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+%D \module
+%D [ file=page-pcl,
+%D version=2017.11.08,
+%D title=\CONTEXT\ Page Macros,
+%D subtitle=Page Columns,
+%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.
+
+\writestatus{loading}{ConTeXt Page Macros / Page Columns}
+
+%D This is very experimental code! We took a bit from the mixed columns and single
+%D column page code. This one works acceptable with floats and is for whole double
+%D column documents. We don't balance (yet). Footnotes are per column. One can have
+%D side floats too. No balancing and other fancy features.
+%D
+%D Don't use this in production! Although the main approach will stay there might be
+%D changes in the way floats are dealt with. Not much testing has been done but as
+%D we stay close to the single column mode we expect most to just work. Only floats
+%D are the (usual) pain. Backgrounds, line numbering, etc.\ not tested either.
+
+\unprotect
+
+\definemeasure[onecolumn] [\columnwidth]
+\definemeasure[twocolumns] [\dimexpr\plustwo \columnwidth+ \columndistance\relax]
+\definemeasure[threecolumns][\dimexpr\plusthree\columnwidth+\plustwo \columndistance\relax]
+\definemeasure[fourcolumns] [\dimexpr\plusfour \columnwidth+\plusthree\columndistance\relax]
+
+\newcount\c_page_col_n_of_columns \c_page_col_n_of_columns\plusone
+\newcount\c_page_col_current \c_page_col_current \plusone
+\newdimen\d_page_col_distance
+\newdimen\d_page_col_max_height
+\newdimen\d_page_col_max_width
+%newdimen\d_page_col_balance_step
+\newdimen\d_page_col_column_width
+
+\newdimen\d_page_col_top_height
+\newdimen\d_page_col_top_width
+
+\newdimen\d_page_col_available
+\newdimen\d_page_col_sofar
+
+%D We need to step over empty columns.
+
+\unexpanded\def\page_col_command_next_page
+ {\page_col_eject_page}
+
+\unexpanded\def\page_col_column
+ {\page_otr_eject_page}
+
+\unexpanded\def\page_col_eject_page
+ {\begingroup
+ \scratchcountertwo \realpageno
+ \page_otr_eject_page
+ \scratchcounterone \c_page_col_current
+ \scratchcounterthree\zerocount
+ \doloop{%
+ \ifnum\scratchcounterthree>\plushundred
+ % too many attempts
+ \exitloop
+ \else\ifnum\realpageno>\scratchcountertwo
+ % we advanced at least one page so we're done
+ \exitloop
+ \else
+ \ifnum\scratchcounterone=\c_page_col_current
+ \dontleavehmode\null
+ \fi
+ \page_otr_eject_page
+ \scratchcounterone\c_page_col_current
+ \advance\scratchcounterthree\plusone
+ \fi\fi
+ }%
+ \endgroup}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_next_page_and_inserts
+ {\page_otr_eject_page_and_flush_inserts}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_set_hsize
+ {\global\hsize\d_page_col_column_width\relax
+ \global\d_page_col_available\dimexpr
+ \numexpr\c_page_col_n_of_columns-\c_page_col_current+\plusone\relax\d_page_col_column_width
+ + \numexpr\c_page_col_n_of_columns-\c_page_col_current \relax\d_page_col_distance
+ \relax
+ \global\d_page_col_sofar
+ \ifnum\c_page_col_n_of_columns=\plusone
+ \zeropoint
+ \else
+ \numexpr\c_page_col_n_of_columns-\plusone\relax
+ \dimexpr\d_page_col_column_width+\d_page_col_distance\relax
+ \fi}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_set_vsize % \page_one_command_set_vsize minus the pagegoal setting
+ {\ifgridsnapping
+ \ifcase\layoutlines
+ \getrawnoflines\textheight
+ \else
+ \noflines\layoutlines
+ \fi
+ \global\vsize\noflines\openlineheight
+ \else
+ \global\vsize\textheight
+ \fi}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_package_contents#1#2% \box<n> \unvbox<n> % this one will be redone (checked)
+ {\bgroup
+ \setbox\b_page_one_contents\vbox to \textheight
