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|
// Package choose provides an interface to choose one option from a given list
// of options. The options can be provided as (new-line separated) stdin or a
// list of arguments.
//
// It is different from the filter command as it does not provide a fuzzy
// finding input, so it is best used for smaller lists of options.
//
// Let's pick from a list of gum flavors:
//
// $ gum choose "Strawberry" "Banana" "Cherry"
package choose
import (
"strings"
"github.com/charmbracelet/bubbles/paginator"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/mattn/go-runewidth"
)
type model struct {
height int
cursor string
selectedPrefix string
unselectedPrefix string
cursorPrefix string
items []item
quitting bool
index int
limit int
numSelected int
paginator paginator.Model
aborted bool
// styles
cursorStyle lipgloss.Style
itemStyle lipgloss.Style
selectedItemStyle lipgloss.Style
}
type item struct {
text string
selected bool
}
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:
return m, nil
case tea.KeyMsg:
start, end := m.paginator.GetSliceBounds(len(m.items))
switch keypress := msg.String(); keypress {
case "down", "j", "ctrl+n":
m.index = clamp(m.index+1, 0, len(m.items)-1)
if m.index >= end {
m.paginator.NextPage()
}
case "up", "k", "ctrl+p":
m.index = clamp(m.index-1, 0, len(m.items)-1)
if m.index < start {
m.paginator.PrevPage()
}
case "right", "l", "ctrl+f":
m.index = clamp(m.index+m.height, 0, len(m.items)-1)
m.paginator.NextPage()
case "left", "h", "ctrl+b":
m.index = clamp(m.index-m.height, 0, len(m.items)-1)
m.paginator.PrevPage()
case "a":
if m.limit <= 1 {
break
}
for i := range m.items {
m.items[i].selected = true
}
m.numSelected = len(m.items)
case "A":
if m.limit <= 1 {
break
}
for i := range m.items {
m.items[i].selected = false
}
m.numSelected = 0
case "ctrl+c", "esc":
m.aborted = true
m.quitting = true
return m, tea.Quit
case " ", "x":
if m.limit == 1 {
break // no op
}
if m.items[m.index].selected {
m.items[m.index].selected = false
m.numSelected--
} else if m.numSelected < m.limit {
m.items[m.index].selected = true
m.numSelected++
}
case "enter":
m.quitting = true
// If the user hasn't selected any items in a multi-select.
// Then we select the item that they have pressed enter on. If they
// have selected items, then we simply return them.
if m.numSelected < 1 {
m.items[m.index].selected = true
}
return m, tea.Quit
}
}
var cmd tea.Cmd
m.paginator, cmd = m.paginator.Update(msg)
return m, cmd
}
func (m model) View() string {
if m.quitting {
return ""
}
var s strings.Builder
start, end := m.paginator.GetSliceBounds(len(m.items))
for i, item := range m.items[start:end] {
if i == m.index%m.height {
s.WriteString(m.cursorStyle.Render(m.cursor))
} else {
s.WriteString(strings.Repeat(" ", runewidth.StringWidth(m.cursor)))
}
if item.selected {
s.WriteString(m.selectedItemStyle.Render(m.selectedPrefix + item.text))
} else if i == m.index%m.height {
s.WriteString(m.cursorStyle.Render(m.cursorPrefix + item.text))
} else {
s.WriteString(m.itemStyle.Render(m.unselectedPrefix + item.text))
}
if i != m.height {
s.WriteRune('\n')
}
}
if m.paginator.TotalPages <= 1 {
return s.String()
}
s.WriteString(strings.Repeat("\n", m.height-m.paginator.ItemsOnPage(len(m.items))+1))
s.WriteString(" " + m.paginator.View())
return s.String()
}
//nolint:unparam
func clamp(x, min, max int) int {
if x < min {
return min
}
if x > max {
return max
}
return x
}
|
