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Building CLIs

Master plan for creating professional command-line interfaces with excellent user experience. This skill covers CLI design patterns, argument parsing, interactive prompts, output formatting, and distribution strategies for building tools that developers love to use.

Status​

Master Plan Available

Key Topics​

  • CLI Architecture

    • Command structure and subcommand patterns
    • Argument and option parsing
    • Configuration file management (JSON, YAML, TOML)
    • Environment variable handling
    • Plugin and extension systems

  • User Experience

    • Interactive prompts and wizards
    • Progress indicators and spinners
    • Colorized output and formatting
    • Error messages and help text
    • Tab completion and shell integration

  • Input/Output Handling

    • STDIN/STDOUT/STDERR usage
    • Pipe and redirection support
    • Output formats (JSON, YAML, table, plain text)
    • Verbose and quiet modes
    • Log levels and debugging output

  • Testing & Quality

    • Unit testing CLI commands
    • Integration testing with subprocess
    • Snapshot testing for output
    • Cross-platform compatibility
    • Error handling and exit codes

  • Distribution & Updates

    • Package managers (npm, pip, cargo, homebrew)
    • Binary compilation and distribution
    • Auto-update mechanisms
    • Version checking and migration

Primary Tools & Technologies​

  • Node.js: Commander.js, Yargs, Inquirer, Chalk, Ora
  • Python: Click, Typer, argparse, Rich, Typer
  • Go: Cobra, Viper, urfave/cli
  • Rust: Clap, structopt
  • Testing: Jest, pytest, Go testing, Rust testing frameworks

Integration Points​

  • API Design Principles: CLIs consume APIs
  • SDK Design: CLIs can wrap SDK functionality
  • Git Workflows: Git is a CLI tool pattern to emulate
  • Documentation Generation: Generate CLI help from code
  • Debugging Techniques: CLI debugging strategies
  • Shell scripting and automation
  • DevOps and deployment tools
  • Terminal UI/TUI development
  • Package management
  • Cross-platform development

Implementation Approach​

The skill will provide:

  • CLI project templates for multiple languages
  • Command structure design patterns
  • Interactive prompt examples
  • Output formatting utilities
  • Testing strategy templates
  • Distribution checklists