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% \iffalse meta-comment
%
% Copyright (C) 2021 by Jinwen XU 
% -------------------------------
% 
% This file may be distributed and/or modified under the conditions of the LaTeX
% Project Public License, either version 1.3 of this license or (at your option)
% any later version. The latest version of this license is in:
%
%    http://www.latex-project.org/lppl.txt
%
% and version 1.3 or later is part of all distributions of LaTeX version
% 2005/12/01 or later.
%
% \fi
%
% \iffalse
%<*driver>
\ProvidesFile{mindflow.dtx}
%</driver>
%<package>\NeedsTeXFormat{LaTeX2e}
%<package>\ProvidesPackage{mindflow}
%<*package>
    [2021/03/09 Mindflow environment]
%</package>
%
%<*driver>
\documentclass{article}
\usepackage{doc}
\usepackage[a4paper,margin=1.8in]{geometry}
\usepackage{titling}
\setlength{\droptitle}{-.5in}
\usepackage[linenumber,rightmarker]{mindflow}
\usepackage{enumitem}
\setlist{noitemsep}
\usepackage{newpxtext}
\usepackage{parskip}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\begin{document}
  \DocInput{mindflow.dtx}
\end{document}
%</driver>
% \fi
%
% \CheckSum{0}
%
% \GetFileInfo{mindflow.dtx}
%
%
% \title{The {\normalfont\textsf{mindflow}} package}
% \author{\scshape Jinwen Xu}
% \date{\filedate}
%
% \maketitle
%
% \section{Introduction}
%
% The \textsf{mindflow} package provides you a way to write your ideas,
% annotations or writing plans. For example (with option
% \verb|linenumber| and \verb|rightmarker|):
% \begin{mindflow}
%     What to write next:
%     \begin{itemize}
%         \item usage;
%         \item some internal macros;
%         \item the complete code.
%     \end{itemize}
% \end{mindflow}
%
% \section{Usage}
%
% Simply load the package with \verb|\usepackage{mindflow}|. By default
% it has no line numbers or markers. You can use the following options:
%
% \begin{tabular}{ll}
%     \verb|linenumber| & Enable line numbers\\
%     \verb|leftmarker| & Enable left marker, by default it is a ``\verb|*|''\\
%     \verb|rightmarker| & Enable right marker, by default it is a ``\verb|*|''\\
%     \verb|off| & Hide all the \verb|mindflow| environments
% \end{tabular}
%
% \DescribeEnv{mindflow}
% Then you can use the mindflow environment as
% \begin{verbatim}
%   \begin{mindflow}
%       ...
%   \end{mindflow}
% \end{verbatim}
%
% \section{Some technical details}
%
% \DescribeMacro{\mindflowFont}
% \DescribeMacro{\mindflowNumFont}
% The font for texts and line numbers within the \verb|mindflow|
% environments can be specified by redefining \verb|\mindflowFont| and
% \verb|\mindflowNumFont|. By default they are defined as:
% \begin{verbatim}
%   \newcommand{\mindflowFont}{\normalfont\footnotesize}
%   \newcommand{\mindflowNumFont}{\normalfont\scriptsize\ttfamily}
% \end{verbatim}
% \DescribeMacro{\mindflowLeft}
% \DescribeMacro{\mindflowRight}
% The left and right marker can be changed by redefining
% \verb|\mindflowLeft| and \verb|\mindflowRight|. Both have the default
% value as ``\verb|*|''.
%
% And finally, the color of \verb|mindflow| environments is called
% \verb|mindflow|. By default, it is the current text color with opacity
% 30\%.
%
% \StopEventually{}
%
% \section{Implementation}
% Below is the complete source code of this package.
%
%    \begin{macrocode}
\RequirePackage{kvoptions}
\SetupKeyvalOptions{%
    family = @mindflow,
    prefix = @mindflow@
}
\DeclareBoolOption[false]{off}           % Turn off mindflow
\DeclareBoolOption[false]{leftmarker}    % Left marker
\DeclareBoolOption[false]{rightmarker}   % Right marker
\DeclareBoolOption[false]{linenumber}    % Line numbers

\ProcessKeyvalOptions*\relax

%%================================
%% Initialization
%%================================
\newcommand{\mindflowFont}{\normalfont\footnotesize}
\newcommand{\mindflowNumFont}{\normalfont\scriptsize\ttfamily}

\RequirePackage{lineno}
\RequirePackage{xcolor}

\colorlet{mfSavedColor}{.}
\colorlet{mindflow}{mfSavedColor!30}

\newcommand{\mindflowLeft}{%
  \if@mindflow@leftmarker%
    {*}%
  \fi%
}
\newcommand{\mindflowRight}{%
  \if@mindflow@rightmarker%
    {*}%
  \fi%
}

%%================================
%% The mindflow environment
%%================================
\newif\ifLNturnsON

\newcommand*{\mfSepLine}{%
  \parskip=0pt
  \LNturnsONfalse%
  \ifLineNumbers\LNturnsONtrue\fi\nolinenumbers%
  \par\noindent\nopagebreak%
  \makebox[\linewidth]{\rule{\paperwidth}{0.4pt}}%
  \nopagebreak\par%
  \ifLNturnsON\linenumbers\fi%
}

\newcounter{recordLN}
\newcounter{mfLN}
\setcounter{mfLN}{1}

\if@mindflow@off
  \RequirePackage{verbatim}
  \let\mindflow=\comment
  \let\endmindflow=\endcomment
\else
  \newenvironment{mindflow}
  {%
    \setcounter{recordLN}{\value{linenumber}}
    \setcounter{linenumber}{\value{mfLN}}
    \LNturnsONfalse%
    \ifLineNumbers\LNturnsONtrue\fi\nolinenumbers%
    \mindflowFont\color{mindflow}%
    \mfSepLine%
    \linenumbers%
    \renewcommand\makeLineNumber{%
      \hss\color{mindflow!25}%
      \if@mindflow@linenumber%
      \mindflowNumFont\LineNumber~%
      \fi%
      \mindflowLeft\hspace{1em}\rlap{\hskip\textwidth\hspace{1em}\mindflowRight}%
    }%
  }
  {%
    \par%
    \vspace{-.5\baselineskip}\mfSepLine%
    \ifLNturnsON\linenumbers\fi%
    \setcounter{mfLN}{\value{linenumber}}
    \setcounter{linenumber}{\value{recordLN}}
  }
\fi
%    \end{macrocode}
%
% \Finale
\endinput