31.12.5 Checking Columns in Fortran
- C-c C-r
- Display a “column ruler” momentarily above the current line
- 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
The text used to display the column ruler depends on the value of the
nil, then the value of the variable
fortran-column-ruler-fixed is used as the column ruler.
Otherwise, the value of the variable
displayed. By changing these variables, you can change the column ruler
C-c C-w (
splits the current window horizontally, making a window 72 columns
wide, so you can see any lines that are 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 (
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.