fphw/fphw.cls

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% Felipe Portales' HomeWorks
% Maintainer: Felipe Portales-Oliva (f.portales.oliva@gmail.com)
% 
% Document class to produce simple yet stylish homework submissions 
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%%% Identification

\NeedsTeXFormat{LaTeX2e} % we need to have LaTeX2e for this to compile
\ProvidesClass{fphw}[2019/03/19] % fpshw is the name we need to provide to 
                                  % the documentclass command on the .tex file

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%%% Preliminary declarations:
%%%% These are some commands where we declare new commands for the class

% We define the macro for the name of the professor
\newcommand{\professor}[1]{ \renewcommand{\professor}{#1} }
% We define the macro for the name of the course
\newcommand{\class}[1]{ \renewcommand{\class}{#1} }
% We define the macro for the name of the institution
\newcommand{\institute}[1]{ \renewcommand{\institute}{#1} }

%these are auxiliary definitions used in the title section
\newcommand{\CourseLang}{Course}
\newcommand{\DateLang}{Due date}
\newcommand{\StudentLang}{Student name}
\newcommand{\ProfessorLang}{Professor}

% UTF-8 is best coding
\RequirePackage[utf8]{inputenc}

% Header and footers, we will use the titles also
\RequirePackage{fancyhdr}

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%%% Options
%%%% We now pass the options of the class

% Two Columns are difficult to read and grade, we will not use them
\DeclareOption{twocolumn}{\OptionNotUsed}

% Two sided paper are difficult to read and grade, we will not use them
\DeclareOption{twoside}{\OptionNotUsed}


    % we hardcode some language options
\DeclareOption{spanish}{
    \renewcommand{\CourseLang}{Curso}
    \renewcommand{\ProfessorLang}{Docente}
    \renewcommand{\DateLang}{Fecha de entrega}
    \renewcommand{\StudentLang}{Nombre estudiante}
}

\PassOptionsToClass{a4paper}{article}

\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}

\ProcessOptions\relax

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%%% Bulk Declarations
%%%% Here we do more declarations and call other files


% we need to load 
\LoadClass{article}


% we will modify sections, subsections and sub subsections
\RequirePackage{titlesec}
% Modification of section 
\titleformat{\section}[block]{\normalsize\bfseries\filcenter}{\thesection.}{.3cm}{} 

% modification of subsection and sub sub section
\titleformat{\subsection}[runin]{\bfseries}{ \thesubsection.}
{1mm}{}[.\quad]
\titleformat{\subsubsection}[runin]{\bfseries\itshape}{ \thesubsubsection.}
{1mm}{}[.\quad]

% Geometry lets us modify the sizes of the document nicely
\RequirePackage{geometry}
% Decent margins for the documents, as it is meant to be printed
\geometry{left=2.5cm,right=2.5cm,top=2.5cm,bottom=2.5cm}

\fancyhead{}
\fancyfoot{}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0.4pt} % we want rules 
\renewcommand{\footrulewidth}{0.4pt}
\fancyhead[RO] {\footnotesize\thepage}
\fancyhead[LO] {\footnotesize\itshape\class{} -- \makeatletter\@title\makeatother }
\fancyfoot[RO] {\footnotesize\itshape\makeatletter\@author\makeatother}

% New title style for the document
\renewcommand{\maketitle}{%
    \thispagestyle{plain}
    \begin{center}
        {\scshape \institute} \\[10pt]
        \hrule
        \vspace{10pt}
        {\LARGE \bfseries \@title} \\[5pt]
        \StudentLang: {\itshape \@author}
        \vspace{8pt}
        \hrule
        \vspace{10pt}
        \CourseLang: {\itshape\class} -- \ProfessorLang: {\itshape\professor} 
        \\
        \DateLang: {\itshape\@date}
        \vspace{20pt}
    \end{center}
}

% definition of the "problem" environment
\newsavebox{\problembox}
\newenvironment{problem}
    {\begin{center} \begin{lrbox}{\problembox}\begin{minipage}{.98\textwidth}}
    {\end{minipage}\end{lrbox}\fbox{\usebox{\problembox}} \end{center} }

%%% We finish the class with this command
\endinput