rename all files in folder; split "_" the filename and remove the last part

rename_files.go

// go build rename_files.go
package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
)

func main() {
	// Check if the directory path is provided as an argument
	if len(os.Args) < 2 {
		fmt.Println("Usage: go run rename_files.go <directory-path>")
		return
	}

	// Get the directory path from the command-line argument
	dir := os.Args[1]

	// Open the directory
	files, err := os.ReadDir(dir)
	if err != nil {
		fmt.Println("Error reading directory:", err)
		return
	}

	// Iterate over the files in the directory
	for _, file := range files {
		if file.IsDir() {
			continue // Skip directories
		}

		oldName := file.Name()
		ext := filepath.Ext(oldName) // Get the file extension
		base := strings.TrimSuffix(oldName, ext) // Get the base name without the extension

		parts := strings.Split(base, "_") // Split the base name by "_"
		if len(parts) > 1 {
			newBase := strings.Join(parts[:len(parts)-1], "_") // Join all parts except the last one
			newName := newBase + ext // Construct the new file name with the extension

			oldPath := filepath.Join(dir, oldName)
			newPath := filepath.Join(dir, newName)

			// Rename the file
			err := os.Rename(oldPath, newPath)
			if err != nil {
				fmt.Println("Error renaming file:", err)
			} else {
				fmt.Printf("Renamed: %s -> %s\n", oldName, newName)
			}
		}
	}
}