(lemacs.info)Fortran Columns

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`C-c C-r'
     Displays a "column ruler" momentarily above the current line

`C-c C-w'
     Splits the current window horizontally so that it is 72 columns
     wide.  This may help you avoid going over that limit

   The command `C-c C-r' (`fortran-column-ruler') shows a column ruler
above the current line.  The comment ruler consists of 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 not be those you are familiar
with; but the actual positions in the line are standard Fortran.

   The text used to display the column ruler is the value of the
variable `fortran-comment-ruler'.  By changing this variable, you can
change the display.

   For even more help, use `C-c C-w' (`fortran-window-create'), a
command which splits the current window horizontally, resulting in a
window 72 columns wide.  When you edit in this window, you can
immediately see when a line gets too wide to be correct Fortran.

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