Clir or Cobra: which is better for a Go CLI project?

Clir is ideal for simple, dependency-free tools with a clean API, while Cobra offers more features like Viper integration and a larger ecosystem. Choose Clir for minimalism and Cobra for comprehensive functionality out of the box.

How to add custom validation to flags in Clir?

Clir doesn't have built-in validation; you need to implement it in the action function. After flag parsing, check values and return errors if validation fails, as shown in the example error handling.

Does Clir support environment variables?

No, Clir focuses on command-line flags and positional arguments. For environment variables, you'll need to handle them separately using Go's os package or similar standard library tools.

Can I use Clir for multi-command tools with shared flags?

Yes, Clir supports nested subcommands, allowing you to create parent commands with shared flags that propagate to child commands, enabling reusable configurations across commands.

Is Clir suitable for large-scale CLI applications?

Clir can handle large applications with nested subcommands, but its simplicity might require more boilerplate code for complex logic, such as validation or advanced help formatting, compared to libraries with more built-in features.

How does Clir handle positional arguments in commands?

Clir supports positional arguments through its API, allowing you to define them alongside flags in the command structure, similar to how the standard library flag package works but with enhanced syntax.

Open-Awesome

clîr

MITGov1.7.0

A simple, clear, and dependency-free CLI library for Go with struct-based flags and nested subcommands.

GitHub

201 stars18 forks0 contributors

What is clîr?

Clir is a Go library for building command-line interface applications with a focus on simplicity and clarity. It provides an intuitive API for creating CLI tools with features like nested subcommands, struct-based flags, and automatic help generation while maintaining zero external dependencies.

Target Audience

Go developers who need to build command-line tools and want a simple, dependency-free library with modern CLI features.

Value Proposition

Developers choose Clir for its clean API, dependency-free design, and balance of simplicity with essential features like struct-based flags and nested subcommands that many minimal CLI libraries lack.

Overview

A Simple and Clear CLI library. Dependency free.

Use Cases

Best For

Building simple CLI tools in Go without external dependencies
Creating command-line applications with nested subcommand hierarchies
Developing Go CLI tools that need struct-based flag parsing
Building terminal applications that require custom banners or branding
Creating CLI tools with hidden/internal commands
Developing Go applications that need automatic help generation

Not Ideal For

Projects requiring built-in shell autocompletion (bash, zsh, fish) or colored output
Teams needing extensive integration with configuration files or environment variable parsing beyond basic flags
Applications where complex, interactive CLI features like progress bars or real-time updates are essential

Pros & Cons

Pros

Dependency-Free Design

Uses only Go's standard library, eliminating external dependencies and reducing project bloat, as emphasized in the README.

Struct-Based Flags

Enables type-safe configuration by defining flags in Go structs, demonstrated in the example code for cleaner and more maintainable setups.

Nested Subcommands

Supports creating complex command hierarchies with parent-child relationships, allowing for advanced CLI structures without external libraries.

Auto-Generated Help

Automatically generates help text for commands and flags, reducing manual documentation effort and ensuring consistency.

Cons

Limited Advanced Features

Lacks built-in support for common CLI enhancements like colored output, interactive prompts, or shell completion, which are available in heavier libraries.

Minimal Ecosystem

Being dependency-free means fewer community plugins or extensions, so you may need to implement custom features like validation or logging from scratch.

Simplistic for Complex Cases

For very complex CLI applications with advanced parsing or validation needs, the simplicity might require more manual coding compared to feature-rich alternatives.

Frequently Asked Questions

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