feat: remove URL flag, use arg instead

- Removes the URL flag in favor of a single URL command. The URL option was never really an option as it was the only required argument. Passing the URL in as an argument feels more natural to use.
- Updates main_test.go to use args.
- Update usage to reflect API changes.

cmd/creep/main_test.go

@@ -86,31 +86,31 @@ func TestCreepCLI(t *testing.T) {
 	})
 
 	t.Run("DownloadSingleImage", func(t *testing.T) {
-		args := "-u https://source.unsplash.com/random"
+		args := "https://source.unsplash.com/random"
 		cmd := exec.Command(cmdPath, strings.Split(args, " ")...)
 		if err := cmd.Run(); err != nil {
 			t.Fatal(err)
 		}
 	})
 
 	t.Run("DownloadMultipleImages", func(t *testing.T) {
-		args := "-u https://source.unsplash.com/random -c 2"
+		args := "https://source.unsplash.com/random -c 2"
 		cmd := exec.Command(cmdPath, strings.Split(args, " ")...)
 		if err := cmd.Run(); err != nil {
 			t.Fatal(err)
 		}
 	})
 
 	t.Run("DownloadSingleImageWithName", func(t *testing.T) {
-		args := "-u https://source.unsplash.com/random -n test"
+		args := "https://source.unsplash.com/random -n test"
 		cmd := exec.Command(cmdPath, strings.Split(args, " ")...)
 		if err := cmd.Run(); err != nil {
 			t.Fatal(err)
 		}
 	})
 
-	t.Run("DownloadSingleImageWithOutpath", func(t *testing.T) {
-		args := "-u https://source.unsplash.com/random -o test"
+	t.Run("DownloadSingleImageWithPath", func(t *testing.T) {
+		args := "https://source.unsplash.com/random -o test"
 		cmd := exec.Command(cmdPath, strings.Split(args, " ")...)
 		if err := cmd.Run(); err != nil {
 			t.Fatal(err)
@@ -122,7 +122,7 @@ func TestCreepCLI(t *testing.T) {
 	})
 
 	t.Run("DownloadMultipleImagesWithThrottle", func(t *testing.T) {
-		args := "-u https://source.unsplash.com/random -c 2 -t 4"
+		args := "https://source.unsplash.com/random -c 2 -t 4"
 		cmd := exec.Command(cmdPath, strings.Split(args, " ")...)
 		if err := cmd.Run(); err != nil {
 			t.Fatal(err)

pkg/flags/flags.go

@@ -24,8 +24,6 @@ type Config struct {
 func HandleFlags() (c *Config, err error) {
 	c = &Config{}
 	v := false
-	flag.StringVar(&c.URL, "url", "", "")
-	flag.StringVar(&c.URL, "u", "", "")
 	flag.StringVar(&c.Name, "name", "creep", "")
 	flag.StringVar(&c.Name, "n", "creep", "")
 	flag.UintVar(&c.Count, "count", 1, "")
@@ -38,6 +36,7 @@ func HandleFlags() (c *Config, err error) {
 	flag.BoolVar(&v, "v", false, "")
 	flag.Usage = generateUsage()
 	flag.Parse()
+	c.URL = flag.Arg(0)
 
 	if v {
 		fmt.Println(Version)
@@ -71,10 +70,12 @@ func generateUsage() func() {
 Downloads an image from the given URL a given number of times to the specified directory.
 
 Usage:
-  creep [FLAGS] [OPTIONS]
+  creep [URL] [FLAGS] [OPTIONS]
+
+URL:
+  The URL of the resource to access (required)
 
 Options:
-  -u, --url string        The URL of the resource to access (required)
   -c, --count int         The number of times to access the resource (defaults to 1)
   -n, --name string       The base filename to use as output (defaults to "creep")
   -o, --out string        The output directory path (defaults to current directory)
@@ -85,8 +86,8 @@ Flags:
   -v, --version           Prints version information
 
 Example usage:
-  creep -u https://thispersondoesnotexist.com/image -c 32
-	creep --url=https://source.unsplash.com/random --name=random --out=downloads --count=64 --throttle=3`)
+  creep https://thispersondoesnotexist.com/image -c 32
+  creep https://source.unsplash.com/random --name=random --out=downloads --count=64 --throttle=3`)
 		fmt.Println()
 		os.Exit(0)
 	}