move: empty files finder to root

17-project-empty-file-finder/02-write-to-a-file/main.go

@@ -0,0 +1,50 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+func main() {
+	args := os.Args[1:]
+	if len(args) == 0 {
+		fmt.Println("Provide a directory")
+		return
+	}
+
+	files, err := ioutil.ReadDir(args[0])
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	var names []byte
+
+	for _, file := range files {
+		if file.Size() == 0 {
+			name := file.Name()
+
+			names = append(names, name...)
+			names = append(names, '\n')
+		}
+	}
+
+	err = ioutil.WriteFile("out.txt", names, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("%s", names)
+}
+
+// See: https://www.tutorialspoint.com/unix/unix-file-permission.htm
+// See: http://permissions-calculator.org/