proposal: x/tools/cmd/present: add syntax highlighting support via Prism.js

[iamrajiv]

Proposal Details

I would like to propose adding optional syntax highlighting to the present tool.

The Problem

Currently, .code and .play blocks in presentations render as plain text inside <pre> tags. This works fine for small snippets, but for larger blocks of code, the lack of highlighting makes it harder for the audience to parse the logic quickly.

Proposed Solution

I propose integrating Prism.js into the default templates.

I suggest Prism because:

1. It's minimal: We can vendor a build containing only Core + Go support, which is very small (~2KB).
2. No dependencies: It's just a JS file and a CSS file; no complex build pipeline is needed.
3. Progressive enhancement: If the script fails to load or JS is disabled, the code renders as plain text, preserving the current behavior exactly.

Implementation Plan

If accepted, I can submit a CL that:

1. Adds a minified prism.js and a minimal prism.css to the static/ directory.
2. Updates templates/action.tmpl to add the standard class="language-%s" attribute to the <pre> block based on the file extension.
3. Includes the script/css links in the header/footer templates.

This would be a strictly client-side change with no impact on the Go code logic in the server.

Thoughts?

[gabyhelp]

Related Issues

• cmd/present: Add syntax highlighting #5969 (closed)
• Proposal: Add highlight for golang code, golang doc/blog or other document web page #13178 (closed)
• x/tools/cmd/present: add support for quote #30343
• proposal: x/tools/cmd/present: Support presenter notes on the Go present tool #14654 (closed)
• x/playground: add code highlighting #28539 (closed)

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