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