<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% \iffalse^^A meta-comment
% ======================================================================
% scrlayer-notecolumn.dtx
% Copyright (c) Markus Kohm, 2013-2023
%
% This file is part of the LaTeX2e KOMA-Script bundle.
%
% This work may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, version 1.3c of the license.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2005/12/01 and of this work.
%
% This work has the LPPL maintenance status "author-maintained".
%
% The Current Maintainer and author of this work is Markus Kohm.
%
% This work consists of all files listed in MANIFEST.md.
% ----------------------------------------------------------------------
% ======================================================================
%%% From File: $Id: scrlayer-notecolumn.dtx 4032 2023-04-17 09:45:11Z kohm $
%&lt;identify&gt;%%%            (run: identify)
%&lt;init&gt;%%%            (run: init)
%&lt;options&gt;%%%            (run: options)
%&lt;body&gt;%%%            (run: body)
%&lt;final&gt;%%%            (run: final)
%&lt;*dtx&gt;
\ifx\ProvidesFile\undefined\def\ProvidesFile#1[#2]{}\fi
\begingroup
  \def\filedate$#1: #2-#3-#4 #5${\gdef\filedate{#2/#3/#4}}
  \filedate$Date: 2023-04-17 11:45:11 +0200 (Mo, 17. Apr 2023) $
  \def\filerevision$#1: #2 ${\gdef\filerevision{v0.3.#2}}
  \filerevision$Revision: 4032 $
  \edef\reserved@a{%
    \noexpand\endgroup
    \noexpand\ProvidesFile{scrlayer-notecolumn.dtx}%
                          [\filedate\space\filerevision\space
                           KOMA-Script package source
  }%
\reserved@a
%&lt;/dtx&gt;
%&lt;*identify|doc&gt;
%&lt;interface&gt;\NeedsTeXFormat{LaTeX2e}[1995/12/01]
%&lt;interface&gt;\ProvidesPackage{scrlayer-notecolumn}[%
%&lt;doc&gt;\ProvidesFile{scrlayer-notecolumn.tex}[%
% Sometimes following will be replaced by !KOMASCRIPTVERSION:
%!SCRLAYERVERSION
%&lt;interface&gt;  package
%&lt;/identify|doc&gt;
%&lt;*dtx|identify|doc&gt;
  (end user interface for scrlayer)]
%&lt;/dtx|identify|doc&gt;
%&lt;*dtx&gt;
\ifx\documentclass\undefined
  \input scrdocstrip.tex
  \@@input scrkernel-version.dtx
  \expandafter\let\csname ifbetawas\expandafter\endcsname
  \csname ifbeta\endcsname
  \expandafter\let\csname ifbeta\expandafter\endcsname
  \csname iftrue\endcsname
  \@@input scrstrip.inc
  \KOMAdefVariable{COPYRIGHTFROM}{2013}
  \KOMAdefVariable{SCRLAYERVERSION}{%
    \space\space\filedate\space\filerevision\space KOMA-Script
  }%
  \generate{\usepreamble\defaultpreamble
    \file{scrlayer-notecolumn.sty}{%
      \from{scrlayer-notecolumn.dtx}{interface,notecolumn,identify}%
      \from{scrlayer.dtx}{interface,notecolumn,init}%
      \from{scrlayer-notecolumn.dtx}{interface,notecolumn,init}%
      \from{scrlayer.dtx}{interface,notecolumn,options}%
      \from{scrlayer-notecolumn.dtx}{interface,notecolumn,options}%
      \from{scrlayer.dtx}{interface,notecolumn,body}%
      \from{scrlayer-notecolumn.dtx}{interface,notecolumn,body}%
      \from{scrlayer-notecolumn.dtx}{interface,notecolumn,final}%
      \from{scrlogo.dtx}{logo}%
    }%
  }
  \expandafter\let\csname ifbeta\expandafter\endcsname
  \csname ifbetawas\endcsname
  \@@input scrstrop.inc
\else
  \let\endbatchfile\relax
\fi
\endbatchfile
\documentclass[USenglish]{koma-script-source-doc}
\usepackage{babel}
\usepackage{hvlogos}
\setcounter{StandardModuleDepth}{2}
\begin{document}
  \DocInput{scrlayer-notecolumn.dtx}
\end{document}
%&lt;/dtx&gt;
% \fi^^A meta-comment
%
% \changes{v0.0}{2013/04/26}{start of interface}
% \changes{v0.3.3532}{2020/09/11}{do not use deprecated interface commands}
% \changes{v3.36}{2022/02/10}{switch over from \cls*{scrdoc} to
%   \cls*{koma-script-source-doc}}
% \changes{v3.36}{2022/02/10}{require package \pkg*{scrlogo} instead of
%   defining \cs{KOMAScript}}
% \changes{v3.40}{2023/04/17}{guide names changed}
%
% \GetFileInfo{scrlayer-notecolumn.dtx}
% \title{Providing Note Columns Similar to \cs{marginpar} with
%   \href{https://komascript.de}{\KOMAScript} Package
%   \pkg*{scrlayer-notecolumn} as Proof of Concept about Layers with
%   \href{https://komascript.de}{\KOMAScript} Package \pkg*{scrlayer}}
% \author{\href{mailto:komascript@gmx.info}{Markus Kohm}}
% \date{Version \fileversion{} of \filedate}
% \maketitle
% \begin{abstract}
%   This package is only a proof of concept. The main sense of the package is,
%   to show the power of layers with \pkg{scrlayer}. It was never intended to
%   be used as a productivity package. So there is no support for using
%   it. Several features are only rudimentary. Several can be improved. Please
%   feel free to fork this package.
% \end{abstract}
% \tableofcontents
%
% \section{User Manual}
%
% You can find the user manuals of \pkg*{scrlayer-notecolumn} in the
% \KOMAScript{} manual, either the German \file{scrguide-de.pdf} or the
% English \file{scrguide-en.pdf}.
%
% \MaybeStop{\PrintIndex}
%
% \section{Implementation of \pkg*{scrlayer-notecolumn}}
%
%    \begin{macrocode}
%&lt;*interface&gt;
%    \end{macrocode}
%
%
% \subsection{Initialising some values before the options}
%
% Initialization before all options (even the options from
% \file{scrlayer.dtx}).
%
% Here we test the used pdf\TeX{} primitives.
% \changes{v0.1}{2015/10/07}{ready for renaming \cs{pdfsavepos} and
%   \cs{pdflastypos} in luaTeX}
% \changes{v0.1.2483}{2016/06/28}{grouping fixed}
%    \begin{macrocode}
%&lt;*init&gt;
\@tempswatrue
\scr@ifundefinedorrelax{pdfsavepos}{%
  \scr@ifundefinedorrelax{savepos}{%
    \expandafter\@tempswafalse
  }{%
    \let\scr@savepos\savepos
  }%
}{%
  \let\scr@savepos\pdfsavepos
}
\scr@ifundefinedorrelax{pdflastypos}{%
  \scr@ifundefinedorrelax{lastypos}{%
    \expandafter\@tempswafalse
  }{%
    \let\scr@lastypos\lastypos
  }%
}{%
  \let\scr@lastypos\pdflastypos
}%
\if@tempswa\else
  \PackageError{scrlayer-notecolumn}{missing pdfTeX/luaTeX features}{%
    This package needs \string\pdfsavepos\space or \string\savepos\space
    and\MessageBreak
    \string\pdflastypos\space or \string\lastypos.\MessageBreak
    This error is fatal, because usage of the package without these
    features\MessageBreak
    cannot work!\MessageBreak
    You shouldn't continue, but if you'd try, I'll try to abort the LaTeX run
  }%
  \batchmode\csname @@end\endcsname\end
\fi
%&lt;/init&gt;
%    \end{macrocode}
%
%
% \subsection{Making a note column}
%
% The package supports a various number of note columns. Each is referenced by
% a unique name.
%
% \begin{command}{\DeclareNoteColumn}
% \begin{description}
% \item[\oarg{option list}:] a comma-separated list of
%   \texttt{\meta{key}=\meta{value}} pairs.
% \item[\marg{string}:] the name of the note column (must be fully expandable
%   and expand to a string only).
% \end{description}
% That's the primary command for note columns. It defines everything, the note
% column needs.
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*{\DeclareNoteColumn}[2][]{%
%    \end{macrocode}
% First of all we need a box register. The contents of the note column will be
% build inside of this register. Since \eTeX{} registers shouldn't be a
% problem. User should use package \pkg{etex}, if he or she runs out of
% registers. Note, that the registers will stay allocated, if the interface
% will be removed! Nevertheless, the name will be destroyed!
