The markdown editor's YAML front-matter pane was a bare textarea, so authors
had no way to discover the keys the converter honours — notably `doctype:`
(report|letter|specification) and `numbering:`, which have no other source.
Add a single server-side source of truth, convert.RecognizedFrontMatter() +
convert.FrontMatterPlaceholder(), and expose it as JSON at GET /.api/frontmatter
(handler.ServeFrontMatterTemplate; read-only, no auth — leaks only documented
field names). The browse editor fetches it once (server mode) and sets the
front-matter textarea's placeholder to the greyed hint, so an empty pane shows
the recognized keys with one-line hints. It's placeholder-only: it inserts
nothing, vanishes on the first keystroke, and arbitrary keys remain free —
front matter is still passed through to pandoc untouched. file:// mode shows no
placeholder (conversion is server-only).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Generalize the conversion engine from markdown-source-only to a (from→to)
dispatcher, convert.Convert, supporting:
md → docx | html | pdf
docx → md | html
html → md | docx
- convertToMarkdown (docx→md, html→md): pandoc -t gfm --wrap=none with an
embedded inline-media.lua filter that base64-inlines mediabag images as data:
URIs, so the output .md is self-contained (markdown has no --embed-resources).
- convertToHTML now takes a source format: docx→html reuses the doctype template
and --embed-resources base64-inlines the docx's images automatically.
- convertToDocx takes a source format: html→docx embeds images natively.
- ToDocx/ToHTML/ToPDF are kept as the md-source entry points, delegating to the
shared internals. writeScratchFiles generalizes the old template-set writer.
Routing (converthandler.go):
- RecognizeVirtualConvert maps any target ext {md,docx,html,pdf} to the first
existing real sibling source by precedence (md←docx,html; docx←md,html;
html←md,docx; pdf←md). Real files still win (dispatcher stats first).
- ServeConverted accepts md; buildAndStore dispatches on (ext(src), format) via
convert.Convert; purgeConverted clears all derived siblings on any write.
Tests: per-direction command-shape assertions (convert) + recognizer matrix and
precedence (handler). Verified end-to-end with real pandoc (docx→md/html,
html→md/docx, base64 images). Full ./... suite green.
PDF stays markdown-only for now (docx/html→pdf would need a two-stage hop).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
