Multi-module monorepo - 10 independent libraries. Full metrics in CI.

Next-generation Terminal User Interface framework for Go

Status: ✅ v0.2.0 RELEASED 🚀 Organization: github.com/phoenix-tui Go Version: 1.25+ Test Coverage: 91.8% (Excellent across all modules) Performance: 29,000 FPS (489x faster than 60 FPS target) API Quality: 9/10 (Validated against Go 2025 best practices) Latest: Theme System, Form Components, TTY Control for external processes

Phoenix rises from the ashes of legacy TUI frameworks, solving critical problems:

• ✅ Perfect Unicode/Emoji support - No more layout bugs
• ✅ 10x Performance - Differential rendering, caching, zero allocations
• ✅ DDD Architecture - Clean, testable, extendable
• ✅ Rich Component Library - Everything you need out of the box
• ✅ Public Cursor API - Full control for shell applications
• ✅ Easy Migration from Charm - Comprehensive migration guide included

Phoenix is a modular framework with 8 independent libraries:

• phoenix/core ✅ - Terminal primitives, Unicode/Emoji support (CORRECT width calculation!)
• phoenix/style ✅ - CSS-like styling + Theme System (4 presets, runtime switching)
• phoenix/layout ✅ - Flexbox & grid layout (Box model, responsive sizing)
• phoenix/tea ✅ - Elm Architecture + TTY Control (run vim, shells, job control)
• phoenix/render ✅ - High-performance differential renderer (29,000 FPS!)
• phoenix/components ✅ - 10 UI components:
  • TextArea | TextInput | List | Viewport | Table | Modal | Progress
  • NEW in v0.2.0: Select, MultiSelect, Confirm, Form (with validation)
• phoenix/mouse ✅ - Mouse events (click, scroll, drag-drop, right-click support)
• phoenix/clipboard ✅ - Cross-platform clipboard (OSC 52 for SSH)

go get github.com/phoenix-tui/phoenix@latest

This installs the umbrella module with convenient access to all Phoenix libraries through a single import:

import "github.com/phoenix-tui/phoenix"

// Use convenience API
term := phoenix.AutoDetectTerminal()
style := phoenix.NewStyle().Foreground("#00FF00").Bold()
p := phoenix.NewProgram(myModel, phoenix.WithAltScreen[MyModel]())

go get github.com/phoenix-tui/phoenix/tea@latest        # Elm Architecture
go get github.com/phoenix-tui/phoenix/components@latest # UI Components
go get github.com/phoenix-tui/phoenix/style@latest      # Styling
go get github.com/phoenix-tui/phoenix/core@latest       # Terminal primitives

Individual imports give you more control and smaller dependencies:

import (
    tea "github.com/phoenix-tui/phoenix/tea/api"
    "github.com/phoenix-tui/phoenix/components/input/api"
)

go get github.com/phoenix-tui/phoenix@latest

package main

import (
    "fmt"
    "os"
    "github.com/phoenix-tui/phoenix"
    tea "github.com/phoenix-tui/phoenix/tea/api"
)

type Model struct {
    count int
}

func (m Model) Init() tea.Cmd { return nil }

func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
    switch msg := msg.(type) {
    case tea.KeyMsg:
        if msg.String() == "q" {
            return m, phoenix.Quit()
        }
        m.count++
    }
    return m, nil
}

func (m Model) View() string {
    // Use Phoenix convenience API for styling
    style := phoenix.NewStyle().Foreground("#00FF00").Bold()
    return style.Render(fmt.Sprintf("Count: %d\n", m.count))
}

func main() {
    p := phoenix.NewProgram(Model{}, phoenix.WithAltScreen[Model]())
    if err := p.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "Error: %v\n", err)
        os.Exit(1)
    }
}

go get github.com/phoenix-tui/phoenix/tea@latest

package main

import (
    "fmt"
    "os"
    "github.com/phoenix-tui/phoenix/tea/api"
)

type Model struct {
    count int
}

func (m Model) Init() api.Cmd { return nil }

func (m Model) Update(msg api.Msg) (Model, api.Cmd) {
    switch msg := msg.(type) {
    case api.KeyMsg:
        if msg.String() == "q" {
            return m, api.Quit()
        }
        m.count++
    }
    return m, nil
}

func (m Model) View() string {
    return fmt.Sprintf("Count: %d\nPress any key to increment, 'q' to quit\n", m.count)
}

func main() {
    p := api.New(Model{}, api.WithAltScreen[Model]())
    if err := p.Run(); err != nil {
        fmt.Fprintf(os.Stderr, "Error: %v\n", err)
        os.Exit(1)
    }
}

