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Binding correction compatibility #312

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Binding correction compatibility #312

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8f58ce9
Implement compatibility with binding correction (BCOR)
GenieTim Jan 27, 2026
ac614a3
Document the BCOR option
GenieTim Jan 27, 2026
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6 changes: 6 additions & 0 deletions examples/documentation/chapters/options.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,12 @@ \section{\Class{KOMA} Options}
they are separated by half a line worth of space: the \Option{parskip}
value is \enquote{half}.} not marked by indentation.

The \KOMAScript\xspace option \Option{BCOR} (binding correction) is supported;
its value is forwarded to \Package{geometry} as a binding offset so that
inner margins are enlarged automatically. For example,
\lstinline|\documentclass[BCOR=8mm]{kaobook}| adds an 8\,mm correction to
the inner margin.

\section{\Class{kao} Options}

In the future I plan to add more options to set the paragraph formatting
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17 changes: 17 additions & 0 deletions kao.sty
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Expand Up @@ -166,12 +166,27 @@
\@ifclasswith{\@baseclass}{a4paperlandscape}{\setlength{\hscale}{1.414mm}\setlength{\vscale}{0.707mm}}{}
\@ifclasswith{\@baseclass}{169paperlandscape}{\setlength{\hscale}{1.414mm}\setlength{\vscale}{0.562mm}}{}

% Create a length to store the binding correction from KOMAScript
\newlength{\kao@bcor}
\setlength{\kao@bcor}{0pt}

% Set the default page layout
\RequirePackage[
paperwidth=210\hscale,
paperheight=297\vscale,
]{geometry}

% Extract BCOR value from KOMAScript immediately after geometry is loaded
% This must happen before any \newgeometry calls
% Use ta@bcor which is KOMAScript's internal register for BCOR
\AtEndPreamble{%
\@ifundefined{ta@bcor}{%
\setlength{\kao@bcor}{0pt}%
}{%
\setlength{\kao@bcor}{\ta@bcor}%
}%
}

% Command to choose among the three possible layouts
\DeclareDocumentCommand{\pagelayout}{m}{%
\ifthenelse{\equal{margin}{#1}}{\marginlayout\marginfloatsetup}{}%
Expand All @@ -191,6 +206,7 @@
% Layout #1: large margins
\newcommand{\marginlayout}{%
\newgeometry{
bindingoffset=\kao@bcor,
top=27.4\vscale,
bottom=27.4\vscale,
inner=24.8\hscale,
Expand All @@ -205,6 +221,7 @@
% Layout #2: small, symmetric margins
\newcommand{\widelayout}{%
\newgeometry{
bindingoffset=\kao@bcor,
top=27.4\vscale,
bottom=27.4\vscale,
inner=24.8\hscale,
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