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Vendor the trantor theme for ltx-talk

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trantor is Marco Pompili's Metropolis-like theme for ltx-talk, added
under its MIT license so the deck keeps roughly its present look after
the class change. Two things differ from upstream: font selection moves
out to the document, since this template ships OpenSans and RobotoMono,
and the Euler maths font it loaded by default is dropped because
lum-euler is not packaged in Debian's TeX Live.

Upstream: https://github.com/mrc-pop/trantor

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Benjamin Mako Hill
2026-08-13 19:11:51 -07:00
parent 80f817dfdb
commit 9c473a8419
2 changed files with 268 additions and 0 deletions
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MIT License
Copyright (c) 2026 Marco Pompili
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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% trantor.sty -- a Metropolis-style theme for the ltx-talk class.
% LuaLaTeX only. Fonts: Libertinus Serif/Sans (text) + Euler (maths).
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{trantor}[2026-08-01 v1.0 Metropolis-like theme for ltx-talk]
% LuaTeX only (XeTeX is unsupported and the fonts need a Unicode engine).
\RequirePackage{iftex}
\RequireLuaTeX
\RequirePackage{tikz}
\RequirePackage{pifont}
% -- Fonts. Upstream sets Libertinus here and loads lum-euler for maths.
% Both are left to the document instead: this template ships OpenSans and
% RobotoMono, and lum-euler is not packaged in Debian's TeX Live. The document
% is expected to \setsansfont, \setmonofont and load a Unicode maths font
% before using anything below. \headerfont is what the theme uses for titles
% and other display text; redefine it if you want titles in a second face.
\renewcommand{\familydefault}{\sfdefault}
\linespread{1.18}
\providecommand\headerfont{\sffamily}
\makeatletter
% Tighten the space around display maths -- the default 11pt reads as a big gap
% on a slide, especially inside a list. Re-applied on every \normalsize so the
% size files don't reset it.
\g@addto@macro\normalsize{%
\setlength\abovedisplayskip{5pt plus 2pt minus 1pt}%
\setlength\belowdisplayskip{5pt plus 2pt minus 1pt}%
\setlength\abovedisplayshortskip{5pt plus 2pt minus 1pt}%
\setlength\belowdisplayshortskip{5pt plus 2pt minus 1pt}%
}
% -- Colours. Set your own accent anywhere in the preamble with, e.g.,
% \definecolor{accent}{HTML}{BF1238}
\providecolor{accent}{HTML}{2A7AE2}
\colorlet{TrantorDark}{black}
% Lightest grey that still meets WCAG AA contrast (4.5:1) on white (~4.54:1).
\definecolor{TrantorMuted}{HTML}{767676} % affiliation, footline, arxiv
\AddToHook{begindocument}{\colorlet{TrantorAccent}{accent}}
% itemize/enumerate labels in black rather than the class default
\AddToHook{begindocument}{\colorlet{structure}{black}}
% -- Header bar carrying the frame title (hidden on plain pages).
\AddToHook{begindocument}{%
\EditInstance{header}{std}{
background-color = white,
color = black,
print-frame-title = true,
height = 30pt,
font = \headerfont\bfseries,
left-hspace = \dimexpr\Gm@lmargin - 0.6cm\relax,
}%
\EditInstance{footer}{std}{element-order = {}}%
\EditInstance{frametitle}{header}{after-vspace = 6mm minus 3mm}%
}
% Like \frametitle, but forces a gap below the title on packed slides where the
% header's own spacing collapses. The \par gets us into vertical mode first.
\NewDocumentCommand\stitle{m}{\frametitle{#1}\par\addvspace{4mm}}
% \standoutline{...}: a centred line of text in the title's sans/size/colour,
% for emphasis within a normal (light) frame, e.g. closing a slide.
\NewDocumentCommand\standoutline{m}{%
\par
\begingroup
\centering\headerfont\Large\bfseries\color{TrantorDark}#1\par
\endgroup
}
% Tick and cross, for marking things right or wrong.
\NewDocumentCommand\yes{}{\ding{51}}
\NewDocumentCommand\no{}{\ding{55}}
% \footline{...}: a small reference or citation pinned to the bottom-left of
% the slide. Overlaid, so it can go anywhere inside the frame.
\NewDocumentCommand\footline{m}{%
\begin{tikzpicture}[remember picture, overlay]
\node[anchor=south west, xshift=1ex, yshift=0.7ex, font=\scriptsize, text=TrantorMuted]
at (current page.south west) {#1};
\end{tikzpicture}%
}
% \arxiv{1306.5001}: a small, grey "arXiv:<id>" tag linked to the abstract.
% Meant to sit inline next to a statement, e.g. a theorem.
\NewDocumentCommand\arxiv{m}{%
\href{https://arxiv.org/abs/#1}{{\headerfont\scriptsize\color{TrantorMuted}arXiv:#1}}%
}
