commandinput

package
v0.0.0-...-ea2a2fb Latest Latest
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 Go to latest Published: Jul 16, 2023 License: MIT Imports: 14 Imported by: 1

Documentation

Overview

Package commandinput provides an implementation of the input.Input interface. It should be used to build interactive CLI applications.

Example 
package main

import (
	"fmt"
	"os"
	"strconv"

	prompt "github.com/aschey/bubbleprompt"
	"github.com/aschey/bubbleprompt/completer"
	"github.com/aschey/bubbleprompt/executor"
	"github.com/aschey/bubbleprompt/input/commandinput"
	"github.com/aschey/bubbleprompt/suggestion"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type secretMsg string

type cmdMetadata = commandinput.CommandMetadata[any]

type model struct {
	suggestions        []suggestion.Suggestion[cmdMetadata]
	textInput          *commandinput.Model[any]
	secret             string
	executorValueStyle lipgloss.Style
	filterer           completer.RecursiveFilterer[cmdMetadata]
}

func (m model) Complete(
	promptModel prompt.Model[cmdMetadata],
) ([]suggestion.Suggestion[cmdMetadata], error) {
	parsed := m.textInput.ParsedValue()
	completed := m.textInput.CompletedArgsBeforeCursor()
	if len(completed) == 1 && parsed.Command.Value == "get" && parsed.Args[0].Value == "weather" {
		flags := []commandinput.FlagInput{
			{
				Short:          "d",
				Long:           "days",
				ArgPlaceholder: m.textInput.NewFlagPlaceholder("<int>"),
				Description:    "Forecast days",
			},
		}
		return m.textInput.FlagSuggestions(
			m.textInput.CurrentTokenBeforeCursor().Value,
			flags,
			nil,
		), nil
	}
	return m.filterer.GetRecursiveSuggestions(
		m.textInput.Tokens(),
		m.textInput.CursorIndex(),
		m.suggestions,
	), nil
}

func (m model) Execute(input string, promptModel *prompt.Model[cmdMetadata]) (tea.Model, error) {
	parsed := m.textInput.ParsedValue()
	args := parsed.Args
	flags := parsed.Flags
	if len(args) == 0 {
		return nil, fmt.Errorf("1 argument required")
	}
	arg := args[0]
	switch parsed.Command.Value {
	case "get":
		switch arg.Value {
		case "weather":
			days := "1"
			if len(flags) > 0 {
				flag := flags[0]
				if flag.Name.Value == "-d" || flag.Name.Value == "--days" {
					if flag.Value == nil {
						return nil, fmt.Errorf("flag value required")
					}
					_, err := strconv.ParseInt(flag.Value.Value, 10, 64)
					if err != nil {
						return nil, fmt.Errorf("flag value must be a valid int")
					}
					days = flag.Value.Value
				}
			}
			days = m.executorValueStyle.Render(days)
			value := m.executorValueStyle.Render("cloudy with a chance of meatballs")
			return executor.NewStringModel(
				fmt.Sprintf("weather for the next %s day(s) is: %s", days, value),
			), nil
		case "secret":
			return executor.NewStringModel(
				"the secret is: " + m.executorValueStyle.Render(m.secret),
			), nil
		}
	case "set":
		switch arg.Value {
		case "secret":
			if len(args) < 2 {
				return nil, fmt.Errorf("secret value required")
			}
			secretVal := args[1]

			return executor.NewCmdModel("Secret updated", func() tea.Msg {
				return secretMsg(secretVal.Unquote())
			}), nil
		}
	}
	return nil, fmt.Errorf("Invalid input")
}

func (m model) Init() tea.Cmd {
	return nil
}

func (m model) Update(msg tea.Msg) (prompt.InputHandler[cmdMetadata], tea.Cmd) {
	if msg, ok := msg.(secretMsg); ok {
		m.secret = string(msg)
	}
	return m, nil
}

func main() {
	textInput := commandinput.New[any]()
	secretArgs := textInput.NewPositionalArgs("<secret value>")
	secretArgs[0].ArgStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("6"))

