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📕 Community templates

A template capable of rendering markdown from a given template file.

Community templates are a way to use official releases of lowlighter/metrics while using templates from external repositories (owned or not).

📮 Using community templates

Use setup_community_templates option to specify additional external sources using following format:

user/repo@branch:template

These templates will be downloaded through git and will be usable by prefixing their name with an @.

Example: using my-theme template by downloading it from user/repo

- uses: lowlighter/metrics@latest
  with:
    template: "@my-theme"
    setup_community_templates: "user/repo@main:my-theme"

For security reasons, community templates will use the classic template template.mjs instead of their own. If you trust a community template, append +trust to it.

Example: using and trusting my-theme template by downloading it from user/repo

- uses: lowlighter/metrics@latest
  with:
    template: "@my-theme"
    setup_community_templates: "user/repo@main:my-theme+trust"

⚠️ Note that it basically allow remote code execution and the template may have access to sensitive data along with tokens! Use this feature only from a trusted source. Remember that its content may also change at any time...

Some templates may accept additional custom parameters that can be passed through the query option, using a JSON formatted string.

Example: using and trusting my-theme template by downloading it from user/repo

- uses: lowlighter/metrics@latest
  with:
    template: "@my-theme"
    query: |
      {
        "header_color": "#FF0000"
      }

ℹ️ Examples workflows

name: Using a community template
uses: lowlighter/metrics@latest
with:
  token: ${{ secrets.METRICS_TOKEN }}
  template: "@classic"
  setup_community_templates: lowlighter/metrics@master:classic

name: Using a trusted community template
uses: lowlighter/metrics@latest
with:
  token: ${{ secrets.METRICS_TOKEN }}
  template: "@terminal"
  setup_community_templates: lowlighter/metrics@master:terminal+trust

📪 Creating community templates

Templates creation requires you to be comfortable with HTML, CSS and EJS.

💬 Quick-start

To create a new template, clone and setup this repository first:

git clone https://github.com/lowlighter/metrics.git
cd metrics/
npm install

Find a cool name for your new template and run the following:

npm run quickstart template <template_name>

It will create a new directory in /source/templates with the following file structure:

  • /source/templates/{template-name}
    • README.md
    • metadata.yml
    • image.svg
    • partials/
      • _.json
      • *.ejs

Templates are auto-loaded based on their folder existence, so there's no need to register them somewhere.

💬 Understanding image.svg

Usually image.svg doesn't need to be edited too much, but let's explain it how it works.

<svg xmlns="http://www.w3.org/2000/svg" width="480" height="99999" class="<%= !animated ? 'no-animations' : '' %>">

  <defs><style><%= fonts %></style></defs>
  <style data-optimizable="true"><%= style %></style>

  <foreignObject x="0" y="0" width="100%" height="100%">
    <div xmlns="http://www.w3.org/1999/xhtml" xmlns:xlink="http://www.w3.org/1999/xlink">
      <% for (const partial of [...partials]) { %>
        <%- await include(`partials/${partial}.ejs`) %>
      <% } %>

      <div id="metrics-end"></div>
    </div>
  </foreignObject>

</svg>

ℹ️ EJS syntax

EJS framework is used to programmatically create content through the help of templating tags (<% %>).

ℹ️ Styling

fonts and style variables are respectively populated with fonts.css and styles.css files content (or will fallback to those of classic template inexistent).

These will define the global design of the output.

data-optimizable="true" tells that a style tag can be safely minified and purged by CSS post-processors.

ℹ️ Partials

partials variable is populated with partials/_.json file content and define which files should be included along with default ordering.

The loop iterates over this array to include all defined partials. Each partial should handle whether it should be displayed by itself.

ℹ️ #metrics-end tag

#metrics-end is a special HTML tag which must remain at the bottom of SVG template.

It is used to compute height dynamically through a puppeteer headless instance. Initial height should remain a high number so it doesn't get cropped accidentally while puppeteer compute element.getBoundingClientRect().

💬 Filling metadata.yml

metadata.yml is a required file which describes supported account types, output formats, scopes, etc.

The default file looks like below:

name: 🖼️ Template name
extends: classic
description: |
  Short description
examples:
  default: https://via.placeholder.com/468x60?text=No%20preview%20available
supports:
  - user
  - organization
  - repository
formats:
  - svg
  - png
  - jpeg
  - json
  - markdown
  - markdown-pdf

💡 It is important to correctly define metadata.yml because metrics will use its content for various usage

🧱 core plugin (which is always called) will automatically verify user inputs against supports and formats values and throw an error in case of incompatibility.

extends is used to define the fallback for template.mjs when a template is not trusted by user (depending on whether you're building an user/organization or repository template, it is advised to either use classic or repository).

name, description and examples are used to auto-generate documentation in the README.md.

💬 Filling examples.yml

Workflow examples from examples.yml are used to auto-generate documentation in the README.md.

💬 Filling README.md

README.md is used as documentation.

Most of it will is auto-generated by metadata.yml and examples.yml content, so usually it is not required to manually edit it.

The default content looks like below:

<ǃ--header-->
<ǃ--/header-->

## ℹ️ Examples workflows

<ǃ--examples-->
<ǃ--/examples-->
  • <ǃ--header--> will be replaced by an auto-generated header containing template name, supported features and output examples based on metadata.yml
  • <ǃ--examples--> will be replaced by workflows from examples.yml

💬 Creating partials

Just create a new .ejs file in partials folder, and reference it into partials/_.json.

It should be able to handle gracefully plugins state and errors.

Below is a minimal snippet of a partial:

<% if (plugins.{plugin_name}) { %>
  <% if (plugins.{plugin_name}.error) { %>
    <%= plugins.{plugin_name}.error.message %>
  <% } else { %>
    <%# content %>
  <% } %>
<% } %>

Partials should have the match the same name as plugin handles, as they're used to display plugin compatibility in auto-generated header.

💬 Adding custom fonts

⚠️ This significantly increases rendered metrics filesize and thus not recommended. You should restrict charset when using this feature

Here's a quick step-by-step tutorial to create base64 encoded fonts:

    1. Find a font on fonts.google.com
    • Select regular, bold, italic and bold+italic fonts
    • Open embed tab and extract href
    1. Open extracted href in a browser and append &text= parameter with list of used characters
    • e.g. &text=0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
    1. Download each font file from urls present in generated stylesheet
    1. Convert them into base64 with woff format on transfonter.org
    1. Download archive and extract it
    1. Copy content of generated stylesheet to fonts.css
    1. Update style.css to use the new font