selection

package
v0.9.0 Latest Latest
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 Go to latest Published: Aug 8, 2023 License: MIT Imports: 12 Imported by: 57

Documentation

Overview

Package selection implements a selection prompt that allows users to select one of the pre-defined choices. It also offers customizable appreance and key map as well as optional support for pagination, filtering.

Index

Constants

View Source 
const (
	// DefaultTemplate defines the default appearance of the selection and can
	// be copied as a starting point for a custom template.
	DefaultTemplate = `` /* 527-byte string literal not displayed */

	// DefaultResultTemplate defines the default appearance with which the
	// finale result of the selection is presented.
	DefaultResultTemplate = `
	{{- print .Prompt " " (Final .FinalChoice) "\n" -}}
	`

	// DefaultFilterPrompt is the default prompt for the filter input when
	// filtering is enabled.
	DefaultFilterPrompt = "Filter:"

	// DefaultFilterPlaceholder is printed by default when no filter text was
	// entered yet.
	DefaultFilterPlaceholder = "Type to filter choices"
)

Variables

This section is empty.

Functions

func DefaultFinalChoiceStyle added in v0.5.0 

func DefaultFinalChoiceStyle[T any](c *Choice[T]) string

DefaultFinalChoiceStyle is the default style for final choices.

func DefaultSelectedChoiceStyle added in v0.5.0 

func DefaultSelectedChoiceStyle[T any](c *Choice[T]) string

DefaultSelectedChoiceStyle is the default style for selected choices.

func FilterContainsCaseInsensitive 

func FilterContainsCaseInsensitive[T any](filter string, choice *Choice[T]) bool

FilterContainsCaseInsensitive returns true if the string representation of the choice contains the filter string without regard for capitalization.

func FilterContainsCaseSensitive 

func FilterContainsCaseSensitive[T any](filter string, choice *Choice[T]) bool

FilterContainsCaseSensitive returns true if the string representation of the choice contains the filter string respecting capitalization.

Types

type Choice 

type Choice[T any] struct {
	String string
	Value  T
	// contains filtered or unexported fields
}

Choice represents a single choice. This type used as an input for the selection prompt, for filtering and as a result value.

func (*Choice[T]) Index 

func (c *Choice[T]) Index() int

Index returns the current index of the choice.

type KeyMap 

type KeyMap struct {
	Down        []string
	Up          []string
	Select      []string
	Abort       []string
	ClearFilter []string
	ScrollDown  []string
	ScrollUp    []string
}

KeyMap defines the keys that trigger certain actions.

func NewDefaultKeyMap 

func NewDefaultKeyMap() *KeyMap

NewDefaultKeyMap returns a KeyMap with sensible default key mappings that can also be used as a starting point for customization.

type Model 

type Model[T any] struct {
	*Selection[T]

	// Err holds errors that may occur during the execution of
	// the selection prompt.
	Err error

	// MaxWidth limits the width of the view using the Selection's WrapMode.
	MaxWidth int
	// contains filtered or unexported fields
}

Model implements the bubbletea.Model for a selection prompt.

func NewModel 

func NewModel[T any](selection *Selection[T]) *Model[T]

NewModel returns a new selection prompt model for the provided choices.

func (*Model[T]) Init 

func (m *Model[T]) Init() tea.Cmd

Init initializes the selection prompt model.

func (*Model[T]) Update 

func (m *Model[T]) Update(msg tea.Msg) (tea.Model, tea.Cmd)

Update updates the model based on the received message.

func (*Model[T]) Value 

func (m *Model[T]) Value() (T, error)

Value returns the choice that is currently selected or the final choice after the prompt has concluded.

func (*Model[T]) ValueAsChoice added in v0.8.0 

func (m *Model[T]) ValueAsChoice() (*Choice[T], error)

ValueAsChoice returns the selected value wrapped in a Choice struct.

func (*Model[T]) View 

func (m *Model[T]) View() string

View renders the selection prompt.

type Selection 

type Selection[T any] struct {

	// Prompt holds the prompt text or question that is to be answered by one of
	// the choices.
	Prompt string

	// FilterPrompt is the prompt for the filter if filtering is enabled.
	FilterPrompt string

	// Filter is a function that decides whether a given choice should be
	// displayed based on the text entered by the user into the filter input
	// field. If Filter is nil, filtering will be disabled. By default the
	// filter FilterContainsCaseInsensitive is used.
	Filter func(filterText string, choice *Choice[T]) bool

	// FilterPlaceholder holds the text that is displayed in the filter input
	// field when no text was entered by the user yet. If empty, the
	// DefaultFilterPlaceholder is used. If Filter is nil, filtering is disabled
	// and FilterPlaceholder does nothing.
	FilterPlaceholder string

	// PageSize is the number of choices that are displayed at once. If PageSize
	// is smaller than the number of choices, pagination is enabled. If PageSize
	// is 0, pagenation is disabled. Regardless of the value of PageSize,
	// pagination is always enabled when the prompt does not fit the terminal.
	PageSize int

	// LoopCursor enables the cursor to loop around to the first choice when
	// navigating down from the last choice and the other way around.
	LoopCursor bool

