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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 Filling.
Auto Fill mode also enables the functions that change the margins and justification style to refill portions of the text. See Margins.
The value of this buffer-local 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.
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.
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.