103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
package terminal
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import (
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"bufio"
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)
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// Pre-allocated ANSI sequence fragments (avoid allocations during render)
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var (
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// CSI sequences
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csi = []byte("\x1b[")
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csiClear = []byte("\x1b[2J\x1b[H")
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csiRIS = []byte("\x1bc") // Reset to Initial State (emergency)
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csiSGR0 = []byte("\x1b[0m")
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// Cursor control
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csiCursorHide = []byte("\x1b[?25l")
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csiCursorShow = []byte("\x1b[?25h")
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csiCursorPos = []byte("\x1b[") // followed by row;colH
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// Screen modes; the alternate screen also turns off the terminal's own bidi
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// reordering (ECMA-48 BDSM, mode 8), so right-to-left text keeps its cells
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csiAltScreenEnter = []byte("\x1b[?1049h\x1b[8l")
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csiAltScreenExit = []byte("\x1b[?1049l\x1b[8h")
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// DECAWM: Auto-Wrap Mode
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// ?7l disables wrapping (cursor sticks at right edge), preventing scroll when writing to bottom-right corner
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csiAutoWrapOn = []byte("\x1b[?7h")
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csiAutoWrapOff = []byte("\x1b[?7l")
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// Color parameters, after 38 or 48
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sgrPalette = []byte(";5;") // followed by N
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sgrRGB = []byte(";2;") // followed by R;G;B
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// Mouse mode sequences (SGR 1006 for extended coordinates)
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csiMouseClickOn = []byte("\x1b[?1000h") // Enable click reporting
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csiMouseClickOff = []byte("\x1b[?1000l")
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csiMouseDragOn = []byte("\x1b[?1002h") // Enable button-event (drag) tracking
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csiMouseDragOff = []byte("\x1b[?1002l")
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csiMouseMotionOn = []byte("\x1b[?1003h") // Enable any-event (all motion) tracking
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csiMouseMotionOff = []byte("\x1b[?1003l")
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csiMouseSGROn = []byte("\x1b[?1006h") // Enable SGR extended mode
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csiMouseSGROff = []byte("\x1b[?1006l")
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// Bracketed paste: the terminal wraps pasted text in pasteStart, pasteEnd
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csiPasteOn = []byte("\x1b[?2004h")
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csiPasteOff = []byte("\x1b[?2004l")
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pasteStart = []byte("\x1b[200~")
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pasteEnd = []byte("\x1b[201~")
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)
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// writeInt writes an integer without allocation
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// Optimized for terminal values (0-255 common, 0-999 typical max)
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func writeInt(w *bufio.Writer, n int) {
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if n < 0 {
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n = 0
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}
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if n < 10 {
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w.WriteByte(byte(n) + '0')
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return
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}
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if n < 100 {
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w.WriteByte(byte(n/10) + '0')
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w.WriteByte(byte(n%10) + '0')
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return
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}
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if n < 1000 {
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w.WriteByte(byte(n/100) + '0')
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w.WriteByte(byte(n/10%10) + '0')
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w.WriteByte(byte(n%10) + '0')
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return
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}
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var buf [5]byte
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i := 4
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for n > 0 {
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buf[i] = byte(n%10) + '0'
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n /= 10
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i--
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}
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w.Write(buf[i+1:])
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}
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// writeCursorPos writes cursor positioning sequence (0-indexed input)
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func writeCursorPos(w *bufio.Writer, x, y int) {
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w.Write(csiCursorPos)
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writeInt(w, y+1)
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w.WriteByte(';')
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writeInt(w, x+1)
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w.WriteByte('H')
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}
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// writeCursorForward writes cursor forward N positions
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func writeCursorForward(w *bufio.Writer, n int) {
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if n <= 0 {
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return
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}
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if n == 1 {
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w.Write([]byte("\x1b[C"))
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return
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}
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w.Write(csi)
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writeInt(w, n)
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w.WriteByte('C')
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}
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