%    \begin{macrocode}
  \@ifundefined{slnc@#2@box}{%
    \expandafter\newsavebox\csname slnc@#2@box\endcsname
  }{}%
%    \end{macrocode}
% There's also a kind of item stack of unprocessed notes for each note column.
%    \begin{macrocode}
  \@ifundefined{slnc@#2@unprocessed}{%
    \@namedef{slnc@#2@unprocessed}{}%
  }{}%
%    \end{macrocode}
% Next we need a horizontal positions and a width for the note column. Neither
% the horizontal position nor the width are stretchable or shrinkable. The
% position should be variable depending on the page. So it's better to use a
% macro instead of a length. The width isn't more variable than, e.g., the
% text width. So we can use a macro too. Both will be initialised to the
% normal marginal note column later.
% \changes{3.27}{2019/02/14}{initialization of one color stack per note column}
% For color support we also need one color stack per note column. A color
% stack is a feature only available for pdf\TeX{} and lua\TeX{}.
%    \begin{macrocode}
  \@ifundefined{slnc@#2@colorstack}{%
    \scr@ifundefinedorrelax{pdfcolorstackinit}{%
      \scr@ifundefinedorrelax{pdffeedback}{}{%
        \expandafter\chardef\csname slnc@#2@colorstack\endcsname=
        \pdffeedback colorstackinit direct {\slnc@initial@black}%
      }%
    }{%
      \expandafter\chardef\csname slnc@#2@colorstack\endcsname=
        \pdfcolorstackinit direct {\slnc@initial@black}%
    }%
  }{}%
%    \end{macrocode}
% If there isn't a font element for the (new) note column, we define a new one
% and add it to the auto-remove code:
%    \begin{macrocode}
  \@ifundefined{scr@fnt@notecolumn.#2}{%
    \@ifundefined{@notecolumn.#2font}{}{%
      \PackageInfo{scrlayer-notecolumn}{using already defined
        macro\MessageBreak
        `\expandafter\string\csname @notecolumn.#2font\endcsname' for font
        element\MessageBreak
        `notecolumn.#2'%
      }%
    }%
    \newkomafont{notecolumn.#2}{}%
  }{%
    \PackageInfo{scrlayer-notecolumn}{using already defined font
      element\MessageBreak
      `notecolumn.#2'%
    }%
  }%
%    \end{macrocode}
% After the initialisation we process the options, that may change the initial
% values.
%    \begin{macrocode}
  \newcommand*{\slnc@name}{}%
  \edef\slnc@name{#2}%
  \FamilyExecuteOptions[.definenotecolumn]{KOMAarg}{marginpar,#1}%
  \let\slnc@name\relax
%    \end{macrocode}
% The values are set up, so they may be used to declare a layer.
%    \begin{macrocode}
  \DeclareLayer[%
    foreground,%
    align=tl,%
    voffset=1in+\topmargin+\headheight+\headsep,%
    height=\dimexpr\textheight+\topskip\relax,%
    hoffset=\csname slnc@#2@pos\endcsname,%
    width=\csname slnc@#2@width\endcsname,%
    contents=\slnc@processnotes{#2}%
  ]{notecolumn.#2}
%    \end{macrocode}
% We need to add the layer to every page style. The easiest way to do this is
% to add it to the pseudo layer page style \pstyle{@everystyle@}.
% \changes{v0.1.1681}{2014/02/05}{add the layer only once}
%    \begin{macrocode}
  \IfLayerAtPageStyle{@everystyle@}{notecolumn.#2}{}{%
    \AddLayersToPageStyle{@everystyle@}{notecolumn.#2}%
  }%
%    \end{macrocode}
% Last but not least, we add the new note column to the note column procession
% list.
%    \begin{macrocode}
  \@cons\slnc@processnotecolumns{{#2}}%
}
%    \end{macrocode}
% \begin{macro}{\slnc@initial@black}
% \changes{v0.2.3085}{2019/02/14}{added}
% The initial black is the color used to initialize the color stacks. As long
% as only pdf\TeX{} and lua\TeX{} provide color stacks, we can initialize it
% with \texttt{0 g 0 G}. However it may be better to use the initial
% \cs{current@color} of the used color package. Using \cs{default@color} would
% be even better, but this is not available until \cs{begin\{document\}}.
%    \begin{macrocode}
\newcommand*{\slnc@initial@black}{0 g 0 G}%
\AfterPackage*{color}{%
  \let\slnc@initial@black\current@color
  \AtBeginDocument{\let\slnc@initial@black\default@color}%
}%
\AfterPackage*{xcolor}{%
  \let\slnc@initial@black\current@color
  \AtBeginDocument{\let\slnc@initial@black\default@color}%
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@initial@black
% \begin{macro}{\slnc@processnotecolumns}
% This is a list of all declared note columns in \LaTeX{} syntax (using
% \cs{@cons} and \cs{@elt} etc.).
%    \begin{macrocode}
\newcommand*{\slnc@processnotecolumns}{}%
%    \end{macrocode}
% \end{macro}^^A \slnc@processnotecolumns
%    \begin{macrocode}
%&lt;/body&gt;
%    \end{macrocode}
% One note column will be declared by default:
%    \begin{macrocode}
%&lt;*final&gt;
\DeclareNoteColumn{marginpar}
%&lt;/final&gt;
%&lt;*body&gt;
%    \end{macrocode}
% \begin{macro}{\slnc@testforpagestylewarning}
% Not all page styles are layer page styles, but only layer page styles can be
% extended by the note column layers. So we warn, if another page style has
% been selected.
%    \begin{macrocode}
\newcommand*{\slnc@testforpagestylewarning}{%
  \IfLayerPageStyleExists{\currentpagestyle}{}{%
    \PackageWarning{scrlayer-notecolumn}{%
      output of note columns delayed,\MessageBreak
      because with `\currentpagestyle'\MessageBreak
      a page style has been selected, that\MessageBreak
      isn't a layer page style,%
    }%
  }%
}%
\AfterSelectAnyPageStyle{\slnc@testforpagestylewarning}
%    \end{macrocode}
% \end{macro}^^A \slnc@testforpagestylewarning
% \begin{option}{position,width,font,marginpar,normalmarginpar,reversemarginpar}
% Last but not least we have to define the options for the \meta{option
% list}.
%    \begin{macrocode}
\DefineFamilyMember[.definenotecolumn]{KOMAarg}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{position}{%
  \@namedef{slnc@\slnc@name @pos}{\dimexpr #1\relax}%
  \FamilyKeyStateProcessed
}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{width}{%
  \@namedef{slnc@\slnc@name @width}{\dimexpr #1\relax}%
  \FamilyKeyStateProcessed
}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{font}{%
  \setkomafont{notecolumn.\slnc@name}{#1}%
  \FamilyKeyStateProcessed
}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{marginpar}[\relax]{%
  \FamilyKeyStateProcessed
  \scrlayer@testunexpectedarg{marginpar}{#1}%
  \edef\reserved@a{\noexpand\slnc@defpos{\slnc@name}}\reserved@a
  \@namedef{slnc@\slnc@name @width}{\marginparwidth}%
}
%    \end{macrocode}
% \begin{macro}{\slnc@defpos}
% Little helper for option \opt{marginpar}. The argument is the expanded
% name of the note column.
%    \begin{macrocode}
\newcommand*\slnc@defpos[1]{%
  \@namedef{slnc@#1@pos}{%
    \ifodd\value{page}
      \if@reversemargin
%    \end{macrocode}
% The reverse marginal note column on odd pages is at the left margin.
%    \begin{macrocode}
        \dimexpr \oddsidemargin+1in
                -\marginparsep-\csname slnc@#1@width\endcsname\relax
      \else
%    \end{macrocode}
% The normal marginal note column on odd pages is the right margin.
%    \begin{macrocode}
        \dimexpr \oddsidemargin+1in
                +\textwidth+\marginparsep\relax
      \fi
    \else
      \if@twoside
        \if@reversemargin
%    \end{macrocode}
% The reverse marginal note column on even pages is the right margin.
%    \begin{macrocode}
          \dimexpr \evensidemargin+1in
                  +\textwidth+\marginparsep\relax
        \else
%    \end{macrocode}
% The normal marginal note column on even pages is at the left margin.
%    \begin{macrocode}
          \dimexpr \evensidemargin+1in
                  -\marginparsep-\csname slnc@#1@width\endcsname\relax
        \fi
      \else
%    \end{macrocode}
%    \begin{macrocode}
% If not in two-side mode, do the same already done for odd pages.
