GNU Emacs Manual - Program Indent

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## Indentation for Programs

The best way to keep a program properly indented is to use Emacs to reindent it as you change it. Emacs has commands to indent properly either a single line, a specified number of lines, or all of the lines inside a single parenthetical grouping.

Emacs also provides a Lisp pretty-printer in the library `pp`. This program reformats a Lisp object with indentation chosen to look nice.

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