% -*- coding: utf-8 -*-
% SPDX-License-Identifier: GPL-2.0
%
% LaTeX preamble for "make latexdocs" or "make pdfdocs" including:
%   - TOC width settings
%   - Setting of tabulary (\tymin)
%   - Headheight setting for fancyhdr
%   - Fontfamily settings for CJK (Chinese, Japanese, and Korean) translations
%
% Note on the suffix of .sty:
%   This is not implemented as a LaTeX style file, but as a file containing
%   plain LaTeX code to be included into preamble.
%   ".sty" is chosen because ".tex" would cause the build scripts to confuse
%   this file with a LaTeX main file.
%
% Copyright (C) 2022  Akira Yokosawa

% Custom width parameters for TOC --- Redefine low-level commands
% defined in report.cls
\makeatletter
%% Redefine \@pnumwidth (page number width)
\renewcommand*\@pnumwidth{2.7em}
%% Redefine \l@chapter (chapter list entry)
\renewcommand*\l@chapter[2]{%
  \ifnum \c@tocdepth >\m@ne
    \addpenalty{-\@highpenalty}%
    \vskip 1.0em \@plus\p@
    \setlength\@tempdima{1.8em}%
    \begingroup
      \parindent \z@ \rightskip \@pnumwidth
      \parfillskip -\@pnumwidth
      \leavevmode \bfseries
      \advance\leftskip\@tempdima
      \hskip -\leftskip
      #1\nobreak\hfil
      \nobreak\hb@xt@\@pnumwidth{\hss #2%
                                 \kern-\p@\kern\p@}\par
      \penalty\@highpenalty
    \endgroup
  \fi}
%% Redefine \l@section and \l@subsection
\renewcommand*\l@section{\@dottedtocline{1}{1.8em}{3.2em}}
\renewcommand*\l@subsection{\@dottedtocline{2}{5em}{4.3em}}
\makeatother
%% Sphinx < 1.8 doesn't have \sphinxtableofcontentshook
\providecommand{\sphinxtableofcontentshook}{}
%% Undefine it for compatibility with Sphinx 1.7.9
\renewcommand{\sphinxtableofcontentshook}{} % Empty the hook
% Prevent column squeezing of tabulary.
\setlength{\tymin}{20em}

% Adjust \headheight for fancyhdr
\addtolength{\headheight}{1.6pt}
\addtolength{\topmargin}{-1.6pt}

