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(emacs)Fortran Columns

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Checking Columns in Fortran
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`C-c C-r'
     Display a "column ruler" momentarily above the current line
     (`fortran-column-ruler').

`C-c C-w'
     Split the current window horizontally temporarily so that it is 72
     columns wide (`fortran-window-create-momentarily').  This may help
     you avoid making lines longer than the 72-character limit that
     some Fortran compilers impose.

`C-u C-c C-w'
     Split the current window horizontally so that it is 72 columns wide
     (`fortran-window-create').  You can then continue editing.

`M-x fortran-strip-sequence-nos'
     Delete all text in column 72 and beyond.

   The command `C-c C-r' (`fortran-column-ruler') shows a column ruler
momentarily above the current line.  The comment ruler is two lines of
text that show you the locations of columns with special significance in
Fortran programs.  Square brackets show the limits of the columns for
line numbers, and curly brackets show the limits of the columns for the
statement body.  Column numbers appear above them.

   Note that the column numbers count from zero, as always in GNU Emacs.
As a result, the numbers may be one less than those you are familiar
with; but the positions they indicate in the line are standard for
Fortran.

   The text used to display the column ruler depends on the value of
the variable `indent-tabs-mode'.  If `indent-tabs-mode' is `nil', then
the value of the variable `fortran-column-ruler-fixed' is used as the
column ruler.  Otherwise, the variable `fortran-column-ruler-tab' is
displayed.  By changing these variables, you can change the column
ruler display.

   `C-c C-w' (`fortran-window-create-momentarily') temporarily splits
the current window horizontally, making a window 72 columns wide, so
you can see which lines that is too long.  Type a space to restore the
normal width.

   You can also split the window horizontally and continue editing with
the split in place.  To do this, use `C-u C-c C-w' (`M-x
fortran-window-create').  By editing in this window you can immediately
see when you make a line too wide to be correct Fortran.

   The command `M-x fortran-strip-sequence-nos' deletes all text in
column 72 and beyond, on all lines in the current buffer.  This is the
easiest way to get rid of old sequence numbers.