+ {\page_one_registered_text_area_a#1#2}%
+ \page_one_command_package_show_state
+ \ht\b_page_one_contents\textheight
+ \page_one_registered_text_area_b
+ {\box\b_page_one_contents}%
+ \egroup}
+
+\unexpanded\def\page_col_command_package_contents_one#1#2% \box<n> \unvbox<n> % this one will be redone (checked)
+ {\bgroup
+ \forgetall
+ % see one for comments as it is similar
+ \strc_notes_check_if_bottom_present
+ \d_page_one_natural_depth\dp#2\relax
+ \setbox\b_page_one_contents\vbox to \textheight
+ {\page_col_command_flush_top_insertions
+ \page_one_registered_text_area_a#1#2%
+ \hsize\d_page_col_column_width
+ \ifgridsnapping
+ \vskip\dimexpr\openstrutdepth-\d_page_one_natural_depth\relax
+ \prevdepth\openstrutdepth
+ \page_col_command_flush_bottom_insertions
+ \vfil
+ \else\ifcase\bottomraggednessmode
+ % ragged (default)
+ \vskip\dimexpr\openstrutdepth-\d_page_one_natural_depth\relax
+ \prevdepth\openstrutdepth
+ \page_col_command_flush_bottom_insertions
+ \vfil
+ \or
+ % align (normal)
+ \page_col_command_flush_bottom_insertions
+ \or
+ % baseline
+ \kern\dimexpr\maxdepth-\d_page_one_natural_depth\relax
+ \page_col_command_flush_bottom_insertions
+ \fi\fi
+ \fakepagenotes}%
+ \page_one_command_package_show_state
+ \ifconditional\c_notes_bottom_present
+ \ifgridsnapping
+ \ifcase\layoutlines
+ \getrawnoflines\textheight
+ \else
+ \noflines\layoutlines
+ \fi
+ \scratchoffset\dimexpr\numexpr\noflines-\plusone\relax\lineheight+\topskip\relax
+ \else
+ \scratchoffset\ht\b_page_one_contents
+ \fi
+ \setbox\b_page_one_bottom_notes\hpack
+ {\checksinglecolumnfootnotes % ?
+ \hsize\d_page_col_column_width
+ \setupnotes[\c!width=\textwidth]%
+ \lower\scratchoffset\vbox{\placebottomnotes\par\kern\zeropoint}}%
+ \ht\b_page_one_contents \zeropoint
+ \wd\b_page_one_contents \zeropoint
+ \ht\b_page_one_bottom_notes\zeropoint
+ \wd\b_page_one_bottom_notes\zeropoint
+ \wd\b_page_one_bottom_notes\d_page_col_column_width
+ \page_one_registered_text_area_b
+ {\vpack to \textheight
+ {\hbox{\box\b_page_one_contents\box\b_page_one_bottom_notes}}}%
+ \else
+ \ht\b_page_one_contents\textheight
+ \wd\b_page_one_contents\d_page_col_column_width
+ \page_one_registered_text_area_b
+ {\box\b_page_one_contents}%
+ \fi
+ \egroup}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_side_float_output
+ {% % %
+ \ifvoid\namedinsertionnumber\s!topfloat\else
+ \scratchwidth\wd\namedinsertionnumber\s!topfloat
+ \ifdim\scratchwidth>\d_page_col_top_width
+ \global\d_page_col_top_width \scratchwidth
+ \fi
+ \global\d_page_col_top_height\ht\namedinsertionnumber\s!topfloat
+ \fi
+ % % %
+ \setbox\scratchbox\vbox\bgroup
+ \page_col_command_package_contents_one\unvbox\normalpagebox
+ \egroup
+ \putboxincache\s!pagecolumn{\number\c_page_col_current}\scratchbox
+ \ifnum\c_page_col_current=\c_page_col_n_of_columns
+ \page_col_routine_package
+ \page_otr_construct_and_shipout\box\normalpagebox\plusone
+ \global\c_page_col_current\plusone
+ \global\d_page_col_top_height\zeropoint
+ \global\d_page_col_top_width\zeropoint
+ % \page_col_command_flush_top_insertions
+ % \page_col_command_flush_floats
+ \else
+ \ifdim\d_page_col_top_width>\zeropoint
+ \ifdim\dimexpr\d_page_col_top_width>\d_page_col_sofar\relax
+ \begingroup
+ \floatingpenalty\zerocount
+ \insert\namedinsertionnumber\s!topfloat\bgroup
+ \vbox to \d_page_col_top_height{\vss}
+ % can be an option
+ \page_col_command_flush_top_insertions
+ \page_col_command_flush_floats
+ % so far till option
+ \egroup
+ \endgroup
+ \fi
+ \fi
+ \global\advance\c_page_col_current\plusone
+ \fi
+ %
+ \page_col_command_set_vsize
+ \page_col_command_set_hsize}
+
