Build Your Own Text Editor

“This is an instruction booklet that shows you how to build a text editor in C.

The text editor is antirez’s kilo, with some changes. It’s about 1000 lines of C in a single file with no dependencies, and it implements all the basic features you expect in a minimal editor, as well as syntax highlighting and a search feature.

This booklet walks you through building the editor in 184 steps. Each step, you’ll add, change, or remove a few lines of code. Most steps, you’ll be able to observe the changes you made by compiling and running the program immediately afterwards.”

Might be interesting to compare to the source code of mg, which is a minimal editor written in C that works like Emacs.