add blog post about github actions docs

input/blog/2024/2024_05_05_auto_project_docs.md

+title: Blog
+post: Auto-generated project docs with 3D preview
+description: For KiCad PCBs and STL files, made with mdBook
+date: 2024-05-05
+---
+
+I recurring problem I ran into with my projects is documentation.
+Especially with 3D printed parts or PCBs it's often required to generate preview images or PDFs so someone interested can take a look without having to clone the repo and install some development tools to open the original files.
+Doing this manually is time-consuming and repetitive.
+So it should be automated.
+
+I've come across a couple of similar projects recently, like [this](https://hackaday.com/2024/05/04/giving-your-kicad-pcb-repository-pretty-pictures/) or [these](https://hackaday.com/2024/03/11/share-your-projects-kicad-automations-and-pretty-renders/).
+But they mostly spit out non-interactive images.
+So I've decided to go a slightly different and more interactive route.
+
+<!--%
+lightgallery([
+    [ "img/github_pages_sch.png", "2D KiCad board visualization" ],
+    [ "img/github_pages_pcb.png", "3D KiCad board visualization" ],
+    [ "img/github_pages_stl.png", "3D STL visualization" ],
+])
+%-->
+
+Using [GitHub Actions](https://docs.github.com/en/actions) and [GitHub Pages](https://docs.github.com/en/pages), I'm creating a static documentation website using [mdBook](https://rust-lang.github.io/mdBook/).
+To visualize KiCad schematics and 2D board designs I'm exporting them as svg images and display them interactively using [svg-pan-zoom](https://github.com/bumbu/svg-pan-zoom).
+KiCad PCBs are also exported in 3D as VRML files and displayed using [three.js](https://threejs.org/).
+
+To generate these files I'm mostly using shell scripts in the project repository.
+
+* `generate_stls.sh` is creating STL files from OpenSCAD sources
+* `generate_fab.sh` is creating Gerber files to order PCBs
+* `generate_plot.sh` is creating the 2D and 3D files for KiCad projects
+* `generate_docs.sh` is creating the static website using the output from the previous scripts
+
+Then the workflows can be kept relatively short, just installing the required dependencies, running the proper script and putting the resulting files where they are needed.
+This way the coupling to the proprietary GitHub features is not that thight and can hopefully be ported to other providers with relative ease.
+
+* `cmake.yml` is creating firmware archives (also usable for OTA updates)
+* `scad.yml` to create the STL files
+* `kicad.yml` to generate board gerber files
+* `docs.yml` to create the static documentation pages
+
+The whole workflow is relatively customizable.
+So for some projects I'm for example creating special board previews for etching PCBs at home.
+
+I've implemented this workflow in a couple of projects now:
+
+* [OpenAutoLab](https://kauzerei.github.io/openautolab/) ([Repo](https://github.com/kauzerei/openautolab))
+* [LARS](https://xythobuz.github.io/lars/) ([Repo](https://github.com/xythobuz/lars))
+* [Dispensy](https://drinkrobotics.github.io/dispensy/) ([Repo](https://github.com/drinkrobotics/dispensy))
+* [Tritonmischer](https://kauzerei.github.io/tritonmischer/) ([Repo](https://github.com/kauzerei/tritonmischer))
+
+Take a look there for the implementation details.
+
+## Example Implementation
+
+Here are the basics to get you started.
+
+#### 1) mdBook dependency
+
+Fetch the [pre-built mdBook binary](https://github.com/rust-lang/mdBook/releases) and place it in your PATH.
+
+#### 2) mdBook initialization
+
+Add a [docs](https://github.com/xythobuz/lars/tree/master/docs) directory to your project, either by copying it from one of my repos, or creating a new one and adapting the resulting `book.toml` config.
+
+    mdbook init docs
+
+#### 3) svg-pan-zoom dependency
+
+If you want to visualize SVG images for KiCad schematics and boards, add svg-pan-zoom as a subrepo.
+
+    cd docs
+    git submodule add https://github.com/bumbu/svg-pan-zoom
+    mkdir -p src/js
+    cd src/js
+    ln -s ../../svg-pan-zoom/dist/svg-pan-zoom.js svg-pan-zoom.js
+    ln -s ../../svg-pan-zoom/dist/svg-pan-zoom.min.js svg-pan-zoom.min.js
+
+#### 4) Generating docs
+
+Add the `docs/generate_docs.sh` script and adapt the config and calls to other script at the beginning, as needed for your project:
+
+<!-- https://clay-atlas.com/us/blog/2021/06/30/html-en-copy-text-button/ -->
+<script>
+function copyEvent(id) {
+    var str = document.getElementById(id);
+    window.getSelection().selectAllChildren(str);
+    document.execCommand("Copy")
+}
+</script>
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/docs/generate_docs.sh) is an example `generate_docs.sh` file.
