108 lines
2.4 KiB
Go
108 lines
2.4 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
|
|
tea "github.com/charmbracelet/bubbletea"
|
|
)
|
|
|
|
type shoppingModel struct {
|
|
choices []string // items on the shopping list
|
|
cursor int // which shopping list item our cursor is pointing at
|
|
selected map[int]struct{} // which shopping items are selected
|
|
}
|
|
|
|
func initialModel() shoppingModel {
|
|
return shoppingModel{
|
|
// Our shopping list is a grocery list
|
|
choices: []string{"Buy Carrots", "Buy Celery", "Buy Kohlrabi"},
|
|
|
|
// A map which indicates which choices are selected. We're using
|
|
// the map like a mathematical set. The keys refer to the indexes
|
|
// of the `choices` slice, above.
|
|
selected: make(map[int]struct{}),
|
|
}
|
|
}
|
|
|
|
func (m shoppingModel) Init() tea.Cmd {
|
|
// Just return `nil`, which means "no I/O right now, please."
|
|
return nil
|
|
}
|
|
|
|
func (m shoppingModel) 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() {
|
|
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 space bar (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 shoppingModel to the Bubble Tea runtime for processing.
|
|
// Note that we're not returning a command.
|
|
return m, nil
|
|
}
|
|
|
|
func (m shoppingModel) 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 shopping() {
|
|
p := tea.NewProgram(initialModel())
|
|
if _, err := p.Run(); err != nil {
|
|
fmt.Printf("Alas, there's been an error: %v", err)
|
|
os.Exit(1)
|
|
}
|
|
}
|