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package ansi
import "strconv"
// EraseDisplay (ED) clears the screen or parts of the screen. Possible values:
//
// 0: Clear from cursor to end of screen.
// 1: Clear from cursor to beginning of the screen.
// 2: Clear entire screen (and moves cursor to upper left on DOS).
// 3: Clear entire screen and delete all lines saved in the scrollback buffer.
//
// CSI <n> J
//
// See: https://vt100.net/docs/vt510-rm/ED.html
func EraseDisplay(n int) string {
if n < 0 {
n = 0
}
return "\x1b[" + strconv.Itoa(n) + "J"
}
// EraseDisplay constants.
// These are the possible values for the EraseDisplay function.
const (
EraseDisplayRight = "\x1b[0J"
EraseDisplayLeft = "\x1b[1J"
EraseEntireDisplay = "\x1b[2J"
)
// EraseLine (EL) clears the current line or parts of the line. Possible values:
//
// 0: Clear from cursor to end of line.
// 1: Clear from cursor to beginning of the line.
// 2: Clear entire line.
//
// The cursor position is not affected.
//
// CSI <n> K
//
// See: https://vt100.net/docs/vt510-rm/EL.html
func EraseLine(n int) string {
if n < 0 {
n = 0
}
return "\x1b[" + strconv.Itoa(n) + "K"
}
// EraseLine constants.
// These are the possible values for the EraseLine function.
const (
EraseLineRight = "\x1b[0K"
EraseLineLeft = "\x1b[1K"
EraseEntireLine = "\x1b[2K"
)
// ScrollUp (SU) scrolls the screen up n lines. New lines are added at the
// bottom of the screen.
//
// CSI <n> S
//
// See: https://vt100.net/docs/vt510-rm/SU.html
func ScrollUp(n int) string {
var s string
if n > 1 {
s = strconv.Itoa(n)
}
return "\x1b[" + s + "S"
}
// ScrollDown (SD) scrolls the screen down n lines. New lines are added at the
// top of the screen.
//
// CSI <n> T
//
// See: https://vt100.net/docs/vt510-rm/SD.html
func ScrollDown(n int) string {
var s string
if n > 1 {
s = strconv.Itoa(n)
}
return "\x1b[" + s + "T"
}
// InsertLine (IL) inserts n blank lines at the current cursor position.
// Existing lines are moved down.
//
// CSI <n> L
//
// See: https://vt100.net/docs/vt510-rm/IL.html
func InsertLine(n int) string {
var s string
if n > 1 {
s = strconv.Itoa(n)
}
return "\x1b[" + s + "L"
}
// DeleteLine (DL) deletes n lines at the current cursor position. Existing
// lines are moved up.
//
// CSI <n> M
//
// See: https://vt100.net/docs/vt510-rm/DL.html
func DeleteLine(n int) string {
var s string
if n > 1 {
s = strconv.Itoa(n)
}
return "\x1b[" + s + "M"
}
// SetScrollingRegion (DECSTBM) sets the top and bottom margins for the scrolling
// region. The default is the entire screen.
//
// CSI <top> ; <bottom> r
//
// See: https://vt100.net/docs/vt510-rm/DECSTBM.html
func SetScrollingRegion(t, b int) string {
if t < 0 {
t = 0
}
if b < 0 {
b = 0
}
return "\x1b[" + strconv.Itoa(t) + ";" + strconv.Itoa(b) + "r"
}
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