        \if@reversemargin
          \dimexpr \oddsidemargin+1in
                  -\marginparsep-\csname slnc@#1@width\endcsname\relax
        \else
          \dimexpr \oddsidemargin+1in
                  +\textwidth+\marginparsep\relax
        \fi
      \fi
    \fi
  }%
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@defpos
%    \begin{macrocode}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{normalmarginpar}[\relax]{%
  \FamilyKeyStateProcessed
  \scrlayer@testunexpectedarg{normalmarginpar}{#1}%
  \edef\reserved@a{\noexpand\slnc@defnormalpos{\slnc@name}}\reserved@a
  \@namedef{slnc@\slnc@name @width}{\marginparwidth}%
}
%    \end{macrocode}
% \begin{macro}{\slnc@defnormalpos}
% Little helper for option \opt{normalmarginpar}. The argument is the
% expanded name of the note column.
%    \begin{macrocode}
\newcommand*\slnc@defnormalpos[1]{%
  \@namedef{slnc@#1@pos}{%
    \ifodd\value{page}
%    \end{macrocode}
% The normal marginal note column on odd pages is the right margin.
%    \begin{macrocode}
      \dimexpr \oddsidemargin+1in
              +\textwidth+\marginparsep\relax
    \else
      \if@twoside
%    \end{macrocode}
% The normal marginal note column on even pages is at the left margin.
%    \begin{macrocode}
        \dimexpr \evensidemargin+1in
                -\marginparsep-\csname slnc@#1@width\endcsname\relax
      \else
%    \end{macrocode}
%    \begin{macrocode}
% If not in two-side mode, do the same already done for odd pages.
        \dimexpr \oddsidemargin+1in
                +\textwidth+\marginparsep\relax
      \fi
    \fi
  }%
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@defnormalpos
%    \begin{macrocode}
\DefineFamilyKey[.definenotecolumn]{KOMAarg}{reversemarginpar}[\relax]{%
  \FamilyKeyStateProcessed
  \scrlayer@testunexpectedarg{reversemarginpar}{#1}%
  \edef\reserved@a{\noexpand\slnc@defreversepos{\slnc@name}}\reserved@a
  \@namedef{slnc@\slnc@name @width}{\marginparwidth}%
}
%    \end{macrocode}
% \begin{macro}{\slnc@defreversepos}
% Little helper for option \opt{reversemarginpar}. The argument is the
% expanded name of the note column.
%    \begin{macrocode}
\newcommand*\slnc@defreversepos[1]{%
  \@namedef{slnc@#1@pos}{%
    \ifodd\value{page}
%    \end{macrocode}
% The reverse marginal note column on odd pages is at the left margin.
%    \begin{macrocode}
      \dimexpr \oddsidemargin+1in
              -\marginparsep-\csname slnc@#1@width\endcsname\relax
    \else
      \if@twoside
%    \end{macrocode}
% The reverse marginal note column on even pages is the right margin.
%    \begin{macrocode}
        \dimexpr \evensidemargin+1in
                +\textwidth+\marginparsep\relax
      \else
%    \end{macrocode}
%    \begin{macrocode}
% If not in two-side mode, do the same already done for odd pages.
        \dimexpr \oddsidemargin+1in
                -\marginparsep-\csname slnc@#1@width\endcsname\relax
      \fi
    \fi
  }%
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@defreversepos
%    \begin{macrocode}
%&lt;/body&gt;
%    \end{macrocode}
% \end{option}^^A position … reversemarginpar
% \end{command}^^A \DeclareNoteColumn
%
% \begin{command}{\DeclareNewNoteColumn,\ProvideNoteColumn,\RedeclareNoteColumn}
% Like \cs{DeclareNoteColumn} but with restrictions, if the note column has
% (not) been declared already.
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*{\DeclareNewNoteColumn}[2][]{%
  \scr@ifundefinedorrelax{slnc@#2@box}{}{%
    \PackageError{scrlayer-notecolumn}{note column `#2' already defined}{%
      You may declare only note columns, that haven't been declared
      previously using\MessageBreak
      \string\DeclareNewNoteColumn. See also the alternatives
      \string\RedeclareNoteColumn,\MessageBreak
      \string\ProvideNoteColumn, and \string\DeclareNoteColumn.\MessageBreak
      Nevertheless, if you'll continue, declaration will be done.%
    }%
  }%
  \DeclareNoteColumn[{#1}]{#2}%
}%
\newcommand*{\ProvideNoteColumn}[2][]{%
  \scr@ifundefinedorrelax{slnc@#2@box}{}{%
    \PackageInfo{scrlayer-notecolumn}{\string\ProvideNoteColumn{#2}
      ignored,\MessageBreak
      because of already defined\MessageBreak
      not column}%
  }{%
    \DeclareNoteColumn[{#1}]{#2}%
  }%
}%
\newcommand*{\RedeclareNoteColumn}[2][]{%
  \scr@ifundefinedorrelax{slnc@#2@box}{%
    \PackageError{scrlayer-notecolumn}{note column `#2' undefined}{%
      You may declare only note columns, that have been declared
      previously using\MessageBreak
      \string\RedeclareNoteColumn. See also the alternatives
      \string\DeclareNewNoteColumn,\MessageBreak
      \string\ProvideNoteColumn, and \string\DeclareNoteColumn.\MessageBreak
      Nevertheless, if you'll continue, declaration will be done.%
    }%
  }{}%
  \DeclareNoteColumn[{#1}]{#2}%
}%
%&lt;/body&gt;
%    \end{macrocode}
% \end{command}
%
%
% \subsection{Setting a note column}
%
% We already have commands to declare note columns. But we also need a command
% to put contents into the note columns and to output the note columns.
%
% \begin{macro}{\tf@slnc}
% \changes{v0.1.2395}{2016/03/25}{write to \file{aux}-file with
%   \cs{if@filesw}}
% \begin{macro}{\slnc@initwrite,\slnc@openwrite}
% \changes{v0.1.2928}{2018/02/02}{use \cs{closein} instead of \cs{closeout}
%   to close \cs{slnc@file}}
% First of all we need a file to write the notes to. We use the
% \file{aux}-file to write into the file, because we need to read the file
% while the document will be typeset and the same time we need to write into
% the file. Note, that the file will be still reserved on auto-removing the
% interface!
%    \begin{macrocode}
%&lt;*body&gt;
\newwrite\tf@slnc
\AtBeginDocument{%
  \if@filesw
    \immediate\write\@auxout{%
      \noexpand\csname slnc@initwrite\noexpand\endcsname
    }%
  \fi
}%
\AtEndDocument{\let\slnc@initwrite\slnc@openwrite}%
\newcommand*{\slnc@initwrite}{}%
\newcommand*{\slnc@openwrite}{%
  \immediate\closein\slnc@file
%&lt;*trace&gt;
  \PackageInfo{scrlayer-notecolumn}{%
    Opening `\jobname.slnc'\MessageBreak
    for writing}%
%&lt;/trace&gt;
  \immediate\openout\tf@slnc\jobname.slnc
}
%    \end{macrocode}
% After reading the main \file{aux}-file at |\end{document}|, we again
% calculate the md5 checksum of the \file{slnc}-file. If it has been changed
% we set |\if@tempswa| to |\iftrue| to provocate a rerun message.
% \changes{v0.1.2872}{2018/01/17}{usage of Lua function \texttt{slncmdfivesum}}
% \changes{v0.1.2972}{2018/04/01}{usage of not yet documented Xe\TeX{}
%   primitive \cs{mdfivesum}}
%    \begin{macrocode}
\AfterReadingMainAux{%
  \immediate\closeout\tf@slnc
  \begingroup
    \scr@ifundefinedorrelax{pdfmdfivesum}{%
      \scr@ifundefinedorrelax{mdfivesum}{%
        \ifdefined\directlua
          \edef\reserved@a{\directlua{slnc.mdfivesum(slnc.slncfile)}}%
        \else
          \let\reserved@a\relax
        \fi
      }{%
        \edef\reserved@a{\mdfivesum file {\jobname.slnc}}%
      }%
    }{%
      \edef\reserved@a{\pdfmdfivesum file {\jobname.slnc}}%
    }%
    \ifx\reserved@a\relax
      \PackageWarningNoLine{scrlayer-notecolumn}{%
        \string\pdfmdfivesum\space unavailable.\MessageBreak
        The package needs \string\pdfmdfivesum,\MessageBreak
        \string\mdfivesum, or LuaTeX to test whether\MessageBreak
        or not one more LaTeX run is needed to place the\MessageBreak
        note columns correctly. If these are unavailable\MessageBreak
        you have to do the decision without the help\MessageBreak
        of the package%
      }%
    \else
      \ifx \slnc@mdfivesum\reserved@a
%&lt;*trace&gt;
        \PackageInfo{scrlayer-notecolumn}{%
          MD5 of current `\jobname.slnc':\MessageBreak 
          \reserved@a}%
%&lt;/trace&gt;
      \else
%&lt;*trace&gt;
        \PackageWarningNoLine{scrlayer-notecolumn}{%
          MD5 of slnc-file changed.\MessageBreak
          Last: \slnc@mdfivesum\MessageBreak
          New: \space \reserved@a\MessageBreak
          At least one more LaTeX rerun needed to\MessageBreak
          make note columns right%
        }%
%&lt;/trace&gt;
        \aftergroup\@tempswatrue
      \fi
    \fi
  \endgroup
}
%&lt;/body&gt;
%    \end{macrocode}
% \changes{v0.3.3600}{2021/05/30}{use of \pkg*{scrwfile}'s never list}%
% The easiest way to make it compatible with \pkg*{scrwfile} is to put it
% on the \emph{never} list.
