Add verbose option

examples/markdown.feature

@@ -41,3 +41,19 @@ Feature: Markdown
     When I run `linkcheck foo.md`
     Then the exit status should be 1
     And the stderr should contain "ERROR"
+
+  Scenario: Check a markdown file which contains a live link in verbose mode
+    Given a file named "foo.md" with:
+    """
+    [Google](https://google.com)
+    """
+    When I successfully run `linkcheck -v foo.md`
+    Then the stderr should contain "OK"
+
+  Scenario: Check a markdown file which contains a live link in verbose mode with a long option
+    Given a file named "foo.md" with:
+    """
+    [Google](https://google.com)
+    """
+    When I successfully run `linkcheck --verbose foo.md`
+    Then the stderr should contain "OK"

main.go

@@ -44,6 +44,8 @@ func main() {
 		if _, err := http.Get(s); err != nil {
 			printToStderr(color.New(color.FgRed).SprintFunc()("ERROR") + "\t" + colored + "\t" + err.Error())
 			ok = false
+		} else if err == nil && args["--verbose"].(bool) {
+			printToStderr(color.New(color.FgGreen).SprintFunc()("OK") + "\t" + colored)
 		}
 	}
 
@@ -88,7 +90,10 @@ func getArgs() map[string]interface{} {
 	usage := `Link checker for Markdown and HTML
 
 Usage:
-	linkcheck <filename>`
+	linkcheck [-v] <filename>
+
+Options:
+	-v, --verbose  Be verbose`
 
 	args, err := docopt.Parse(usage, nil, true, "linkcheck", true)