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Slideshow Export

Status: shipped in Phase 0.11 · Issue: #12 · Depends on: #11 Publish to GitHub Pages

Convert any markdown file into a reveal.js slideshow — preview locally inside a VSCode webview, or publish to the warehouse repo's pages branch and share a public URL. Slide breaks come from the standard --- markdown HR (which doubles as reveal.js's slide separator); vertical slides use --.

At a glance


Engine	reveal.js v5 (loaded from JSDelivr at view time — no bundle bloat)
Slide breaks	`---` (horizontal), `--` (vertical / nested)
Frontmatter	YAML-style at top of file: `theme`, `transition`, `title`, `speakerNotes`
Local preview	`Mark It Down: Slideshow: Preview Local` opens a webview panel beside the editor
Publish	`Mark It Down: Slideshow: Publish` reuses the F10 publish pipeline; pushes a single HTML to `<publish-branch>/<publish-path>/slides/<basename>.html`
Speaker notes	`Notes:` line in a slide body — everything after becomes `<aside class="notes">`

Authoring

A minimal slide deck:

markdown

That's a 4-slide deck (one is a vertical sub-slide).

Local preview

Mark It Down: Slideshow: Preview Local opens a webview panel beside the editor and renders the deck. Standard reveal.js controls apply — arrow keys, f for fullscreen, s for speaker view, o for the overview grid, ? for the help cheatsheet.

The preview panel uses a permissive CSP (loads reveal.js, mermaid, highlight.js CSS from JSDelivr at view time). The CSP relaxation is scoped to the slideshow panel only — the main custom editor's CSP stays strict.

The preview is a one-shot render — edit the markdown and re-run the command to see updates. Live reload on save is a future-work seed.

Publish

Mark It Down: Slideshow: Publish:

Renders the active markdown with the configured theme/transition.
Reuses the F10 publish pipeline's git-worktree-against-warehouse approach.
Pushes the rendered HTML to <publish-branch>/<publish-path>/slides/<basename>.html (defaults: gh-pages, root, slugified file basename).
Surfaces an info toast with Open and Copy URL actions.

Requires both markItDown.warehouse.repo and markItDown.publish.enabled to be set — slideshow publish is a layered feature on top of F9 + F10.

Settings

Setting	Default	What it does
`markItDown.slideshow.theme`	`"black"`	Reveal.js theme. Built-ins: `black, white, league, beige, night, serif, simple, solarized, moon, dracula, sky, blood`. Frontmatter `theme:` overrides per-deck.
`markItDown.slideshow.transition`	`"slide"`	`none / fade / slide / convex / concave / zoom`. Frontmatter `transition:` overrides per-deck.
`markItDown.slideshow.includeSpeakerNotes`	`true`	Render lines after `Notes:` as reveal speaker notes.

Frontmatter reference

A YAML-ish block at the very top of the markdown file (between two --- lines) sets per-deck options. Recognized keys:

Key	Type	Default
`title`	string	filename basename
`theme`	string	settings value (`black`)
`transition`	string	settings value (`slide`)
`speakerNotes`	boolean	settings value (`true`)

Unknown keys are ignored.

Speaker notes

Anywhere in a slide body, a line starting with Notes: flips everything after it into the slide's speaker notes. They show in reveal's speaker view (s key) — never in the main slide.

markdown

Mermaid + code highlighting in slides

Mermaid: any ```mermaid block becomes a <div class="mermaid"> in the rendered slide; mermaid loads from CDN at view time and renders with the matching theme (dark for dark reveal themes, default otherwise).
Code blocks: highlight.js's atom-one-dark theme is loaded from CDN. The reveal.js highlight plugin can be added later for per-line stepping.

PDF export

The Slideshow: Export to PDF command currently surfaces an info message pointing at reveal.js's built-in PDF print mode — append ?print-pdf to the published URL and use the browser's "Save as PDF" Print dialog. Bundling a headless chromium for in-process PDF generation is out of scope (would push the .vsix size past 150MB). Tracked as future work.

Edge cases

No --- separators: the whole file becomes one slide. Useful for single-slide quick previews.
Frontmatter without closing ---: not detected; the leading --- becomes a slide break and the would-be frontmatter renders as the first slide. Make sure the closing --- is on its own line followed by \n.
Markdown HR vs slide break ambiguity: any --- on its own line between two blank lines becomes a slide break. Inline HRs (e.g. inside a list) are not affected.
Publish without warehouse / publish disabled: surfaces a clear message with an Open Settings action.
Cross-deck shared assets: each slideshow ships with its own CDN references; nothing is shared between published slideshows. This means each one is fully self-contained.
CSP: the local preview uses a permissive CSP scoped to the slideshow panel. The main custom editor's strict CSP is unchanged.

Files of interest

src/slideshow/slideshowGenerator.ts — buildSlideshow parses frontmatter, splits slides, renders each via marked, wraps in reveal.js HTML; template() emits the full HTML page with reveal.js + mermaid + highlight.js loaded from JSDelivr
src/slideshow/slideshowManager.ts — previewLocal (webview panel), publish (warehouse worktree + write + commit + push), copyShareUrl, exportPdf (defer notice)
src/slideshow/slideshowCommands.ts — 4 VSCode command registrations
src/extension.ts — wires SlideshowManager + commands on activation
package.json — 4 commands + 3 markItDown.slideshow.* settings