vole

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Highlight with Prism in a worker and gzip text responses

306f36fcef89c145abcd0c5331453d0b179f37ce · Keenan Nemetz · 12d ago · parent e5542ac6

Highlight with Prism in a worker and gzip text responses

The code browser now names a blob's language and lets the browser colour it.
Chroma is gone: server/web/highlight.go is an extension table, and
static/prism-worker.js runs Prism — every language Prism ships — off the main
thread. The server sends escaped lines with their numbers and L# anchors, so a
page is complete and scrollable before any script runs and the worker only swaps
the contents of each line cell. The table covers 186 languages; a file it does
not claim stays plain rather than being coloured by a guess.

The bundle those grammars make is 545 KB, so the instance now gzips text
responses itself instead of relying on a proxy, and static assets carry a
content ETag so a browser revalidates with a 304 rather than re-downloading the
bundle on every code page. The raw-download route opts out with
Cache-Control: no-transform because it promises an exact Content-Length.

This also makes JavaScript a requirement rather than a nicety: the label and
assignee token inputs lose their noscript save buttons and their comma-separated
text fallback, and the docs say so.

Measured: release binary 26.08 MB -> 22.70 MB; /r/{repo}/code 11.1 KB -> 2.6 KB
over the wire; the Prism bundle 545 KB -> 206 KB gzipped, fetched once.

scripts/vendor-prism.py regenerates the bundle from Prism's components.json
require graph, and --check fails if the committed assets drift.

docs/ui-plan.md +12−5

@@ -13,11 +13,12 @@ deliberately rather than by drift.
	13	13	A light theme is a second block of variables, not a rewrite; it currently
	14	14	follows the operating system's `prefers-color-scheme`.
	15	15	- Server rendered. Go `html/template` produces the page. HTMX is the default
	16		dynamic layer, vendored into the binary; JavaScript remains for passkeys,
	17		clipboard copy, and rich widgets such as the label/assignee token input.
	18		No SPA, no client-side router, no npm build.
	19		- Progressive enhancement. Forms keep a normal `method`/`action` fallback.
	20		Handlers answer a fragment when `HX-Request: true` and a redirect otherwise.
		16	dynamic layer, vendored into the binary; JavaScript is required — passkeys,
		17	clipboard copy, and rich widgets such as the label/assignee token input all
		18	need it. No SPA, no client-side router, no npm build.
		19	- JavaScript required. There is no no-script fallback: a browser without
		20	JavaScript gets a page it cannot operate. Forms post through HTMX, and handlers
		21	answer a fragment when `HX-Request: true` and a redirect otherwise.
	21	22	- Identity later. Keep the `vole` wordmark as a placeholder and keep colour,
	22	23	type, radius, and spacing in tokens so a real identity is a token swap.
	23	24	- Single tenant. No organisation/workspace switcher. The global bar has one
@@ -57,6 +58,12 @@ pane width. The branch crumb returns to the Code overview rather than opening a
	57	58	second directory listing. Settings appears for the viewer when the repository
	58	59	ACL gives them the admin role.
	59	60
		61	A blob is served as escaped lines with their numbers and `id="L<n>"` anchors, and
		62	the browser colours it: `static/prism-worker.js` holds Prism and every language it
		63	ships, so the server names the language (an extension table, not a detector) and
		64	does no lexing. The worker starts only on a page with a blob; a file the table
		65	does not claim is served plain.
		66
	60	67	## Surfaces
	61	68
	62	69	Status: `done` exists today · `wip` in progress · `todo` missing.