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(elisp)Auto Filling

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Auto Filling
============

   Auto Fill mode is a minor mode that fills lines automatically as text
is inserted.  This section describes the hook used by Auto Fill mode.
For a description of functions that you can call explicitly to fill and
justify existing text, see Note: Filling.

   Auto Fill mode also enables the functions that change the margins and
justification style to refill portions of the text.  Note: Margins.

 - Variable: auto-fill-function
     The value of this variable should be a function (of no arguments)
     to be called after self-inserting a character from the table
     `auto-fill-chars'.  It may be `nil', in which case nothing special
     is done in that case.

     The value of `auto-fill-function' is `do-auto-fill' when Auto-Fill
     mode is enabled.  That is a function whose sole purpose is to
     implement the usual strategy for breaking a line.

          In older Emacs versions, this variable was named
          `auto-fill-hook', but since it is not called with the
          standard convention for hooks, it was renamed to
          `auto-fill-function' in version 19.

 - Variable: normal-auto-fill-function
     This variable specifies the function to use for
     `auto-fill-function', if and when Auto Fill is turned on.  Major
     modes can set buffer-local values for this variable to alter how
     Auto Fill works.

 - Variable: auto-fill-chars
     A char table of characters which invoke `auto-fill-function' when
     self-inserted--space and newline in most language environments.
     They have an entry `t' in the table.