WORK-255
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ID:WORK-255Status:ready

Snippet rune

The snippet rune renders the contents of a file (path relative to the project root) as a syntax-highlighted code block. Solves the recurring "docs example drifts from source" problem and incidentally enables the view-source-of-current-page pattern via {% snippet path=$file.path /%}. Lives in @refrakt-md/docs.

Priority:mediumComplexity:moderateMilestone:v0.15.0Source:SPEC-062
claude/modal-drawer-pattern-a1Wgb View source

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Implements 1
Related 5
Branches 4
claude/modal-drawer-pattern-a1Wgb current ready
main doneclaude/v0.15.0-phase-2 doneclaude/v0.15.0-phase-1 readyclaude/v0.15.0 done
History 1
  1. c15804e
    Created (ready)by bjornolofandersson

Acceptance Criteria

  • {% snippet path="..." /%} reads the file from project root and renders it as a syntax-highlighted code block
  • Paths are resolved relative to the directory containing refrakt.config.json
  • Absolute paths (/etc/passwd) are rejected with a build error
  • Traversal paths (../../foo) escaping project root are rejected with a build error
  • Symlinks pointing outside project root are rejected with a build error
  • Missing files produce a build error naming the resolved path and the referencing source location
  • Directory paths are rejected with a build error
  • lines="10-25" extracts lines 10–25 inclusive
  • lines="10-" extracts from line 10 to end of file
  • lines="-20" extracts from line 1 to line 20
  • lines="10" extracts just line 10
  • Out-of-range end clamps to file length with a build warning
  • Out-of-range start (entirely past EOF) is a build error
  • Inverted range ("25-10") is a build error
  • Malformed range string is a build error with the input echoed
  • Language is inferred from file extension via the shared lang-map module from WORK-254
  • lang= overrides inferred language
  • title= renders as a caption in .rf-snippet__title
  • data-source-path is set on the wrapper to the resolved path (relative to project root)
  • data-lines is set when lines= is used
  • {% snippet path=$file.path /%} works end-to-end (project-root frame matches the sandbox)
  • CSS in the docs plugin covers .rf-snippet* selectors
  • Authoring docs cover the rune, sandbox rules, line range syntax, language inference table

Approach

Per the spec's Engine Changes section:

  • plugins/docs/src/runes/snippet.ts — rune schema (createContentModelSchema)
  • plugins/docs/src/lib/read-file.ts — file-reading utility with sandbox enforcement (absolute-path reject, traversal reject, symlink reject, existence check) and line-range slicing
  • Plugin's theme.runes adds the Snippet config entry
  • CSS in plugins/docs/styles/snippet.css
  • Output produces the same internal Markdoc node shape as a fenced code block (so existing rendering picks it up) plus the snippet wrapper

Project-root resolution helper is reusable by future file-reading runes; placement at plugins/docs/src/lib/ for now, can be promoted to a shared module if more consumers appear.

Dependencies

  • WORK-249 — $file.path (for the view-source-of-current-page pattern)
  • WORK-254 — shared lang-map module

References

  • SPEC-062 — snippet-rune spec (full)
  • SPEC-060 — drawer rune (composes for view-source pattern)
  • SPEC-068 — deferred HMR follow-up for referenced-file watching
  • packages/lumina/styles/runes/code-block.css — existing code-block CSS to compose with