dont seg fault when there is no highlighting info

cfg/config.go

@@ -69,6 +69,7 @@ type RenderConfig struct {
 	Accelerated         bool
 	Throttle_Cpu_Usage  bool
 	Always_Render       bool
+	Syntax_Highlighting bool
 }
 
 // todo make this more extendable...

cfg/config_any.go

@@ -18,6 +18,7 @@ aliased = true
 accelerated = true
 throttle_cpu_usage = true
 always_render = true
+syntax_highlighting = true
 
 [file_associations]
 [file_associations.c]

cfg/config_linux.go

@@ -18,6 +18,7 @@ aliased = true
 accelerated = true
 throttle_cpu_usage = true
 always_render = true
+syntax_highlighting = true
 
 [file_associations]
 [file_associations.c]

cfg/config_mac.go

@@ -18,6 +18,7 @@ aliased = true
 accelerated = true
 throttle_cpu_usage = true
 always_render = true
+syntax_highlighting = true
 
 [file_associations]
 [file_associations.c]

gui/buffer.go

@@ -755,54 +755,7 @@ var ex, ey = 0, 0
 
 var compiledRegex = map[string]*regexp.Regexp{}
 
-func (b *Buffer) renderAt(ctx *strife.Renderer, rx int, ry int) {
-	// BACKGROUND
-	ctx.SetColor(strife.HexRGB(b.cfg.Theme.Background))
-	ctx.Rect(b.x, b.y, b.w, b.h, strife.Fill)
-
-	if b.cfg.Editor.Highlight_Line && b.HasFocus {
-		ctx.SetColor(strife.Black) // highlight_line_col?
-		ctx.Rect(ex+rx, ey+(ry+b.curs.ry*last_h)-(b.cam.y*last_h), b.w, last_h, strife.Fill)
-	}
-
-	// render the ol' cursor
-	if b.HasFocus && renderFlashingCursor && b.cfg.Cursor.Draw {
-		cursorWidth := b.cfg.Cursor.GetCaretWidth()
-		if cursorWidth == -1 {
-			cursorWidth = last_w
-		}
-
-		ctx.SetColor(strife.HexRGB(b.cfg.Theme.Cursor)) // caret colour
-		ctx.Rect(ex+(rx+b.curs.rx*last_w)-(b.cam.x*last_w), (ry+b.curs.ry*last_h)-(b.cam.y*last_h), cursorWidth, last_h, strife.Fill)
-	}
-
-	var visibleLines int = 50
-
-	// last_h > 0 means we have done
-	// a render.
-	if int(last_h) > 0 && int(b.h) != 0 {
-		// render an extra three lines just
-		// so we dont cut anything off if its
-		// not evenly divisible
-		visibleLines = (int(b.h) / int(last_h)) + 3
-	}
-
-	start := b.cam.y
-	upper := b.cam.y + visibleLines
-	if start > len(b.contents) {
-		start = len(b.contents)
-	}
-	if upper > len(b.contents) {
-		upper = len(b.contents)
-	}
-
-	numLines := len(b.contents)
-
-	var y_col int
-	for lineNum, rope := range b.contents[start:upper] {
-		currLine := []rune(rope.String())
-
-		// char index => colour
+func (b *Buffer) syntaxHighlightLine(currLine string) map[int]syntaxRuneInfo {
 	matches := map[int]syntaxRuneInfo{}
 
 	subjects := make([]cfg.SyntaxCriteria, len(b.languageInfo.Syntax))
@@ -871,6 +824,62 @@ func (b *Buffer) renderAt(ctx *strife.Renderer, rx int, ry int) {
 		}
 	}
 
+	return matches
+}
+
+func (b *Buffer) renderAt(ctx *strife.Renderer, rx int, ry int) {
+	// BACKGROUND
+	ctx.SetColor(strife.HexRGB(b.cfg.Theme.Background))
+	ctx.Rect(b.x, b.y, b.w, b.h, strife.Fill)
+
+	if b.cfg.Editor.Highlight_Line && b.HasFocus {
+		ctx.SetColor(strife.Black) // highlight_line_col?
+		ctx.Rect(ex+rx, ey+(ry+b.curs.ry*last_h)-(b.cam.y*last_h), b.w, last_h, strife.Fill)
+	}
+
+	// render the ol' cursor
+	if b.HasFocus && renderFlashingCursor && b.cfg.Cursor.Draw {
+		cursorWidth := b.cfg.Cursor.GetCaretWidth()
+		if cursorWidth == -1 {
+			cursorWidth = last_w
+		}
+
+		ctx.SetColor(strife.HexRGB(b.cfg.Theme.Cursor)) // caret colour
+		ctx.Rect(ex+(rx+b.curs.rx*last_w)-(b.cam.x*last_w), (ry+b.curs.ry*last_h)-(b.cam.y*last_h), cursorWidth, last_h, strife.Fill)
+	}
+
+	var visibleLines int = 50
+
+	// last_h > 0 means we have done
+	// a render.
+	if int(last_h) > 0 && int(b.h) != 0 {
+		// render an extra three lines just
+		// so we dont cut anything off if its
+		// not evenly divisible
+		visibleLines = (int(b.h) / int(last_h)) + 3
+	}
+
+	start := b.cam.y
+	upper := b.cam.y + visibleLines
+	if start > len(b.contents) {
+		start = len(b.contents)
+	}
+	if upper > len(b.contents) {
+		upper = len(b.contents)
+	}
+
+	numLines := len(b.contents)
+
+	var y_col int
+	for lineNum, rope := range b.contents[start:upper] {
+		currLine := []rune(rope.String())
+
+		// char index => colour
+		var matches map[int]syntaxRuneInfo
+		if b.languageInfo != nil {
+			matches = b.syntaxHighlightLine(string(currLine))
+		}
+
 		colorStack := []int{}
 
 		var x_col int