% Copyright seL4 Project a Series of LF Projects, LLC
% SPDX-License-Identifier: CC-BY-SA-4.0

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{sel4}[2020/04/01 v0.5 seL4 Foundation letterhead and title page]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Letterhead and title page for the seL4 Foundation
%
% Written 2020-03-23 by Gernot Heiser <gernot@sel4.systems>
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% OPTIONS:
%   noBanner:	no black banner underneath the logo
%
%
%   COMMANDS:
%     - INPUTS:
%        \title			Document title in header, default: none
%        \author			Document author, ignored if title is empty
%        \date			Date of document, default \today, ignored if title is empty
%        \header			Organisation/originator to go in TRHS of header, multiple lines
%					default: seL4 Foundation
%        \url			Org URL, default: seL4 Foundation URL
%        \copyYear		Year of copyright (default: this year)
%     - OUTPUTS:
%        \doCopyright	Produces the copyright notice
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%   To Do:
%   - test \header, \url
%   - proper stacking of header

\newif\ifb@nner\b@nnertrue

%% options section
\DeclareOption{noBanner}{\b@nnerfalse}

\ProcessOptions\relax

%% package section
\RequirePackage[margin=25mm]{geometry}
\RequirePackage{fancyhdr}
\RequirePackage{enumitem}
\RequirePackage{parskip}
\RequirePackage{sfmath}
\RequirePackage{graphicx}
\usepackage[T1]{fontenc}
\usepackage[sfdefault]{roboto}
\RequirePackage{xcolor}
% \RequirePackage[datesep=-,style=iso]{datetime2}
\RequirePackage[iso]{isodate}

\if@titlepage
\typeout{have titlepage}
\else
\typeout{no titlepage}
\fi

%% Foundation colour scheme:
\definecolor{greenLight}{HTML}{C0DF9A}
\definecolor{greenLogo}{HTML}{96CA50}
\definecolor{greenDark}{HTML}{668B37}
\definecolor{accentLight}{HTML}{D5AEAA}
\definecolor{accent}{HTML}{AC5D55}
\definecolor{accentDark}{HTML}{820C00}
\definecolor{emphasisLight}{HTML}{FFE0A2}
\definecolor{emphasis}{HTML}{FFCA5F}
\definecolor{emphasisDark}{HTML}{B78B41}
% white (already defined)
\definecolor{neutralLighter}{HTML}{D6DBE4}
\definecolor{neutralLight}{HTML}{8897AE}
\definecolor{neutral}{HTML}{385378}
\definecolor{neutralDark}{HTML}{263852}
% black (already defined)

\colorlet{logoGreen}{greenLogo}
\colorlet{seL4Green}{greenLogo}


%% definitions
\renewcommand{\familydefault}{\sfdefault}
\def\h@eader{The seL4 Foundation\\\\}
\def\u@rl{https://sel4.systems/Foundation}
\def\@title{}
\def\@subtitle{}
\def\@author{}
\def\@authortitle{}
\def\@email{}
\def\@docversion{}
\def\@date{\today}
\def\header#1{\def\h@eader{#1}}
\def\title#1{\def\@title{#1}}
\def\author#1{\def\@author{#1}}
\def\authortitle#1{\def\@authortitle{#1}}
\def\email#1{\def\@email{#1}}
\def\docversion#1{\def\@docversion{#1}}
\def\thedocversion{\@docversion}
\def\date#1{\def\@date{#1}}
\def\thedate{\value\@date}
\def\thanks{\undefined}
\newcommand{\subtitle}[1]{\def\@subtitle{#1}}
\newcommand{\Logo@FileName}{imgs/logos/seL4-Foundation-logo.pdf}
\newcommand{\Triang@FileName}{imgs/blacktriangle.pdf}
\newcommand{\Key@FileName}{imgs/seL4-key.pdf}
\newcommand{\L@ogo}{\includegraphics[keepaspectratio=true,height=23mm]{\Logo@FileName}}
\newcommand{\K@ey}{\includegraphics[keepaspectratio=true,width=1.04\paperwidth]{\Key@FileName}}

\newcommand{\doCopyright}[1][\the\year]{
  Copyright \copyright~#1 seL4 Project a Series of LF Projects, LLC.\\
  Distributed under the
  \href{https://creativecommons.org/licenses/by-sa/4.0/legalcode}{Creative
    Commons Attribution-ShareAlike 4.0 International (CC~BY-SA~4.0) License.}\\
  seL4 is a trademark of LF Projects, LLC.
}