	suggestions := []suggestion.Suggestion[cmdMetadata]{
		{
			Text:        "get",
			Description: "retrieve things",
			Metadata: cmdMetadata{
				PositionalArgs: textInput.NewPositionalArgs("<command"),
				Children: []suggestion.Suggestion[cmdMetadata]{
					{
						Text:        "secret",
						Description: "get the secret",
					},
					{
						Text:        "weather",
						Description: "get the weather",
						Metadata: cmdMetadata{
							ShowFlagPlaceholder: true,
						},
					},
				},
			},
		},
		{
			Text:        "set",
			Description: "update things",
			Metadata: cmdMetadata{
				Children: []suggestion.Suggestion[cmdMetadata]{
					{
						Text:        "secret",
						Description: "update the secret",
						Metadata: cmdMetadata{
							PositionalArgs: secretArgs,
						},
					},
				},
			},
		},
	}
	model := model{
		suggestions:        suggestions,
		textInput:          textInput,
		secret:             "hunter2",
		executorValueStyle: lipgloss.NewStyle().Foreground(lipgloss.Color("13")),
		filterer:           completer.NewRecursiveFilterer[cmdMetadata](),
	}

	promptModel := prompt.New[cmdMetadata](
		model,
		textInput,
	)

	if _, err := tea.NewProgram(promptModel, tea.WithFilter(prompt.MsgFilter)).Run(); err != nil {
		fmt.Printf("Could not start program\n%v\n", err)
		os.Exit(1)
	}
}

Output:

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	DefaultPlaceholderForeground        = "14"
	DefaultCurrentPlaceholderSuggestion = "240"
	DefaultSelectedTextColor            = "10"
	DefaultFlagForeground               = "245"
	DefaultFlagPlaceholderForeground    = "14"
	DefaultBoolFlagForeground           = "13"
	DefaultNumberFlagForeground         = "5"
)

Functions

This section is empty.

Types

type Arg 

type Arg struct {
	Start int
	Value string
}

type CommandMetadata 

type CommandMetadata[T any] struct {
	// PositionalArgs is the list of positional args that this suggestion accepts.
	PositionalArgs []PositionalArg
	// ShowFlagPlaceholder is whether or not the input should display a placeholder
	// indicating that this command has flags available.
	ShowFlagPlaceholder bool
	// FlagArgPlaceholder is the placeholder
	FlagArgPlaceholder  FlagArgPlaceholder
	PreservePlaceholder bool
	Variadic            bool
	Children            []suggestion.Suggestion[CommandMetadata[T]]
	Extra               T
}

CommandMetadata defines the metadata that the Model uses to get information about the supplied suggestion.Suggestion. You can extend this struct to provide additional metadata.

func MetadataFromPositionalArgs 

func MetadataFromPositionalArgs[T any](positionalArgs ...PositionalArg) CommandMetadata[T]

MetadataFromPositionalArgs is a convenience function for creating a CommandMetadata from one or more PositionalArg.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
	"github.com/aschey/bubbleprompt/suggestion"
)

func main() {
	textInput := commandinput.New[commandinput.CommandMetadata[any]]()
	commandMetadata := commandinput.MetadataFromPositionalArgs[any](textInput.NewPositionalArg("<arg1>"))

	suggestions := []suggestion.Suggestion[commandinput.CommandMetadata[any]]{
		{Text: "test", Metadata: commandMetadata},
	}

	fmt.Println(suggestions[0].Metadata.PositionalArgs[0].Placeholder())
}

Output:

<arg1>

func (CommandMetadata[T]) GetChildren 

func (c CommandMetadata[T]) GetChildren() []suggestion.Suggestion[CommandMetadata[T]]

type Flag 

type Flag struct {
	Name  input.Token
	Value *input.Token
}

type FlagArgPlaceholder 

type FlagArgPlaceholder struct {
	Style lipgloss.Style
	// contains filtered or unexported fields
}

FlagArgPlaceholder is a flag placeholder for completions.

func (FlagArgPlaceholder) Text 

func (p FlagArgPlaceholder) Text() string

Text returns the placeholder text.

