Carapace

Carapace is a multi-shell completion binary that provides intelligent command completion across different shell environments. It works with bash, fish, zsh, PowerShell, nushell, and several other shells, allowing developers to get consistent completion behavior regardless of which shell they use. The tool processes completions quickly, caching results and supporting batch operations to minimize delays when completing commands. Carapace enables grouping of completion suggestions by tags and supports customizable highlighting styles for visual feedback.

The tool can be extended through plugins and custom specifications, allowing developers to tailor completion behavior for their own commands and workflows. It supports complex scenarios including multi-part completion and the ability to embed completion definitions directly in code. Carapace is developed by carapace-sh and released under the MIT license. The project is written in Go.