%    \begin{macrocode}
%&lt;*body&gt;
\AfterPackage*{scrwfile}{%
  \@ifundefined{scrwfile@never}{\def}{\g@addto@macro}%
  \scrwfile@never{slnc}%
}
%&lt;/body&gt;
%    \end{macrocode}
% \end{macro}^^A \slnc@initwrite,\slnc@openwrite
% \end{macro}^^A \tf@slnc
%
% \begin{command}{\makenote}
% \begin{description}
% \item[\oarg{string}:] the name of the note column the note should be added
%   to (must be fully expandable and expand to a string only). The default
%   value is |marginpar|.
% \item[\marg{code}:] the code, that should become par of the note
%   column. Note, that this will be written protected to a file. So you have
%   to use \cs{protect} if a macro shouldn't be expanded while writing or may
%   break while writing.
% \end{description}
% There is a star variant with the same parameters, that writes the
% \meta{code} un-expanded. To do so, we need some internal commands.
% \begin{macro}{\slnc@unexpanded,\slnc@makenote}
% \changes{v0.1.2583}{2017/02/08}{added}
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*{\slnc@unexpanded}{}
\let\slnc@unexpanded\detokenize
\newcommand*{\makenote}{%
  \kernel@ifstar{\let\slnc@unexpanded\detokenize\slnc@makenote}%
                {\let\slnc@unexpanded\@firstofone\slnc@makenote}%
}%
\newcommand{\slnc@makenote}[2][marginpar]{%
  \@bsphack
  \scr@savepos
  \addtocontents{slnc}{%
    \string\slnc@note{#1}%
                     {\noexpand\number\value{slncpage}}%
                     {\noexpand\number\scr@lastypos}%
                     {\slnc@unexpanded{#2}}%
  }%
  \@esphack
}%
%    \end{macrocode}
% \begin{counter}{slncpage}
% This counter should be increased once per page with note column. This may
% be done simply at a once per page executed hook of
% \pstyle{@everystyle@}. You should note, that auto-remove wouldn't
% remove the counter.
%    \begin{macrocode}
\@ifundefined{c@slncpage}{%
  \newcounter{slncpage}%
  \AddToLayerPageStyleOptions{@everystyle@}{%
    onbackground=\stepcounter{slncpage}%
  }%
}{}
%&lt;/body&gt;
%    \end{macrocode}
% \end{counter}^^A slncpage
% \end{macro}^^A \slnc@makenote,\slnc@unexpanded
% \end{command}^^A \makenote
%
% \begin{macro}{\slnc@processnotes}
% \begin{description}
% \item[\marg{string}:] the name of the note column (must be fully expandable
%   an expand to a string only).
% \end{description}
% Each note column typesets the notes with this command. It works in following
% steps:
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*{\slnc@processnotes}[1]{%
%    \end{macrocode}
% Read as long notes from the notes file until the number at \#2 of
% \cs{slnc@note} in the file is greater than \cnt{slncpage}. Put all
% these to the corresponding unprocessed list.
%    \begin{macrocode}
  \begingroup
    \slnc@readnotes{\value{slncpage}}%
%    \end{macrocode}
% Process the unprocessed list of the current note column
%    \begin{macrocode}
    \expandafter\let\expandafter\reserved@a
    \csname slnc@#1@unprocessed\endcsname
    \expandafter\global
    \expandafter\let\csname slnc@#1@unprocessed\endcsname\@empty
    \def\slnc@notesyncfonttest##1{%
      \ifhmode
        \PackageError{scrlayer-notecolumn}{%
          illegal font setting for `notecolumn.##1'%
        }{%
          Current setting of font for `notecolumn.##1' switches
          from\MessageBreak
          vertical mode to horizontal mode. This is
          illegal!\MessageBreak
          You have to change the font setting to fix
          this.\MessageBreak
          If you'll continue vertical alignment of notes may fail%
        }%
        \par\vskip-\dimexpr \baselineskip+\parskip\relax
      \fi
    }%
    \long\def\slnc@note##1##2##3##4{%
%&lt;trace&gt;        \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): ##2&lt;=\theslncpage?}%
      \ifnum ##2&gt;\value{slncpage}\relax
%&lt;trace&gt;          \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): no: unprocess note}%
        \expandafter\g@addto@macro\csname slnc@#1@unprocessed\endcsname{%
          \slnc@note{##1}{##2}{##3}{##4}%
        }%
      \else
        \ifnum ##2&lt;\value{slncpage}\relax
          \PackageWarning{scrlayer-notecolumn}{note of type `#1' delayed}%
        \fi
        \boxmaxdepth\maxdepth
        \expandafter\setbox\csname slnc@#1@box\endcsname\vbox{%
          \expandafter\hsize\csname slnc@#1@width\endcsname
          \normalfont\normalsize
%    \end{macrocode}
% \changes{v0.2.3085}{2019/02/14}{using color stack if available}
% If a color stack is available we switch to it before changing the font. So a
% color definition inside the font would overwrite every color change inside
% the column! But if we don't have a color stack, color switching is not
% permitted!
%    \begin{macrocode}
          \slnc@switchcolorstack{#1}%
          {%
            \usekomafont{notecolumn.#1}{%
              \slnc@notesyncfonttest{#1}%
              \expandafter\ifvoid\csname slnc@#1@box\endcsname
                \expandafter\setbox\csname slnc@#1@box\endcsname\vbox{%
                  \kern\dimexpr\topskip-\baselineskip\relax
                }%
              \fi
%    \end{macrocode}
% \changes{v0.1}{2015/10/07}{ready for renaming \cs{pdfpageheight} in
%   luaTeX}
% From lua\TeX~0.80.1 \cs{pdfpageheight} will be renamed into
% \cs{pageheight}. So we have to do an extra test for the new primitive.
%    \begin{macrocode}
              \scr@ifundefinedorrelax{pdfpageheight}{%
                \scr@ifundefinedorrelax{pageheight}{%
                  \@tempdima=\paperheight
                }{%
                  \@tempdima=\pageheight
                }%
              }{%
                \@tempdima=\pdfpageheight
              }%
              \@tempdima=\dimexpr \@tempdima-##3sp
                                  -1in-\topmargin
                                  -\headheight-\headsep
                                  -\baselineskip
                         \relax
              \@tempdimb=\dimexpr \expandafter\ht\csname slnc@#1@box\endcsname
                                 +\expandafter\dp\csname slnc@#1@box\endcsname
                         \relax
              \ifdim\@tempdima&lt;\@tempdimb
%&lt;*trace&gt;
                \PackageInfo{scrlayer-notecolumn}{%
                  Note moved down from\MessageBreak
                  \the\@tempdima\space to \the\@tempdimb\MessageBreak
                  at note box `#1'
                }%
%&lt;/trace&gt;
              \else
                \ifdim\@tempdima&gt;\@tempdimb
%&lt;*trace&gt;
                  \PackageInfo{scrlayer-notecolumn}{%
                    Adding vertical white space from\MessageBreak
                    \the\@tempdimb\space to \the\@tempdima\MessageBreak
                    into note box `#1'
                  }%
%&lt;/trace&gt; 
                  \expandafter\setbox\csname slnc@#1@box\endcsname
                  \vbox {%
                    \expandafter\unvbox\csname slnc@#1@box\endcsname
                    \kern\dimexpr\@tempdima-\@tempdimb\relax
                  }%
                \fi
              \fi
              \expandafter\ifvoid\expandafter\csname slnc@#1@box\endcsname
              \else
                \@tempdima\dimexpr
                            \dp\strutbox
                            -\dp\csname slnc@#1@box\endcsname
                          \relax
                \expandafter\unvbox\csname slnc@#1@box\endcsname
                \ifdim\@tempdima&gt;\z@ \kern\@tempdima\fi
              \fi
%    \end{macrocode}
% \changes{v0.1.2582}{2017/02/08}{restore several commands}
% Some commands have to be restored when processing the note.