type FlagFormatter 

type FlagFormatter struct {
	// Flag handles styling for the flag itself.
	Flag lipgloss.Style
	// Placeholder handles styling for the placeholder that appears before the flag's argument is supplied (if applicable).
	Placeholder lipgloss.Style
}

FlagFormatter handles styling for flags.

type FlagInput 

type FlagInput struct {
	// Short is a short (single letter) flag with a single dash.
	// The leading dash can be optionally included.
	Short string
	// Long is a long (multi-letter) flag with multiple dashes.
	// The leading dashes can optionally be included.
	Long string
	// ArgPlaceholder is the placeholder for the flag argument (if applicable).
	ArgPlaceholder FlagArgPlaceholder
	// Description is the flag description.
	Description string
}

FlagInput is used to generate a list of flag suggestions.

func (FlagInput) LongFlag 

func (f FlagInput) LongFlag() string

ShortFlag returns the Long property formatted as a flag with the leading dashes.

func (FlagInput) RequiresArg 

func (f FlagInput) RequiresArg() bool

RequiresArg returns whether or not the input has an argument placeholder. If no placeholder is supplied, then it is assumed that the FlagInput does not require an argument.

func (FlagInput) ShortFlag 

func (f FlagInput) ShortFlag() string

ShortFlag returns the Short property formatted as a flag with a leading dash.

type FlagValueFormatter 

type FlagValueFormatter struct {
	// String handles styling for string values.
	String lipgloss.Style
	// Bool handles styling for boolean values.
	Bool lipgloss.Style
	// Number handles styling for numeric values.
	Number lipgloss.Style
}

FlagValueFormatter handles styling for different flag value data types.

type Formatters 

type Formatters struct {
	// PositionalArg handles styling for positional arguments.
	PositionalArg PositionalArgFormatter
	// Flag handles styling for flags.
	Flag FlagFormatter
	// FlagValue handles styling for a flag's value (if applicable).
	FlagValue FlagValueFormatter
	// Placeholder handles styling for placeholder that's shown as the user types the current argument.
	Placeholder lipgloss.Style
	// Prompt handles styling for the prompt that's shown before the user input.
	Prompt lipgloss.Style
	// Command handles styling for the command.
	Command lipgloss.Style
	// SelectedText handles styling for the text that's selected by the suggestion manager.
	SelectedText lipgloss.Style
	// Cursor handles styling for the cursor.
	Cursor lipgloss.Style
}

Formatters handles styling for the command input.

func DefaultFormatters 

func DefaultFormatters() Formatters

DefaultFormatters initializes the Formatters with sensible defaults. You can modify any settings that you wish after calling this function.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
	"github.com/charmbracelet/lipgloss"
)

func main() {
	defaultFormatters := commandinput.DefaultFormatters()
	defaultFormatters.Cursor = lipgloss.NewStyle().Foreground(lipgloss.Color("128"))
	fmt.Println(defaultFormatters.Cursor.GetForeground())

}

Output:

128

type Model 

type Model[T any] struct {
	// contains filtered or unexported fields
}

A Model is an input for handling CLI-style inputs. It provides advanced features such as placeholders and context-aware suggestions.

func New 

func New[T any](opts ...Option[T]) *Model[T]

New creates a new model.

func (*Model[T]) ArgsBeforeCursor 

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

ArgsBeforeCursor returns the positional arguments before the cursor position.

func (*Model[T]) Blur 

func (m *Model[T]) Blur()

Blur removes the focus from the input.

func (Model[T]) CommandBeforeCursor 

func (m Model[T]) CommandBeforeCursor() string

CommandBeforeCursor returns the portion of the command (first input token) before the cursor position.

func (Model[T]) CommandCompleted 

func (m Model[T]) CommandCompleted() bool

CommandCompleted returns whether the user finished typing the entire command (first token).

func (*Model[T]) CompletedArgsBeforeCursor 

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

CompletedArgsBeforeCursor returns the positional arguments before the cursor that have already been completed. In other words, there needs to be a delimiter after the argument to indicate that the user has finished entering in that argument.

