Add input module from github.com/charmbracelet/tea

go.mod

@@ -0,0 +1,5 @@
+module github.com/charmbracelet/teaparty
+
+go 1.13
+
+require github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94 // indirect

go.sum

@@ -0,0 +1,4 @@
+github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94 h1:m2xhUqOw6OcefbPBR9Il0J0n0gB1663NoKU+vvkiLdU=
+github.com/charmbracelet/tea v0.0.0-20200118154546-df52853f9d94/go.mod h1:lijy1lXOKNwMjBu/jTT/DvR8yE9PhtX2olGFsCz9/Vk=
+github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942 h1:A7GG7zcGjl3jqAqGPmcNjd/D9hzL95SuoOQAaFNdLU0=
+github.com/pkg/term v0.0.0-20190109203006-aa71e9d9e942/go.mod h1:eCbImbZ95eXtAUIbLAuAVnBnwf83mjf6QIVH8SHYwqQ=

input/input.go

@@ -0,0 +1,96 @@
+package input
+
+import (
+	"time"
+
+	"github.com/charmbracelet/tea"
+)
+
+type Model struct {
+	Prompt       string
+	Value        string
+	Cursor       string
+	HiddenCursor string
+	BlinkSpeed   time.Duration
+
+	blink bool
+	pos   int
+}
+
+type CursorBlinkMsg struct{}
+
+func DefaultModel() Model {
+	return Model{
+		Prompt:     "> ",
+		Value:      "",
+		BlinkSpeed: time.Millisecond * 600,
+
+		blink: false,
+		pos:   0,
+	}
+}
+
+func Update(msg tea.Msg, m Model) (Model, tea.Cmd) {
+	switch msg := msg.(type) {
+
+	case tea.KeyMsg:
+		switch msg.Type {
+		case tea.KeyBackspace:
+			if len(m.Value) > 0 {
+				m.Value = m.Value[:m.pos-1] + m.Value[m.pos:]
+				m.pos--
+			}
+			return m, nil
+		case tea.KeyLeft:
+			if m.pos > 0 {
+				m.pos--
+			}
+			return m, nil
+		case tea.KeyRight:
+			if m.pos < len(m.Value) {
+				m.pos++
+			}
+			return m, nil
+		case tea.KeyRune:
+			m.Value = m.Value[:m.pos] + msg.String() + m.Value[m.pos:]
+			m.pos++
+			return m, nil
+		default:
+			return m, nil
+		}
+
+	case CursorBlinkMsg:
+		m.blink = !m.blink
+		return m, nil
+
+	default:
+		return m, nil
+	}
+}
+
+func View(model tea.Model) string {
+	m, _ := model.(Model)
+	v := m.Value[:m.pos]
+	if m.pos < len(m.Value) {
+		v += cursor(string(m.Value[m.pos]), m.blink)
+		v += m.Value[m.pos+1:]
+	} else {
+		v += cursor(" ", m.blink)
+	}
+	return m.Prompt + v
+}
+
+// Style the cursor
+func cursor(s string, blink bool) string {
+	if blink {
+		return s
+	}
+	return tea.Invert(s)
+}
+
+// Subscription
+func Blink(model tea.Model) tea.Msg {
+	m, _ := model.(Model)
+	time.Sleep(m.BlinkSpeed)
+	return CursorBlinkMsg{}
+}

teaparty.go

@@ -0,0 +1 @@
+package teaparty