docs: add some comments

1 files changed, 6 insertions, 0 deletions

diff --git a/main.go b/main.go
index f663005..4cb3d0d 100644
--- a/main.go
+++ b/main.go
@@ -24,6 +24,8 @@ func main() {
 
 	flag.Parse()
 
+	// Vet the given CLI arguments for things like negative or
+	// missing values.
 	if *maxConcurrency == 0 {
 		log.Fatal("Missing -c argument")
 	}
@@ -44,6 +46,8 @@ func main() {
 		log.Fatalf("Invalid -depth argument: %d", *maxDepth)
 	}
 
+	// Add "https://" scheme prefix if missing. It looks like we
+	// have to do this before the parsing step, not after.
 	if !strings.HasPrefix(*startRawURL, "http://") && !strings.HasPrefix(*startRawURL, "https://") {
 		*startRawURL = "https://" + *startRawURL
 		fmt.Printf("start url: %s\n", *startRawURL)
@@ -54,6 +58,8 @@ func main() {
 		log.Fatal(err)
 	}
 
+	// Our web crawlers use concurrency: check if any goroutines
+	// have leaked.
 	getLeakProfile(func() {
 		classic(*startURL, *maxConcurrency, *maxURLs, *maxDepth)
 	})