metropolis_theme/beamerthemem.sty

% Beamer mtheme
%
% Copyright 2014 Matthias Vogelgesang
% Licensed under CC-BY-SA 4.0 International.
%
% The initial template comes from the HSRM beamer theme by Benjamin Weiss, which
% you can find at https://github.com/hsrmbeamertheme/hsrmbeamertheme.
%

\ProvidesPackage{beamerthemem}

%{{{ --- Packages ---------------------

\usepackage[no-math]{fontspec}
\usepackage{etoolbox}
\usepackage{tikz}

\usetikzlibrary{backgrounds}

\usecolortheme{metropolis}
\usefonttheme{metropolis}

%}}}
%{{{ --- Options ----------------------

\newif\if@doSectionPage
\@doSectionPagefalse
\DeclareOption{nosectionpages}{\@doSectionPagetrue}
\ProcessOptions

%}}}
%{{{ --- Titlepage --------------------

\def\maketitle{\ifbeamer@inframe\titlepage\else\frame[plain]{\titlepage}\fi}

\def\titlepage{\usebeamertemplate{title page}}
\setbeamertemplate{title page}
{
  \begin{minipage}[b][\paperheight]{\textwidth}
    \vfill
    \ifx\inserttitle\@empty%
    \else%
    {\raggedright\linespread{0.8}\usebeamerfont{title}\usebeamercolor[fg]{title}\scshape\MakeLowercase{\inserttitle}\par}%
    \vspace*{0.5em}
    \fi%
    \ifx\insertsubtitle\@empty%
    \else%
    {\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
    \vspace*{0.5em}
    \fi%
    \begin{tikzpicture}\draw[mLightBrown] (0, 0) -- (\textwidth, 0);\end{tikzpicture}%
    \vspace*{0.5em}
    \ifx\insertauthor\@empty%
    \else%
    {\usebeamerfont{author}\usebeamercolor[fg]{author}\insertauthor\par}%
    \vspace*{0.25em}
    \fi%
    \ifx\insertdate\@empty%
    \else%
    {\usebeamerfont{date}\usebeamercolor[fg]{date}\insertdate\par}%
    \fi%
    \ifx\insertinstitut\@empty%
    \else%
    \vspace*{3mm}
    {\usebeamerfont{institute}\usebeamercolor[fg]{institute}\insertinstitute\par}%
    \fi%
    \vfill
    \vspace*{5mm}
  \end{minipage}
}

%}}}
%{{{ --- Progressbar ------------------

\makeatletter
\def\progressbar@progressbar{}  % the progress bar
\newcount\progressbar@tmpcounta % auxiliary counter
\newcount\progressbar@tmpcountb % auxiliary counter
\newdimen\progressbar@pbht      % progressbar height
\newdimen\progressbar@pbwd      % progressbar width
\newdimen\progressbar@tmpdim    % auxiliary dimension

\progressbar@pbwd=20em
\progressbar@pbht=0.5pt

% the progress bar
\def\progressbar@progressbar{%
  \progressbar@tmpcounta=\insertframenumber
  \progressbar@tmpcountb=\inserttotalframenumber
  \progressbar@tmpdim=\progressbar@pbwd
  \multiply\progressbar@tmpdim by \progressbar@tmpcounta
  \divide\progressbar@tmpdim by \progressbar@tmpcountb

  \makebox[\textwidth][c]{
    \begin{tikzpicture}[tight background]

      \node[anchor=west, white, inner sep=0pt] at (0pt, 0pt) {\insertsectionHEAD};

      \draw[anchor=west, mDarkBrown, fill=mDarkBrown, inner sep=0pt]
      (2pt, -16pt) rectangle ++ (\progressbar@pbwd, \progressbar@pbht);

      \draw[anchor=west, mMediumBrown, fill=mMediumBrown, inner sep=0pt]
      (2pt, -16pt) rectangle ++ (\progressbar@tmpdim, \progressbar@pbht);
    \end{tikzpicture}%
  }
}

\def\progressbar@progressbarfoo{%
  \progressbar@tmpcounta=\insertframenumber
  \progressbar@tmpcountb=\inserttotalframenumber
  \progressbar@tmpdim=\paperwidth
  \multiply\progressbar@tmpdim by \progressbar@tmpcounta
  \divide\progressbar@tmpdim by \progressbar@tmpcountb

  \begin{tikzpicture}[tight background]
    \draw[mDarkBrown, fill=mDarkBrown] (0, 0) rectangle (\paperwidth, 0.2pt);
    \draw[mLightBrown, fill=mLightBrown] (0, 0) rectangle (\progressbar@tmpdim, 0.2pt);
  \end{tikzpicture}
}
%}}}
%{{{ --- Commands ---------------------

\newcommand{\insertsectionHEAD}{%
  \expandafter\insertsectionHEADaux\insertsectionhead}
  \newcommand{\insertsectionHEADaux}[3]{\textsc{\MakeLowercase{#3}}
}

\newcommand{\plain}[2]{%
  \begingroup
  \setbeamercolor{background canvas}{bg=mDarkTeal}
  \begin{frame}{#1}
    \centering
    \vfill\vspace{1em}\usebeamerfont{section title}\textcolor{white}{\scshape #2}\vfill
  \end{frame}
  \endgroup
}

%}}}
%{{{ --- Itemize ----------------------
\newcommand{\itemBullet}{∙}

\setbeamertemplate{itemize item}{\itemBullet}
\setbeamertemplate{itemize subitem}{\itemBullet}
\setbeamertemplate{itemize subsubitem}{\itemBullet}
\setlength{\parskip}{0.5em}

%}}}
%{{{ --- Sections ---------------------

\if@doSectionPage\@empty
\else
% Insert frame with section title at every section start
\AtBeginSection[]
{
  \begingroup
  \setbeamercolor{background canvas}{bg=mDarkTeal}
  \begin{frame}[plain]
    \vspace{2em}\usebeamerfont{section title}
    \progressbar@progressbar%
  \end{frame}
  \endgroup
}
\fi

%}}}
%{{{ --- Captions ---------------------

\setbeamertemplate{caption label separator}{: }

%}}}
%{{{ --- Footline ---------------------

\usenavigationsymbolstemplate{}
\setbeamertemplate{footline}
{%
\begin{beamercolorbox}[wd=\textwidth,ht=3ex,dp=1.5ex,leftskip=0.3cm,rightskip=0.3cm]{structure}%
\hfill\usebeamerfont{page number in head/foot}%
\insertframenumber%
\end{beamercolorbox}%
}

%}}}
%{{{ --- Frametitle -------------------
\setbeamertemplate{frametitle}{%
% \nointerlineskip
\begin{beamercolorbox}[wd=\paperwidth,leftskip=0.3cm,rightskip=0.3cm,ht=2.5ex,dp=1.5ex]{frametitle}
  \usebeamerfont{frametitle}\MakeLowercase{\insertframetitle}%
\end{beamercolorbox}%
\vspace{-.5em}
\begin{beamercolorbox}[wd=\paperwidth,ht=1pt,dp=0pt]{frametitle}
  \progressbar@progressbarfoo
\end{beamercolorbox}
}
%}}}

\mode
<all>

% {{{ misc
\let\otp\titlepage
\renewcommand{\titlepage}{\otp\addtocounter{framenumber}{-1}}

\linespread{1.15}
%}}}