func (Model[T]) CurrentToken 

func (m Model[T]) CurrentToken() input.Token

CurrentToken returns the token under the cursor. If the cursor is between two tokens, it will take the token after the cursor.

func (Model[T]) CurrentTokenBeforeCursor 

func (m Model[T]) CurrentTokenBeforeCursor() input.Token

CurrentTokenBeforeCursor returns the portion of the current token before the cursor. If the cursor is between two tokens, it will take the token after the cursor.

func (Model[T]) CurrentTokenBeforeCursorRoundDown 

func (m Model[T]) CurrentTokenBeforeCursorRoundDown() input.Token

CurrentTokenBeforeCursorRoundDown returns the portion of the current token before the cursor. If the cursor is between two tokens, it will take the token before the cursor.

func (Model[T]) CurrentTokenRoundDown 

func (m Model[T]) CurrentTokenRoundDown() input.Token

CurrentTokenRoundDown returns the token under the cursor. If the cursor is between two tokens, it will take the token before the cursor.

func (Model[T]) CursorIndex 

func (m Model[T]) CursorIndex() int

CursorIndex returns the cursor index in terms of number of unicode characters. Use this to calculate input lengths in terms of number of characters entered.

func (Model[T]) CursorOffset 

func (m Model[T]) CursorOffset() int

CursorOffset returns the visual offset of the cursor in terms of number of terminal cells. Use this for calculating visual dimensions such as input width/height.

func (*Model[T]) FlagSuggestions 

func (m *Model[T]) FlagSuggestions(
	inputStr string,
	flags []FlagInput,
	suggestionFunc func(FlagInput) CommandMetadata[T],
) []suggestion.Suggestion[CommandMetadata[T]]

FlagSuggestions generates a list of suggestion.Suggestion based on the input string and the list of FlagInput supplied. The last parameter can be used to customize the metadata for the returned suggestions.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
)

func main() {
	textInput := commandinput.New[any]()
	flags := []commandinput.FlagInput{
		{
			Short:          "i",
			Long:           "interval",
			Description:    "refresh interval",
			ArgPlaceholder: textInput.NewFlagPlaceholder("<value>"),
		},
	}

	suggestions := textInput.FlagSuggestions("", flags, nil)
	fmt.Printf("Text: %s, Description: %s\n", suggestions[0].Text, suggestions[0].Description)

	suggestions = textInput.FlagSuggestions("--", flags, nil)
	fmt.Printf("Text: %s, Description: %s\n", suggestions[0].Text, suggestions[0].Description)

	suggestions = textInput.FlagSuggestions("", flags,
		func(flagInput commandinput.FlagInput) commandinput.CommandMetadata[any] {
			return commandinput.CommandMetadata[any]{
				FlagArgPlaceholder:  flagInput.ArgPlaceholder,
				PreservePlaceholder: true,
			}
		})
	fmt.Printf(
		"Text: %s, Description: %s, Preserve Placeholder: %t\n",
		suggestions[0].Text,
		suggestions[0].Description,
		suggestions[0].Metadata.PreservePlaceholder,
	)

}

Output:

Text: -i, Description: refresh interval
Text: --interval, Description: refresh interval
Text: -i, Description: refresh interval, Preserve Placeholder: true

func (*Model[T]) Focus 

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

Focus sets the keyboard focus on the editor so the user can enter text.

func (Model[T]) Focused 

func (m Model[T]) Focused() bool

Focused returns whether the keyboard is focused on the input.

func (Model[T]) Formatters 

func (m Model[T]) Formatters() Formatters

Formatters returns the formatters used by the input.

func (Model[T]) HasArgs 

func (m Model[T]) HasArgs() bool

HasArgs returns whether the input has any positional arguments.

func (Model[T]) LastArg 

func (m Model[T]) LastArg() *input.Token

LastArg returns the last positional argument in the input. If there are no arguments, it returns nil.

