Trims leading space, or it gets into a loop where every time it runs …

…an additional space is added

Signed-off-by: Daniel Mikusa <[email protected]>

carton/buildpack_dependency.go

@@ -72,8 +72,8 @@ func (b BuildpackDependency) Update(options ...Option) {
 	// save any leading comments, this is to preserve license headers
 	// inline comments will be lost
 	comments := []byte{}
-	for _, line := range bytes.SplitAfter(c, []byte("\n")) {
-		if bytes.HasPrefix(line, []byte("#")) || len(bytes.TrimSpace(line)) == 0 {
+	for i, line := range bytes.SplitAfter(c, []byte("\n")) {
+		if bytes.HasPrefix(line, []byte("#")) || (i > 0 && len(bytes.TrimSpace(line)) == 0) {
 			comments = append(comments, line...)
 		} else {
 			break // stop on first comment

carton/package_dependency.go

@@ -148,8 +148,8 @@ func updateFile(cfgPath string, f func(md map[string]interface{})) error {
 	// save any leading comments, this is to preserve license headers
 	// inline comments will be lost
 	comments := []byte{}
-	for _, line := range bytes.SplitAfter(c, []byte("\n")) {
-		if bytes.HasPrefix(line, []byte("#")) || len(bytes.TrimSpace(line)) == 0 {
+	for i, line := range bytes.SplitAfter(c, []byte("\n")) {
+		if bytes.HasPrefix(line, []byte("#")) || (i > 0 && len(bytes.TrimSpace(line)) == 0) {
 			comments = append(comments, line...)
 		} else {
 			break // stop on first comment

carton/package_dependency_test.go

@@ -110,7 +110,8 @@ include-files = [
 	})
 
 	it("updates paketo-buildpacks dependency id partial id", func() {
-		Expect(ioutil.WriteFile(path, []byte(`[[order]]
+		Expect(ioutil.WriteFile(path, []byte(`
+[[order]]
 group = [
 	{ id = "paketo-buildpacks/test-1", version="test-version-1" },
 	{ id = "paketo-buildpacks/test-2", version="test-version-2" },