%    \begin{macrocode}
              \slnc@restoreinnote
              \strut\ignorespaces ##4\par
            }%
          }%
        }%
      \fi
    }%
    \def\slnc@sync##1##2##3##4{%
      \ifnum ##2&gt;\value{slncpage}\relax
        \expandafter\g@addto@macro\csname slnc@#1@unprocessed\endcsname{%
          \slnc@sync{##1}{##2}{##3}{}%
        }%
      \else
        \if@filesw
          \expandafter\setbox\csname slnc@#1@box\endcsname\vbox{%
            \expandafter\unvbox\csname slnc@#1@box\endcsname
            \scr@savepos
            \protected@write\@auxout{}{%
              \string\newlabel{notecolumn.##1.##3.syncnote.label}{%
                {%
                  \noexpand\number\scr@lastypos
                }{\thepage}%
              }%
            }%
          }%
        \fi
      \fi
    }%
    \reserved@a
    \expandafter\ifvoid\csname slnc@#1@box\endcsname
%&lt;*trace&gt;
      \PackageInfo{scrlayer-notecolumn}{Note box `#1' empty}%
%&lt;/trace&gt;
    \else
      \ifdim \dimexpr \expandafter\ht\csname slnc@#1@box\endcsname
                     +\expandafter\dp\csname slnc@#1@box\endcsname
             \relax &gt;\textheight\relax
%&lt;*trace&gt;
        \PackageInfo{scrlayer-notecolumn}{Split note box `#1'}%
%&lt;/trace&gt;
        \splittopskip\topskip
        \splitmaxdepth\baselineskip
%    \end{macrocode}
% Bring back the colors:
% \changes{v0.2.3085}{2019/02/14}{\cs{slnc@switchcolorstack} added}
%    \begin{macrocode}
        \usekomafont{notecolumn.#1}{%
          \expandafter\vsplit\csname slnc@#1@box\endcsname to
          \textheight\relax
        }%
        \expandafter\ifvoid\csname slnc@#1@box\endcsname
        \else
          \expandafter\setbox\csname slnc@#1@box\endcsname\vbox{%
            \slnc@switchcolorstack{#1}%
            \expandafter\unvbox\csname slnc@#1@box\endcsname
          }%
        \fi
      \else
%&lt;*trace&gt;
        \PackageInfo{scrlayer-notecolumn}{Flush note box `#1'}%
%&lt;/trace&gt;
%    \end{macrocode}
% Bring back the colors:
% \changes{v0.2.3085}{2019/02/14}{\cs{slnc@switchcolorstack} added}
%    \begin{macrocode}
        \usekomafont{notecolumn.#1}{%
          \slnc@switchcolorstack{#1}%
          \expandafter\box\csname slnc@#1@box\endcsname%
        }%
      \fi
    \fi
    \expandafter\global
    \expandafter\setbox\csname slnc@#1@box\expandafter\endcsname
    \expandafter\box\csname slnc@#1@box\endcsname
  \endgroup
}
%    \end{macrocode}
% \begin{macro}{\slnc@switchcolorstack}
% \changes{v0.2.3085}{2019/02/14}{added}
% This either redefines \cs{set@color} or switches to the color stack of the
% note column given by the argument.
%    \begin{macrocode}
\newcommand*{\slnc@switchcolorstack}[1]{%
  \scr@ifundefinedorrelax{slnc@#1@colorstack}{%
    \def\set@color{%
      \PackageWarningNoLine{scrlayer-notecolumn}{%
        unsupported change of color!\MessageBreak
        It seems you are using a TeX engine,\MessageBreak
        that does not support switching the\MessageBreak
        color stack like pdfTeX or luaTeX do.\MessageBreak
        Because of this, usage of \string\color,\MessageBreak
        \string\textcolor\space etc. inside a note
        column\MessageBreak
        is not supported%
      }%
    }%
  }{%
    \scr@ifundefinedorrelax{@pdfcolorstack}{%
    }{%
      \expandafter\let\expandafter\@pdfcolorstack
      \csname slnc@#1@colorstack\endcsname
    }%
    \scr@ifundefinedorrelax{pdfcolorstack}{%
      \scr@ifundefinedorrelax{pdfextension}{%
        \PackageError{scrlayer-notecolumm}{%
          color stack defined but not usable%
        }{%
          \expandafter\string
          \csname slnc@#1@colorstack\endcsname\space defined
          \MessageBreak
          but neither \string\pdfcolorstack\space nor
          \string\pdfextension.\MessageBreak
          This should never happen!%
        }%
      }{%
        \pdfextension colorstack
        \csname slnc@#1@colorstack\endcsname current\relax
      }%
    }{%
      \pdfcolorstack
      \csname slnc@#1@colorstack\endcsname current\relax
    }%
  }%
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@switchcolorstack
% \begin{command}{\restoreinnote}
% \changes{v0.1.2582}{2017/02/08}{added}
% \begin{macro}{\slnc@restoreinnote}
% \changes{v0.1.2582}{2017/02/08}{added}
% Some commands have to be restored while processing the notes. By default
% these are \cs{label}, \cs{index}, \cs{glossary}. More can be added using
% \cs{restoreinnote}. The storage is \cs{slnc@restoreinnote}.
%    \begin{macrocode}
\newcommand*{\slnc@restoreinnote}{}
\let\slnc@restoreinnote\@empty
\newcommand*\restoreinnote[1]{%
  \AtBeginDocument{%
    \expandafter\newcommand\expandafter*\csname slnc\string#1\endcsname{}%
    \expandafter\let\csname slnc\string#1\endcsname#1%
    \g@addto@macro\slnc@restoreinnote{%
      \expandafter\let\expandafter#1\csname slnc\string#1\endcsname
    }%
  }%
}
\@onlypreamble\restoreinnote
\restoreinnote\label
\restoreinnote\index
\restoreinnote\glossary
%    \end{macrocode}
% \end{macro}^^A \slnc@restoreinnote
% \end{command}^^A \restoreinnote
% \begin{macro}{\slnc@readnotes}
% Read as long notes from the notes file until the number at \#2 of
% \cs{slnc@note} or \cs{slnc@sync} in the file is greater than
% \cnt{slncpage}. Put all these to the corresponding unprocessed list.
% \begin{macro}{\slnc@catcodes}
% \changes{v0.3}{2019/03/02}{added}
% We need a helper macro \cs{slnc@catcodes} to restore (some of) the catcodes
% before reading from file.
%    \begin{macrocode}
\newcommand*{\slnc@catcodes}{}%
\AtBeginDocument{%
  \begingroup
    \def\do#1{%
      \protected@xdef\slnc@catcodes{\slnc@catcodes
        \catcode`\protect#1=\the\catcode`#1\relax
      }%
    }%
    \dospecials
    \let\protect\noexpand
    \xdef\slnc@catcodes{\slnc@catcodes\catcode`\protect\@=11\relax}%
  \endgroup
}
%    \end{macrocode}
% \end{macro}^^A \slnc@catcodes
%    \begin{macrocode}
\newcommand*\slnc@readnotes[1]{%
  \ifeof\slnc@file\else
    \ifnum \number #1&lt;\slnc@unprocessed\relax
      \@tempswafalse
    \else
      \@tempswatrue
    \fi
    \@whilesw\if@tempswa\fi{%
      \begingroup
        \slnc@catcodes
        \endlinechar\m@ne
        \read\slnc@file to\reserved@a
        \edef\reserved@a{%
          \endgroup
          \noexpand\def\noexpand\reserved@a{%
            \unexpanded\expandafter{\reserved@a}%
          }%
        }%
      \reserved@a
      \expandafter\slnc@iofv\expandafter\reserved@b\reserved@a
      \@empty\@empty\@empty\@empty\@empty
      \@tempswafalse
      \@for\reserved@c :={\slnc@note },{\slnc@sync }\do{%
        \ifx\reserved@b\reserved@c \@tempswatrue\fi
      }%
      \if@tempswa
        \@tempswafalse
        \expandafter\slnc@iiiofv\expandafter\reserved@b\reserved@a
        \@empty\@empty\@empty\@empty\@empty
        \ifx\reserved@b\@empty
          \PackageError{scrlayer-notecolumn}{internal syntax error}{%
            Unexpected syntax of file `\jobname.slnc'.\MessageBreak
            Second argument should be a number.\MessageBreak
            I don't know what to do with\MessageBreak
            \expandafter\detokenize\expandafter{\reserved@a}%
          }%
          \@tempswatrue
        \else
          \global\let\slnc@unprocessed\reserved@b
          \expandafter\slnc@iiofv\expandafter\reserved@b\reserved@a
          \@empty\@empty\@empty\@empty\@empty
          \@ifundefined{slnc@\reserved@b @unprocessed}{%
            \PackageWarning{scrlayer-notecolumn}{%
              column `\reserved@b' undefined.\MessageBreak
              You should declare the column before the usage.\MessageBreak
              Notes will be lost%
            }%
          }{%
            \expandafter\g@addto@macro
            \csname slnc@\reserved@b @unprocessed\expandafter\endcsname
            \expandafter{%
              \reserved@a
            }%
          }%
          \ifnum \number #1&lt;\slnc@unprocessed\relax
            \@tempswafalse
          \else
            \@tempswatrue
          \fi
        \fi
      \else
%&lt;*trace&gt;
        \PackageInfo{scrlayer-notecolumn}{%
          Ignoring `\expandafter\detokenize\expandafter{\reserved@a}'}%
%&lt;/trace&gt;
        \@tempswatrue
      \fi
      \ifeof\slnc@file\@tempswafalse\fi
    }%
  \fi
}%
%    \end{macrocode}
% \end{macro}^^A \slnc@readnotes
% \begin{macro}{\slnc@iofv,\slnc@iiofv,\slnc@iiiofv}
%    \begin{macrocode}
\newcommand\slnc@iofv[6]{\def#1{#2}}%
\newcommand\slnc@iiofv[6]{\def#1{#3}}%
\newcommand\slnc@iiiofv[6]{\def#1{#4}}%
%    \end{macrocode}
% \end{macro}^^A \slnc@iofv … \slnc@iiiofv
% \begin{macro}{\slnc@unprocessed}
% The \#2 of the last read note column from notes file.
