REN.sh

Renames bad file extensions, Converts images, Creates PDFs, Compresses folders

A companion script for KDE connect.

Purpose

I transfer a lot of files between my devices.
When I transfer files from my phone to my computer, some files do not have proper extensions.
Just running REN [/path/to/directory] (If no path is specified, it runs in the present working directory) will fix all files with wrong extensions in that directory.

Currently, this script can properly rename the following file/mime types:

        File type                  ->    Extension
        
  	1. WEBP (image/webp)         ->    .webp
  	2. PNG (image/png)           ->    .png
  	3. JPEG (image/jpeg)         ->    .jpg
  	4. HEIC (image/heic)         ->    .heic
  	5. MP4 (video/mp4)           ->    .mp4
  	6. MKV (video/x-matroska)    ->    .mkv
  	7. MOV (video/quicktime)     ->    .mov
  	8. MP3 (audio/mpeg)          ->    .mp3
  	9. DOCX (* WORD DOCUMENT)    ->    .docx
  	10. PDF (application/pdf)    ->    .pdf
  	
  * mime type of word documents: application/vnd.openxmlformats-officedocument.wordprocessingml.document

Support for more formats is underway. But these are the most commonly used file types.
A file named foo.bar.ext.png which is of file type image/jpeg will be renamed to foo.bar.ext.jpg.
Originally, this script just renamed files to their proper extensions. But a few more functionalities were added.
Additional functionalities include:
- I added colors!!
- If the name of the current folder is foo, REN -x converts all 'png' and 'webp' files into 'jpg' files (Using ImageMagick - convert), and places all files in the current directory in a new folder in current directory with the name foo.zipper (other files will be copied as they are).
- REN -xpdf will create a PDF file from all the images in the folder foo.zipper and promptly removes the folder foo.zipper
- REN -xzip will create a PASSWORD-PROTECTED ZIP file (Using zip -re) from the folder foo.zipper (in the parent directory alongside the current directory - foo), and promptly removes the folder foo.zipper.
- Both -xpdf and -xzip are extensions of REN -x. Currently, all three options - -x, -xpdf, -xzip only run in the current directory - path to a directory cannot be specified with these three options.
  
  I regularly use REN -xzip to transfer archives to my iPad and REN -xpdf to transfer images to Android devices.
- REN -l [/path/to/folder] (works on current directory if no path is specified) will list all files in the specified path and their corresponding file/mime types. Useful for analysis & debugging.
- REN -h or REN --help will display help info and exit.

How to use it?

Install:

There is a make file in this directory. Use the following command to install this app.

$ sudo make install

Dependencies:

file
zip
convert (ImageMagick)

The Makefile will check if all dependencies are satisfied.

Uninstall:

Again, use the same make file to uninstall (Recommended):

$ sudo make remove

Alternatively, run this command (Not Recommended):

$ sudo rm /usr/bin/REN

Display Help:

Just use REN -h or REN --help to see help info.

Rename files to their proper extensions:

REN [/path/to/directory] will rename all files to their proper extensions.
For example, if $file is set to example.jpg.txt, and it is a PNG file, then ${file##.} will remove the longest match of *. from the beginning of the string. The file will be renamed to example.jpg.png. If you want, you can change this to ${file#.} - to rename example.jpg.txt as example.png (line 115, 116 in REN.sh)

List mime types of all files in a directory:

REN -l [/path/to/directory] will list all files and their corresponding mime types.
Under the hood, it uses the following command to determine the file/mime type:

$ file -b --mime-type "$file"

Convert PNG and WEBP files to JPGs:

REN -x creates a folder ${PWD}.zipper (where $PWD is present working directory) alongside the current directory.

Convert a folder full of images (PNG, WEBP and JPG) into PDF:

REN -xpdf will create a folder named 'PDF' alongside the current working directory.

Convert a folder into a Password-protected zip file:

Ren -xzip will create a zip file alongside the current working directory. You will be prompted to enter (and verify) your password in the terminal.

Copyright Notices:

Use REN -c to view copyright notice.

Licensing

I don't care what you do with this.
But it would be kewl if you mention me.
Check the LICENSE file.

Contribution

Do let me know if there is some edge case(s).
Any forks and merge requests are accepted.

Authored by: @_devlinman

P.S.

Tip to find mime types easily:

alias mime="file -b --mime-type"

Use JetBrains Mono!

=> ~~>

devlinman / REN.sh