+% use \currentmixedcolumns instead of \recurselevel
+
+\def\page_col_routine_package_step
+ {% needs packaging anyway
+ \getboxfromcache{\s!pagecolumn}{\number\recurselevel}\scratchbox
+ \page_lines_add_numbers_to_box\scratchbox\recurselevel\c_page_col_n_of_columns\plusone % new
+ \page_marks_synchronize_column\plusone\c_page_col_n_of_columns\recurselevel\scratchbox
+ % backgrounds
+ \anch_mark_column_box\scratchbox
+ \mixedcolumnseparatorheight\ht\scratchbox
+ \mixedcolumnseparatordepth \dp\scratchbox
+ \inheritedpagecolumnsframedbox\recurselevel\scratchbox}
+
+\def\page_col_routine_package
+ {\global\setbox\normalpagebox\hbox to \makeupwidth\bgroup
+ \edef\p_separator{\pagecolumnsparameter\c!separator}%
+ \pagecolumnseparatorwidth\d_page_col_distance
+ \edef\p_direction{\pagecolumnsparameter\c!direction}%
+ \ifx\p_direction\v!reverse
+ \dostepwiserecurse\c_page_col_n_of_columns\plusone\minusone
+ {\page_col_routine_package_step
+ \ifnum\recurselevel>\plusone
+ \page_col_routine_package_separate
+ \fi}%
+ \else
+ \dorecurse\c_page_col_n_of_columns
+ {\page_col_routine_package_step
+ \ifnum\recurselevel<\c_page_col_n_of_columns
+ \page_col_routine_package_separate
+ \fi}%
+ \fi
+ \egroup
+ \resetboxesincache{\s!pagecolumn}}
+
+%D \unknown
+
+% \unexpanded\def\page_col_command_check_if_float_fits
+% {\ifconditional\c_page_floats_not_permitted
+% \global\setfalse\c_page_floats_room
+% %\else\ifabsdim\dimexpr\d_page_col_available-\naturalfloatwd\relax<\onepoint
+% \else\ifdim\dimexpr\d_page_col_available-\naturalfloatwd\relax>-\onepoint
+% \global\settrue\c_page_floats_room
+% \else
+% \global\setfalse\c_page_floats_room
+% \fi\fi
+% \ifconditional\c_page_floats_room
+% \begingroup
+% \scratchdimen\dimexpr\pagetotal+\lineheight\relax
+% \ifdim\scratchdimen>\pagegoal
+% \goodbreak
+% \ifdim\dimexpr\d_page_col_available-\naturalfloatwd\relax>\onepoint
+% \global\setfalse\c_page_floats_room
+% \else
+% \global\settrue\c_page_floats_room
+% \fi
+% \fi
+% \endgroup
+% \fi
+% \ifconditional\c_page_floats_room
+% \ifdim\pagetotal>\zeropoint
+% \scratchdimenone\dimexpr\pagetotal+\floatheight+\d_strc_floats_top-\pageshrink\relax
+% \scratchdimentwo\pagegoal
+% \relax % needed
+% \ifcase\c_page_one_float_method
+% % method 0 : raw
+% \or
+% % method 1 : safe
+% \advance\scratchdimentwo -\strutdp
+% \or
+% % method 2 : tight
+% \advance\scratchdimenone -\onepoint
+% \fi
+% \relax % really needed ! ! ! !
+% \ifdim\scratchdimenone>\scratchdimentwo
+% \global\setfalse\c_page_floats_room
+% \fi
+% \fi
+% \ifconditional\c_page_floats_room
+% \global\setbox\floatbox\hpack to \d_page_col_available{\hss\box\floatbox\hss}%
+% \fi
+% \fi}
+
+\unexpanded\def\page_col_command_check_if_float_fits
+ {\ifconditional\c_page_floats_not_permitted
+ % forget about it anyway
+ \global\setfalse\c_page_floats_room
+ \else
+ % first we check the current column
+% \ifdim\dimexpr\d_page_col_width-\naturalfloatwd\relax>-\onepoint
+ \ifdim\dimexpr\hsize-\naturalfloatwd\relax>-\onepoint
+ \global\settrue\c_page_floats_room
+ \else
+ \global\setfalse\c_page_floats_room
+ \fi
+ \ifconditional\c_page_floats_room
+ % we fit in the column but do we have room
+ \ifdim\dimexpr\pagetotal+\lineheight\relax>\pagegoal
+ % try again later
+ \goodbreak
+ \fi
+ \ifdim\pagetotal>\zeropoint
+ \scratchdimenone\dimexpr\pagetotal+\floatheight+\d_strc_floats_top-\pageshrink\relax
+ \scratchdimentwo\pagegoal
+ \relax % needed
+ \ifcase\c_page_one_float_method
+ % method 0 : raw
+ \or
+ % method 1 : safe
+ \advance\scratchdimentwo -\strutdp
+ \or
+ % method 2 : tight
+ \advance\scratchdimenone -\onepoint
+ \fi
+ \relax % really needed ! ! ! !
