this is cool

cmd/goedit/main.go

@@ -1,7 +1,177 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type Model struct {
+	lines  []string
+	row    int
+	col    int
+	width  int
+	height int
+}
+
+func NewModel() Model {
+	return Model{
+		lines:  []string{""},
+		row:    0,
+		col:    0,
+		width:  80,
+		height: 24,
+	}
+}
+
+func (m Model) Init() tea.Cmd {
+	return nil
+}
+
+func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.width = msg.Width
+		m.height = msg.Height
+		return m, nil
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c", "esc":
+			return m, tea.Quit
+
+		case "up":
+			if m.row > 0 {
+				m.row--
+				if m.col > len(m.lines[m.row]) {
+					m.col = len(m.lines[m.row])
+				}
+			}
+
+		case "down":
+			if m.row < len(m.lines)-1 {
+				m.row++
+				if m.col > len(m.lines[m.row]) {
+					m.col = len(m.lines[m.row])
+				}
+			}
+
+		case "left":
+			if m.col > 0 {
+				m.col--
+			} else if m.row > 0 {
+				m.row--
+				m.col = len(m.lines[m.row])
+			}
+
+		case "right":
+			if m.col < len(m.lines[m.row]) {
+				m.col++
+			} else if m.row < len(m.lines)-1 {
+				m.row++
+				m.col = 0
+			}
+
+		case "home":
+			m.col = 0
+
+		case "end":
+			m.col = len(m.lines[m.row])
+
+		case "enter":
+			line := m.lines[m.row]
+			before := line[:m.col]
+			after := line[m.col:]
+
+			m.lines[m.row] = before
+			newLine := after
+
+			newLines := make([]string, len(m.lines)+1)
+			copy(newLines[:m.row+1], m.lines[:m.row+1])
+			newLines[m.row+1] = newLine
+			copy(newLines[m.row+2:], m.lines[m.row+1:])
+
+			m.lines = newLines
+			m.row++
+			m.col = 0
+
+		case "backspace":
+			if m.col > 0 {
+				line := m.lines[m.row]
+				m.lines[m.row] = line[:m.col-1] + line[m.col:]
+				m.col--
+			} else if m.row > 0 {
+				prevLine := m.lines[m.row-1]
+				currentLine := m.lines[m.row]
+				m.lines[m.row-1] = prevLine + currentLine
+
+				newLines := make([]string, len(m.lines)-1)
+				copy(newLines[:m.row], m.lines[:m.row])
+				copy(newLines[m.row:], m.lines[m.row+1:])
+
+				m.lines = newLines
+				m.row--
+				m.col = len(prevLine)
+			}
+
+		case "delete":
+			line := m.lines[m.row]
+			if m.col < len(line) {
+				m.lines[m.row] = line[:m.col] + line[m.col+1:]
+			} else if m.row < len(m.lines)-1 {
+				nextLine := m.lines[m.row+1]
+				m.lines[m.row] = line + nextLine
+
+				newLines := make([]string, len(m.lines)-1)
+				copy(newLines[:m.row+1], m.lines[:m.row+1])
+				copy(newLines[m.row+1:], m.lines[m.row+2:])
+
+				m.lines = newLines
+			}
+
+		default:
+			if len(msg.String()) == 1 && msg.String() >= " " {
+				char := msg.String()
+				line := m.lines[m.row]
+				m.lines[m.row] = line[:m.col] + char + line[m.col:]
+				m.col++
+			}
+		}
+	}
+
+	return m, nil
+}
+
+func (m Model) View() string {
+	var b strings.Builder
+
+	b.WriteString("Text Editor (Ctrl+C or Esc to quit)\n\n")
+
+	for i, line := range m.lines {
+		if i == m.row {
+			if m.col == 0 {
+				b.WriteString("█" + line + "\n")
+			} else if m.col >= len(line) {
+				b.WriteString(line + "█\n")
+			} else {
+				b.WriteString(line[:m.col] + "█" + line[m.col:] + "\n")
+			}
+		} else {
+			b.WriteString(line + "\n")
+		}
+	}
+
+	b.WriteString(fmt.Sprintf("\nRow: %d, Col: %d", m.row+1, m.col+1))
+
+	return b.String()
+}
 
 func main() {
-	fmt.Println("Hello, World!")
+	p := tea.NewProgram(NewModel(), tea.WithAltScreen())
+	if _, err := p.Run(); err != nil {
+		fmt.Printf("Error: %v", err)
+		os.Exit(1)
+	}
 }

go.mod

@@ -1,3 +1,27 @@
 module git.keircn.com/keiran/goedit
 
 go 1.24.5
+
+require github.com/charmbracelet/bubbletea v1.3.6
+
+require (
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
+	github.com/charmbracelet/lipgloss v1.1.0 // indirect
+	github.com/charmbracelet/x/ansi v0.9.3 // indirect
+	github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
+	github.com/charmbracelet/x/term v0.2.1 // indirect
+	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-localereader v0.0.1 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
+	github.com/muesli/cancelreader v0.2.2 // indirect
+	github.com/muesli/termenv v0.16.0 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	golang.org/x/sync v0.15.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.3.8 // indirect
+)

go.sum

@@ -0,0 +1,45 @@
+github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/charmbracelet/bubbletea v1.3.6 h1:VkHIxPJQeDt0aFJIsVxw8BQdh/F/L2KKZGsK6et5taU=
+github.com/charmbracelet/bubbletea v1.3.6/go.mod h1:oQD9VCRQFF8KplacJLo28/jofOI2ToOfGYeFgBBxHOc=
+github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
+github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
+github.com/charmbracelet/lipgloss v1.1.0 h1:vYXsiLHVkK7fp74RkV7b2kq9+zDLoEU4MZoFqR/noCY=
+github.com/charmbracelet/lipgloss v1.1.0/go.mod h1:/6Q8FR2o+kj8rz4Dq0zQc3vYf7X+B0binUUBwA0aL30=
+github.com/charmbracelet/x/ansi v0.9.3 h1:BXt5DHS/MKF+LjuK4huWrC6NCvHtexww7dMayh6GXd0=
+github.com/charmbracelet/x/ansi v0.9.3/go.mod h1:3RQDQ6lDnROptfpWuUVIUG64bD2g2BgntdxH0Ya5TeE=
+github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd h1:vy0GVL4jeHEwG5YOXDmi86oYw2yuYUGqz6a8sLwg0X8=
+github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
+github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
+github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
+github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
+github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-localereader v0.0.1 h1:ygSAOl7ZXTx4RdPYinUpg6W99U8jWvWi9Ye2JC/oIi4=
+github.com/mattn/go-localereader v0.0.1/go.mod h1:8fBrzywKY7BI3czFoHkuzRoWE9C+EiG4R1k4Cjx5p88=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
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