cli-skills

Development

CLI best practices for LlamaFarm. Covers Cobra, Bubbletea, Lipgloss patterns for Go CLI development.

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CLI Skills for LlamaFarm

Framework-specific patterns for the LlamaFarm CLI. These guidelines extend the shared Go skills with Cobra, Bubbletea, and Lipgloss best practices.

Tech Stack

Go 1.24+
Cobra (CLI framework)
Bubbletea (TUI framework)
Lipgloss (terminal styling)
Bubbles (TUI components)

Directory Structure

cli/
  cmd/             # Cobra command implementations
    config/        # Configuration types and loading
    orchestrator/  # Service management and process control
    utils/         # Shared utilities (HTTP, output, logging)
    version/       # Version and upgrade handling
  internal/        # Internal packages (not exported)
    tui/           # Reusable TUI components
    buildinfo/     # Build-time information

Quick Reference

Cobra Commands

Use RunE over Run for error handling
Register flags in init() functions
Use persistent flags for shared options
Validate arguments with Args field

Bubbletea TUI

Implement Init(), Update(), View() interface
Use message types for state changes
Return tea.Cmd for async operations
Keep state immutable in Update()

Lipgloss Styling

Define styles as package-level constants
Use lipgloss.NewStyle() for styling
Handle terminal width dynamically
Support color themes via style variables

Shared Go Skills

This skill extends the base Go skills. See:

Link	Description
go-skills/SKILL.md	Overview and quick reference
go-skills/patterns.md	Idiomatic Go patterns
go-skills/concurrency.md	Goroutines, channels, sync
go-skills/error-handling.md	Error wrapping, sentinels
go-skills/testing.md	Table-driven tests, mocks
go-skills/security.md	Input validation, secure coding

CLI-Specific Checklists

File	Description
cobra.md	Cobra command patterns, flags, validation
bubbletea.md	Bubbletea Model/Update/View patterns
performance.md	CLI-specific optimizations

Key Patterns in This Codebase

Command Registration Pattern

var myCmd = &cobra.Command{
    Use:   "mycommand [args]",
    Short: "Brief description",
    Long:  `Extended description with examples.`,
    Args:  cobra.MaximumNArgs(1),
    RunE: func(cmd *cobra.Command, args []string) error {
        // Implementation with error returns
        return nil
    },
}

func init() {
    rootCmd.AddCommand(myCmd)
    myCmd.Flags().StringVar(&flagVar, "flag", "default", "Flag description")
}

TUI Model Pattern

type myModel struct {
    viewport viewport.Model
    textarea textarea.Model
    width    int
    height   int
    err      error
}

func (m myModel) Init() tea.Cmd {
    return tea.Batch(m.textarea.Focus(), doAsyncWork())
}

func (m myModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
    var cmds []tea.Cmd
    switch msg := msg.(type) {
    case tea.WindowSizeMsg:
        m.width = msg.Width
        m.height = msg.Height
    case tea.KeyMsg:
        switch msg.String() {
        case "ctrl+c":
            return m, tea.Quit
        }
    }
    return m, tea.Batch(cmds...)
}

func (m myModel) View() string {
    return lipgloss.JoinVertical(lipgloss.Left,
        m.viewport.View(),
        m.textarea.View(),
    )
}

Output API Pattern

// Use the output API for consistent messaging
utils.OutputInfo("Starting service %s...", serviceName)
utils.OutputSuccess("Service started successfully")
utils.OutputError("Failed to start service: %v", err)
utils.OutputProgress("Downloading model...")
utils.OutputWarning("Service already running")

Service Orchestration Pattern

// Ensure services are running before operations
factory := GetServiceConfigFactory()
config := factory.ServerOnly(serverURL)
orchestrator.EnsureServicesOrExitWithConfig(config, "server")

// Or with multiple services
config := factory.RAGCommand(serverURL)
orchestrator.EnsureServicesOrExitWithConfig(config, "server", "rag", "universal-runtime")

Guidelines

User Experience First: CLI should feel responsive and provide clear feedback
Graceful Degradation: Handle missing services, network errors, and timeouts gracefully
Consistent Output: Use the output API for all user-facing messages
Cross-Platform: Test on macOS, Linux, and Windows
Terminal Compatibility: Test with different terminal emulators and sizes