gofumpt

Modify your ~/.config/helix/languages.toml to enable gofumpt via gopls.

[language-server.gopls.config]
"formatting.gofumpt" = true

To use gofumpt in VS Code, enable the language server and configure the gopls settings to use gofumpt formatting.

"go.useLanguageServer": true,
"gopls": {
	"formatting.gofumpt": true,
},

For lsp-mode users (version 8.0.0+):

(setq lsp-go-use-gofumpt t)

For eglot users:

(setq-default eglot-workspace-configuration
 '((:gopls . ((gofumpt . t)))))

Install the gofumpt CLI tool using go install. It requires Go 1.25 or later.

go install mvdan.cc/gofumpt@latest

Install the Sublime Text LSP extension and enable gofumpt in the LSP package settings, ensuring lsp_format_on_save is true.

"lsp_format_on_save": true,
"clients":
{
	"gopls":
	{
		"enabled": true,
		"initializationOptions": {
			"gofumpt": true,
		}
	}
}

If using nvim-lspconfig, pass the gofumpt setting to the gopls setup.

require('lspconfig').gopls.setup({
    settings = {
        gopls = {
            gofumpt = true
        }
    }
})

GoLand requires a custom File Watcher since it does not use gopls. After installing gofumpt, add a new File Watcher with a Custom Template using these settings:

• File Types: .go files
• Scope: Project Files
• Program: Path to your gofumpt executable
• Arguments: -w $FilePath$
• Output path to refresh: $FilePath$
• Working directory: $ProjectFileDir$
• Environment variables: GOROOT=$GOROOT$;GOPATH=$GOPATH$;PATH=$GoBinDirs$

Note: Disable all checkboxes in the 'Advanced' section to avoid unnecessary runs.

Set the gofumpt option in the LSP settings by providing it in initialization_options for gopls.

"lsp": {
  "gopls": {
    "initialization_options": {
      "gofumpt": true
    }
  }
}

To report a formatting bug or get debugging information, insert the //gofumpt:diagnose comment into your Go file. When you run gofumpt on that file, the comment will be rewritten to include version and language information.

//gofumpt:diagnose
package p