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Fortran mode has specialized support for Auto Fill mode, which
is a minor mode that automatically splits statements as you
insert them when they become too wide. Splitting a statement
involves making continuation lines using
fortran-continuation-string (see ForIndent Cont). This
splitting happens when you type SPC,
RET, or TAB, and also
in the Fortran indentation commands. You activate Auto Fill in
Fortran mode in the normal way. See Auto Fill.
Auto Fill breaks lines at spaces or delimiters when the lines
get longer than the desired width (the value of
fill-column). The delimiters (besides whitespace)
that Auto Fill can break at are ‘+’,
‘-’, ‘/’,
‘*’, ‘=’,
‘<’, ‘>’,
and ‘,’. The line break comes after the
delimiter if the variable
fortran-break-before-delimiters is nil.
Otherwise (and by default), the break comes before the
delimiter.
To enable Auto Fill in all Fortran buffers, add
auto-fill-mode to fortran-mode-hook.
See Hooks.