The commands M-( (
insert-parentheses) and M-)
move-over-close-and-reindent) are designed to facilitate a style
of editing which keeps parentheses balanced at all times. M-(
inserts a pair of parentheses, either together as in `()', or, if
given an argument, around the next several sexps. It leaves point after
the open parenthesis. The command M-) moves past the close
parenthesis, deleting any indentation preceding it (in this example
there is none), and indenting with LFD after it.
For example, instead of typing ( F O O ), you can type M-( F O O, which has the same effect except for leaving the cursor before the close parenthesis.
M-( may insert a space before the open parenthesis, depending on
the syntax class of the preceding character. Set
parens-dont-require-spaces to a non-
nil value if you wish
to inhibit this.