+<button type="button" onclick="copyEvent('generatedocs')" class="clip-btn">Copy 'generate_docs.sh' to clipboard</button>
+
+<pre id="generatedocs" class="sh_sh">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/docs/generate_docs.sh")
+%-->
+</pre>
+
+#### 5) Auto-generating and publishing docs
+
+Add the `.github/workflows/docs.yml` script:
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/docs.yml) is an example `docs.yml` file.
+<button type="button" onclick="copyEvent('docsyml')" class="clip-btn">Copy 'docs.yml' to clipboard</button>
+
+<pre id="docsyml" class="sh_yaml">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/docs.yml")
+%-->
+</pre>
+
+And don't forget to set the GitHub Pages source in the repo settings to GitHub Actions:
+
+<!--%
+lightgallery([
+    [ "img/github_pages_actions.png", "What to change in the GitHub repo settings" ],
+])
+%-->
+
+#### 6) STL 3D visualization
+
+If you want to visualize 3D print files, do the same with `3dprint/generate_stls.sh` and `.github/workflows/scad.yml`:
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/3dprint/generate_stls.sh) is an example `generate_stls.sh` file.
+<button type="button" onclick="copyEvent('generatestls')" class="clip-btn">Copy 'generate_stls.sh' to clipboard</button>
+
+<pre id="generatestls" class="sh_sh">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/3dprint/generate_stls.sh")
+%-->
+</pre>
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/scad.yml) is an example `scad.yml` file.
+<button type="button" onclick="copyEvent('scadyml')" class="clip-btn">Copy 'scad.yml' to clipboard</button>
+
+<pre id="scadyml" class="sh_yaml">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/scad.yml")
+%-->
+</pre>
+
+And then add something like this to the mdBook sources where you want the visualization to appear:
+
+    \{{#include inc_enclosure_bottom.stl.md}}
+
+    [Direct link to this file](./stl/enclosure_bottom.stl).
+
+#### 7) PCB gerber files
+
+If you want to generate gerber files from PCBs, do something similar with `pcb/generate_fab.sh` and `.github/workflows/kicad.yml`:
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/pcb2/generate_fab.sh) is an example `generate_fab.sh` file.
+<button type="button" onclick="copyEvent('generatefab')" class="clip-btn">Copy 'generate_fab.sh' to clipboard</button>
+
+<pre id="generatefab" class="sh_sh">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/pcb2/generate_fab.sh")
+%-->
+</pre>
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/kicad.yml) is an example `kicad.yml` file.
+<button type="button" onclick="copyEvent('kicadyml')" class="clip-btn">Copy 'kicad.yml' to clipboard</button>
+
+<pre id="kicadyml" class="sh_yaml">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/.github/workflows/kicad.yml")
+%-->
+</pre>
+
+#### 8) PCB visualization
+
+If you want to visualize KiCad schematics and PCBs in 2D and 3D, add `pcb/generate_plot.sh`:
+
+[Here](https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/pcb2/generate_plot.sh) is an example `generate_plot.sh` file.
+<button type="button" onclick="copyEvent('generateplot')" class="clip-btn">Copy 'generate_plot.sh' to clipboard</button>
+
+<pre id="generateplot" class="sh_sh">
+<!--%
+include_url("https://git.xythobuz.de/thomas/drumkit/raw/commit/314bf218ca5e958d6ffa825d92d702cb5431abf6/pcb2/generate_plot.sh")
+%-->
+</pre>
+
+Then include this where you want the 2D schematic visualization to appear:
+
+    You can also view the [schematics as PDF](./plot/lars2.kicad_sch.pdf).
+
+    \{{#include inc_lars2.kicad_sch.md}}
+
+And this where you want to visualize the 2D PCB layout:
+
+    You can also view the [2D PCB layout as PDF](./plot/lars2.kicad_pcb.pdf).
+
+    <script src="js/svg-pan-zoom.js" charset="UTF-8"></script>
+    <div style="background-color: white; border: 1px solid black;">
+        <embed type="image/svg+xml" src="./plot/lars2.kicad_pcb.svg" id="pz_drumkit0" style="width: 100%;"/>
+        <script>
+            document.getElementById('pz_drumkit0').addEventListener('load', function(){
+                svgPanZoom(document.getElementById('pz_drumkit0'), {controlIconsEnabled: true, minZoom: 1.0});
+            })
+        </script>
+    </div>
+
+    [Direct link to this file](./plot/lars2.kicad_pcb.svg).
+
+And add this where you want to visualize the 3D PCB layout:
+
+    \{{#include inc_lars2.kicad_pcb.md}}
+
+That should more or less be all that's required.
+
+Of course, adapt paths as needed to match your project layout.
+And test locally by calling the scripts manually on your machine:
+
+    ./pcb/generate_plot.sh
+    ./3dprint/generate_stls.sh
+
+    ./docs/generate_docs.sh serve
+
+Hope this helps.