Add support for Go templates

[nicolasparada]

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Language

go template

Tree Sitter parser link

https://github.com/ngalaiko/tree-sitter-go-template (not maintained).

Language server link

gopls has some support.

Misc notes

Add support for Go templates. See text/template and html/template.

Right now one can get sort of syntax highlight of HTML, but by doing so it messes and inlines the template interpolation parts.

I also tried using prettier with the go-template plugin and it works to some extend, but its tricky to configure for a non-js project.

[nicolasparada]

For the curious, this is how you can configure zed to use prettier with the go-template plugin:

npm i -g prettier prettier-plugin-go-template

{
  "file_types": {
    "HTML": ["tmpl"]
  },
  "languages": {
    "HTML": {
      "format_on_save": {
        "external": {
          "command": "prettier",
          "arguments": [
            "--stdin-filepath",
            "{buffer_path}",
            "--plugin",
            "/opt/homebrew/lib/node_modules/prettier-plugin-go-template/lib/index.js"
          ]
        }
      }
    }
  }
}

You might want to change /opt/homebrew/lib/node_modules/prettier-plugin-go-template/lib/index.js to whatever path the plugin was installed.