hw.sty

\ProvidesPackage{hw}

%% Loading packages
\RequirePackage[margin=2.5cm]{geometry}
\RequirePackage{fancyhdr}
\RequirePackage{amsmath}
\RequirePackage{lastpage}
\RequirePackage[T1]{fontenc}
\RequirePackage[utf8]{inputenc}
\RequirePackage{microtype}
\RequirePackage{tikz}
\usetikzlibrary{shadows}

\usepackage{xifthen}

%%Macros
\newcommand*{\rom}[1]{\expandafter\@slowromancap\romannumeral #1@} %% Convert to roman numerals

%%Variables
\newcommand{\classname}{Class name}
\newcommand{\studentname}{Student name}
\newcommand{\teachername}{Teacher name}
\newcommand{\chapternumber}{Chapter \rom{1}}
%% \newcommand{\chapternumber}{1}

%%Counters
\setcounter{secnumdepth}{0} %% No numbers on sections
\newcounter{problemCounter}

%%Environments
\newenvironment{problem}[1][]
{
    \addtocounter{problemCounter}{1}
    
    \ifthenelse{\isempty{#1}}
    {}
    {\setcounter{problemCounter}{#1}}
    
    \section{Problem \theproblemCounter}
}
{}

%%Commands
\renewcommand{\maketitle}{
  \thispagestyle{firstpage}
  \vspace{5em}
  \begin{center}
    \begin{Huge}
      Homework \\ \vspace{1em}
      \textbf{\classname}
    \end{Huge} \\ \vspace{1em}
    \begin{Large}
       \textbf{\studentname}
    \end{Large}

  \end{center}
}

\newcommand{\chapter}{
  \begin{center}
    \begin{Large}
      \hrule
      \vspace{0.5em}
      \textbf{Chapter \chapternumber} 
      \vspace{0.5em}
      \hrule
    \end{Large}
  \end{center}
}

%% Document settings
\linespread{1.5}
\setlength{\headheight}{15pt}
%%%% Header / footer
\fancypagestyle{firstpage}{ %% Only the footer for the first page
%%%%%% Header
\renewcommand{\headrulewidth}{0mm}
\lhead{}
\chead{}
\rhead{}
%%%%%% Footer
\lfoot{\today}
\cfoot{}
\rfoot{Page \thepage\ / \pageref{LastPage}}
}

\pagestyle{fancy}
%%%%%% Header
\lhead{\studentname}
\chead{\textbf{\classname}}
\rhead{\teachername}
%%%%%% Footer
\lfoot{\today}
\cfoot{}
\rfoot{Page \thepage\ / \pageref{LastPage}}
\renewcommand{\footrulewidth}{0.1mm}