all: Run modernize -fix ./...

canvas.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"io"
+	"slices"
 	"sort"
 )
 
@@ -31,12 +32,7 @@ var reservedRunes = map[rune]bool{
 }
 
 func contains(in []rune, r rune) bool {
-	for _, v := range in {
-		if r == v {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(in, r)
 }
 
 func isJoint(r rune) bool {

examples_test.go

@@ -19,7 +19,7 @@ func TestExamplesStableOutput(t *testing.T) {
 	c := qt.New(t)
 
 	var previous string
-	for i := 0; i < 3; i++ {
+	for i := range 3 {
 		in, err := os.Open(filepath.Join(basePath, "circuits.txt"))
 		if err != nil {
 			t.Fatal(err)

iter.go

@@ -6,8 +6,8 @@ func upDown(width int, height int) chan Index {
 	c := make(chan Index, width*height)
 
 	go func() {
-		for w := 0; w < width; w++ {
-			for h := 0; h < height; h++ {
+		for w := range width {
+			for h := range height {
 				c <- Index{w, h}
 			}
 		}
@@ -40,8 +40,8 @@ func diagDown(width int, height int) chan Index {
 		maxSum := width
 
 		for sum := minSum; sum <= maxSum; sum++ {
-			for w := 0; w < width; w++ {
-				for h := 0; h < height; h++ {
+			for w := range width {
+				for h := range height {
 					if w-h == sum {
 						c <- Index{w, h}
 					}
@@ -61,8 +61,8 @@ func diagUp(width int, height int) chan Index {
 		maxSum := width + height - 2
 
 		for sum := 0; sum <= maxSum; sum++ {
-			for w := 0; w < width; w++ {
-				for h := 0; h < height; h++ {
+			for w := range width {
+				for h := range height {
 					if h+w == sum {
 						c <- Index{w, h}
 					}

svg.go

@@ -50,7 +50,7 @@ func BuildAndWriteSVG(src io.Reader, dst io.Writer) {
 	writeBytes(dst, "</svg>\n")
 }
 
-func writeBytes(out io.Writer, format string, args ...interface{}) {
+func writeBytes(out io.Writer, format string, args ...any) {
 	bytesOut := fmt.Sprintf(format, args...)
 
 	_, err := out.Write([]byte(bytesOut))