mirror of
https://github.com/charmbracelet/gum.git
synced 2024-10-26 15:20:05 +03:00
164 lines
3.8 KiB
Go
164 lines
3.8 KiB
Go
// Package choose provides an interface to choose one option from a given list
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// of options. The options can be provided as (new-line separated) stdin or a
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// list of arguments.
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//
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// It is different from the filter command as it does not provide a fuzzy
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// finding input, so it is best used for smaller lists of options.
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//
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// Let's pick from a list of gum flavors:
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//
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// $ gum choose "Strawberry" "Banana" "Cherry"
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//
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package choose
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import (
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"strings"
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"github.com/charmbracelet/bubbles/paginator"
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tea "github.com/charmbracelet/bubbletea"
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"github.com/charmbracelet/lipgloss"
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"github.com/mattn/go-runewidth"
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)
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type model struct {
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height int
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cursor string
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selectedPrefix string
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unselectedPrefix string
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cursorPrefix string
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items []item
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quitting bool
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index int
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limit int
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numSelected int
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paginator paginator.Model
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aborted bool
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// styles
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cursorStyle lipgloss.Style
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itemStyle lipgloss.Style
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selectedItemStyle lipgloss.Style
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}
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type item struct {
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text string
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selected bool
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}
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func (m model) Init() tea.Cmd { return nil }
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func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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switch msg := msg.(type) {
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case tea.WindowSizeMsg:
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return m, nil
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case tea.KeyMsg:
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start, end := m.paginator.GetSliceBounds(len(m.items))
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switch keypress := msg.String(); keypress {
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case "down", "j", "ctrl+n":
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m.index = clamp(m.index+1, 0, len(m.items)-1)
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if m.index >= end {
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m.paginator.NextPage()
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}
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case "up", "k", "ctrl+p":
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m.index = clamp(m.index-1, 0, len(m.items)-1)
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if m.index < start {
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m.paginator.PrevPage()
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}
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case "right", "l", "ctrl+f":
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m.index = clamp(m.index+m.height, 0, len(m.items)-1)
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m.paginator.NextPage()
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case "left", "h", "ctrl+b":
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m.index = clamp(m.index-m.height, 0, len(m.items)-1)
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m.paginator.PrevPage()
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case "a":
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for i := range m.items {
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m.items[i].selected = true
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}
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m.numSelected = len(m.items)
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case "A":
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for i := range m.items {
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m.items[i].selected = false
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}
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m.numSelected = 0
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case "ctrl+c":
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m.aborted = true
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m.quitting = true
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return m, tea.Quit
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case " ", "x":
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if m.limit == 1 {
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break // no op
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}
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if m.items[m.index].selected {
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m.items[m.index].selected = false
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m.numSelected--
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} else if m.numSelected < m.limit {
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m.items[m.index].selected = true
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m.numSelected++
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}
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case "enter":
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m.quitting = true
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// If the user hasn't selected any items in a multi-select.
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// Then we select the item that they have pressed enter on. If they
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// have selected items, then we simply return them.
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if m.numSelected < 1 {
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m.items[m.index].selected = true
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}
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return m, tea.Quit
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}
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}
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var cmd tea.Cmd
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m.paginator, cmd = m.paginator.Update(msg)
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return m, cmd
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}
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func (m model) View() string {
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if m.quitting {
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return ""
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}
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var s strings.Builder
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start, end := m.paginator.GetSliceBounds(len(m.items))
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for i, item := range m.items[start:end] {
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if i == m.index%m.height {
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s.WriteString(m.cursorStyle.Render(m.cursor))
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} else {
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s.WriteString(strings.Repeat(" ", runewidth.StringWidth(m.cursor)))
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}
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if item.selected {
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s.WriteString(m.selectedItemStyle.Render(m.selectedPrefix + item.text))
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} else if i == m.index%m.height {
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s.WriteString(m.cursorStyle.Render(m.cursorPrefix + item.text))
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} else {
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s.WriteString(m.itemStyle.Render(m.unselectedPrefix + item.text))
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}
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if i != m.height {
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s.WriteRune('\n')
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}
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}
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if m.paginator.TotalPages <= 1 {
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return s.String()
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}
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s.WriteString(strings.Repeat("\n", m.height-m.paginator.ItemsOnPage(len(m.items))+1))
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s.WriteString(" " + m.paginator.View())
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return s.String()
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}
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//nolint:unparam
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func clamp(x, min, max int) int {
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if x < min {
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return min
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}
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if x > max {
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return max
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}
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return x
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}
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