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25 Command Loop

When you run SXEmacs, it enters the editor command loop almost immediately. This loop reads events, executes their definitions, and displays the results. In this chapter, we describe how these things are done, and the subroutines that allow Lisp programs to do them.

• Command Overview:  How the command loop reads commands.
• Defining Commands:  Specifying how a function should read arguments.
• Interactive Call:  Calling a command, so that it will read arguments.
• Command Loop Info:  Variables set by the command loop for you to examine.
• Events:  What input looks like when you read it.
• Reading Input:  How to read input events from the keyboard or mouse.
• Waiting:  Waiting for user input or elapsed time.
• Quitting:  How C-g works. How to catch or defer quitting.
• Prefix Command Arguments:  How the commands to set prefix args work.
• Recursive Editing:  Entering a recursive edit, and why you usually shouldn’t.
• Disabling Commands:  How the command loop handles disabled commands.
• Command History:  How the command history is set up, and how accessed.
• Keyboard Macros:  How keyboard macros are implemented.

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