Create custom latex class

cours.cls

+\NeedsTeXFormat{LaTeX2e}
+\ProvidesClass{cours}[2019/01/09 LaTeX class for Lessons]
+\makeatletter
+% Base Class
+
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{book}}
+
+
+\ProcessOptions\relax
+% Main packages
+
+\LoadClass[12pt,a4paper,french,titlepage]{book}
+
+
+\RequirePackage[french]{babel} % pour ecrire en francais
+\RequirePackage[left=2.00cm, right=2.00cm, top=3.00cm, bottom=3.00cm]{geometry} % la mise en page
+
+% Packages
+\RequirePackage[utf8]{inputenc} % encodage
+
+\RequirePackage{fancyhdr} % la mise en page
+\RequirePackage[dvipsnames,x11names]{xcolor} % Un peu de couleur !
+\RequirePackage{float}
+\RequirePackage{subcaption}
+\RequirePackage{subfiles}
+
+\RequirePackage{hyperref}
+\hypersetup{
+    bookmarks=true,          % show bookmarks bar?
+    unicode=true,            % non-Latin characters in Acrobat’s bookmarks
+    pdftoolbar=true,         % show Acrobat’s toolbar?
+    pdfmenubar=true,         % show Acrobat’s menu?
+    pdffitwindow=false,      % window fit to page when opened
+    pdfstartview={FitH},     % fits the width of the page to the window
+    pdftitle=\@title,      % title
+    pdfauthor=\@author,    % author
+    colorlinks=true,         % false: boxed links; true: colored links
+    linkcolor=black,      % color of internal links
+    citecolor=OliveGreen,    % color of links to bibliography
+    filecolor=magenta,       % color of file links
+    urlcolor=BlueViolet      % color of external links
+}
+
+
+
+\RequirePackage{tikz}
+\usetikzlibrary{fit}
+\usetikzlibrary{positioning}
+\RequirePackage{schemabloc}
+\RequirePackage{circuitikz}
+\RequirePackage{pgfplots}
+\RequirePackage{mathtools}
+\RequirePackage{amsfonts}
+\RequirePackage{mathrsfs}
+\RequirePackage{amssymb}
+\RequirePackage[section]{placeins} % Oblige a placer toutes les figures avant de passer a la section suivante
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%% Custom title Page %%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\teacher#1{\gdef\@teacher{#1}}
+\def\module#1{\gdef\@module{#1}}
+
+\renewcommand{\maketitle}{%
+  \begin{titlepage}
+		\centering
+		{\huge \textsc{M1 E3A - Voie André Ampère}}
+		\vspace{1cm}
+        % \includegraphics[height=4cm]{Saphire} \\
+        \vfill
+        \@ifundefined{@module}
+        {}
+        {%
+        {\LARGE \textsc{Module \@module}}\\
+        }
+        \vspace{1cm}\vfill
+        \@ifundefined{@title}
+        {}
+ 		{{\Huge \textbf{\@title}}}
+ 		\vfill
+        \@ifundefined{@author}
+        {}{%
+          {\Large
+            \underline{Un cours de :}\\ \vspace{1em}
+            \textsc{\@teacher} \\ \vspace{0.5cm}
+            \underline{Rédigé et complété par :} \\ \vspace{1em}
+            \textsc{\@author}}
+ 		\vfill}
+        \@ifundefined\@date{}{%
+ 		{\LARGE Version du \@date}
+ 		\vfill}
+%       \includegraphics[width=6cm]{ENSPS}
+%		\hfill
+%		\includegraphics[width=6cm]{UPS}
+	\end{titlepage}}
+
+% pas de début de section dans la moitié inférieure d'une page
+
+  \RequirePackage{needspace}
+
+  \renewcommand{\section}{
+    \needspace{0.3\textheight}%
+    \@startsection {section}{1}{\z@}%
+	{-3.5ex \@plus -1ex \@minus -.2ex}%
+	{2.3ex \@plus.2ex}%
+	{\reset@font\Large\bfseries}}
+\raggedbottom
+
+\setcounter{secnumdepth}{3}
+\renewcommand{\thesection}{\arabic{section}}
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%% BOITES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+
+\RequirePackage{tikz,environ}
+\tikzstyle{mybox} = [draw=black, very thick,
+    rectangle, inner sep=10pt, inner ysep=20pt]
+\tikzstyle{fancytitle} = [draw=black, fill=white, text=black]
+
+\NewEnviron{defin}{\par
+\begin{center}
+\begin{tikzpicture}
+\node [mybox] (box){%
+    \begin{minipage}{0.8\textwidth}
+    	\BODY
+	\end{minipage} };
+\node[fancytitle, right=10pt] at (box.north west) {\textbf{Définition}};
+\end{tikzpicture}\end{center}\par
+}
+
+% \NewEnviron{thm}{\par
+% \begin{center}
+% \begin{tikzpicture}
+% \node [mybox] (box){%
+%     \begin{minipage}{0.8\textwidth}
+%     	\BODY
+% 	\end{minipage} };
+% \node[fancytitle, right=10pt] at (box.north west) {\textbf{Théorème}};
+% \end{tikzpicture}\end{center}\par
+%}
+
+\RequirePackage{thmbox}
+\RequirePackage{xparse}
+\NewDocumentEnvironment{prop}{o}{%
+\begin{center}\begin{minipage}{0.8\textwidth}
+  \thmbox[M]{\textbf{Proposition \IfNoValueTF{#1}{}{\em (#1)}}}%
+  %\hspace*{-1.5em}%
+  }
+  {%
+  \endthmbox\vspace*{.75ex}\end{minipage}\end{center}%
+  }
+
+\NewDocumentEnvironment{thm}{o}{%
+\begin{center}\begin{minipage}{0.8\textwidth}
+  \thmbox[M]{\textbf{Théorème \IfNoValueTF{#1}{}{\em (#1)}}}%
+  %\hspace*{-1.5em}%
+  }
+  {%
+  \endthmbox\vspace*{.75ex}\end{minipage}\end{center}%
+  }
+
+
+\NewDocumentEnvironment{corol}{o}{%
+	\begin{center}\begin{minipage}{0.8\textwidth}
+			\thmbox[M]{\textbf{Corollaire \IfNoValueTF{#1}{}{\em (#1)}}}%
+			%\hspace*{-1.5em}%
+		}
+		{%
+			\endthmbox\vspace*{.75ex}\end{minipage}\end{center}%
+}
+
+\NewDocumentEnvironment{lemEM}{o}{%
+	\begin{center}\begin{minipage}{0.8\textwidth}
+			\thmbox[M]{\textbf{Lemme ergodique maximal \IfNoValueTF{#1}{}{\em (#1)}}}%
+			%\hspace*{-1.5em}%
+		}
+		{%
+			\endthmbox\vspace*{.75ex}\end{minipage}\end{center}%
+}
+
+\newenvironment{rem}{\par\textbf{Remarque: }\nopagebreak}{\par}
+\newenvironment{exemple}{\par\textbf{Exemple: }\nopagebreak}{\par}
+\newenvironment{preuve}{\par\textit{Démonstration: }\nopagebreak}{\par}