%    \begin{macrocode}
\newcommand*{\slnc@unprocessed}{0}%
%&lt;/body&gt;
%    \end{macrocode}
% \begin{macro}{\slnc@file}
% The input file with the unprocessed notes.
% \changes{v0.1.2928}{2018/02/02}{use \cs{closein} instead of \cs{closeout}
%   to close \cs{slnc@file}}
% \begin{macro}{\slnc@mdfivesum}
% \changes{v0.1.2872}{2018/01/17}{definition and usage of Lua function
%   \texttt{slncmdfivesum}}
% \changes{v0.1.2972}{2018/04/01}{usage of not yet documented \XeTeX{}
%   primitive \cs{mdfivesum}}
% \changes{v0.3.3591}{2021/03/25}{Lua function name changed to
%   \texttt{slnc.mdfivesum}}
% \changes{v0.3.3591}{2021/03/25}{new Lua variable \texttt{slnc.slncfile}}
% The MD5 sum of the file before opening it for reading.
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*{\slnc@mdfivesum}{}
\let\slnc@mdfivesum\@empty
\scr@ifundefinedorrelax{pdfmdfivesum}{%
  \scr@ifundefinedorrelax{mdfivesum}{%
    \ifdefined\directlua
      \directlua{%
        slnc = slnc or {}
        function slnc.mdfivesum(filename)
          local fh = io.open(filename,"rb")
          if fh then
            local sum=md5.sumhexa(fh:read("*a"))
            tex.sprint(sum)
            fh:close()
          end
        end
        if (string.sub(tex.jobname,1,1) == '"')
           and (string.sub(tex.jobname,string.len(tex.jobname),-1) == '"')
           then
          slnc.slncfile = string.sub(tex.jobname,2,-2)
        else
          slnc.slncfile = tex.jobname
        end
        slnc.slncfile = slnc.slncfile .. '.slnc'
      }%
      \xdef\slnc@mdfivesum{\directlua{slnc.mdfivesum(slnc.slncfile)}}%
    \fi
  }{%
    \xdef\slnc@mdfivesum{\mdfivesum file {\jobname.slnc}}%
  }%
}{%
  \xdef\slnc@mdfivesum{\pdfmdfivesum file {\jobname.slnc}}%
}%
%&lt;*trace&gt;
\scr@ifundefinedorrelax{slnc@mdfivesum}{}{%
  \PackageInfo{scrlayer-notecolumn}{%
    MD5 of last `\jobname.slnc':\MessageBreak
    \slnc@mdfivesum}%
}%
%&lt;/trace&gt;
\newread\slnc@file
\immediate\openin\slnc@file \jobname.slnc
%&lt;/body&gt;
%    \end{macrocode}
% \end{macro}^^A \slnc@mdfivesum
% \end{macro}^^A \slnc@file
% \end{macro}^^A \slnc@unprocessed
% \end{macro}^^A \slnc@processnotes
%
% \begin{option}{autoclearnotecolumns}
% \begin{macro}{\ifslnc@autoclearnotecolumns,\slnc@autoclearnotecolumnstrue,
%               \slnc@autoclearnotecolumnsfalse}
%    \begin{macrocode}
%&lt;*options&gt;
\KOMA@ifkey{autoclearnotecolumns}{slnc@autoclearnotecolumns}
\slnc@autoclearnotecolumnstrue
%&lt;/options&gt;
%&lt;*final&gt;
\let\reserved@a\clearpage
\def\clearpage{%
  \ifslnc@autoclearnotecolumns\clearnotecolumns\relax\fi
}%
\expandafter\g@addto@macro\expandafter\clearpage\expandafter{\reserved@a}
%&lt;/final&gt;
%    \end{macrocode}
% \end{macro}
% \end{option}
%
% \begin{command}{\clearnotecolumn}
% \begin{description}
% \item[\oarg{string}:] the name of the note column (must be fully
%   expandable and expand to a string only). Default is |marginpar|.
% \end{description}
% Output as many (empty) pages as needed to output all unprocessed notes of
% one note column. Note, that the output of the first page may result in more
% unprocessed notes. But the output of the following (empty) pages shouldn't.
%    \begin{macrocode}
%&lt;*body&gt;
\newcounter{slnc@clearnote@label}%
\newcommand*\clearnotecolumn[1][marginpar]{%
  \begingroup
    \slnc@autoclearnotecolumnsfalse
%    \end{macrocode}
% First of all we need to know the note column page of this page.
%    \begin{macrocode}
    \stepcounter{slnc@clearnote@label}%
    \if@filesw
      \protected@write\@auxout{%
        \let\theslncpage\relax
        \let\slnc@voidtest\relax
      }{%
        \string\newlabel{notecolumn.\theslnc@clearnote@label}%
        {{\theslncpage}{\slnc@voidtest{#1}}}%
      }%
    \fi
    \scr@ifundefinedorrelax{r@notecolumn.\theslnc@clearnote@label}{%
      \PackageInfo{scrlayer-notecolumn}{%
        Using estimated to low value for clearing\MessageBreak
        note colum `#1'%
      }
      \edef\slnc@cmp@value{\the\value{slncpage}}%
      \let\reserved@a\z@
    }{%
      \edef\reserved@a{%
        \@nameuse{r@notecolumn.\theslnc@clearnote@label}\@empty\@empty
      }%
      \edef\slnc@cmp@value{\expandafter\slnc@firstof\reserved@a\@nil}%
      \edef\reserved@a{\expandafter\slnc@secondof\reserved@a\@nil}%
    }%
%&lt;*trace&gt;
    \PackageInfo{scrlayer-notecolumn}{%
      TRACE (slnc): clearnote=\@nameuse{theslnc@clearnote@label},
      abspage=\the\value{slncpage}, until page=\slnc@cmp@value,
      process=\reserved@a, pagetotal=\the\pagetotal, topskip=\the\topskip}%
%&lt;/trace&gt;
    \ifvmode\ifdim \pagetotal&lt;\topskip
%    \end{macrocode}
% \cs{clearpage} wouldn't result in a new page, so we do not have to output
% the notes of this page but only until the previous.
%    \begin{macrocode}
        \edef\slnc@cmp@value{\the\numexpr\slnc@cmp@value-1}%
%&lt;trace&gt;          \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): until page=\slnc@cmp@value}%
    \fi\fi
    \ifnum \reserved@a=\z@
%    \end{macrocode}
% Next we read all notes until the end of the current page, but only
% if a \cs{clearpage} wouldn't result in a new page.
%    \begin{macrocode}
      \ifvmode
        \ifdim \pagetotal&lt;\topskip
        \else
          \slnc@readnotes{\slnc@cmp@value}%
        \fi
      \else
        \slnc@readnotes{\slnc@cmp@value}%
      \fi
      \begingroup
        \aftergroup\@tempswafalse
        \long\def\slnc@note##1##2##3##4{%
          \ifnum ##2&gt;\slnc@cmp@value\relax \else \aftergroup\@tempswatrue\fi
        }%
        \let\slnc@sync\slnc@note
        \csname slnc@#1@unprocessed\endcsname
      \endgroup
    \else
      \PackageInfo{scrlayer-notecolumn}{%
        box of note column `#1'\MessageBreak
        not empty after page of \string\clearnotecolumn}%
      \@tempswatrue
    \fi
    \if@tempswa
%    \end{macrocode}
% Yes, we have!
