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Break the current line at point and set up a continuation
line (fortran-split-line).
Join this line to the previous line
(fortran-join-line).
Indent all the lines of the subprogram that point is in
(fortran-indent-subprogram).
Fill a comment block or statement (using
fortran-fill-paragraph or
fortran-fill-statement).
The key C-M-q runs
fortran-indent-subprogram, a command to reindent all
the lines of the Fortran subprogram (function or subroutine)
containing point.
The key C-M-j runs fortran-split-line,
which splits a line in the appropriate fashion for Fortran. In a
non-comment line, the second half becomes a continuation line and
is indented accordingly. In a comment line, both halves become
separate comment lines.
M-^ or C-c C-d runs the command
fortran-join-line, which joins a continuation line
back to the previous line, roughly as the inverse of
fortran-split-line. The point must be on a
continuation line when this command is invoked.
M-q in Fortran mode fills the comment block or statement that point is in. This removes any excess statement continuations.