chore: vendor

vendor/github.com/charmbracelet/x/ansi/passthrough.go

@@ -0,0 +1,63 @@
+package ansi
+
+import (
+	"bytes"
+)
+
+// ScreenPassthrough wraps the given ANSI sequence in a DCS passthrough
+// sequence to be sent to the outer terminal. This is used to send raw escape
+// sequences to the outer terminal when running inside GNU Screen.
+//
+//	DCS <data> ST
+//
+// Note: Screen limits the length of string sequences to 768 bytes (since 2014).
+// Use zero to indicate no limit, otherwise, this will chunk the returned
+// string into limit sized chunks.
+//
+// See: https://www.gnu.org/software/screen/manual/screen.html#String-Escapes
+// See: https://git.savannah.gnu.org/cgit/screen.git/tree/src/screen.h?id=c184c6ec27683ff1a860c45be5cf520d896fd2ef#n44
+func ScreenPassthrough(seq string, limit int) string {
+	var b bytes.Buffer
+	b.WriteString("\x1bP")
+	if limit > 0 {
+		for i := 0; i < len(seq); i += limit {
+			end := i + limit
+			if end > len(seq) {
+				end = len(seq)
+			}
+			b.WriteString(seq[i:end])
+			if end < len(seq) {
+				b.WriteString("\x1b\\\x1bP")
+			}
+		}
+	} else {
+		b.WriteString(seq)
+	}
+	b.WriteString("\x1b\\")
+	return b.String()
+}
+
+// TmuxPassthrough wraps the given ANSI sequence in a special DCS passthrough
+// sequence to be sent to the outer terminal. This is used to send raw escape
+// sequences to the outer terminal when running inside Tmux.
+//
+//	DCS tmux ; <escaped-data> ST
+//
+// Where <escaped-data> is the given sequence in which all occurrences of ESC
+// (0x1b) are doubled i.e. replaced with ESC ESC (0x1b 0x1b).
+//
+// Note: this needs the `allow-passthrough` option to be set to `on`.
+//
+// See: https://github.com/tmux/tmux/wiki/FAQ#what-is-the-passthrough-escape-sequence-and-how-do-i-use-it
+func TmuxPassthrough(seq string) string {
+	var b bytes.Buffer
+	b.WriteString("\x1bPtmux;")
+	for i := 0; i < len(seq); i++ {
+		if seq[i] == ESC {
+			b.WriteByte(ESC)
+		}
+		b.WriteByte(seq[i])
+	}
+	b.WriteString("\x1b\\")
+	return b.String()
+}