How does Linenoise-Swift compare to GNU readline for Swift projects?

Linenoise-Swift is a pure Swift library with no external dependencies, making it easier to integrate via Swift Package Manager, but it offers fewer advanced features than GNU readline, which is more comprehensive but requires C interop. Choose Linenoise-Swift for simplicity and modern Swift APIs, or GNU readline for full-featured line-editing with potential complexity.

How to add custom tab-completion in Linenoise-Swift?

Implement the setCompletionCallback method to return an array of strings filtered by the current buffer, as shown in the README's completion example. The callback receives the typed text, and you can cycle through suggestions with repeated tab presses.

Does Linenoise-Swift work on Windows?

No, Linenoise-Swift only supports macOS and Linux, as stated in the README. For Windows compatibility, you would need to use alternative libraries or rely on cross-platform terminal solutions.

Can I use Linenoise-Swift in a Swift REPL?

Yes, Linenoise-Swift is ideal for building REPLs or interactive CLI tools in Swift, thanks to its line-editing, history, and completion features. It provides a drop-in replacement for Swift.readLine with enhanced capabilities.

How to save command history to a file in Linenoise-Swift?

Use the saveHistory(toFile:) method to persist history to a specified file path, and loadHistory(fromFile:) to restore it, as detailed in the History section. This allows for persistent command history across sessions.

Is Linenoise-Swift thread-safe?

The README does not mention thread-safety, so it's likely not designed for concurrent use from multiple threads. For thread-safe applications, you should handle synchronization externally or use it in a single-threaded context.

Open-Awesome

Linenoise

BSD-2-ClauseSwift

A pure Swift implementation of Linenoise, providing a minimal, zero-config readline replacement for command-line applications.

GitHub

155 stars14 forks0 contributors

What is Linenoise?

Linenoise-Swift is a pure Swift library that implements the Linenoise functionality, serving as a minimal and dependency-free replacement for readline in command-line applications. It solves the problem of adding advanced line-editing, history, and completion features to terminal-based Swift tools without relying on external C libraries or complex configurations.

Target Audience

Swift developers building command-line tools, REPLs, or interactive terminal applications that require robust user input handling.

Value Proposition

Developers choose Linenoise-Swift for its pure Swift implementation, which eliminates external dependencies and simplifies integration via Swift Package Manager, while providing a modern, Swifty API that mirrors the capabilities of the original Linenoise library.

Overview

A pure Swift replacement for readline

Use Cases

Best For

Building Swift-based command-line tools with interactive prompts
Creating REPLs (Read-Eval-Print Loops) in Swift
Adding line-editing with emacs keybindings to terminal apps
Implementing tab-completion for custom command sets
Developing CLI applications that require persistent command history
Providing contextual hints for user input in terminal interfaces

Not Ideal For

Swift projects targeting Windows or other non-Unix platforms, as Linenoise-Swift only supports macOS and Linux.
Applications requiring vi-mode keybindings or extensive keybinding customization beyond emacs-style.
Teams needing advanced readline features like multi-line editing or syntax highlighting, which are beyond Linenoise's minimalist scope.
Developers building GUI or server-side Swift applications where terminal line-editing is irrelevant.

Pros & Cons

Pros

Pure Swift Implementation

Built entirely in Swift with no external dependencies, ensuring seamless integration via Swift Package Manager, as emphasized in the README.

Modern Swifty API

Provides a simple, zero-configuration API that mirrors Swift conventions, making it easy to replace standard readline, as shown in the quick start example.

Comprehensive Line-Editing

Supports essential features like emacs keybindings, history handling, tab-completion, and hints, all detailed in the API section with examples.

Configurable History Management

Allows setting history limits, file persistence, and edit preservation, offering flexible history control as explained in the History section.

Cons

Limited Keybinding Support

Only includes emacs-style keybindings; developers needing vi-mode or custom schemes must look elsewhere, which can be restrictive for diverse user preferences.

Platform Restrictions

Explicitly supports only macOS and Linux, excluding Windows and other platforms, which hinders cross-platform Swift projects.

Minimalist Feature Set

As a port of the minimalist Linenoise library, it lacks advanced readline capabilities like multi-line editing or extensive customization found in GNU readline.

Frequently Asked Questions

Related Projects

Swift Argument Parser

Straightforward, type-safe argument parsing for Swift

Stars3,717

Forks382

Last commit4 days ago

Commander

Compose beautiful command line interfaces in Swift

Stars1,535

Forks85

Last commit4 years ago

SwiftShell

A Swift framework for shell scripting.

Stars1,057

Forks86

Last commit2 months ago

SwiftCLI

A powerful framework for developing CLIs in Swift

Stars880

Forks72