add: implemented the executable tool for prereqs

Author: michele-sciabarra

tools/executable.go

@@ -0,0 +1,48 @@
+package tools
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func Executable() (int, error) {
+	args := os.Args[1:]
+	if len(args) != 1 {
+		fmt.Println("Make a file executable:")
+		fmt.Println(" chmod +x in Unix, rename to .exe in Windows")
+		fmt.Println("Usage: executable <file>")
+		return 0, nil
+	}
+
+	file := args[0]
+
+	// Get the current file permissions
+	info, err := os.Stat(file)
+	if err != nil {
+		return 1, err
+	}
+
+	// Add execute permissions for the owner
+	if GetOS() == "windows" {
+		if !strings.HasSuffix(strings.ToLower(file), ".exe") {
+			fileexe := file + ".exe"
+			err = os.Rename(file, fileexe)
+			if err != nil {
+				return 1, err
+			}
+			fmt.Printf("Successfully renamed %s to %s\n", file, fileexe)
+			return 0, nil
+		} else {
+			fmt.Println("Nothing to do")
+			return 0, nil
+		}
+	} else {
+		err = os.Chmod(file, info.Mode()|0100)
+		if err != nil {
+			return 1, err
+		}
+		fmt.Printf("Successfully added execute permissions to %s\n", file)
+		return 0, nil
+	}
+}