% Translations have Asian (CJK) characters which are only displayed if
% xeCJK is used
\IfFontExistsTF{Noto Sans CJK SC}{
    % This is needed for translations
    \usepackage{xeCJK}
    \IfFontExistsTF{Noto Serif CJK KR}{
	\setCJKmainfont{Noto Serif CJK KR}[AutoFakeSlant]
    }{
	\setCJKmainfont{Noto Sans CJK KR}[AutoFakeSlant]
    }
    \setCJKsansfont{Noto Sans CJK KR}[AutoFakeSlant]
    \setCJKmonofont{Noto Sans Mono CJK KR}[AutoFakeSlant]
    \xeCJKDeclareCharClass{HalfLeft}{`“,`‘}
    \xeCJKDeclareCharClass{HalfRight}{`”,`’}
    % CJK Language-specific font choices
    \IfFontExistsTF{Noto Serif CJK SC}{
	\newCJKfontfamily[SCmain]\scmain{Noto Serif CJK SC}[AutoFakeSlant]
	\newCJKfontfamily[SCserif]\scserif{Noto Serif CJK SC}[AutoFakeSlant]
    }{
	\newCJKfontfamily[SCmain]\scmain{Noto Sans CJK SC}[AutoFakeSlant]
	\newCJKfontfamily[SCserif]\scserif{Noto Sans CJK SC}[AutoFakeSlant]
    }
    \newCJKfontfamily[SCsans]\scsans{Noto Sans CJK SC}[AutoFakeSlant]
    \newCJKfontfamily[SCmono]\scmono{Noto Sans Mono CJK SC}[AutoFakeSlant]
    \IfFontExistsTF{Noto Serif CJK TC}{
	\newCJKfontfamily[TCmain]\tcmain{Noto Serif CJK TC}[AutoFakeSlant]
	\newCJKfontfamily[TCserif]\tcserif{Noto Serif CJK TC}[AutoFakeSlant]
    }{
	\newCJKfontfamily[TCmain]\tcmain{Noto Sans CJK TC}[AutoFakeSlant]
	\newCJKfontfamily[TCserif]\tcserif{Noto Sans CJK TC}[AutoFakeSlant]
    }
    \newCJKfontfamily[TCsans]\tcsans{Noto Sans CJK TC}[AutoFakeSlant]
    \newCJKfontfamily[TCmono]\tcmono{Noto Sans Mono CJK TC}[AutoFakeSlant]
    \IfFontExistsTF{Noto Serif CJK KR}{
	\newCJKfontfamily[KRmain]\krmain{Noto Serif CJK KR}[AutoFakeSlant]
	\newCJKfontfamily[KRserif]\krserif{Noto Serif CJK KR}[AutoFakeSlant]
    }{
	\newCJKfontfamily[KRmain]\krmain{Noto Sans CJK KR}[AutoFakeSlant]
	\newCJKfontfamily[KRserif]\krserif{Noto Sans CJK KR}[AutoFakeSlant]
    }
    \newCJKfontfamily[KRsans]\krsans{Noto Sans CJK KR}[AutoFakeSlant]
    \newCJKfontfamily[KRmono]\krmono{Noto Sans Mono CJK KR}[AutoFakeSlant]
    \IfFontExistsTF{Noto Serif CJK JP}{
	\newCJKfontfamily[JPmain]\jpmain{Noto Serif CJK JP}[AutoFakeSlant]
	\newCJKfontfamily[JPserif]\jpserif{Noto Serif CJK JP}[AutoFakeSlant]
    }{
	\newCJKfontfamily[JPmain]\jpmain{Noto Sans CJK JP}[AutoFakeSlant]
	\newCJKfontfamily[JPserif]\jpserif{Noto Sans CJK JP}[AutoFakeSlant]
    }
    \newCJKfontfamily[JPsans]\jpsans{Noto Sans CJK JP}[AutoFakeSlant]
    \newCJKfontfamily[JPmono]\jpmono{Noto Sans Mono CJK JP}[AutoFakeSlant]
    % Dummy commands for Sphinx < 2.3 (no 'extrapackages' support)
    \providecommand{\onehalfspacing}{}
    \providecommand{\singlespacing}{}
    % Define custom macros to on/off CJK
    \newcommand{\kerneldocCJKon}{\makexeCJKactive\onehalfspacing}
    \newcommand{\kerneldocCJKoff}{\makexeCJKinactive\singlespacing}
    \newcommand{\kerneldocBeginSC}{%
	\begingroup%
	\scmain%
	\xeCJKDeclareCharClass{FullLeft}{`“,`‘}%
	\xeCJKDeclareCharClass{FullRight}{`”,`’}%
	\renewcommand{\CJKrmdefault}{SCserif}%
	\renewcommand{\CJKsfdefault}{SCsans}%
	\renewcommand{\CJKttdefault}{SCmono}%
	\xeCJKsetup{CJKspace = false}%
	% For CJK ascii-art alignment
	\setmonofont{Noto Sans Mono CJK SC}[AutoFakeSlant]%
    }
    \newcommand{\kerneldocEndSC}{\endgroup}
    \newcommand{\kerneldocBeginTC}{%
	\begingroup%
	\tcmain%
	\xeCJKDeclareCharClass{FullLeft}{`“,`‘}%
	\xeCJKDeclareCharClass{FullRight}{`”,`’}%
	\renewcommand{\CJKrmdefault}{TCserif}%
	\renewcommand{\CJKsfdefault}{TCsans}%
	\renewcommand{\CJKttdefault}{TCmono}%
	\xeCJKsetup{CJKspace = false}%
	% For CJK ascii-art alignment
	\setmonofont{Noto Sans Mono CJK TC}[AutoFakeSlant]%
    }
    \newcommand{\kerneldocEndTC}{\endgroup}
    \newcommand{\kerneldocBeginKR}{%
	\begingroup%
	\krmain%
	\renewcommand{\CJKrmdefault}{KRserif}%
	\renewcommand{\CJKsfdefault}{KRsans}%
	\renewcommand{\CJKttdefault}{KRmono}%
	% \xeCJKsetup{CJKspace = true} % true by default
	% For CJK ascii-art alignment (still misaligned for Hangul)
	\setmonofont{Noto Sans Mono CJK KR}[AutoFakeSlant]%
    }
    \newcommand{\kerneldocEndKR}{\endgroup}
    \newcommand{\kerneldocBeginJP}{%
	\begingroup%
	\jpmain%
	\renewcommand{\CJKrmdefault}{JPserif}%
	\renewcommand{\CJKsfdefault}{JPsans}%
	\renewcommand{\CJKttdefault}{JPmono}%
	\xeCJKsetup{CJKspace = false}%
	% For CJK ascii-art alignment
	\setmonofont{Noto Sans Mono CJK JP}[AutoFakeSlant]%
    }
    \newcommand{\kerneldocEndJP}{\endgroup}
    % Single spacing in literal blocks
    \fvset{baselinestretch=1}
    % To customize \sphinxtableofcontents
    \usepackage{etoolbox}
    % Inactivate CJK after tableofcontents
    \apptocmd{\sphinxtableofcontents}{\kerneldocCJKoff}{}{}
    \xeCJKsetup{CJKspace = true} % For inter-phrase space of Korean TOC
}{ % No CJK font found
    % Custom macros to on/off CJK (Dummy)
    \newcommand{\kerneldocCJKon}{}
    \newcommand{\kerneldocCJKoff}{}
    \newcommand{\kerneldocBeginSC}[1]{%
	\begin{sphinxadmonition}{note}{Note:}
	    ``Noto Sans CJK'' fonts are not found while building this PDF\@.
	    Translations of zh\_CN, zh\_TW, ko\_KR, and ja\_JP are skipped.
	\end{sphinxadmonition}}
    \newcommand{\kerneldocEndSC}{}
    \newcommand{\kerneldocBeginTC}[1]{}
    \newcommand{\kerneldocEndTC}{}
    \newcommand{\kerneldocBeginKR}[1]{}
    \newcommand{\kerneldocEndKR}{}
    \newcommand{\kerneldocBeginJP}[1]{}
    \newcommand{\kerneldocEndJP}{}
}
