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

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{sel4}[2020/09/24 v1.0 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
%   makeTitle:	generate the title header even if there is no \maketitle command
%   copyright:	generate the copyright footer with the present year
%
%
%   COMMANDS:
%     - INPUTS:
%        \title			Document title in header, default: none
%        \subtitle		Document subtitle title in header, ignored if title is empty
%        \author			Document author, ignored if title is empty
%        \authortitle           Title of author, ignored if author is empty
%        \email                   Contact email, ignored if author is empty
%        \docversion          Document version
%        \date			Date of document, default \today, ignored if title is empty
%        \header			Organisation/originator to go in TRHS of header, multiple lines
%					default: "The seL4 Foundation"
%        \theurl			Org URL, default: seL4 Foundation URL
%        \copyYear		Year of copyright (default: this year)
%     - OUTPUTS:
%        \doCopyright	Produces the copyright notice, must be placed
%                                      right after \maketitle
%					The `copyright' option is equivalent to \doCopyright immediately after \maketitle
%        \thedocversion      Document version string
%        \thedate                Date string
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newif\ifb@nner\b@nnertrue
\newif\ifm@aketitle\m@aketitlefalse
\newif\ifc@pyright\c@pyrightfalse

%% options section
\DeclareOption{noBanner}{\b@nnerfalse}
\DeclareOption{makeTitle}{\m@aketitletrue}
\DeclareOption{copyright}{\c@pyrighttrue}

\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[iso]{isodate}
\RequirePackage{hyperref}
% Coloured quoted text:
% \RequirePackage[breakable]{tcolorbox}
\usepackage[breakable]{tcolorbox}

\if@titlepage
\typeout{sel4 style with titlepage}
\else
\typeout{sel4 style without 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}

% hyperref
\hypersetup{colorlinks, allcolors=neutral, anchorcolor=black,
            citecolor=greenDark, linkcolor=greenDark}
% tcolorbox
\newtcolorbox{cquote}{colback=neutralLighter,boxrule=0pt,boxsep=0pt,breakable}
\renewenvironment{quote}
{\list{}{\rightmargin=2ex \leftmargin=4ex}%
 \item\relax\cquote}
{\endcquote\endlist}

%% definitions
\renewcommand{\familydefault}{\sfdefault}
\def\h@eader{The seL4\textsuperscript\textregistered\ 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\theurl#1{\def\u@rl{#1}}
\def\title#1{\def\@title{#1}}
\def\subtitle#1{\def\@subtitle{#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{\Logo@FileName}{logos/seL4-Foundation-logo.pdf}
\newcommand{\Triang@FileName}{logos/blacktriangle.pdf}
\newcommand{\L@ogo}{\includegraphics[keepaspectratio=true,height=23mm]{\Logo@FileName}}

%%% Produces copyright notice as a pseudo footnote without a footnote mark
% Use it right at the top, or just after \maketitle. The optional argument is the year of the
% copyright, it defaults to the current year.
\newif\ifc@pyrightdone\c@pyrightdonefalse
\newcommand{\doCopyright}[1][\the\year]{%
  \ifc@pyrightdone\else%
  \let\s@makefnmark=\@makefnmark%
  \let\@makefnmark\relax%
  \footnote{%
    \hspace*{-1.8em}%    Magic number from article.cls/report.cls
    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.
  }
  \let\@makefnmark=\s@makefnmark%
  \c@pyrightdonetrue%
}


%% the part of the headers that's common with or without titlepage
\def\m@akeheader{%
  \begin{minipage}[b]{\paperwidth}%
    \hspace*{16mm}%
    \raisebox{2.5mm}[38mm][0mm]{\L@ogo}%
    \hfill
    \raisebox{4mm}{%
      \footnotesize%
      \textcolor{greenLogo}{
        \begin{tabular}[b]{r}\bf
          \raisebox{0pt}[0pt][10mm]{\rule{0pt}{8mm}}%
          \begin{tabular}[t]{r@{}}
            \h@eader
          \end{tabular}\\
          % force URL colour to be green or black, irrespective of hyperref setup
          \bf\href{\u@rl}{\textcolor{greenLogo}\u@rl}
        \end{tabular}
      }%
    }\hspace*{5mm}
  \end{minipage}%
}%

%% the main thing: \maketitle produces the letterhead
\if@titlepage
\renewcommand\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}%
    \newlength{\img@shift}%
    % the black triangle
    \setlength{\img@raise}{-\paperheight}%
    \addtolength{\img@raise}{\Gm@tmargin}%
    \addtolength{\img@raise}{4.2mm}% don't ask me why!
    \setlength{\img@shift}{-\Gm@lmargin}%
    % make black triangle extend 0.1mm beyond margins to prevent a white line
    \newlength{\img@width}\setlength{\img@width}{1.001\paperwidth}%
    \newlength{\img@height}\setlength{\img@height}{1.001\paperheight}%
    \addtolength{\img@shift}{-0.0005\paperwidth}\addtolength{\img@raise}{-0.0005\paperheight}%
%    \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*{\img@shift}%
      \makebox[0pt][l]{%
        \includegraphics[keepaspectratio=false,width=\img@width,height=\img@height]{\Triang@FileName}%
      }%
    }
    % header
    \raisebox{4mm}[0pt][0pt]{\hspace*{-\Gm@tmargin}%
      \m@akeheader
    }%
    %
    \null%\vfil
    \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}
  \m@aketitlefalse
}
\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
    \m@akeheader
  }%
  % reset overfull rule
  \setlength{\overfullrule}{\saveOverfullRule}%
  \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
          \ifx\@authortitle\empty\else{\large\\\@authortitle}\fi
          \ifx\@email\empty\else{\normalsize\\\@email}\fi
          \\[1ex]}%
      \fi%
      \ifx\@docversion\empty\else\@docversion\\\fi
      \ifx\@date\empty \else\@date \\\fi%
      \vspace{5ex}%
    \end{center}%
  \fi%
  \m@aketitlefalse
}%\maketitle
\fi% no titlepage

\AtBeginDocument{%
  \ifm@aketitle%
     \maketitle%
     \let\maketitle\relax%
     \m@aketitlefalse%
   \fi%
   \ifc@pyright%
     \doCopyright%
   \fi%
}