%    \begin{macrocode}
      \IfLayerPageStyleExists{\currentpagestyle}{}{%
        \PackageWarning{scrlayer-notecolumn}{%
          \string\clearnotecolumn\space while active non-layer page
          style.\MessageBreak
          Activate empty page style until note column\MessageBreak
          has been cleared%
        }%
        \pagestyle{empty}%
      }%
      \@tempswatrue
    \fi
    \@whilesw\if@tempswa\fi{%
%&lt;trace&gt;    \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): add \string\clearpage}%
%    \end{macrocode}
% Yes, we have (maybe again)!
%    \begin{macrocode}
      \clearpage
      \expandafter\ifcase \slnc@voidtest{#1}%
        \begingroup
          \aftergroup\@tempswafalse
          \long\def\slnc@note##1##2##3##4{%
            \ifnum ##2&gt;\slnc@cmp@value\relax \else \aftergroup\@tempswatrue\fi
          }%
          \let\slnc@sync\slnc@note
          \csname slnc@#1@unprocessed\endcsname
        \endgroup
      \else
        \@tempswatrue
      \fi
      \if@tempswa
%    \end{macrocode}
% And we still have: So we have to output one more page.
%    \begin{macrocode}
        \null
      \fi
    }%
  \endgroup
}
%    \end{macrocode}
% \begin{macro}{\slnc@firstof,\slnc@secondof}
% We need these little helpers, because some packages like
% \pkg{hyperref} extend the label mechanism by additional arguments.
%    \begin{macrocode}
\newcommand*{\slnc@firstof}{}
\def\slnc@firstof#1#2\@nil{#1}%
\newcommand*{\slnc@secondof}{}
\def\slnc@secondof#1#2#3\@nil{#2}%
%    \end{macrocode}
% \end{macro}^^A \slnc@firstof,\slnc@secondof
% \begin{macro}{\slnc@voidtest}
% \begin{description}
% \item[\marg{string}:] the name of a note column (must be fully
%   expandable and expand to a string only).
% \end{description}
% If the box of the note column is empty/void it returns \cs{z@} otherwise
% \cs{@ne}.
%    \begin{macrocode}
\newcommand*{\slnc@voidtest}[1]{%
  \expandafter\ifvoid \csname slnc@#1@box\endcsname \z@\else \@ne\fi
}
%&lt;/body&gt;
%    \end{macrocode}
% \end{macro}^^A \slnc@voidtest
% \end{command}^^A \clearnotecolumn
% 
% \begin{command}{\clearnotecolumns}
% \changes{v3.26}{2018/08/29}{\cs{scr@trim@spaces} added}
% \changes{v3.26}{2018/08/29}{removed spurious \cs{expandafter}}
% \begin{description}
% \item[\oarg{string list}:] comma separated list of note column names (must
%   be fully expandable and each element must expand to a string only, that is
%   the name of a note column); if omitted or empty all note columns will be
%   used.
% \end{description}
% Output as many (empty) pages as needed to output all unprocessed notes of
% all (given) note columns. Note, that the output of the first page may
% result in more unprocessed notes. But the output of the following (empty)
% pages shouldn't.
%    \begin{macrocode}
%&lt;*body&gt;
\newcommand*\clearnotecolumns[1][\relax]{%
  \begingroup
    \slnc@autoclearnotecolumnsfalse
    \ifx\relax#1\relax\else
      \let\slnc@processnotecolumns\@empty
      \edef\reserved@a{#1}%
      \@for\reserved@a:=\reserved@a\do {%
        \scr@trim@spaces\reserved@a
        \ifx\reserved@a\@empty\else
          \expandafter\l@addto@macro\expandafter\slnc@processnotecolumns
          \expandafter{\expandafter\@elt\expandafter{\reserved@a}}%
        \fi
      }%
    \fi
%    \end{macrocode}
% First of all we need to know the note column page of this page.
%    \begin{macrocode}
    \stepcounter{slnc@clearnote@label}%
    \if@filesw
      \begingroup
        \def\@elt##1{+\slnc@voidtest{##1}}%
        \protected@write\@auxout{%
          \let\theslncpage\relax
          \let\slnc@voidtest\relax
        }{%
          \string\newlabel{notecolumn.\theslnc@clearnote@label}%
          {{\theslncpage}{\numexpr \slnc@processnotecolumns\relax}}%
        }%
      \endgroup
    \fi
    \scr@ifundefinedorrelax{r@notecolumn.\theslnc@clearnote@label}{%
      \begingroup
        \def\@elt##1{, `##1'}%
        \PackageInfo{scrlayer-notecolumn}{%
          Using estimated to low value for\MessageBreak
          clearing note colums\MessageBreak
          \expandafter\@gobble\slnc@processnotecolumns
        }%
      \endgroup
      \edef\slnc@cmp@value{\the\value{slncpage}}%
      \let\reserved@a\z@
    }{%
      \edef\reserved@a{%
        \@nameuse{r@notecolumn.\theslnc@clearnote@label}\@empty\@empty
      }%
      \edef\slnc@cmp@value{\expandafter\slnc@firstof\reserved@a\@nil}%
      \edef\reserved@a{\expandafter\slnc@secondof\reserved@a\@nil}%
    }%
%&lt;*trace&gt;
    \PackageInfo{scrlayer-notecolumn}{%
      TRACE (slnc): clearnote=\@nameuse{theslnc@clearnote@label},
      abspage=\theslncpage, until page=\slnc@cmp@value,
      process=\reserved@a, pagetotal=\the\pagetotal, topskip=\the\topskip}%
%&lt;/trace&gt;
    \ifvmode\ifdim \pagetotal&lt;\topskip
%    \end{macrocode}
% \cs{clearpage} wouldn't result in a new page, so we do not have to output
% the notes of this page but only until the previous.
%    \begin{macrocode}
        \edef\slnc@cmp@value{\the\numexpr\slnc@cmp@value-1}%
%&lt;trace&gt;          \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): until page=\slnc@cmp@value}%
    \fi\fi
    \ifnum \reserved@a=\z@
%    \end{macrocode}
% Next we read all notes until the end of the current page, but only
% if a \cs{clearpage} wouldn't result in a new page.
%    \begin{macrocode}
      \ifvmode
        \ifdim \pagetotal&lt;\topskip
        \else
          \slnc@readnotes{\slnc@cmp@value}%
        \fi
      \else
        \slnc@readnotes{\slnc@cmp@value}%
      \fi
      \begingroup
        \aftergroup\@tempswafalse
        \long\def\slnc@note##1##2##3##4{%
          \ifnum ##2&gt;\slnc@cmp@value\relax \else \aftergroup\@tempswatrue\fi
        }%
        \let\slnc@sync\slnc@note
        \def\@elt##1{\csname slnc@##1@unprocessed\endcsname}%
        \slnc@processnotecolumns
      \endgroup
    \else
      \PackageInfo{scrlayer-notecolumn}{%
        box of at least one note column\MessageBreak
        not empty after page of \string\clearnotecolumns}%
      \@tempswatrue
    \fi
    \if@tempswa
%    \end{macrocode}
% Yes, we have!
%    \begin{macrocode}
      \IfLayerPageStyleExists{\currentpagestyle}{}{%
        \PackageWarning{scrlayer-notecolumn}{%
          \string\clearnotecolumns\space while active non-layer page
          style.\MessageBreak
          Activate empty page style until note column\MessageBreak
          has been cleared%
        }%
        \pagestyle{empty}%
      }%
      \@tempswatrue
    \fi
    \@whilesw\if@tempswa\fi{%
%&lt;trace&gt;    \PackageInfo{scrlayer-notecolumn}{TRACE (slnc): adding \string\clearpage}%
%    \end{macrocode}
% Yes, we have (maybe again)!
%    \begin{macrocode}
      \clearpage
      \begingroup
        \def\@elt##1{+\slnc@voidtest{##1}}%
        \ifcase \numexpr \slnc@processnotecolumns\relax
          \aftergroup\@tempswafalse
          \long\def\slnc@note##1##2##3##4{%
            \ifnum ##2&gt;\slnc@cmp@value\relax \else \aftergroup\@tempswatrue\fi
          }%
          \let\slnc@sync\slnc@note
          \def\@elt##1{\csname slnc@##1@unprocessed\endcsname}%
          \slnc@processnotecolumns
        \else
          \aftergroup\@tempswatrue
        \fi
      \endgroup
      \if@tempswa
%    \end{macrocode}
% And we still have: So we have to output one more page.
