configure a Python env for the slides

slides/demo.md

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+---
+title: A introduction to Nix(OS)
+author: Birk
+theme: 
+  name: tokyonight-storm
+options:
+    auto_render_languages:
+        - mermaid
+---
+
+Customizability
+---
+
+_presenterm_ allows configuring almost anything about your presentation:
+
+* The colors used.
+* Layouts.
+* Footers, including images in the footer.
+
+```mermaid
+sequenceDiagram
+    Mark --> Bob: Hello!
+    Bob --> Mark: Oh, hi mark!
+```
+
+<!-- pause -->
+
+This is an example on how to configure a footer:
+
+```yaml
+footer:
+  style: template
+  left:
+    image: doge.png
+  center: '<span class="noice">Colored</span> _footer_'
+  right: "{current_slide} / {total_slides}"
+  height: 5
+
+palette:
+  classes:
+    noice:
+      foreground: red
+```
+
+<!-- end_slide -->
+
+Headers
+---
+
+Markdown headers can be used to set slide titles like:
+
+```markdown
+Headers
+-------
+```
+
+# Headers
+
+Each header type can be styled differently.
+
+## Subheaders
+
+### And more
+
+<!-- end_slide -->
+
+Code highlighting
+---
+
+Highlight code in 50+ programming languages:
+
+```rust
+// Rust
+fn greet() -> &'static str {
+    "hi mom"
+}
+```
+
+```python
+# Python
+def greet() -> str:
+    return "hi mom"
+```
+
+<!-- pause -->
+
+-------
+
+Code snippets can have different styles including no background:
+
+```cpp +no_background +line_numbers
+// C++
+string greet() {
+    return "hi mom";
+}
+```
+
+<!-- end_slide -->
+
+Dynamic code highlighting
+---
+
+Dynamically highlight different subsets of lines:
+
+```rust {1-4|6-10|all} +line_numbers
+#[derive(Clone, Debug)]
+struct Person {
+    name: String,
+}
+
+impl Person {
+    fn say_hello(&self) {
+        println!("hello, I'm {}", self.name)
+    }
+}
+```
+
+<!-- end_slide -->
+
+Snippet execution
+---
+
+Code snippets can be executed on demand:
+
+* For 20+ languages, including compiled ones.
+* Display their output in real time.
+* Comment out unimportant lines to hide them.
+
+```rust +exec
+# use std::thread::sleep;
+# use std::time::Duration;
+fn main() {
+    let names = ["Alice", "Bob", "Eve", "Mallory", "Trent"];
+    for name in names {
+        println!("Hi {name}!");
+        sleep(Duration::from_millis(500));
+    }
+}
+```
+
+<!-- end_slide -->
+
+Images
+---
+
+Images and animated gifs are supported in terminals such as:
+
+* kitty
+* iterm2
+* wezterm
+* ghostty
+* Any sixel enabled terminal
+
+<!-- column_layout: [1, 3, 1] -->
+
+<!-- column: 1 -->
+
+
+_Picture by Alexis Bailey / CC BY-NC 4.0_
+
+<!-- end_slide -->
+
+Column layouts
+---
+
+<!-- column_layout: [7, 3] -->
+
+<!-- column: 0 -->
+
+Use column layouts to structure your presentation:
+
+* Define the number of columns.
+* Adjust column widths as needed.
+* Write content into every column.
+
+```rust
+fn potato() -> u32 {
+    42
+}
+```
+
+<!-- column: 1 -->
+
+<!-- reset_layout -->
+
+---
+
+Layouts can be reset at any time.
+
+```python
+print("Hello world!")
+```
+
+<!-- end_slide -->
+
+Text formatting
+---
+
+Text formatting works including:
+
+* **Bold text**.
+* _Italics_.
+* **_Bold and italic_**.
+* ~Strikethrough~.
+* `Inline code`.
+* Links [](https://example.com/)
+* <span style="color: red">Colored</span> text.
+* <span style="color: blue; background-color: black">Background color</span> can be changed too.
+
+<!-- end_slide -->
+
+More markdown
+---
+
+Other markdown elements supported are:
+
+# Block quotes
+
+> Lorem ipsum dolor sit amet. Eos laudantium animi ut ipsam beataeet
+> et exercitationem deleniti et quia maiores a cumque enim et
+> aspernatur nesciunt sed adipisci quis.
+
+# Alerts
+
+> [!caution]
+> Github style alerts
+
+# Tables
+
+| Name   | Taste  |
+| ------ | ------ |
+| Potato | Great  |
+| Carrot | Yuck   |
+
+<!-- end_slide -->
+
+<!-- jump_to_middle -->
+
+The end
+---

slides/flake.nix

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+# { ... }:
+
+# let
+#   pkgs =
+#     import
+#       (fetchTarball "https://github.com/NixOS/nixpkgs/archive/10e687235226880ed5e9f33f1ffa71fe60f2638a.tar.gz")
+#       { };
+# in
+# pkgs.mkShell {
+#   packages = [
+#     (with pkgs; [
+#       locale
+#     ])
+#     (pkgs.python312Full.withPackages (
+#       python-pkgs: with python-pkgs; [
+#         pip
+#       ]
+#     ))
+#   ];
+# }
+
+{
+  description = "Python environment";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        formatter = pkgs.nixfmt-tree;
+        devShells.default = pkgs.mkShell {
+          packages = [
+            (with pkgs; [
+              locale
+            ])
+            (pkgs.python312Full.withPackages (
+              python-pkgs: with python-pkgs; [
+                pip
+              ]
+            ))
+          ];
+        };
+      }
+    );
+}