languages.toml: gotmpl grammar source (dannylongeuay/tree-sitter-go-template) returns 404

[holopanen]

The gotmpl grammar entry in languages.toml points to a repository that no longer exists:

[[grammar]]
name = "gotmpl"
source = { git = "https://github.com/dannylongeuay/tree-sitter-go-template", rev = "395a33e08e69f4155156f0b90138a6c86764c979" }

curl -s -o /dev/null -w "%{http_code}\n" https://github.com/dannylongeuay/tree-sitter-go-template returns 404.

Confirmed on Fedora's packaged helix 25.07.1-11.fc44 (hx --grammar fetch).

Impact: hx --grammar fetch doesn't fail cleanly on the dead repo — it drops into a credential prompt ("Username for 'https://github.com'"), which hangs any non-interactive invocation (e.g. topgrade, CI, scripted grammar updates) instead of skipping or erroring out.

Steps to reproduce:

1. hx --grammar fetch on a fresh config (no local languages.toml override)
2. Observe it prompts for a GitHub username instead of failing

Workaround: excluding the grammar via a user languages.toml:

use-grammars = { except = ["gotmpl"] }

Two separate things worth fixing:

1. The dead/renamed source for gotmpl in languages.toml.
2. libgit2-backed fetch falling back to an auth prompt on a 404 instead of failing immediately — this turns any single broken grammar entry into a silent hang for non-interactive tooling.

[RoloEdits]

libgit2-backed fetch

For fetching grammar we go through the git cli, so I am guessing this is entirely AI generated (among the other initiators).

I believe this was fixed on master directly already (#14746), but also there was a change to the way the fetching errors out and fails (#15548) so that (hopefully) grammar issues don't become an over-sized issue for a small amount of affected grammar.