Preface

Programmers shape ideas into text.

That text gets turned into numbers and those numbers bump into other numbers and make things happen.

As programmers, we use text editors to get our ideas out of our heads and create the chunks of text we call "programs". Full-time programmers will spend tens of thousands of hours of their lives interacting with their text editor, during which they'll be doing many things:

• Getting raw text from their brains into their computers.
• Correcting mistakes in that text.
• Restructuring the text to formulate a problem in a different way.
• Documenting how and why something was done a particular way.
• Communicating with other programmers about all of these things.

Vim is incredibly powerful out of the box, but it doesn't truly shine until you take some time to customize it for your particular work, habits, and fingers. This book will introduce you to Vimscript, the main programming language used to customize Vim. You'll be able to mold Vim into an editor suited to your own personal text editing needs and make the rest of your time in Vim more efficient.

Along the way I'll also mention things that aren't strictly about Vimscript, but are more about learning and being more efficient in general. Vimscript isn't going to help you much if you wind up fiddling with your editor all day instead of working, so it's important to strike a balance.

The style of this book is a bit different from most other books about programming languages. Instead of simply presenting you with facts about how Vimscript works, it guides you through typing in commands to see what they do.

Sometimes the book will lead you into dead ends before explaining the "right way" to solve a problem. Most other books don't do this, or only mention the sticky issues after showing you the solution. This isn't how things typically happen in the real world, though. Often you'll be writing a quick piece of Vimscript and run into a quirk of the language that you'll need to figure out. By stepping through this process in the book instead of glossing over it I hope to get you used to dealing with Vimscript's peculiarities so you're ready when you find edge cases of your own. Practice makes perfect.

Each chapter of the book focuses on a single topic. They're short but packed with information, so don't just skim them. If you really want to get the most out of this book you need to actually type in all of the commands. You may already be an experienced programmer who's used to reading code and understanding it straight away. If so: it doesn't matter. Learning Vim and Vimscript is a different experience from learning a normal programming language.

You need to type in all the commands.

You need to do all the exercises.

There are two reasons this is so important. First, Vimscript is old and has a lot of dusty corners and twisty hallways. One configuration option can change how the entire language works. By typing every command in every lesson and doing every exercise you'll discover problems with your Vim build or configuration on the simpler commands, where they'll be easier to diagnose and fix.

Second, Vimscript is Vim. To save a file in Vim, you type :write (or :w for short) and press return. To save a file in a Vimscript, you use write. Many of the Vimscript commands you'll learn can be used in your day-to-day editing as well, but they're only helpful if they're in your muscle memory, which simply doesn't happen from just reading.

I hope you'll find this book useful. It's not meant to be a comprehensive guide to Vimscript. It's meant to get you comfortable enough with the language to mold Vim to your taste, write some simple plugins for other users, read other people's code (with regular side-trips to :help), and recognize some of the common pitfalls.

Good luck!