+ \ifdim\scratchdimenone>\scratchdimentwo
+ % there is no room, give up
+ \global\setfalse\c_page_floats_room
+ % now we can decide on a top float
+% \fi
+ \else
+% \ifconditional\c_page_floats_room
+% \global\setbox\floatbox\hpack to \d_page_col_float_available{\hss\box\floatbox\hss}%
+% \fi
+ \fi
+ \fi
+ \fi
+ \fi}
+
+%D \unknown
+
+\def\page_col_set_float_pack_hsize
+ {\ifnum\c_page_col_current=\c_page_col_n_of_columns
+ \c_page_col_current\plusone
+ \else
+ \advance\c_page_col_current\plusone
+ \fi
+ \page_col_command_set_hsize
+ \hsize\d_page_col_available}
+
+\unexpanded\def\page_col_command_flush_floats
+ {\global\settrue\c_page_floats_flushing
+ \ifconditional\c_page_floats_some_waiting
+ \par
+ \page_col_set_float_pack_hsize
+ \page_col_command_flush_floats_indeed
+ \fi
+ \global\savednoffloats\zerocount
+ \global\setfalse\c_page_floats_some_waiting
+ \global\setfalse\c_page_floats_flushing}
+
+\def\page_floats_show_pack_state_indeed#1%
+ {\llap{\smash{\backgroundline[black]{\strut\smallinfofont\white#1\space\the\nofcollectedfloats\space of\space\the\savednoffloats:\the\hsize}}\hskip.25\emwidth}}
+
+\installtextracker
+ {floats.collecting}
+ {\let\page_floats_show_pack_state\page_floats_show_pack_state_indeed}
+ {\let\page_floats_show_pack_state\gobbleoneargument}
+
+\let\page_floats_show_pack_state\gobbleoneargument
+
+\def\page_col_command_flush_floats_indeed % much in common with OTRSET
+ {\ifconditional\c_page_floats_some_waiting
+ \ifconditional\c_page_floats_pack_flushed
+ \setfalse\c_page_floats_center_box % not needed as we do call directly
+ %
+ \page_floats_collect\s!text\hsize\emwidth
+ %
+ \ifnum\nofcollectedfloats=\plusone
+ \ifdim\naturalfloatwd>\hsize
+ \nofcollectedfloats\zerocount
+ \fi
+ \fi
+ \ifnum\nofcollectedfloats>\zerocount
+ \global\setbox\floatbox\hpack to \hsize
+ {\page_floats_show_pack_state F%
+ \hfil
+ \dorecurse\nofcollectedfloats
+ {\ifcase\columndirection % nog document wide
+ \page_floats_flush\s!text\plusone
+ \else
+ \page_floats_flush\s!text{\the\numexpr\nofcollectedfloats-\recurselevel+1\relax}%
+ \fi
+ % this could happen at the lua end instead
+ \scratchdimen\dimexpr\wd\floatbox-\naturalfloatwd\relax
+ \ifdim\scratchdimen<\zeropoint
+ \global\setbox\floatbox\hpack spread -\scratchdimen{\hss\box\floatbox\hss}%
+ \fi
+ %
+ \ifdim\wd\floatbox>\textwidth % \hsize
+ \hpack to \textwidth{\hss\box\floatbox\hss}% \textwidth
+ \else
+ \box\floatbox
+ \fi
+ \ifnum\recurselevel<\nofcollectedfloats
+ \hfil
+ \fi}%
+ \hfil}%
+ \doplacefloatbox
+ % \page_one_insert_top_float
+ \doubleexpandafter\page_col_command_flush_floats_indeed
+ \else
+ % todo
+ \fi
+ \else
+ \page_floats_get
+ % \page_one_insert_top_float
+ \doplacefloatbox
+ \doubleexpandafter\page_col_command_flush_floats_indeed
+ \fi
+ \fi}
+
+\unexpanded\def\page_col_command_flush_saved_floats % like one
+ {\global\d_page_floats_inserted_top\zeropoint
+ \global\d_page_floats_inserted_bottom\zeropoint
+ \ifconditional\c_page_floats_flushing \else
+ \page_col_command_set_top_insertions
+ \page_col_command_set_bottom_insertions
+ \ifconditional\c_page_floats_some_waiting
+ \doif{\rootfloatparameter\c!cache}\v!no\page_col_command_flush_floats % could be _otr_
+ \else\ifconditional\c_page_margin_blocks_present
+ \page_col_command_flush_floats
+ \fi\fi
+ \fi}
+
+\unexpanded\def\page_col_command_set_top_insertions
+ {\bgroup
+ \ifconditional\c_page_floats_some_waiting