% -- Bottom progress bar + frame counter (hidden on plain pages).
\newif\iftrantorPlainPage
\trantorPlainPagefalse
\AddToHook{shipout/foreground}{%
\iftrantorPlainPage\else
\trantorArtifactBegin
\begin{tikzpicture}[remember picture, overlay]
\pgfmathsetmacro{\trantorratio}{(\@totalframes > 0) ? (\theframe / \@totalframes) : 0}%
\fill[TrantorAccent]
(current page.south west)
rectangle
([xshift=\trantorratio\paperwidth, yshift=1pt] current page.south west);
\node[anchor=south east, inner sep=5pt, font=\tiny, text=TrantorDark]
at (current page.south east) {\theframe\,/\,\@totalframes};
\end{tikzpicture}%
\trantorArtifactEnd
\fi
\global\trantorPlainPagefalse
}
% -- Remember the current section title, and dim the others in the mini-TOC.
\ExplSyntaxOn
\tl_new:N \g__trantor_section_tl
\AddToHook{section/begin}{
\cs_if_exist:NT \l__talk_section_tl {
\tl_gset:NV \g__trantor_section_tl \l__talk_section_tl
}
}
\cs_new_protected:Npn \__trantor_print_section: { \tl_use:N \g__trantor_section_tl }
\cs_set_eq:NN \trantorSectionTitle \__trantor_print_section:
% Suspend tagging around the theme's decorative / pagination graphics when
% tagging is on (a no-op otherwise), so the progress bar and frame counter stay
% out of the structure tree instead of being flagged as loose content.
\cs_new_protected:Npn \trantorArtifactBegin
{ \cs_if_exist:NT \tag_suspend:n { \tag_suspend:n { trantor } } }
\cs_new_protected:Npn \trantorArtifactEnd
{ \cs_if_exist:NT \tag_resume:n { \tag_resume:n { trantor } } }
% Soften the dimming of inactive TOC entries on the section page (0.2 -> 0.7).
% ltx-talk exposes no key for this yet, so we override the class-private
% \__talk_toc_dest:w. Revisit if a supported interface appears or the internal
% changes.
\cs_set_protected:Npn \__talk_toc_dest:w #1 . #2 . #3 . #4 . #5 \q_stop #6
{
\bool_lazy_or:nnTF
{
\bool_lazy_and_p:nn
{ \int_compare_p:nNn { \value { section } } = {#2} }
{ \int_compare_p:nNn { \value { subsection } } = 0 }
}
{
\bool_lazy_and_p:nn
{ \int_compare_p:nNn { \value { section } } = {#2} }
{ \int_compare_p:nNn { \value { subsection } } = {#3} }
}
{#6}
{ \opacity_begin:n { 0.7 } #6 \opacity_end: }
}
\ExplSyntaxOff
% -- Title page. Drop a logo.png next to your slides, or redefine \titlelogo.
\newcommand{\titlelogo}{%
\IfFileExists{logo.png}
{\includegraphics[height=1.4cm, alt={Organisation logo}]{logo.png}}{}%
}
\renewcommand{\maketitle}{%
\global\trantorPlainPagetrue
\begin{frame}{}%
\thispagestyle{plain}%
\vfill
\hspace*{0.04\paperwidth}%
\begin{minipage}{0.82\paperwidth}
\raggedright
{\color{TrantorDark}\headerfont\Large\bfseries \@title\par}%
\vspace{0.5em}%
{\color{TrantorAccent}\rule{\linewidth}{0.8pt}\par}%
\vspace{1.3em}%
% Metadata on the left, logo on the right; bottom-aligned so the logo sits
% level with the date and grows upward rather than below it.
\begin{minipage}[b]{0.66\linewidth}
\raggedright
{\normalsize \@author\par}%
\ifx\@institute\empty\else
\vspace{0.2em}%
{\small\color{TrantorMuted} \@institute\par}%
\fi
\vspace{0.2em}%
{\small \@date\par}%
\end{minipage}%
\hfill
\begin{minipage}[b]{0.30\linewidth}
\raggedleft
\titlelogo
\end{minipage}%
\end{minipage}%
\hspace*{0.04\paperwidth}%
\vspace{0.12\paperheight}%
\end{frame}%
}
% -- Section divider page (dark full-bleed panel with the mini-TOC).
\NewDocumentCommand \sectionpage { } {%
\global\trantorPlainPagetrue
\begin{frame}{}%
\thispagestyle{plain}%
\noindent
\begin{tikzpicture}
\useasboundingbox (0,0) rectangle (\linewidth,-\textheight);
\fill[TrantorDark]
(-\Gm@lmargin, \paperheight)
rectangle
(\dimexpr\paperwidth-\Gm@lmargin\relax, -\paperheight);
\node[text=white, anchor=center, inner sep=0pt]
at (0.5\linewidth, -0.5\textheight) {%
\begin{minipage}{\linewidth}
\centering
\setcounter{tocdepth}{1}%
\colorlet{structure}{white}%
\setlength{\parskip}{1.2em}% spacing between TOC entries
\headerfont\Large
\tableofcontents
\end{minipage}%
};
\end{tikzpicture}%
\end{frame}%
}
% \standout{...}: a full frame with the same dark panel as \sectionpage,
% and the given text centred on it.
\NewDocumentCommand \standout { +m } {%
\global\trantorPlainPagetrue
\begin{frame}{}%
\thispagestyle{plain}%
\noindent
\begin{tikzpicture}
\useasboundingbox (0,0) rectangle (\linewidth,-\textheight);
\fill[TrantorDark]
(-\Gm@lmargin, \paperheight)
rectangle
(\dimexpr\paperwidth-\Gm@lmargin\relax, -\paperheight);
\node[text=white, anchor=center, inner sep=0pt]
at (0.5\linewidth, -0.5\textheight) {%
\begin{minipage}{0.8\linewidth}
\centering
\headerfont\LARGE\bfseries
#1
\end{minipage}%
};
\end{tikzpicture}%
\end{frame}%
}
\makeatother