Fortran Auto Fill mode is a minor mode which automatically splits
Fortran statements as you insert them when they become too wide.
Splitting a statement involves making continuation lines using
fortran-continuation-string (See section Continuation Lines). This
splitting happens when you type SPC, RET, or TAB, and
also in the Fortran indentation commands.
M-x fortran-auto-fill-mode turns Fortran Auto Fill mode on if it was off, or off if it was on. This command works the same as M-x auto-fill-mode does for normal Auto Fill mode (see section Filling Text). A positive numeric argument turns Fortran Auto Fill mode on, and a negative argument turns it off. You can see when Fortran Auto Fill mode is in effect by the presence of the word `Fill' in the mode line, inside the parentheses. Fortran Auto Fill mode is a minor mode, turned on or off for each buffer individually. See section Minor Modes.
Fortran Auto Fill mode breaks lines at spaces or delimiters when the
lines get longer than the desired width (the value of
The delimiters that Fortran Auto Fill mode may break at are `,',
`'', `+', `-', `/', `*', `=', and `)'.
The line break comes after the delimiter if the variable
nil. Otherwise (and by
default), the break comes before the delimiter.
By default, Fortran Auto Fill mode is not enabled. If you want this
feature turned on permanently, add a hook function to
fortran-mode-hook to execute
See section Hooks.