+ \noffloatinserts\zerocount
+ \let\totaltopinserted\!!zeropoint
+ \page_col_set_float_pack_hsize
+ \page_col_command_set_top_insertions_indeed
+ \ifnum\rootfloatparameter\c!nbottom=\zerocount
+ \ifnum\rootfloatparameter\c!nlines>\zerocount
+ \ifdim\totaltopinserted>\zeropoint\relax
+ \ifdim\dimexpr\rootfloatparameter\c!nlines\lineheight+\totaltopinserted\relax>\textheight
+ \showmessage\m!floatblocks8{\rootfloatparameter\c!nlines}%
+ \page_otr_fill_and_eject_page % was tripple: vfilll
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \egroup}
+
+\def\d_page_col_collected_top_float_height % pseudo
+ {\dimexpr
+ \d_page_floats_inserted_top +
+ \maxcollectedfloatstotal +
+ \ifdim\d_strc_floats_top>\d_strc_floats_bottom
+ \d_strc_floats_top
+ \else
+ \d_strc_floats_bottom
+ \fi
+ \relax}
+
+\def\page_col_command_set_top_insertions_indeed
+ {\ifnum\noffloatinserts<\c_page_floats_n_of_top
+ \ifcase\savednoffloats
+ \let\page_col_command_set_top_insertions_indeed\relax
+ \else
+ \page_floats_collect\s!text\hsize\emwidth
+ \ifdim\d_page_col_collected_top_float_height<\textheight
+ \global\setbox\floatbox\hpack to \hsize
+ {\page_floats_show_pack_state T%
+ \hfil
+ \dorecurse\nofcollectedfloats
+ {\ifcase\columndirection % nog document wide
+ \page_floats_flush\s!text\plusone
+ \else
+ \page_floats_flush\s!text{\the\numexpr\nofcollectedfloats-\recurselevel+1\relax}%
+ \fi
+ % this could happen at the lua end instead
+ \scratchdimen\dimexpr\wd\floatbox-\naturalfloatwd\relax
+ \ifdim\scratchdimen<\zeropoint
+ \global\setbox\floatbox\hpack spread -\scratchdimen{\hss\box\floatbox\hss}%
+ \fi
+ %
+ \ifdim\wd\floatbox>\makeupwidth % \hsize
+ \hpack to \makeupwidth{\hss\box\floatbox\hss}%
+ \else
+ \box\floatbox
+ \fi
+ \ifnum\recurselevel<\nofcollectedfloats
+ \hfil
+ \fi}%
+ \hfil}%
+ \page_one_prepare_top_float
+ \xdef\totaltopinserted{\the\d_page_floats_inserted_top}%
+ \page_one_insert_top_float
+ \ifconditional\c_page_floats_some_waiting
+ \advance\noffloatinserts \plusone
+ \else
+ \noffloatinserts\c_page_floats_n_of_top\relax
+ \fi
+ \page_floats_report_flushed
+ \else
+ \let\page_col_command_set_top_insertions_indeed\relax
+ \fi
+ \fi
+ \else
+ \ifconditional\c_page_floats_some_waiting
+ \showmessage\m!floatblocks6{\the\c_page_floats_n_of_top}%
+ \fi
+ \let\page_col_command_set_top_insertions_indeed\relax
+ \fi
+ \page_col_command_set_top_insertions_indeed}
+
+\let\page_col_command_flush_top_insertions \page_one_command_flush_top_insertions
+\let\page_col_command_flush_bottom_insertions\page_one_command_flush_bottom_insertions
+
+%let\page_col_command_set_top_insertions \page_one_command_set_top_insertions
+\let\page_col_command_set_bottom_insertions \page_one_command_set_bottom_insertions
+
+%let\page_col_command_set_top_insertions_indeed \page_one_command_set_top_insertions
+\let\page_col_command_set_bottom_insertions_indeed \page_one_command_set_botttom_insertions
+
+\let\page_col_command_flush_float_box \page_one_command_flush_float_box
+\let\page_col_command_synchronize_side_floats \page_one_command_synchronize_side_floats
+\let\page_col_command_flush_side_floats \page_one_command_flush_side_floats
+\let\page_col_command_flush_margin_blocks \page_one_command_flush_margin_blocks
+\let\page_col_command_test_page \page_one_command_test_page
+
+%D The separator code is more or less the same as mixed columns but we need
+%D to compensate for the top floats so we comment a bit for now.
