Support for extension filter

Changes 💡

• Extension filter support added
• Now command line arguments are managed using the "flag" library

Quick usage guide 📚

Arguments:

  -d=string
        [REQUIRED] Full directory path to rename all files
  -e=string
        [OPTIONAL] Filter files containing the extension
  -p=string
        [OPTIONAL] Pattern to apply in the file renaming process (default "file-")

---

Basic usage example:

./mfr -d=/home/you/test/

• Before:

/home/you/test/
├── text.txt
├── image.png
├── document.pdf
└── program.java

• After:

/home/you/test/
├── file-1.txt
├── file-2.png
├── file-3.pdf
└── file-4.java

---

Example of pattern customization and extension filter:

./mfr -d=/home/you/test/ -p=photo -e=.png

• Before:

/home/you/test/
├── text.txt
├── image.png
├── other-image.png
├── document.pdf
└── program.java

• After:

/home/you/test/
├── text.txt
├── photo-1.png
├── photo-2.png
├── document.pdf
└── program.java

Future plans 📌

• Write more tests
• Allow customized sorting
• Create a backup of the renamed files
• Ask for confirmation in important directories