31.12.2.1 Fortran Indentation and Filling Commands

C-M-j

Break the current line at point and set up a continuation line (fortran-split-line).

M-^

Join this line to the previous line (fortran-join-line).

C-M-q

Indent all the lines of the subprogram point is in (fortran-indent-subprogram).

M-q

Fill a comment block or 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.