• MIGRATION_GUIDE.md - Migrate from Charm ecosystem (Bubbletea/Lipgloss/Bubbles)
• ROADMAP.md - Public roadmap (milestones, progress, dates)
• CHANGELOG.md - Version history and changes
• CONTRIBUTING.md - Development guide
• GoDoc - API reference for all modules

Phase 1: Foundation     ████████████████████  (10%)  ✅ Weeks 1-2
Phase 2: Core Libs      ████████████████████  (30%)  ✅ Weeks 3-8
Phase 3: Components     ████████████████████  (20%)  ✅ Weeks 9-12
Phase 4: Advanced       ████████████████████  (15%)  ✅ Weeks 13-16
Phase 5: Launch         ████████████████████  (25%)  ✅ Week 20 - API Polish
                        ══════════════════════
                        Progress: 100% (v0.1.0 STABLE!)

v0.1.0 STABLE RELEASED: API Quality 9/10, 91.8% coverage, 29,000 FPS, zero value docs complete

Week 3-4: phoenix/core

• Terminal primitives (ANSI, raw mode, capabilities)
• Unicode/Emoji width calculation (CORRECT - fixes Charm bug!)
• Grapheme cluster support (👋🏽 = 1 cluster, 2 cells)
• 98.4% test coverage

Week 5-6: phoenix/style

• CSS-like styling (bold, italic, colors)
• Border/padding/margin support
• 8-stage rendering pipeline
• Fluent builder API
• 90%+ test coverage

Week 7-8: phoenix/tea

• Elm Architecture (Model-Update-View)
• Type-safe event loop
• Command system (Quit, Batch, Sequence, Tick)
• Generic constraints (no interface{} casts!)
• 95.7% test coverage

Week 9-10: phoenix/layout

• Box model (padding, margin, border, sizing)
• Flexbox layout (row/column, gap, flex grow/shrink)
• Responsive sizing
• 97.9% test coverage (highest!)

Week 11-12: phoenix/components

• TextInput (90.0%) - Public cursor API, grapheme-aware, selection, validation
• List (94.7%) - Single/multi selection, filtering, custom rendering
• Viewport (94.5%) - Scrolling, follow mode, large content (10K+ lines)
• Table (92.0%) - Sortable columns, custom cell renderers, navigation
• Modal (96.5%) - Focus trap, buttons, dimming, keyboard shortcuts
• Progress (98.5%) - Bar + 15 spinner styles
• Average coverage: 94.5% (exceeds 90% target!)

Week 13-14: phoenix/render

• Differential rendering (virtual buffer)
• 29,000 FPS achieved (489x faster than 60 FPS target!)
• Zero allocations in hot paths
• 91.7% test coverage (improved from 87.1%)

Week 16: phoenix/mouse 🔥

• All buttons (Left, Right, Middle, WheelUp, WheelDown)
• Click detection (single/double/triple - automatic!)
• Drag & drop state tracking
• Multi-protocol (SGR, X10, URxvt)
• Comprehensive README (588 lines)
• 99.7% test coverage - 6,000+ lines test code
• 3 critical bugs found and fixed during coverage sprint!

Week 16: phoenix/clipboard

• Cross-platform (Windows/macOS/Linux)
• OSC 52 for SSH sessions (auto-detect)
• Native APIs (user32.dll, pbcopy/pbpaste, xclip/xsel)
• DDD architecture
• 82% average test coverage (domain 100%)

Problem: Charm's Lipgloss has broken emoji width calculation (issue #562) Solution: Phoenix uses grapheme cluster detection with correct East Asian Width (UAX #11)

// Phoenix: CORRECT
text := "Hello 👋 World 🌍"
width := style.Width(text)  // Returns 17 (correct!)

