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Document Compilation & Pipelines

The Renderer workspace features a highly flexible and extensible Markdown template compilation engine designed to combine dynamic SVG graphic elements, base64-encoded typography, and token-interpolated textual files.

Extensible Pipeline Flow​

The engine compiles documents using decoupled pipelines conforming to the Open/Closed Principle (SOLID). Standard pipelines, such as the github-profile.pipeline.ts, orchestrate the document compilation process:

  1. Pipeline Execution: The main runner (src/index.ts) launches the registered active pipelines.
  2. Template Parsing: Reads raw templates, such as src/templates/docs/README.template.md and the SVG card templates.
  3. Token Substitution: Scans for double curly brace placeholders (\{\{ variable \}\}) and replaces them with data resolved by the pipeline.
  4. Typography Encoding: Base64-encodes the local Nunito font file, inlining it as an embedded @font-face within SVG elements. This bypasses GitHub's strict HTML image sandbox and renders text with pixel-perfect brand fidelity.
  5. Writing Output: Compiles and outputs both flat SVG cards and final textual .md files to the monorepo root or package target directories.

Token Reference​

The following placeholders are supported inside the standard README template and are substituted dynamically:

  • \{\{ name \}\}: The developer's display name or login.
  • \{\{ user \}\}: The GitHub username/login.
  • \{\{ contributions \}\}: Total commits, issues, pull requests, and code reviews.
  • \{\{ stars \}\}: Aggregated stargazers count across all counted repositories.
  • \{\{ forks \}\}: Aggregated fork count across all counted repositories.
  • \{\{ lines_changed \}\}: Aggregated additions and deletions of code.
  • \{\{ views \}\}: Sum of traffic views from the past two weeks.
  • \{\{ repos \}\}: Number of active repositories contributed to.

Dual-Theme HTML Picture Integration​

To support GitHub's light and dark color schemes natively within a single markdown document, the compiled README.md utilizes standard HTML <picture> elements.

During compilation, the pipeline outputs separate light and dark SVGs to generated/cards/ (flat flat copies: overview-light.svg, overview-dark.svg, header-light.svg, header-dark.svg), which are embedded in the markdown as follows:

<picture>
  <source
    media="(prefers-color-scheme: dark)"
    srcset="./renderer/generated/cards/overview-dark.svg"
  />
  <source
    media="(prefers-color-scheme: light)"
    srcset="./renderer/generated/cards/overview-light.svg"
  />
  <img alt="GitHub Stats" src="./renderer/generated/cards/overview-light.svg" height="200px" />
</picture>

When GitHub renders the profile page:

  • Dark Mode: Resolves to the overview-dark.svg card, rendering dark background and token-based colors.
  • Light Mode: Resolves to the overview-light.svg card, displaying high-contrast light colors.
  • This approach avoids using fragile URL hashes (#gh-dark-mode-only) and relies on native, clean file isolation for absolute rendering safety.