gilo/internal/terminal/ansi.go

// ANSI Terminal Escape Codes and helpers
package terminal

import "fmt"

// ----------------------------------------------------------------------------
// !Terminal Escape Code Sequences
// ----------------------------------------------------------------------------

const EscPrefix = "\x1b["

const (
	// Clears the line after the escape sequence
	ClearLine = EscPrefix + "K"

	// Clears the entire screen
	ClearScreen = EscPrefix + "2J"
)

// Cursor Codes
const (
	HideCursor = EscPrefix + "?25l"
	ShowCursor = EscPrefix + "?25h"

	// Reports cursor location to stdout
	LocateCursor = EscPrefix + "6n"

	// Moves cursor to default position (1,1)
	ResetCursor = EscPrefix + "H"
)

// Color sequences
const (
	DefaultFGColor = EscPrefix + "39m"
	FGRed          = EscPrefix + "31m"
	InvertColor    = EscPrefix + "7m"
	ResetColor     = EscPrefix + "m"
)

// ----------------------------------------------------------------------------
// !Helpers
// ----------------------------------------------------------------------------

// Add the ANSI escape code prefix to the relevant escape code
func Code(s string, a ...interface{}) string {
	str := fmt.Sprintf(s, a...)

	return EscPrefix + str
}

// Generate the escape sequence to move the terminal cursor to the 0-based coordinate
func MoveCursor(x int, y int) string {
	// Allow 0-based indexing, the terminal code is 1-based
	x += 1
	y += 1

	return Code("%d;%dH", y, x)
}