Скачать или смотреть Permanently Save a Macro in LISP (SBCL) for Future Use

Learn how to permanently save your LISP macros in SBCL, ensuring they're always available for your projects. This guide covers where to save your macros for easy loading.
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This video is based on the question https://stackoverflow.com/q/71370155/ asked by the user 'g0x0' ( https://stackoverflow.com/u/10209851/ ) and on the answer https://stackoverflow.com/a/71371821/ provided by the user 'Manfred' ( https://stackoverflow.com/u/5501880/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Permanently Save a Macro in LISP (SBCL)

If you're working with Common Lisp, especially using SBCL (Steel Bank Common Lisp), you might have encountered a situation where you define a macro and wish to reuse it across your projects. Imagine defining a useful macro like this:

[[See Video to Reveal this Text or Code Snippet]]

While defining a macro is quite straightforward, the challenge lies in making it available for future use in all your LISP files. This guide will guide you step-by-step on how to achieve this by properly configuring your SBCL environment.

The Importance of Saving Macros Permanently

When you're programming in LISP, macros can significantly enhance your code by allowing you to define new syntactic constructs. However, if you need to redefine these macros every time you start a new session, it can be tedious and time-consuming. By ensuring that your macros are permanently stored, you can streamline your workflow, improve productivity, and maintain consistency across your projects.

Where to Save Your Macros in SBCL

Every Common Lisp implementation has an initialization file that it reads each time it starts. For SBCL, this file is typically located at ~/.sbclrc. This file is a convenient place to include configurations or scripts that you want to be loaded automatically whenever you start SBCL.

Steps to Save Your Macro

Locate or Create the Initialization File:

Open your terminal and navigate to your home directory.

Check if .sbclrc exists. If it doesn't, create a new file called .sbclrc in your home directory.

Set Up Your Macro File:

Create a new file where you will save your macro. For example, macro-file.lisp:

[[See Video to Reveal this Text or Code Snippet]]

Save this file in a directory of your choice, ensuring you remember the path.

Modify .sbclrc:

Open your .sbclrc file in a text editor.

Add the following line, making sure to specify the correct path to your macro file:

[[See Video to Reveal this Text or Code Snippet]]

Replace path/to/your/macro/file.lisp with the actual path where your macro file is stored.

Example .sbclrc Configuration

Here’s how your .sbclrc file might look after adding the macro load command:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you'll be able to permanently save your LISP macros in SBCL and load them automatically every time you start your REPL. This not only saves time but also makes your development process much more efficient.

Feel free to comment if you have any questions or share your experiences with macros in Common LISP. Happy coding!