func (*Model[T]) NewFlagPlaceholder 

func (m *Model[T]) NewFlagPlaceholder(placeholder string) FlagArgPlaceholder

NewFlagPlaceholder creates a flag placeholder for completions.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
)

func main() {
	textInput := commandinput.New[commandinput.CommandMetadata[any]]()

	flags := []commandinput.FlagInput{
		{
			Short:          "d",
			Long:           "days",
			ArgPlaceholder: textInput.NewFlagPlaceholder("<number of days>"),
			Description:    "Forecast days",
		},
	}

	fmt.Println(flags[0].ArgPlaceholder.Text())
}

Output:

<number of days>

func (*Model[T]) NewPositionalArg 

func (m *Model[T]) NewPositionalArg(placeholder string) PositionalArg

NewPositionalArg creates a positional arg placeholder for completions.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
	"github.com/aschey/bubbleprompt/suggestion"
)

func main() {
	textInput := commandinput.New[commandinput.CommandMetadata[any]]()
	commandMetadata := commandinput.CommandMetadata[any]{
		PositionalArgs: []commandinput.PositionalArg{textInput.NewPositionalArg("<arg1>")},
	}

	suggestions := []suggestion.Suggestion[commandinput.CommandMetadata[any]]{
		{Text: "test", Metadata: commandMetadata},
	}

	fmt.Println(suggestions[0].Metadata.PositionalArgs[0].Placeholder())
}

Output:

<arg1>

func (*Model[T]) NewPositionalArgs 

func (m *Model[T]) NewPositionalArgs(placeholders ...string) []PositionalArg

NewPositionalArgs creates multiple positional arg placeholders for completions.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
	"github.com/aschey/bubbleprompt/suggestion"
)

func main() {
	textInput := commandinput.New[commandinput.CommandMetadata[any]]()
	commandMetadata := commandinput.CommandMetadata[any]{
		PositionalArgs: textInput.NewPositionalArgs("<arg1>", "<arg2>"),
	}

	suggestions := []suggestion.Suggestion[commandinput.CommandMetadata[any]]{
		{Text: "test", Metadata: commandMetadata},
	}

	fmt.Println(suggestions[0].Metadata.PositionalArgs[0].Placeholder())
	fmt.Println(suggestions[0].Metadata.PositionalArgs[1].Placeholder())
}

Output:

<arg1>
<arg2>

func (*Model[T]) OnExecutorFinished 

func (m *Model[T]) OnExecutorFinished()

OnExecutorFinished is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) OnSuggestionChanged 

func (m *Model[T]) OnSuggestionChanged(suggestion suggestion.Suggestion[CommandMetadata[T]])

OnSuggestionChanged is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) OnSuggestionUnselected 

func (m *Model[T]) OnSuggestionUnselected()

OnSuggestionUnselected is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) OnUpdateFinish 

func (m *Model[T]) OnUpdateFinish(
	msg tea.Msg,
	suggestion *suggestion.Suggestion[CommandMetadata[T]],
	isSelected bool,
) tea.Cmd

OnUpdateFinish is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) OnUpdateStart 

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

OnUpdateStart is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) ParseUsage 

func (m *Model[T]) ParseUsage(placeholders string) ([]PositionalArg, error)

ParseUsage generates a list of PositionalArg from a usage string.

Example 
package main

import (
	"fmt"

	"github.com/aschey/bubbleprompt/input/commandinput"
)

func main() {
	textInput := commandinput.New[commandinput.CommandMetadata[any]]()

	usage := `<mandatory arg> [optional arg] 'quoted arg' "double quoted arg" normal-arg`
	args, err := textInput.ParseUsage(usage)
	if err != nil {
		panic(err)
	}
	fmt.Printf("%s\n%s\n%s\n%s\n%s",
		args[0].Placeholder(),
		args[1].Placeholder(),
		args[2].Placeholder(),
		args[3].Placeholder(),
		args[4].Placeholder())

}

Output:

<mandatory arg>
[optional arg]
'quoted arg'
"double quoted arg"
normal-arg

func (Model[T]) ParsedValue 

func (m Model[T]) ParsedValue() Statement

ParsedValue returns the input parsed into a Statement.

func (*Model[T]) Prompt 

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

Prompt returns the terminal prompt.

func (*Model[T]) ResetValue 

func (m *Model[T]) ResetValue()

