Hwaro::Services::Exporters::JekyllExporter

Matches the date/timestamp shapes Jekyll's YAML loader reads natively; anything else is emitted via yaml_scalar — raw interpolation of an arbitrary string into date: let a newline or : inject or break the frontmatter.

Keys the explicit emitters below may claim; everything else passes through as a Jekyll page variable (Jekyll accepts arbitrary front-matter keys, so dropping slug, weight, layout, extra.*, … was silent data loss — the same bug class gh#527 fixed for the Hugo exporter). A key is only excluded from the passthrough when its emitter actually produced a line: a value the emitter cannot represent (hash-valued tags, array title, …) used to be swallowed — skipped by the emitter AND skipped by name here.

Top-level sections whose dated content maps to Jekyll's _posts/ collection. posts is what the Jekyll importer itself produces (round-trip symmetric) and blog is the other common Hwaro layout. Membership in one of these sections — not the mere presence of a date — is what makes a file a blog post: Hwaro auto-stamps date on every hwaro new page, so "has a date" alone misclassified ordinary pages (about.md, deep section pages) as posts.