Use piece colors

main.go

@@ -35,18 +35,22 @@ func npos(l, c int, f tris.Field) {
 
 func lpos(l, c int, f tris.Field) {
 	pos(l, c)
-	var line []int
-	for _, r := range f {
-		if len(line) == 0 {
-			line = r
-		}
-		for i := range line {
-			if r[i] > 0 {
-				line[i] = 5
-			}
-		}
-	}
-	ppos(l, c, render(line, "\u2591\u2591", "  "))
+	ppos(l, c, render(where(f), "\u2591\u2591", "  "))
+}
+
+func where(f tris.Field) []int {
+        var line []int
+        for _, r := range f {
+                if len(line) == 0 {
+                        line = r
+                }
+                for i := range line {
+                        if r[i] > 0 {
+                                line[i] = r[i]
+                        }
+                }
+        }
+	return line
 }
 
 func render(r []int, block, empty string) string {