ResetValue clears the entire input.

func (Model[T]) Runes 

func (m Model[T]) Runes() []rune

Runes returns the raw text entered by the user as a list of runes. This is useful for indexing and length checks because doing these operations on strings does not work well with some unicode characters.

func (*Model[T]) SetCursor 

func (m *Model[T]) SetCursor(pos int)

SetCursor sets the cursor position.

func (*Model[T]) SetCursorMode 

func (m *Model[T]) SetCursorMode(cursorMode cursor.Mode) tea.Cmd

SetCursorMode sets the mode of the cursor.

func (*Model[T]) SetFormatters 

func (m *Model[T]) SetFormatters(formatters Formatters)

SetFormatters sets the formatters used by the input.

func (*Model[T]) SetPrompt 

func (m *Model[T]) SetPrompt(prompt string)

SetPrompt sets the terminal prompt.

func (*Model[T]) SetValue 

func (m *Model[T]) SetValue(s string)

SetValue overwrites the entire input with the given string.

func (*Model[T]) ShouldClearSuggestions 

func (m *Model[T]) ShouldClearSuggestions(prevText []rune, msg tea.KeyMsg) bool

ShouldClearSuggestions is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) ShouldSelectSuggestion 

func (m *Model[T]) ShouldSelectSuggestion(suggestion suggestion.Suggestion[CommandMetadata[T]]) bool

ShouldSelectSuggestion is part of the input.Input interface. It should not be invoked by users of this library.

func (*Model[T]) ShouldUnselectSuggestion 

func (m *Model[T]) ShouldUnselectSuggestion(prevRunes []rune, msg tea.KeyMsg) bool

ShouldUnselectSuggestion is part of the input.Input interface. It should not be invoked by users of this library.

func (Model[T]) SuggestionRunes 

func (m Model[T]) SuggestionRunes(runes []rune) []rune

SuggestionRunes is part of the input.Input interface. It should not be invoked by users of this library.

func (Model[T]) Tokens 

func (m Model[T]) Tokens() []input.Token

Tokens returns the entire input as a list of input.Token.

func (Model[T]) TokensBeforeCursor 

func (m Model[T]) TokensBeforeCursor() []input.Token

TokensBeforeCursor returns the tokenized input before the cursor position.

func (Model[T]) Value 

func (m Model[T]) Value() string

Value returns the raw text entered by the user.

func (Model[T]) Values 

func (m Model[T]) Values() []string

Values returns the tokenized input values.

func (Model[T]) ValuesBeforeCursor 

func (m Model[T]) ValuesBeforeCursor() []string

ValuesBeforeCursor returns the token values of the entire input before the cursor position.

func (Model[T]) View 

func (m Model[T]) View(viewMode input.ViewMode) string

View is part of the input.Input interface. It should not be invoked by users of this library.

type Option 

type Option[T any] func(model *Model[T])

func WithCursorMode 

func WithCursorMode[T any](cursorMode cursor.Mode) Option[T]

func WithDefaultDelimiter 

func WithDefaultDelimiter[T any](defaultDelimiter string) Option[T]

func WithFormatters 

func WithFormatters[T any](formatters Formatters) Option[T]

func WithPrompt 

func WithPrompt[T any](prompt string) Option[T]

type PositionalArg 

type PositionalArg struct {
	PlaceholderStyle lipgloss.Style
	ArgStyle         lipgloss.Style
	// contains filtered or unexported fields
}

PositionalArg is a positional arg placeholder for completions.

func (PositionalArg) Placeholder 

func (p PositionalArg) Placeholder() string

Placeholder returns the text value of the placeholder text.

type PositionalArgFormatter 

type PositionalArgFormatter struct {
	// Placeholder handles styling for the placeholder that appears before the argument is supplied.
	Placeholder lipgloss.Style
	// Arg handles styling for the argument that is supplied.
	Arg lipgloss.Style
}

PositionalArgFormatter handles styling for positional arguments.

type Statement 

type Statement struct {
	Command input.Token
	Args    []input.Token
	Flags   []Flag
}

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