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‎.github/workflows/ci.yml‎

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name: CI
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on:
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push:
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branches: [master, main]
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pull_request:
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jobs:
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check:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
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- uses: DeterminateSystems/determinate-nix-action@b3e3f405539b332fcb96794525f35fb10c230baa # v3.13.2
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- run: nix flake check --all-systems

‎.github/workflows/pages.yml‎

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name: Deploy to GitHub Pages
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on:
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push:
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branches: [master, main]
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workflow_dispatch:
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permissions:
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contents: read
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pages: write
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id-token: write
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concurrency:
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group: pages
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cancel-in-progress: false
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
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- uses: DeterminateSystems/determinate-nix-action@b3e3f405539b332fcb96794525f35fb10c230baa # v3.13.2
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- name: Build website
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run: nix build .#website
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- name: Upload artifact
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uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
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with:
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path: result
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deploy:
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environment:
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name: github-pages
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url: ${{ steps.deployment.outputs.page_url }}
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runs-on: ubuntu-latest
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needs: build
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steps:
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- name: Deploy to GitHub Pages
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id: deployment
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uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5

‎.gitignore‎

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# Nix build outputs
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**/result
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**/result-*
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# Direnv
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/.direnv
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.envrc
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# Editor swap/backup
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*~
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.*.swp
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‎Justfile‎

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default: build
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lock:
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nix flake lock
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build:
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nix build .#default
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build-website:
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nix build .#website
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test:
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nix flake check --all-systems
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all-examples:
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just example blog
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just example quine
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just example art
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example name:
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cd examples/{{name}} && nix build

‎LICENSE‎

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Copyright 2025 - @embedding-shapes
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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:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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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.

‎README.md‎

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# niccup
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Hiccup-style HTML generation for Nix. Describe HTML as Nix lists/attrsets, render to strings. Heavily inspired by [hiccup](https://github.com/weavejester/hiccup) (Fast library for rendering HTML in Clojure) by [@weavejester](https://github.com/weavejester)
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[View on GitHub](https://github.com/embedding-shapes/niccup)
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## Installation
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Flakes:
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```nix
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inputs.niccup.url = "github:embedding-shapes/niccup";
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# use inputs.niccup.lib
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```
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Non-flakes:
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```nix
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let
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niccup = builtins.fetchTarball "https://github.com/embedding-shapes/niccup/archive/master.tar.gz";
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h = import (niccup + "/src/lib.nix") { };
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in h.render [ "p" "Hello" ]
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```
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## Security Note
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This library assumes trusted inputs. Like server-side templates, the expressions should be developer-authored code, not user-generated content. Do not pass untrusted input directly to `raw` or `comment`, or do so at your own risk. Don't say you weren't warned tho.
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## Examples
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```nix
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let h = inputs.niccup.lib; in
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h.render [
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"div#main.container"
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{ lang = "en"; class = [ "app" "dark" ]; }
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[ "h1" "Hello from Nix" ]
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[ "p" "Hiccup-style HTML in Nix." ]
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(h.comment "List example")
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[ "ul" (map (x: [ "li.item" x ]) [ "one" "two" "three" ]) ]
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]
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```
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Write to file (use nixpkgs `writeText`):
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```nix
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{ pkgs, inputs, ... }:
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pkgs.writeText "index.html" (inputs.niccup.lib.render [ "p" "Hello" ])
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```
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## Data Model
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**Element**: `[ tag-spec attrs? children... ]`
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**Tag spec**: string with optional CSS shorthand: `"div#id.class1.class2"`. ID must precede classes.
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**Attributes** (optional attrset, second position):
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- Merged with shorthand; classes combine (shorthand first), ID from map overwrites shorthand.
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- `class`: string or list of strings.
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- Boolean `true` renders as `attr="attr"`; `false`/`null` omits the attribute.
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**Children**:
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- Strings/numbers: escaped, numbers via `toString`.
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- Elements: nested `[ tag ... ]` lists.
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- Lists: flattened one level (enables `map` patterns).
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- `raw` nodes: unescaped HTML.
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- `comment` nodes: `<!-- ... -->`.
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**Void tags** (`img`, `br`, `hr`, `input`, `meta`, `link`, `area`, `base`, `col`, `embed`, `source`, `track`, `wbr`): no closing tag.
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## API
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- `render : expr -> string` — Render to minified HTML string.
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- `renderPretty : expr -> string` — Render to indented, human-readable HTML.
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- `raw : string -> node` — Mark content as unescaped HTML.
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- `comment : string -> node` — Emit HTML comment.
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Exported as `lib` from the flake.
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## Development
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```
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just build # checks syntax, builds the library
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just test # runs a bunch of tests
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just build-website # builds the project website to result/
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just all-examples # builds all of the examples, currently `blog`, `quine` and `art`
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just example blog # builds only the `blog` example
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```
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## License
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MIT 2025 - [@embedding-shapes](https://github.com/embedding-shapes)

‎examples/art/flake.lock‎

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‎examples/art/flake.nix‎

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{
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description = "Generative SVG art example using niccup";
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inputs = {
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niccup.url = "path:../..";
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nixpkgs.follows = "niccup/nixpkgs";
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};
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outputs = { self, nixpkgs, niccup }:
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let
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systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
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forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
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in {
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packages = forAllSystems (system:
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let
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pkgs = import nixpkgs { inherit system; };
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h = niccup.lib;
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# Sierpinski triangle: recursively subdivide into 3 smaller triangles
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sierpinski = depth: x: y: size:
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if depth == 0 then
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let
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# Equilateral triangle pointing up
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x1 = x;
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y1 = y;
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x2 = x + size;
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y2 = y;
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x3 = x + size / 2;
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y3 = y - size * 0.866; # sqrt(3)/2 ≈ 0.866
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in
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[ "polygon" { points = "${toString x1},${toString y1} ${toString x2},${toString y2} ${toString x3},${toString y3}"; } ]
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else
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let
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half = size / 2;
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height = size * 0.866;
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in [
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(sierpinski (depth - 1) x y half)
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(sierpinski (depth - 1) (x + half) y half)
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(sierpinski (depth - 1) (x + half / 2) (y - height / 2) half)
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];
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page = h.renderPretty [
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"html" { lang = "en"; }
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[ "head"
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[ "meta" { charset = "utf-8"; } ]
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[ "title" "Sierpinski Triangle" ]
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[ "style" (h.raw ''
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body { margin: 0; display: flex; justify-content: center; align-items: center; min-height: 100vh; background: #1a1a2e; }
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svg { max-width: 90vmin; max-height: 90vmin; }
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polygon { fill: #e94560; }
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'') ]
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]
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[ "body"
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[ "svg" { viewBox = "0 0 100 90"; xmlns = "http://www.w3.org/2000/svg"; }
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(sierpinski 6 0.0 86.0 100.0)
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]
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]
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];
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indexHtml = pkgs.writeText "index.html" page;
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in {
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default = pkgs.runCommand "art" {} ''
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mkdir -p $out
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cp ${indexHtml} $out/index.html
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'';
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});
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};
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}

‎examples/blog/flake.lock‎

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