(emacs.info) Balanced Editing

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 Editing Without Unbalanced Parentheses
 ======================================
 
 `M-('
      Put parentheses around next sexp(s) (`insert-parentheses').
 
 `M-)'
      Move past next close parenthesis and reindent
      (`move-past-close-and-reindent').
 
    The commands `M-(' (`insert-parentheses') and `M-)'
 (`move-past-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, and indenting with `C-j' 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-require-spaces' to `nil' value if you wish to inhibit this.
 

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