	// Template holds the display template. A custom template can be used to
	// completely customize the appearance of the selection prompt. If empty,
	// the DefaultTemplate is used. The following variables and functions are
	// available:
	//
	//  * Prompt string: The configured prompt.
	//  * IsFiltered bool: Whether or not filtering is enabled.
	//  * FilterPrompt string: The configured filter prompt.
	//  * FilterInput string: The view of the filter input model.
	//  * Choices []*Choice: The choices on the current page.
	//  * NChoices int: The number of choices on the current page.
	//  * SelectedIndex int: The index that is currently selected.
	//  * PageSize int: The configured page size.
	//  * IsPaged bool: Whether pagination is currently active.
	//  * AllChoices []*Choice: All configured choices.
	//  * NAllChoices int: The number of configured choices.
	//  * TerminalWidth int: The width of the terminal.
	//  * Selected(*Choice) string: The configured SelectedChoiceStyle.
	//  * Unselected(*Choice) string: The configured UnselectedChoiceStyle.
	//  * IsScrollDownHintPosition(idx int) bool: Returns whether
	//    the scroll down hint should be displayed at the given index.
	//  * IsScrollUpHintPosition(idx int) bool: Returns whether the
	//    scroll up hint should be displayed at the given index).
	//  * promptkit.UtilFuncMap: Handy helper functions.
	//  * termenv TemplateFuncs (see https://github.com/muesli/termenv).
	//  * The functions specified in ExtendedTemplateFuncs.
	Template string

	// ResultTemplate is rendered as soon as a choice has been selected.
	// It is intended to permanently indicate the result of the prompt when the
	// selection itself has disappeared. This template is only rendered in the
	// Run() method and NOT when the selection prompt is used as a model. The
	// following variables and functions are available:
	//
	//  * FinalChoice: The choice that was selected by the user.
	//  * Prompt string: The configured prompt.
	//  * AllChoices []*Choice: All configured choices.
	//  * NAllChoices int: The number of configured choices.
	//  * TerminalWidth int: The width of the terminal.
	//  * Final(*Choice) string: The configured FinalChoiceStyle.
	//  * promptkit.UtilFuncMap: Handy helper functions.
	//  * termenv TemplateFuncs (see https://github.com/muesli/termenv).
	//  * The functions specified in ExtendedTemplateFuncs.
	ResultTemplate string

	// ExtendedTemplateFuncs can be used to add additional functions to the
	// evaluation scope of the templates.
	ExtendedTemplateFuncs template.FuncMap

	// Styles of the filter input field. These will be applied as inline styles.
	//
	// For an introduction to styling with Lip Gloss see:
	// https://github.com/charmbracelet/lipgloss
	FilterInputTextStyle        lipgloss.Style
	FilterInputBackgroundStyle  lipgloss.Style // Deprecated: This property is not used anymore.
	FilterInputPlaceholderStyle lipgloss.Style
	FilterInputCursorStyle      lipgloss.Style

	// SelectedChoice style allows to customize the appearance of the currently
	// selected choice. By default DefaultSelectedChoiceStyle is used. If it is
	// nil, no style will be applied and the plain string representation of the
	// choice will be used. This style will be available as the template
	// function Selected. Custom templates may or may not use this function.
	SelectedChoiceStyle func(*Choice[T]) string

	// UnselectedChoiceStyle style allows to customize the appearance of the
	// currently unselected choice. By default it is nil, such that no style
	// will be applied and the plain string representation of the choice will be
	// used. This style will be available as the template function Unselected.
	// Custom templates may or may not use this function.
	UnselectedChoiceStyle func(*Choice[T]) string

	// FinalChoiceStyle style allows to customize the appearance of the choice
	// that was ultimately chosen. By default DefaultFinalChoiceStyle is used.
	// If it is nil, no style will be applied and the plain string
	// representation of the choice will be used. This style will be available
	// as the template function Final. Custom templates may or may not use this
	// function.
	FinalChoiceStyle func(*Choice[T]) string

	// KeyMap determines with which keys the selection prompt is controlled. By
	// default, DefaultKeyMap is used.
	KeyMap *KeyMap

	// WrapMode decides which way the prompt view is wrapped if it does not fit
	// the terminal. It can be a WrapMode provided by promptkit or a custom
	// function. By default it is promptkit.WordWrap. It can also be nil which
	// disables wrapping and likely causes output glitches.
	WrapMode promptkit.WrapMode

	// Output is the output writer, by default os.Stdout is used.
	Output io.Writer
	// Input is the input reader, by default, os.Stdin is used.
	Input io.Reader

	// ColorProfile determines how colors are rendered. By default, the terminal
	// is queried.
	ColorProfile termenv.Profile
	// contains filtered or unexported fields
}

Selection represents a configurable selection prompt.

func New 

func New[T any](prompt string, choices []T) *Selection[T]

New creates a new selection prompt. See the Selection properties for more documentation.

func (*Selection[T]) RunPrompt 

func (s *Selection[T]) RunPrompt() (T, error)

RunPrompt executes the selection prompt.

Source Files

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