%% the main thing: \maketitle produces the letterhead

\if@titlepage
\renewcommand\maketitle{%
  \typeout{Starting \protect\maketitle}
  \noindent%
  \begin{titlepage}%
    \urlstyle{sf}
    % to suppress Overfull \hbox warnings
    \newlength{\saveHfuzz}
    \setlength{\saveHfuzz}{\hfuzz}
    \setlength{\hfuzz}{\paperwidth}
    %
    \let\footnotesize\small
    \let\footnoterule\relax
    \let \footnote \thanks
    % laying out the background
    \newlength{\img@raise}
    % the black triangle
    \setlength{\img@raise}{-\paperheight}%
    \addtolength{\img@raise}{\Gm@tmargin}%
    \addtolength{\img@raise}{4mm}% don't ask me why!
%    \typeout{paperheight=\the\paperheight,
%      paperwidth=\the\paperwidth,
%      Gm@lmargin=\Gm@lmargin,
%      Gm@tmargin=\Gm@tmargin,
%      img@raise=\the\img@raise,
%      hfuzz=\the\hfuzz}
    \raisebox{\img@raise}[0pt][0pt]{\hspace*{-\Gm@lmargin}%
      \makebox[0pt][l]{%
        \includegraphics[keepaspectratio=false,width=\paperwidth,height=\paperheight]{\Triang@FileName}%
      }%
    }
    % header
    \raisebox{4mm}[0pt][0pt]{\hspace*{-\Gm@tmargin}%
      \begin{minipage}[b]{\paperwidth}%
        \hspace*{22mm}%
        \raisebox{2.5mm}[38mm][0mm]{\L@ogo}%
        \hfill
        \raisebox{4mm}{%
          \footnotesize%
          \textcolor{greenLogo}{
            \begin{tabular}[b]{r}\bf
              \h@eader\\
              % force URL colour to be green or black, irrespective of hyperref setup
              \bf\href{\u@rl}{\textcolor{\ifb@nner greenLogo\else black\fi}\u@rl}
            \end{tabular}
          }
        }\hspace*{5mm}
        % key
        \setlength{\img@raise}{-\paperheight}%
        \addtolength{\img@raise}{\Gm@tmargin}%
        \addtolength{\img@raise}{-4mm}% don't ask me why!
        \raisebox{\img@raise}[0pt][0pt]{%
          \makebox[0pt][r]{%
            \K@ey%
          }%
        }%
      \end{minipage}%
    }%
    %
    \null%\vfil
    % \vskip 60\p@
    \raggedright% to prevent stuff shifting
    \vskip 50mm%
    ~\hfill%
    \makebox[0pt][r]{
      \raisebox{0pt}[0pt][0pt]{
        \begin{minipage}{150mm}
          \raggedleft
          \fontsize{36}{42}\selectfont \textcolor{greenLogo}{\@title}\\%
          \if\@subtitle\empty
          ~
          \else
          \fontsize{36}{42}\selectfont \textcolor{emphasis}{\@subtitle}
          \fi%
        \end{minipage}
        \hspace*{-10mm}
      }
    }
    \vskip 70mm
    \makebox[0pt][l]{
      \hspace*{-13mm}
      \raisebox{0pt}[0pt][0pt]{
        \begin{minipage}{70mm}%
          \raggedright%
          \color{neutral}
          \fontsize{20}{26}\selectfont%
          \@author\par
          \fontsize{14}{22}\selectfont%
          \ifx\@authortitle\empty\else\@authortitle\par\fi
          \ifx\@email\empty\else\@email\par\fi
          \ifx\@docversion\empty\else\@docversion\par\fi
          \ifx\@date\empty\else\@date\par\fi
        \end{minipage}
      }
    }
  \setcounter{page}{0}
  \end{titlepage}%
  \thispagestyle{fancyplain}
  \setlength{\hfuzz}{\saveHfuzz}%
  \setcounter{footnote}{0}%
  \global\let\thanks\relax
  \global\let\maketitle\relax
  \global\let\@thanks\@empty
  \global\let\@author\@empty
  \global\let\@date\@empty
  \global\let\@title\@empty
  \global\let\title\relax
  \global\let\author\relax
  \global\let\date\relax
  \global\let\and\relax
  \setcounter{page}{0}
  \typeout{Finish \protect\maketitle}
}
\else% no titlepage
\def\maketitle{\urlstyle{sf}
  % to suppress overfull bars in ``draft'' mode:
  \newlength{\saveOverfullRule}
  \setlength{\saveOverfullRule}{\overfullrule}
  \setlength\overfullrule{0pt}
  %
  \noindent%
  \raisebox{0mm}[0pt][0pt]{\hspace*{-25mm}%
    \ifb@nner\makebox[0pt][l]{\rule{\paperwidth}{40mm}}\fi% black banner
    \begin{minipage}[b]{\paperwidth}%
      \hspace*{16mm}%
      \raisebox{2.5mm}[38mm][0mm]{\L@ogo}%
      \hfill
      \raisebox{4mm}{%
        \footnotesize%
        \textcolor{\ifb@nner greenLogo\else black\fi}{
          \begin{tabular}[b]{r}\bf
            \h@eader\\
            % force URL colour to be green or black, irrespective of hyperref setup
            \bf\href{\u@rl}{\textcolor{\ifb@nner greenLogo\else black\fi}\u@rl}
          \end{tabular}
        }
      }\hspace*{5mm}
    \end{minipage}%
  }%
  % reset overfull rule
  \setlength{\overfullrule}{\saveOverfullRule}%
%  \@maketitle
  \vspace*{12mm}%
  \ifx\@title\empty \else%
    \begin{center}
      {\LARGE\bf\@title\\[1ex]}
      \ifx\@subtitle\empty \else{\Large\@subtitle} \\[1ex]\fi%
      \ifx\@author\empty \else{\Large\@author\\[2ex]} \fi%
      \ifx\@date\empty \else\@date \\\fi%
      \vspace{5ex}%
    \end{center}%
  \fi%
}%\maketitle
\fi% no titlepage