handle unusual escape codes in files

ui.go

@@ -111,12 +111,14 @@ func (win *Win) print(x, y int, fg, bg termbox.Attribute, s string) {
 	for i := 0; i < len(s); i++ {
 		r, w := utf8.DecodeRuneInString(s[i:])
 
-		if r == EscapeCode {
-			i++
-			if s[i] == '[' {
-				j := strings.IndexByte(s[i:], 'm')
+		if r == EscapeCode && i+1 < len(s) && s[i+1] == '[' {
+			j := strings.IndexByte(s[i:min(len(s), i+8)], 'm')
 
-				toks := strings.Split(s[i+1:i+j], ";")
+			if j == -1 {
+				continue
+			}
+
+			toks := strings.Split(s[i+2:i+j], ";")
 
 			var nums []int
 			for _, t := range toks {
@@ -185,10 +187,9 @@ func (win *Win) print(x, y int, fg, bg termbox.Attribute, s string) {
 				}
 			}
 
-				i = i + j
+			i += j
 			continue
 		}
-		}
 
 		if x >= win.w {
 			break