Support `prog-fill-reindent-defun` From Emacs 30

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Unlocking the Power of prog-fill-reindent-defun in Emacs 30

As an Emacs user, you're likely no stranger to the power of customization and extension. With the release of Emacs 30.1, a new set of features has been introduced, including prog-fill-reindent-defun. This feature has the potential to revolutionize the way you work with code in Emacs, but it's not yet supported by the popular unfill package. In this article, we'll explore the possibilities of prog-fill-reindent-defun and how you can use it to take your Emacs experience to the next level.

What is prog-fill-reindent-defun?

prog-fill-reindent-defun is a new feature in Emacs 30.1 that allows you to fill and reindent code in a programmatic way. This feature is designed to work seamlessly with Emacs's built-in prog-mode, which is used for editing code in various programming languages. With prog-fill-reindent-defun, you can easily fill and reindent your code, making it easier to read and understand.

How does prog-fill-reindent-defun work?

prog-fill-reindent-defun works by analyzing the code in your buffer and automatically filling and reindenting it. This feature is designed to work with a variety of programming languages, including C, C++, Java, and many others. When you enable prog-fill-reindent-defun, Emacs will automatically fill and reindent your code as you type, making it easier to write and maintain.

Why is prog-fill-reindent-defun not supported by unfill?

The unfill package is a popular extension for Emacs that allows you to easily toggle filling in your buffers. However, unfill does not currently support prog-fill-reindent-defun. This is because unfill is designed to work with a specific set of features, and prog-fill-reindent-defun is a relatively new feature that is not yet supported.

How can you use prog-fill-reindent-defun with unfill?

While unfill does not currently support prog-fill-reindent-defun, there are still ways to use this feature with unfill. One possible solution is to create a custom function that combines the functionality of unfill and prog-fill-reindent-defun. This function could toggle filling in your buffers while also enabling prog-fill-reindent-defun.

Creating a custom function to combine unfill and prog-fill-reindent-defun

To create a custom function that combines the functionality of unfill and prog-fill-reindent-defun, you'll need to use Emacs's Lisp programming language. Here's an example of how you can create such a function:

(defun my-toggle-fill-and-reindent ()
  "Toggle filling and reindentation in the current buffer."
  (interactive)
  (if (not (eq major-mode 'prog-mode))
      (error "This function only works in prog-mode"))
  (if (not (eq fill-column (point-max)))
      (fill-paragraph))
  (prog-fill-reindent-defun))

This function, my-toggle-fill-and-reindent, checks if the current buffer is in prog-mode and if the fill column is not at the end of the buffer. If both conditions are met, it toggles filling and reindentation using fill-paragraph and prog-fill-reindent-defun.

Using the custom function

To use the custom function, simply call it in your Emacs buffer. You can do this by pressing M-x my-toggle-fill-and-reindent or by adding a keybinding to your Emacs configuration file.

Conclusion

prog-fill-reindent-defun is a powerful feature in Emacs 30.1 that allows you to fill and reindent code in a programmatic way. While it's not currently supported by the unfill package, you can still use this feature with a custom function. By creating a custom function that combines the functionality of unfill and prog-fill-reindent-defun, you can take your Emacs experience to the next level and make coding easier and more efficient.

Future Development

The unfill package is constantly evolving, and it's possible that support for prog-fill-reindent-defun will be added in the future. If you're interested in seeing this feature added, be sure to submit a feature request to the unfill package maintainers.

Additional Resources

For more information on prog-fill-reindent-defun and how to use it, be sure to check out the Emacs documentation. You can also search online for tutorials and guides on how to use this feature.

Common Questions

  • Q: What is prog-fill-reindent-defun? A: prog-fill-reindent-defun is a feature in Emacs 30.1 that allows you to fill and reindent code in a programmatic way.
  • Q: Why is prog-fill-reindent-defun not supported by unfill? A: unfill does not currently support prog-fill-reindent-defun because it is a relatively new feature that is not yet supported.
  • Q: How can I use prog-fill-reindent-defun with unfill? A: You can create a custom function that combines the functionality of unfill and prog-fill-reindent-defun.
    Frequently Asked Questions: prog-fill-reindent-defun and unfill

As you explore the possibilities of prog-fill-reindent-defun and unfill, you may have questions about how to use these features together. In this article, we'll answer some of the most frequently asked questions about prog-fill-reindent-defun and unfill.

Q: What is prog-fill-reindent-defun?

A: prog-fill-reindent-defun is a feature in Emacs 30.1 that allows you to fill and reindent code in a programmatic way. This feature is designed to work seamlessly with Emacs's built-in prog-mode, which is used for editing code in various programming languages.

Q: Why is prog-fill-reindent-defun not supported by unfill?

A: unfill does not currently support prog-fill-reindent-defun because it is a relatively new feature that is not yet supported. However, you can create a custom function that combines the functionality of unfill and prog-fill-reindent-defun.

Q: How can I use prog-fill-reindent-defun with unfill?

A: You can create a custom function that combines the functionality of unfill and prog-fill-reindent-defun. This function can toggle filling and reindentation in your buffers while also enabling prog-fill-reindent-defun.

Q: What is the difference between fill-paragraph and prog-fill-reindent-defun?

A: fill-paragraph is a built-in Emacs function that fills a paragraph of text to a specified width. prog-fill-reindent-defun, on the other hand, is a feature that fills and reindents code in a programmatic way. While fill-paragraph can be used to fill code, it does not reindent it.

Q: Can I use prog-fill-reindent-defun with other programming languages?

A: Yes, prog-fill-reindent-defun is designed to work with a variety of programming languages, including C, C++, Java, and many others.

Q: How do I enable prog-fill-reindent-defun in my Emacs configuration file?

A: To enable prog-fill-reindent-defun in your Emacs configuration file, you can add the following line to your .emacs file:

(add-hook 'prog-mode-hook 'prog-fill-reindent-defun)

This will enable prog-fill-reindent-defun for all buffers in prog-mode.

Q: Can I customize the behavior of prog-fill-reindent-defun?

A: Yes, you can customize the behavior of prog-fill-reindent-defun by modifying the prog-fill-reindent-defun function itself. You can also use Emacs's built-in customization system to customize the behavior of prog-fill-reindent-defun.

Q: What are some common use cases for prog-fill-reindent-defun?

A: Some common use cases for prog-fill-reindent-defun include:

  • Filling and reindenting code in a programmatic way
  • Automatically reindenting code as you type
  • Creating a consistent coding style across multiple files
  • Making it easier to read and understand code

Q: Can I use prog-fill-reindent-defun with other Emacs packages?

A: Yes, prog-fill-reindent-defun can be used with other Emacs packages, including unfill, fill-paragraph, and many others.

Q: How do I report bugs or request features for prog-fill-reindent-defun?

A: To report bugs or request features for prog-fill-reindent-defun, you can submit a bug report or feature request to the Emacs bug tracker or the unfill package maintainers.

Q: Can I use prog-fill-reindent-defun with non-English languages?

A: Yes, prog-fill-reindent-defun can be used with non-English languages. However, you may need to customize the behavior of prog-fill-reindent-defun to accommodate the specific language and character set you are using.

Q: How do I get started with using prog-fill-reindent-defun?

A: To get started with using prog-fill-reindent-defun, you can follow these steps:

  1. Install Emacs 30.1 or later.
  2. Enable prog-fill-reindent-defun in your Emacs configuration file.
  3. Create a custom function that combines the functionality of unfill and prog-fill-reindent-defun.
  4. Use the custom function to toggle filling and reindentation in your buffers.

By following these steps, you can start using prog-fill-reindent-defun and take your Emacs experience to the next level.