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(elisp)Adaptive Fill

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Adaptive Fill Mode
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   Adaptive Fill mode chooses a fill prefix automatically from the text
in each paragraph being filled.

 - User Option: adaptive-fill-mode
     Adaptive Fill mode is enabled when this variable is non-`nil'.  It
     is `t' by default.

 - Function: fill-context-prefix from to
     This function implements the heart of Adaptive Fill mode; it
     chooses a fill prefix based on the text between FROM and TO.  It
     does this by looking at the first two lines of the paragraph,
     based on the variables described below.

 - User Option: adaptive-fill-regexp
     This variable holds a regular expression to control Adaptive Fill
     mode.  Adaptive Fill mode matches this regular expression against
     the text starting after the left margin whitespace (if any) on a
     line; the characters it matches are that line's candidate for the
     fill prefix.

 - User Option: adaptive-fill-first-line-regexp
     In a one-line paragraph, if the candidate fill prefix matches this
     regular expression, or if it matches `comment-start-skip', then it
     is used--otherwise, spaces amounting to the same width are used
     instead.

     However, the fill prefix is never taken from a one-line paragraph
     if it would act as a paragraph starter on subsequent lines.

 - User Option: adaptive-fill-function
     You can specify more complex ways of choosing a fill prefix
     automatically by setting this variable to a function.  The
     function is called when `adaptive-fill-regexp' does not match,
     with point after the left margin of a line, and it should return
     the appropriate fill prefix based on that line.  If it returns
     `nil', that means it sees no fill prefix in that line.