more efficient text rendering and streamlining of output handling

Makefile

@@ -22,12 +22,6 @@ install-tools:
 	which dep || curl -L https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
 	which packr || go get -u github.com/gobuffalo/packr/packr
 
-.PHONY: update-fonts
-update-fonts: install-tools
-	curl -L https://github.com/ryanoasis/nerd-fonts/raw/master/patched-fonts/Hack/Regular/complete/Hack%20Regular%20Nerd%20Font%20Complete.ttf -o "${FONTPATH}/Hack Regular Nerd Font Complete.ttf"
-	curl -L https://github.com/ryanoasis/nerd-fonts/raw/master/patched-fonts/Hack/Bold/complete/Hack%20Bold%20Nerd%20Font%20Complete.ttf -o "${FONTPATH}/Hack Bold Nerd Font Complete.ttf"
-	packr -v
-
 .PHONY:	build-linux
 build-linux:
 	mkdir -p bin/linux

buffer/buffer.go

@@ -610,20 +610,10 @@ func (buffer *Buffer) ReverseIndex() {
 func (buffer *Buffer) Write(runes ...rune) {
 
 	// scroll to bottom on input
-	inc := true
 	buffer.scrollLinesFromBottom = 0
 
 	for _, r := range runes {
-		if r == 0x0a {
-			buffer.NewLine()
-			continue
-		} else if r == 0x0d {
-			buffer.CarriageReturn()
-			continue
-		} else if r == 0x9 {
-			buffer.Tab()
-			continue
-		}
+
 		line := buffer.getCurrentLine()
 
 		if buffer.replaceMode {
@@ -634,7 +624,7 @@ func (buffer *Buffer) Write(runes ...rune) {
 			}
 
 			for int(buffer.CursorColumn()) >= len(line.cells) {
-				line.cells = append(line.cells, NewBackgroundCell(buffer.cursorAttr.BgColour))
+				line.cells = append(line.cells, Cell{})
 			}
 			line.cells[buffer.cursorX].attr = buffer.cursorAttr
 			line.cells[buffer.cursorX].setRune(r)
@@ -665,31 +655,23 @@ func (buffer *Buffer) Write(runes ...rune) {
 		} else {
 
 			for int(buffer.CursorColumn()) >= len(line.cells) {
-				line.cells = append(line.cells, NewBackgroundCell(buffer.cursorAttr.BgColour))
+				line.cells = append(line.cells, Cell{})
 			}
 
 			cell := &line.cells[buffer.CursorColumn()]
 			cell.setRune(r)
 			cell.attr = buffer.cursorAttr
-
 		}
 
-		if inc {
-			buffer.incrementCursorPosition()
-		}
+		buffer.incrementCursorPosition()
 	}
 }
 
 func (buffer *Buffer) incrementCursorPosition() {
-
-	defer buffer.emitDisplayChange()
-
 	// we can increment one column past the end of the line.
 	// this is effectively the beginning of the next line, except when we \r etc.
-	if buffer.CursorColumn() < buffer.Width() { // if not at end of line
-
+	if buffer.CursorColumn() < buffer.Width() {
 		buffer.cursorX++
-
 	}
 }
 
@@ -708,7 +690,6 @@ func (buffer *Buffer) Backspace() {
 }
 
 func (buffer *Buffer) CarriageReturn() {
-	defer buffer.emitDisplayChange()
 
 	for {
 		line := buffer.getCurrentLine()
@@ -726,7 +707,6 @@ func (buffer *Buffer) CarriageReturn() {
 }
 
 func (buffer *Buffer) Tab() {
-	defer buffer.emitDisplayChange()
 	tabSize := 4
 	shift := int(buffer.cursorX-1) % tabSize
 	if shift == 0 {
@@ -738,7 +718,6 @@ func (buffer *Buffer) Tab() {
 }
 
 func (buffer *Buffer) NewLine() {
-	defer buffer.emitDisplayChange()
 
 	buffer.cursorX = 0
 	buffer.Index()