+
+\newdimen\pagecolumnseparatorheight
+\newdimen\pagecolumnseparatordepth
+\newdimen\pagecolumnseparatorwidth
+
+% \installcorenamespace{pagecolumnsseparator}
+%
+% \unexpanded\def\installpagecolumnseparator#1#2%
+% {\setvalue{\??pagecolumnsseparator#1}{#2}}
+%
+% \installpagecolumnseparator\v!rule
+% {\vrule
+% \s!width \pagecolumnsparameter\c!rulethickness
+% \s!height\pagecolumnseparatorheight
+% \s!depth \pagecolumnseparatordepth
+% \relax}
+%
+% \def\page_col_routine_package_separate
+% {\ifcsname\??pagecolumnsseparator\p_separator\endcsname
+% \page_col_command_inject_separator
+% \else
+% \hss
+% \fi}
+%
+% \unexpanded\def\page_col_command_inject_separator
+% {\begingroup
+% \setbox\scratchbox\hbox to \zeropoint \bgroup
+% \hss
+% \starttextproperties
+% \usepagecolumnscolorparameter\c!rulecolor
+% \begincsname\??pagecolumnsseparator\p_separator\endcsname % was \c!rule
+% \stoptextproperties
+% \hss
+% \egroup
+% \ht\scratchbox\zeropoint
+% \dp\scratchbox\zeropoint
+% \hss
+% \box\scratchbox
+% \hss
+% \endgroup}
+
+\def\page_col_routine_package_separate
+ {\hss}
+
+%D \unknown
+
+\unexpanded\def\page_col_command_routine
+ {\page_sides_output_routine}
+
+% % not:
+%
+% \unexpanded\def\page_col_command_routine
+% {\ifconditional\c_page_sides_short
+% \page_sides_output_routine_yes_column
+% \else
+% \page_sides_output_routine_nop_column
+% \fi}
+%
+% \let\page_sides_output_routine_nop_column\page_sides_output_routine
+%
+% \def\page_sides_output_routine_yes_column % this might become the main one too
+% {\unvbox\normalpagebox % bah, and the discards?