%    \begin{macrocode}
        \null
      \fi
    }%
  \endgroup
}
%&lt;/body&gt;
%    \end{macrocode}
% \end{command}^^A \clearnotecolumns
%
%
% \subsection{Syncronisation of text and note}
% \label{sec:scrlayer-notecolumn.sync}
%
% Until yet we have the text and we have note columns. Normally note entries
% to a note column are in sync with the text position, that makes the
% note. But if there are collisions the sync may be lost. In this case the
% note may be later (but never earlier), so we need a mechanism to force
% synchronisation of the text with the note.
%
% \begin{command}{\syncwithnotecolumn,\syncwithnotecolumns}
% \changes{v3.26}{2018/08/29}{\cs{scr@trim@spaces} added}
% \changes{v3.26}{2018/08/29}{removed spurious \cs{expandafter}}
% \begin{description}
% \item[\oarg{string}:] the name of the note column to sync with (this must be
%   fully expandable and expand to the name of a note column). By default sync
%   with note column |marginpar|.
% \end{description}
% \begin{counter}{slnc@syncpoint}
% Add at the \LaTeX{} run after the next \LaTeX{} run as much space to the
% text (not the note column!) as needed to reach the next position at the
% note column. This is not the same like \cs{clearnotecolumn}, because it
% doesn't need to go to the next page, but it needs at least three \LaTeX{}
% runs to terminate.
%    \begin{macrocode}
%&lt;*body&gt;
\newcounter{slnc@syncpoint}%
\newcommand*{\syncwithnotecolumn}[1][marginpar]{%
  \begingroup
    \edef\reserved@a{\endgroup\noexpand\syncwithnotecolumns[{#1}]}%
  \reserved@a
}
\newcommand*{\syncwithnotecolumns}[1][\relax]{%
  \begingroup
    \ifx\relax#1\relax\else
      \let\slnc@processnotecolumns\@empty
      \edef\reserved@a{#1}%
      \@for\reserved@a:=\reserved@a\do {%
        \scr@trim@spaces\reserved@a
        \ifx\reserved@a\@empty\else
          \expandafter\l@addto@macro\expandafter\slnc@processnotecolumns
          \expandafter{\expandafter\@elt\expandafter{\reserved@a}}%
        \fi
      }%
    \fi
    \stepcounter{slnc@syncpoint}%
    \def\@elt##1{%
      \addtocontents{slnc}{%
        \string\slnc@sync{##1}%
                         {\noexpand\number\value{slncpage}}%
                         {\theslnc@syncpoint}%
                         {}%
      }%
    }%
    \slnc@processnotecolumns
    \ifvmode
      \let\slnc@voffset\@empty%
      \expandafter\@firstofone
    \else
      \PackageWarning{scrlayer-notecolumn}{%
        \string\syncwithnotecolumn\space in hmode.\MessageBreak
        Using \string\syncwithnotecolumn\space in horizontal\MessageBreak
        mode may result in unwanted vertical\MessageBreak
        space inside paragraphs and may lost\MessageBreak
        colors of text of notes. \space So perhaps you\MessageBreak
        should move \string\syncwithnotecolumn\space before\MessageBreak
        or after the paragraph%
      }%
      \let\slnc@voffset\@empty%\def\slnc@voffset{-\number\baselineskip}%
      \expandafter\slnc@vadjust
    \fi
    {%
      \if@filesw
        \scr@savepos
        \protected@write\@auxout{}{%
          \string\newlabel{notecolumn.\theslnc@syncpoint.synctext.label}{%
            {%
              \noexpand\number
              \numexpr \scr@lastypos\slnc@voffset\relax
            }{\thepage}%
          }%
        }%
      \fi
      \@ifundefined{r@notecolumn.\theslnc@syncpoint.synctext.label}{%
        \PackageInfo{scrlayer-notecolumn}{%
          No text label for \string\syncwithnotecolumn.\MessageBreak
          Need rerun to sync position}%
      }{%
        \edef\reserved@a{%
          \@nameuse{r@notecolumn.\theslnc@syncpoint.synctext.label}%
          \@empty\@empty
        }%
        \edef\slnc@textpos{\expandafter\slnc@firstof\reserved@a\@nil}%
        \edef\slnc@textpage{\expandafter\slnc@secondof\reserved@a\@nil}%
        \let\slnc@notepos\slnc@textpos
        \let\slnc@notepage\slnc@textpage
        \def\@elt##1{%
          \@ifundefined{r@notecolumn.##1.\theslnc@syncpoint.syncnote.label}{%
            \PackageInfo{scrlayer-notecolumn}{%
              No note label for sync with note column\MessageBreak
              `##1'.\MessageBreak
              Need rerun to sync position}%
            \G@refundefinedtrue
          }{%
            \edef\reserved@a{%
              \@nameuse{r@notecolumn.##1.\theslnc@syncpoint.syncnote.label}%
              \@empty\@empty
            }%
            \edef\reserved@b{\expandafter\slnc@firstof\reserved@a\@nil}%
            \edef\reserved@c{\expandafter\slnc@secondof\reserved@a\@nil}%
            \ifnum \slnc@notepage&lt;\reserved@c\relax
              \let\slnc@notepos=\reserved@b
              \let\slnc@notepage=\reserved@c
            \else
              \ifnum \slnc@notepage=\reserved@c\relax
                \ifnum \slnc@notepos&gt;\reserved@b
                  \let\slnc@notepos=\reserved@b
                  \let\slnc@notepage=\reserved@c
                \fi
              \fi
            \fi
          }%
        }%
        \slnc@processnotecolumns
        \ifnum\slnc@textpage&gt;\slnc@notepage\relax
          \PackageInfo{scrlayer-notecolumn}{%
            Last note page before last text page.\MessageBreak
            Need rerun to sync position}%
        \else
          \ifnum\slnc@textpage&lt;\slnc@notepage\relax
           \@whilenum \slnc@textpage&lt;\slnc@notepage\do {%
             \newpage\null\vskip-\dimexpr \baselineskip+\parskip\relax
              \edef\slnc@textpage{\the\numexpr\slnc@textpage+1\relax}%
            }%
%    \end{macrocode}
% \changes{v0.1}{2015/10/07}{ready for renaming \cs{pdfpageheight} in
%   luaTeX}
% From lua\TeX~0.80.1 \cs{pdfpageheight} will be renamed into
% \cs{pageheight}. So we have to do an extra test for the new primitive.
%    \begin{macrocode}
            \scr@ifundefinedorrelax{pdfpageheight}{%
              \scr@ifundefinedorrelax{pageheight}{%
                \@tempdima=\paperheight
              }{%
                \@tempdima=\pageheight
              }%
            }{%
              \@tempdima=\pdfpageheight
            }%
            \@tempdima=\dimexpr \@tempdima
                               -\topmargin-1in
                               -\headheight-\headsep
                               -\topskip+\baselineskip
                               \relax
            \edef\slnc@textpos{\number\@tempdima}%
%&lt;*trace&gt;
            \PackageInfo{scrlayer-notecolumn}{%
              Top position is \slnc@textpos%
            }%
%&lt;/trace&gt;
          \fi
          \ifnum\slnc@notepos&gt;\slnc@textpos\relax
            \PackageInfo{scrlayer-notecolumn}{%
              Last note position before last text\MessageBreak
              position.\MessageBreak
              Need rerun to sync position%
            }%
          \else
            \ifnum\slnc@notepos&lt;\slnc@textpos\relax
              \@tempdima=\numexpr \slnc@textpos-\slnc@notepos\relax sp
              \PackageInfo{scrlayer-notecolumn}{%
                skipping \the\@tempdima\space to sync%
              }%
              \vskip\@tempdima
            \fi
          \fi
        \fi
      }%
    }%
  \endgroup
}
%    \end{macrocode}
% \end{counter}
% \begin{macro}{\slnc@vadjust}
%    \begin{macrocode}
\newcommand{\slnc@vadjust}[1]{%
  \@bsphack
  \vadjust{#1}%
  \@esphack
}
%&lt;/body&gt;
%    \end{macrocode}
% \end{macro}^^A \slnc@vadjust
% \end{command}^^A \syncwithnotecolumn,\syncwithnotecolumns
% 
%
%    \begin{macrocode}
%&lt;/interface&gt;
%    \end{macrocode}
%
% \Finale
% \PrintChanges
%
\endinput
% Local Variables:
% mode: doctex
% ispell-local-dictionary: "en_US"
% eval: (flyspell-mode 1)
% TeX-master: t
% TeX-engine: luatex-dev
% eval: (setcar (or (cl-member "Index" (setq-local TeX-command-list (copy-alist TeX-command-list)) :key #'car :test #'string-equal) (setq-local TeX-command-list (cons nil TeX-command-list))) '("Index" "mkindex %s" TeX-run-index nil t :help "makeindex for dtx"))
% End:
</pre></body></html>