!x=\dummyparameter\c!x,
\c!y=\dummyparameter\c!y]
{\clip
[\c!hoffset=\dummyparameter\c!hoffset,
\c!voffset=\dummyparameter\c!voffset,
\c!width=\dummyparameter\c!width,
\c!height=\dummyparameter\c!height]
{% we correct by default, if not needed, introduce option
\setbox\nextbox\hbox
{\externalfigure[\dummyparameter\c!file][\c!page=##1]}%
\ifdim\wd\nextbox>\ht\nextbox
\rotate[\c!rotation=90]{\box\nextbox}%
\else
\box\nextbox
\fi}}}}%
\endgroup}
\protect \endinput
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