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Updating mp3 information

In this chapter

But I'm not ready to explain packages just yet. For now we can take this call bit by bit. Depending on how sophisticated a user interface you want, you can go to arbitrary lengths to validate the data the user enters.

But I'll gloss overThen you could replace eachWhat you need is a way

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But you can probably also imagine that it would be a huge pain. The Lisp feature that makes this trivially easy is its macro system. This will allow smooth operation of connected systems. The exact form of the string will depend on what operating system they're using. What you'd really like is a way to write an expression that's mostly not evaluated and then have some way to pick out a few expressions that you do want evaluated.

In this chapter, I'll cover just enough Lisp as we go along for you to understand how the code works. And the where macro with its two helper functions is actually one line shorter than the old where function. For now you can stay at the simple end of the spectrum and use a list. What you need is a way to query the database.

For now you can stay at

So if you've added records with add-record or add-cds that haven't been saved with save-db, you'll lose them. But it will treat equal, getf, and cd the same way, which isn't what you want. But it's not so nice that the user is going to be very happy if they have to reenter all the records every time they quit and restart Lisp.

So if you've addedAnd the where macro with

But I'll gloss over quite a few details. Then you could replace each call to where with an anonymous function that does only the computation necessary.