+% %\page_col_column
+% \column % \page
+% % why was this \global\holdinginserts\zerocount
+% \global\setfalse\c_page_sides_short}
+
+\let\page_col_command_flush_all_floats\relax
+
+%D \unknown
+
+\defineoutputroutine
+ [\s!pagecolumn]
+ [\s!page_otr_command_routine =\page_col_command_routine,
+ \s!page_otr_command_package_contents =\page_col_command_package_contents,
+ \s!page_otr_command_set_vsize =\page_col_command_set_vsize,
+ \s!page_otr_command_set_hsize =\page_col_command_set_hsize,
+ % \s!page_otr_command_synchronize_hsize =\page_col_command_synchronize_hsize, % not done
+ \s!page_otr_command_next_page =\page_col_command_next_page,
+ \s!page_otr_command_next_page_and_inserts =\page_col_command_next_page_and_inserts,
+ \s!page_otr_command_set_top_insertions =\page_col_command_set_top_insertions,
+ \s!page_otr_command_set_bottom_insertions =\page_col_command_set_bottom_insertions,
+ \s!page_otr_command_flush_top_insertions =\page_col_command_flush_top_insertions,
+ \s!page_otr_command_flush_bottom_insertions=\page_col_command_flush_bottom_insertions,
+ \s!page_otr_command_check_if_float_fits =\page_col_command_check_if_float_fits,
+ % \s!page_otr_command_set_float_hsize =\page_col_command_set_float_hsize, % not done
+ \s!page_otr_command_flush_float_box =\page_col_command_flush_float_box,
+ \s!page_otr_command_side_float_output =\page_col_command_side_float_output,
+ \s!page_otr_command_synchronize_side_floats=\page_col_command_synchronize_side_floats,
+ \s!page_otr_command_flush_floats =\page_col_command_flush_floats,
+ \s!page_otr_command_flush_side_floats =\page_col_command_flush_side_floats,
+ \s!page_otr_command_flush_saved_floats =\page_col_command_flush_saved_floats,
+ \s!page_otr_command_flush_all_floats =\page_col_command_flush_all_floats,
+ \s!page_otr_command_flush_margin_blocks =\page_col_command_flush_margin_blocks,
+ \s!page_otr_command_test_column =\page_col_command_test_page
+ ]
+
+%D \unknown
+
+\installfloatmethod \s!pagecolumn \v!here \page_one_place_float_here
+\installfloatmethod \s!pagecolumn \v!force \page_one_place_float_force
+\installfloatmethod \s!pagecolumn \v!left \page_one_place_float_left
+\installfloatmethod \s!pagecolumn \v!right \page_one_place_float_right
+\installfloatmethod \s!pagecolumn \v!text \page_one_place_float_text
+\installfloatmethod \s!pagecolumn \v!top \page_one_place_float_top
+\installfloatmethod \s!pagecolumn \v!bottom \page_one_place_float_bottom
+\installfloatmethod \s!pagecolumn \v!auto \page_one_place_float_auto
+\installfloatmethod \s!pagecolumn \v!margin \page_one_place_float_margin
+\installfloatmethod \s!pagecolumn \v!opposite \page_one_place_float_face
+\installfloatmethod \s!pagecolumn \v!page \page_one_place_float_page
+\installfloatmethod \s!pagecolumn \v!leftpage \page_one_place_float_leftpage
+\installfloatmethod \s!pagecolumn \v!rightpage \page_one_place_float_rightpage
+\installfloatmethod \s!pagecolumn \v!inmargin \page_one_place_float_inmargin
+\installfloatmethod \s!pagecolumn \v!inleft \page_one_place_float_leftmargin
+\installfloatmethod \s!pagecolumn \v!inright \page_one_place_float_rightmargin
+\installfloatmethod \s!pagecolumn \v!leftmargin \page_one_place_float_leftmargin
+\installfloatmethod \s!pagecolumn \v!rightmargin \page_one_place_float_rightmargin
+\installfloatmethod \s!pagecolumn \v!leftedge \page_one_place_float_leftedge
+\installfloatmethod \s!pagecolumn \v!rightedge \page_one_place_float_rightedge
+\installfloatmethod \s!pagecolumn \v!somewhere \page_one_place_float_somewhere
+\installfloatmethod \s!pagecolumn \v!backspace \page_one_place_float_backspace
+\installfloatmethod \s!pagecolumn \v!cutspace \page_one_place_float_cutspace
+%installfloatmethod \s!pagecolumn \s!tblr \page_one_place_float_top
+%installfloatmethod \s!pagecolumn \s!lrtb \page_one_place_float_top
+%installfloatmethod \s!pagecolumn \s!tbrl \page_one_place_float_top
