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% (The MIT License)
%
% Copyright (c) 2021 Yegor Bugayenko
%
% Permission is hereby granted, free of charge, to any person obtaining a copy
% of this software and associated documentation files (the 'Software'), to deal
% in the Software without restriction, including without limitation the rights
% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
% copies of the Software, and to permit persons to whom the Software is
% furnished to do so, subject to the following conditions:
%
% The above copyright notice and this permission notice shall be included in all
% copies or substantial portions of the Software.
%
% THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
% SOFTWARE.
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{crumbs}[2021/09/13 0.3.1 Navigation Crumbs]
\RequirePackage{xkeyval}
\RequirePackage{etoolbox}
\makeatletter\newif\ifcrumbs@dry\makeatother
\makeatletter\DeclareOption{dry}{\crumbs@drytrue}\makeatother
\makeatletter\newif\ifcrumbs@increment\makeatother
\makeatletter\DeclareOption{increment}{\crumbs@incrementtrue}\makeatother
\ProcessOptions\relax
% see https://tex.stackexchange.com/a/12414/1449
\makeatletter\newcommand\crumbs@back{\@backslashchar}\makeatother
% \makeatletter\newcommand\crumbs@percent{\@percentchar}\makeatother
\RequirePackage{catchfile}
\newwrite\appendwrite
\newcommand*\appendtofile[2]{%
\begingroup
\IfFileExists{#1}%
{\CatchFileDef{\filecontent}{#1}{\endlinechar=`^^J\catcode\endlinechar=12\relax}}% keep existing end-of-lines
{\let\filecontent\empty}%
\immediate\openout\appendwrite=#1\relax
\immediate\write\appendwrite{\unexpanded\expandafter{\filecontent} #2}%
\immediate\closeout\appendwrite
\endgroup
}
\newcommand\subcrumbs{%
\ifnum\value{section}=0\else%
\expandafter\ifcsname crumbs\romannumeral\the\value{section}\endcsname%
\csname crumbs\romannumeral\the\value{section}\endcsname{}%
\fi%
\fi%
}
\makeatletter\newcommand\crumbection[2][]{%
\def\temp{#1}%
\ifx\crumbs\empty%
\appendtofile{\jobname.crumbs}{%
\crumbs@back ifx\crumbs@back crumbs\crumbs@back empty%
\crumbs@back gappto\crumbs@back crumbs{\crumbs@back setcounter{crumbi}{0}}%
\crumbs@back fi%
\crumbs@back gappto\crumbs@back crumbs{\crumbs@back stepcounter{crumbi}\crumbs@back crumb{\ifx\temp\empty #2\else #1\fi}{#2}}%
}%
\fi%
\ifcrumbs@increment\stepcounter{section}\fi%
}\makeatother
\makeatletter\newcommand\subcrumbection[2][]{%
\def\temp{#1}%
\ifx\crumbs\empty%
\appendtofile{\jobname.crumbs}{%
\crumbs@back ifcsname crumbs\romannumeral\the\value{section}\crumbs@back endcsname\crumbs@back else
\crumbs@back expandafter\crumbs@back newcommand\crumbs@back csname crumbs\romannumeral\the\value{section}\crumbs@back endcsname{%
\crumbs@back setcounter{subcrumbi}{0}%
}%
\crumbs@back fi%
\crumbs@back expandafter\crumbs@back gappto\crumbs@back csname crumbs\romannumeral\the\value{section}\crumbs@back endcsname{%
\crumbs@back stepcounter{subcrumbi}%
\crumbs@back subcrumb{\ifx\temp\empty #2\else #1\fi}{#2}}%
}%
\fi%
\ifcrumbs@increment\stepcounter{subsection}\fi%
}\makeatother
\makeatletter\ifcrumbs@dry%
\message{Since "dry" mode is ON we don't renew "section" and "subsection" commands}%
\else%
\NewCommandCopy\crumbs@oldsection\section
\renewcommand\section[2][]{%
\crumbection[#1]{#2}%
\crumbs@oldsection{#2}%
}
\NewCommandCopy\crumbs@oldsubsection\subsection
\renewcommand\subsection[2][]{%
\subcrumbection[#1]{#2}%
\crumbs@oldsubsection{#2}%
}
\fi\makeatletter
\ifcsname crumb\endcsname%
\message{The command "crumb" is already defined}%
\else%
\newcommand\crumb[2]{#1}%
\fi%
\ifcsname subcrumb\endcsname%
\message{The command "subcrumb" is already defined}%
\else%
\newcommand\subcrumb[2]{#1}%
\fi%
\newcommand*\crumbs{}
\newcounter{crumbi}
\newcounter{subcrumbi}
\AtBeginDocument{\IfFileExists{\jobname.crumbs}{\input{\jobname.crumbs}}{}}
\endinput
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