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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/tokens.go +7−9

@@ -1,9 +1,8 @@
1 1 package web
2 2
3 // The two token inputs: labels and assignees. Both are a set of names stored in
4 // a form field, with a text fallback for a browser without JavaScript and a chip
5 // UI (static/app.js) when it has one, so the parsing and normalising of that set
6 // lives here rather than beside either issue page.
3 // The two token inputs: labels and assignees. Both are a set of names the chip UI
4 // (static/app.js) writes into hidden form fields, so the parsing and normalising
5 // of that set lives here rather than beside either issue page.
7 6
8 7 import (
9 8 "sort"
@@ -14,18 +13,17 @@ import (
14 13 )
15 14
16 15 // tokenPickerData is the small view model behind the token input. It is used for
17 // labels and assignees: Selected is the current set, All is what to suggest, and
18 // Field/Item name the form values the browser and the no-JS fallback submit.
16 // labels and assignees: Selected seeds the current set, All is what to suggest,
17 // and Item names the hidden form field the chip UI writes.
19 18 type tokenPickerData struct {
20 19 Selected []string
21 20 All []string
22 Field string
23 21 Item string
24 22 Placeholder string
25 23 }
26 24
27 func tokenPicker(selected, all []string, field, item, placeholder string) tokenPickerData {
28 return tokenPickerData{Selected: selected, All: all, Field: field, Item: item, Placeholder: placeholder}
25 func tokenPicker(selected, all []string, item, placeholder string) tokenPickerData {
26 return tokenPickerData{Selected: selected, All: all, Item: item, Placeholder: placeholder}
29 27 }
30 28
31 29 // assignableAccounts lists active accounts that can see this repository. A