feat(tazjin/tvix-eval-2023): add link collection blog post & QR code r/6544

Makes it possible for people in the audience to get to the link
collection reasonably quickly.

Later on that post can also have the talk itself added. For now it is
unlisted.

Change-Id: If9ae1d88d3c6f22bbd70b2b3cbea0b0d42895a93
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9208
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: Mark Shevchenko <markshevchenko@gmail.com>
Tested-by: BuildkiteCI

4 files changed, 34 insertions, 11 deletions

diff --git a/users/tazjin/blog/posts.nix b/users/tazjin/blog/posts.nix
index 60ce82f620..9f5ea67a43 100644
--- a/users/tazjin/blog/posts.nix
+++ b/users/tazjin/blog/posts.nix
@@ -1,6 +1,13 @@
 # This file defines all the blog posts.
 [
   {
+    key = "tvix-eval-talk-2023";
+    title = "[доклад] tvix-eval, имплементация языка Nix на Rust";
+    date = 1694102400;
+    content = ./posts/tvix-eval-talk-2023.md;
+    listed = false; # publish after the talk recording is available
+  }
+  {
     key = "emacs-is-underrated";
     title = "Emacs is the most underrated tool";
     date = 1581286656;
diff --git a/users/tazjin/blog/posts/tvix-eval-talk-2023.md b/users/tazjin/blog/posts/tvix-eval-talk-2023.md
new file mode 100644
index 0000000000..ca09a8f7a8
--- /dev/null
+++ b/users/tazjin/blog/posts/tvix-eval-talk-2023.md
@@ -0,0 +1,13 @@
+7 сентября я выступил с докладом про реализацию языка Nix на Rust, на
+[Московском Rust-митапе][rustmsk] / [Московском клубе
+программистов][progmsk].
+
+Вот все связанные с ним ссылки, которые могут быть интересны:
+
+* [Tvix](https://tvix.dev), главный сайт проекта
+* [TVL](https://tvl.fyi), наше онлайн-сообщество
+* [Tvixbolt](https://tvixbolt.tvl.su/), наш "godbolt" для tvix
+* [MMTk](https://www.mmtk.io/), Rust-библиотека с компонентами для garbage-collection
+
+[rustmsk]: https://t.me/ruRust_msk
+[progmsk]: https://prog.msk.ru/
diff --git a/users/tazjin/presentations/tvix-eval-2023/default.nix b/users/tazjin/presentations/tvix-eval-2023/default.nix
index 6b30768950..ce831556de 100644
--- a/users/tazjin/presentations/tvix-eval-2023/default.nix
+++ b/users/tazjin/presentations/tvix-eval-2023/default.nix
@@ -1,7 +1,7 @@
 { depot, pkgs, ... }:
 
 let
-  inherit (pkgs) fontconfig texlive stdenv imagemagick;
+  inherit (pkgs) fontconfig texlive stdenv imagemagick runCommand qrencode;
 
   tex = texlive.combine {
     inherit (texlive)
@@ -22,6 +22,15 @@ let
       translator;
   };
 
+  linksQrCode = runCommand "qrcode.png" { } ''
+    ${qrencode}/bin/qrencode -o code.png -s 8 \
+      --background=fafafa \
+      --foreground=000000 \
+      'https://tazj.in/blog/tvix-eval-talk-2023'
+
+    # latex has trouble with the PDF produced by qrencode
+    ${imagemagick}/bin/convert code.png $out
+  '';
 in
 stdenv.mkDerivation {
   name = "progmsk-tvix-eval";
@@ -40,6 +49,7 @@ stdenv.mkDerivation {
 
     # webp images can't be included directly, need to convert to PNG
     convert ${depot.tvix.website}/tvix-logo.webp tvix-logo.png
+    cp ${linksQrCode} qrcode.png
 
     # As usual, TeX needs to be run twice ...
     ${tex}/bin/xelatex presentation.tex
diff --git a/users/tazjin/presentations/tvix-eval-2023/presentation.tex b/users/tazjin/presentations/tvix-eval-2023/presentation.tex
index 3eb1658036..5cb8cd5065 100644
--- a/users/tazjin/presentations/tvix-eval-2023/presentation.tex
+++ b/users/tazjin/presentations/tvix-eval-2023/presentation.tex
@@ -138,17 +138,10 @@
   \end{frame}
 
   \begin{frame}{Спасибо!}
-    Ссылки:
-    \begin{itemize}
-    \item tvix.dev
-    \item tvl.fyi
-    \item tvixbolt.tvl.su
-    \end{itemize}
-
-    % TODO: QR code or something for these links
-
-    \vspace{3cm}
     \begin{center}
+      \includegraphics[width=6cm,keepaspectratio=true]{qrcode.png}
+
+      https://tazj.in/blog/tvix-eval-talk-2023 \\
       t.me/tazjin | tazjin@tvl.su
     \end{center}
   \end{frame}