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.

server/web/writes.go +5−5

@@ -40,8 +40,8 @@ func (w Web) CreateIssue(rw http.ResponseWriter, r http.Request) {
	40	40	http.Error(rw, "an issue needs a title", http.StatusBadRequest)
	41	41	return
	42	42	}
	43		labels := normalizeLabelSet(append([]string{r.PostFormValue("labels")}, r.PostForm["label"]...))
	44		assignees := metadata.NormalizeAssignees(append([]string{r.PostFormValue("assignees")}, r.PostForm["assignee"]...))
		43	labels := normalizeLabelSet(r.PostForm["label"])
		44	assignees := metadata.NormalizeAssignees(r.PostForm["assignee"])
	45	45	if bad := unknownNames(assignees, w.assignableAccounts(m)); len(bad) > 0 {
	46	46	http.Error(rw, "unknown or unavailable assignee: "+strings.Join(bad, ", "), http.StatusBadRequest)
	47	47	return
@@ -65,7 +65,7 @@ func (w Web) CreateIssue(rw http.ResponseWriter, r http.Request) {
	65	65
	66	66	// SetIssueLabels replaces an issue's labels. Labels are shared state, but the
	67	67	// author may label their own issue; a maintainer may label any issue as triage.
	68		// The form sends existing labels as checkboxes and new ones as free text.
		68	// The form sends labels as hidden inputs written by the chip UI.
	69	69	func (w Web) SetIssueLabels(rw http.ResponseWriter, r http.Request) {
	70	70	ctx, ok := w.beginWrite(rw, r, maxSmallForm)
	71	71	if !ok {
@@ -87,7 +87,7 @@ func (w Web) SetIssueLabels(rw http.ResponseWriter, r http.Request) {
	87	87	labelsView := func(msg string) (string, any) {
	88	88	return "issue_labels", w.issueSidebar(r, m, iss, "", msg)
	89	89	}
	90		labels := normalizeLabelSet(append([]string{r.PostFormValue("labels")}, r.PostForm["label"]...))
		90	labels := normalizeLabelSet(r.PostForm["label"])
	91	91	updated, err := metadata.UpdateIssue(m.Git(), id, func(iss *metadata.Issue) error {
	92	92	if sameStrings(metadata.NormalizeLabels(iss.Labels), labels) {
	93	93	return metadata.ErrNoChange
@@ -134,7 +134,7 @@ func (w Web) SetIssueAssignees(rw http.ResponseWriter, r http.Request) {
	134	134	assigneesView := func(msg string) (string, any) {
	135	135	return "issue_assignees", w.issueSidebar(r, m, iss, "", msg)
	136	136	}
	137		assignees := metadata.NormalizeAssignees(append([]string{r.PostFormValue("assignees")}, r.PostForm["assignee"]...))
		137	assignees := metadata.NormalizeAssignees(r.PostForm["assignee"])
	138	138	// A current assignee may have lost access since being assigned. Keep them in
	139	139	// the allowed set so an edit can remove the others without silently dropping
	140	140	// that name.