// Charm Lipgloss: BROKEN
width := lipgloss.Width(text)  // Returns 19 (wrong!)

Benchmark: 29,000 FPS (489x faster than 60 FPS target) Techniques: Differential rendering, caching, zero allocations

library/
├── domain/        # Business logic (95%+ coverage)
├── application/   # Use cases
├── infrastructure/ # Technical details
└── api/           # Public interface

Problem: Bubbles TextArea has private cursor - syntax highlighting impossible Solution: Phoenix TextInput exposes CursorPosition() and ContentParts()

// Phoenix: PUBLIC API (syntax highlighting works!)
before, at, after := input.ContentParts()
highlighted := syntax.Highlight(before) +
               cursor.Render(at) +
               syntax.Highlight(after)

// Bubbles: PRIVATE (syntax highlighting impossible!)
// cursor is internal field - no access

Mouse: All buttons (Left, Right, Middle, Wheel), drag-drop, click detection Clipboard: Cross-platform (Windows/macOS/Linux), SSH support (OSC 52)

Available: Progress Bar + 15 Spinner Styles (Week 11-12, 98.5% coverage) Location: github.com/phoenix-tui/phoenix/components/progress/api

Phoenix includes a comprehensive Progress component with both bars and animated spinners:

import progress "github.com/phoenix-tui/phoenix/components/progress/api"

// Progress Bar
bar := progress.NewBar(100).  // Max value 100
    SetWidth(40).
    SetLabel("Downloading").
    SetValue(65)  // Current progress 65%

// Animated Spinner (15 styles available!)
spinner := progress.NewSpinner(progress.SpinnerDots).
    SetLabel("Loading").
    SetFPS(10)

// Example styles: SpinnerDots, SpinnerLine, SpinnerArrow, SpinnerCircle,
// SpinnerBounce, SpinnerPulse, SpinnerGrowHorizontal, SpinnerGrowVertical, etc.

Features:

• Progress bars with customizable width and characters
• 15 pre-built spinner styles (dots, lines, arrows, circles, bouncing, etc.)
• Label support for both bars and spinners
• Configurable FPS for smooth animations
• 98.5% test coverage

Examples: See examples/progress/ for working demonstrations:

• bar_simple.go - Basic progress bar
• bar_styled.go - Styled progress bar with colors
• spinner_simple.go - Animated spinner
• multi_progress.go - Multiple progress indicators

Documentation: See components/progress/README.md for full API reference

TTY Control System (Level 1, 1+, 2):

• Run external processes like vim, nano, shells with full terminal control
• Suspend/Resume Phoenix TUI while external process runs
• Job control support (foreground/background process groups)
• Platform support: Linux, macOS, Windows

Form Components:

• Select - Single-choice dropdown with keyboard navigation
• MultiSelect - Multiple-choice selection with checkboxes
• Confirm - Yes/No prompts with customizable buttons
• Form - Complete form system with validation

Theme System:

• 4 built-in presets: Default, Dark, Light, HighContrast
• Runtime theme switching
• All 10 components support Theme API
• Custom theme creation

See CHANGELOG.md for full v0.2.0 details

v0.3.0 (Future):

• Signals integration (reactive views - optional, hybrid approach)
• Animation framework
• Grid layout enhancements

Phoenix is part of an active development effort. See CONTRIBUTING.md for contribution guidelines and GoDoc for API documentation.

MIT License - see LICENSE file for details

Professor Ancha Baranova - This project would not have been possible without her invaluable help and support. Her assistance was crucial in bringing Phoenix to life.

Rising from the ashes of legacy TUI frameworks 🔥 v0.2.0 STABLE ⭐ API Quality: 9/10 | 91.8% coverage | 29,000 FPS | Theme System + Form Components + TTY Control!