messing around with bubbletea

main.go

@@ -0,0 +1,102 @@
+package main
+
+import "fmt"
+import "os"
+import tea "github.com/charmbracelet/bubbletea"
+
+type model struct {
+	choices	[]string
+	cursor	int
+	selected map[int]struct{}
+}
+
+func initialModel() model {
+	return model{
+		choices: []string{"Tester 1", "Tester 2"},
+		selected: make(map[int]struct{}),
+	}
+}
+
+func (m model) Init() tea.Cmd {
+	return nil
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+    switch msg := msg.(type) {
+
+    // Is it a key press?
+    case tea.KeyMsg:
+
+        // Cool, what was the actual key pressed?
+        switch msg.String() {
+
+        // These keys should exit the program.
+        case "ctrl+c", "q":
+            return m, tea.Quit
+
+        // The "up" and "k" keys move the cursor up
+        case "up", "k":
+            if m.cursor > 0 {
+                m.cursor--
+            }
+
+        // The "down" and "j" keys move the cursor down
+        case "down", "j":
+            if m.cursor < len(m.choices)-1 {
+                m.cursor++
+            }
+
+        // The "enter" key and the spacebar (a literal space) toggle
+        // the selected state for the item that the cursor is pointing at.
+        case "enter", " ":
+            _, ok := m.selected[m.cursor]
+            if ok {
+                delete(m.selected, m.cursor)
+            } else {
+                m.selected[m.cursor] = struct{}{}
+            }
+        }
+    }
+
+    // Return the updated model to the Bubble Tea runtime for processing.
+    // Note that we're not returning a command.
+    return m, nil
+}
+
+func (m model) View() string {
+    // The header
+    s := "What should we buy at the market?\n\n"
+
+    // Iterate over our choices
+    for i, choice := range m.choices {
+
+        // Is the cursor pointing at this choice?
+        cursor := " " // no cursor
+        if m.cursor == i {
+            cursor = ">" // cursor!
+        }
+
+        // Is this choice selected?
+        checked := " " // not selected
+        if _, ok := m.selected[i]; ok {
+            checked = "x" // selected!
+        }
+
+        // Render the row
+        s += fmt.Sprintf("%s [%s] %s\n", cursor, checked, choice)
+    }
+
+    // The footer
+    s += "\nPress q to quit.\n"
+
+    // Send the UI for rendering
+    return s
+}
+
+func main() {
+    p := tea.NewProgram(initialModel())
+    if _, err := p.Run(); err != nil {
+        fmt.Printf("Alas, there's been an error: %v", err)
+        os.Exit(1)
+    }
+}