Cobra-Prompt Plus (Comptplus)

A production-ready fork of Cobra Prompt that turns any Cobra CLI into a rich interactive shell with syntax highlighting, fuzzy completions, and proper shell semantics.

Built on elk-language/go-prompt, an actively maintained fork of go-prompt with critical bug fixes (Ctrl+C handling, terminal restoration, grapheme support).

Used by

• IONOS Cloud CLI (ionosctl)

What's different from cobra-prompt?

The original cobra-prompt is unmaintained and has several critical bugs. Comptplus fixes all of them and adds features needed for production CLIs:

• Syntax highlighting: commands, flags, values, and errors are colorized as you type via a cobra-aware lexer
• Fuzzy completions: type dpl to match deploy, powered by go-prompt's fuzzy filter
• Flag value completions: auto-complete flag values with caching and optional async (non-blocking) fetching
• Shell-aware parsing: quoted arguments (--name "John Oliver") work correctly via go-shellquote
• Proper cobra integration: uses SetArgs() instead of os.Args, passes resolved *cobra.Command to callbacks
• Graceful error handling: errors print and return to the prompt instead of calling os.Exit(1)
• Hooks and customization: pre/post execution hooks, custom flag reset logic, dynamic prefix, key bindings, and more

See the CHANGELOG for the full version history.

Getting started

go get github.com/ionoscloudsdk/comptplus

package main

import (
    "github.com/elk-language/go-prompt"
    "github.com/ionoscloudsdk/comptplus"
)

func main() {
    lexer := comptplus.NewCobraLexer(rootCmd)

    cp := &comptplus.CobraPrompt{
        RootCmd:               rootCmd,
        AddDefaultExitCommand: true,
        FuzzyFilter:           true,
        GoPromptOptions: []prompt.Option{
            prompt.WithPrefix("> "),
            prompt.WithLexer(lexer),
        },
    }
    cp.Run()
}

Try the example

go run ./_example