+%installfloatmethod \s!pagecolumn \s!fxtb \page_one_place_float_top
+%installfloatmethod \s!pagecolumn \s!rltb \page_one_place_float_top
+%installfloatmethod \s!pagecolumn \s!btlr \page_one_place_float_bottom
+%installfloatmethod \s!pagecolumn \s!lrbt \page_one_place_float_bottom
+%installfloatmethod \s!pagecolumn \s!btrl \page_one_place_float_bottom
+%installfloatmethod \s!pagecolumn \s!rlbt \page_one_place_float_bottom
+%installfloatmethod \s!pagecolumn \s!fxbt \page_one_place_float_bottom
+%installfloatmethod \s!pagecolumn \s!fixd \page_one_place_float_force
+
+\installfloatmethod \s!pagecolumn \v!local \somelocalfloat
+
+%D The main interface:
+
+\installcorenamespace{pagecolumns}
+
+\installframedcommandhandler \??pagecolumns {pagecolumns} \??pagecolumns
+
+\setuppagecolumns
+ [\c!distance=1.5\bodyfontsize,
+ \c!n=\plustwo,
+ %\c!align=, % inherit (also replaces tolerance)
+ %\c!before=,
+ %\c!after=,
+ %\c!separator=\v!none,
+ %\c!setups=,
+ %\c!balance=\v!no,
+ %\c!blank={\v!line,\v!fixed}, yes or no
+ \c!frame=\v!off,
+ \c!strut=\v!no,
+ \c!offset=\v!overlay,
+ %\c!maxheight=\textheight,
+ \c!maxwidth=\makeupwidth,
+ %\c!grid=\v!tolerant,
+ %\c!internalgrid=\v!line,
+ \c!direction=\v!normal]
+
+\let\startpagecolumns\relax % defined later
+\let\stoppagecolumns \relax % defined later
+
+\appendtoks % could become an option
+ \setuevalue{\e!start\currentpagecolumns}{\startpagecolumns[\currentpagecolumns]}%
+ \setuevalue{\e!stop \currentpagecolumns}{\stoppagecolumns}%
+\to \everydefinepagecolumns
+
+\ifdefined \columnwidth \else \newdimen\columnwidth \fi
+\ifdefined \columndistance \else \newdimen\columndistance \fi
+
+\unexpanded\def\startpagecolumns
+ {\page
+ \begingroup
+ \begingroup
+ \dosingleempty\page_col_start}
+
+\unexpanded\def\page_col_start[#1]%
+ {\doifelseassignment{#1}%
+ {\let\currentpagecolumns\empty
+ \setuppagecolumns[#1]}%
+ {\edef\currentpagecolumns{#1}}%
+ \c_page_col_n_of_columns\pagecolumnsparameter\c!n\relax
+ \ifnum\c_page_col_n_of_columns>\plusone
+ \expandafter\page_col_start_yes
+ \else
+ \expandafter\page_col_start_nop
+ \fi} % public
+
+\unexpanded\def\page_col_start_yes
+ {\d_page_col_distance \pagecolumnsparameter\c!distance\relax
+ % \d_page_col_max_height \pagecolumnsparameter\c!maxheight
+ \d_page_col_max_width \pagecolumnsparameter\c!maxwidth
+ % \d_page_col_balance_step \pagecolumnsparameter\c!step
+ \c_page_col_current \plusone
+ %
+ \d_page_col_column_width\dimexpr(\d_page_col_max_width-\d_page_col_distance*\numexpr(\c_page_col_n_of_columns-\plusone)\relax)/\c_page_col_n_of_columns\relax
+ %
+ \columnwidth \d_page_col_column_width
+ \columndistance \d_page_col_distance
+ %
+ \nopenalties
+ %
+ % \insidecolumnstrue % NO!
+ %
+ \let\column\page_col_column
+ %
+ \def\page_floats_get_used_hsize{\makeupwidth} % a bit of a hack
+ %
+ \usealignparameter \pagecolumnsparameter
+ \useblankparameter \pagecolumnsparameter
+ % \useprofileparameter\pagecolumnsparameter
+ %
+ \usemixedcolumnscolorparameter\c!color
+ %
+ \setupnotes[\c!width=\textwidth]%
+ %
+ \usesetupsparameter\pagecolumnsparameter
+ %
+ \setupoutputroutine[\s!pagecolumn]%
+ %
+ \setupfloats[\c!ntop=\plusthousand]%
+ % \setupfloats[\c!nbottom=\plusthousand]%
+ %
+ \page_col_command_set_vsize
+ \page_col_command_set_hsize
+ %
+ \nofcolumns\c_page_mix_n_of_columns
+ %
+ \unexpanded\def\page_col_start[##1]%
+ {\page_col_start_nop}%
+ %
+ \let\stoppagecolumns\page_col_stop_yes}
+
+\unexpanded\def\page_col_start_nop
+ {\nofcolumns\c_page_mix_n_of_columns
+ \let\stoppagecolumns\page_col_stop_nop}
+
+\unexpanded\def\page_col_stop_yes
+ {\column % \page_otr_eject_page
+ \page
+ \endgroup
+ % \setupoutputroutine[\s!singlecolumn]%
+ \page_otr_command_set_vsize
+ \page_otr_command_set_hsize
+ \page
+ \endgroup}
+
+\unexpanded\def\page_col_stop_nop
+ {\page
+ \endgroup
+ \endgroup}
+
+\protect \endinput