Read parameter from CLI and list files.

See
*
f72131f1be

main.go

@@ -1,7 +1,44 @@
 package main
 
-import "fmt"
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func walk(rootDir string) {
+	err := filepath.Walk(rootDir,
+		func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+
+			dir, file := filepath.Split(path)
+			ext := filepath.Ext(file)
+
+			if ext == ".md" {
+				fmt.Println(dir, file, ext, info.Size())
+			}
+
+			return nil
+		})
+	if err != nil {
+		log.Println(err)
+	}
+}
 
 func main() {
-	fmt.Println("Hi, I'm Jack!")
+
+	var rootDir string
+
+	flag.StringVar(&rootDir, "d", "directory", "Specify the directory to parse.")
+	flag.Usage = func() {
+		fmt.Printf("Jack expects: \n")
+		fmt.Printf("./jack -d <rootDir>\n")
+	}
+	flag.Parse()
+
+	walk(rootDir)
 }

main_test.go

@@ -0,0 +1,12 @@
+package main
+
+import "testing"
+
+func TestSayHi(t *testing.T) {
+	expected := "Hi, I'm Jack"
+	greeting := sayHi()
+
+	if greeting != expected {
+		t.Errorf("Greeting was incorrect, got: '%s', want: '%s'", greeting, expected)
+	}
+}