From 414d23ccb1f56633afd8d13f40f964bbb221aa8b Mon Sep 17 00:00:00 2001
From: Liam Galvin <liam@liam-galvin.co.uk>
Date: Sat, 24 Nov 2018 21:56:48 +0000
Subject: [PATCH] Add support for CSI ICH (@)

---
 buffer/buffer.go | 10 ++++++++++
 terminal/csi.go  | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/buffer/buffer.go b/buffer/buffer.go
index c00e821..9ebc535 100644
--- a/buffer/buffer.go
+++ b/buffer/buffer.go
@@ -482,6 +482,16 @@ func (buffer *Buffer) insertLine() {
 	}
 }
 
+func (buffer *Buffer) InsertBlankCharacters(count int) {
+
+	index := int(buffer.RawLine())
+	for i := 0; i < count; i++ {
+		cells := buffer.lines[index].cells
+		c := Cell{}
+		buffer.lines[index].cells = append(cells[:buffer.cursorX], append([]Cell{c}, cells[buffer.cursorX:]...)...)
+	}
+}
+
 func (buffer *Buffer) InsertLines(count int) {
 
 	if buffer.HasScrollableRegion() && !buffer.InScrollableRegion() {
diff --git a/terminal/csi.go b/terminal/csi.go
index 34d4c5c..7ef6781 100644
--- a/terminal/csi.go
+++ b/terminal/csi.go
@@ -46,6 +46,7 @@ var csiSequences = []csiMapping{
 	{id: 'S', handler: csiScrollUpHandler, description: "Scroll up Ps lines (default = 1) (SU), VT420, ECMA-48"},
 	{id: 'T', handler: csiScrollDownHandler, description: "Scroll down Ps lines (default = 1) (SD), VT420"},
 	{id: 'X', handler: csiEraseCharactersHandler, description: "Erase Ps Character(s) (default = 1) (ECH"},
+	{id: '@', handler: csiInsertBlankCharactersHandler, description: "Insert Ps (Blank) Character(s) (default = 1) (ICH)"},
 }
 
 func csiHandler(pty chan rune, terminal *Terminal) error {
@@ -259,6 +260,24 @@ func csiScrollUpHandler(params []string, intermediate string, terminal *Terminal
 	return nil
 }
 
+func csiInsertBlankCharactersHandler(params []string, intermediate string, terminal *Terminal) error {
+	count := 1
+	if len(params) > 1 {
+		return fmt.Errorf("Not supported")
+	}
+	if len(params) == 1 {
+		var err error
+		count, err = strconv.Atoi(params[0])
+		if err != nil || count < 1 {
+			count = 1
+		}
+	}
+
+	terminal.ActiveBuffer().InsertBlankCharacters(count)
+
+	return nil
+}
+
 func csiInsertLinesHandler(params []string, intermediate string, terminal *Terminal) error {
 	count := 1
 	if len(params) > 1 {