20.1.1 Nroff Mode
Nroff mode is a mode like Text mode but modified to handle nroff
commands present in the text. Invoke `M-x nroff-mode' to enter this
mode. Nroff mode differs from Text mode in only a few ways. All nroff
command lines are considered paragraph separators, so that filling never
garbles the nroff commands. Pages are separated by `.bp' commands.
Comments start with backslash-doublequote. There are also three special
commands that are not available in Text mode:
Move to the beginning of the next line that isn't an nroff command
(`forward-text-line'). An argument is a repeat count.
Like `M-n' but move up (`backward-text-line').
Prints in the echo area the number of text lines (lines that are
not nroff commands) in the region (`count-text-lines').
The other feature of Nroff mode is Electric Nroff newline mode.
This is a minor mode that you can turn on or off with `M-x
electric-nroff-mode' (Note: Minor Modes). When the mode is on and
you use <RET> to end a line containing an nroff command that opens a
kind of grouping, Emacs automatically inserts the matching nroff
command to close that grouping on the following line. For example, if
you are at the beginning of a line and type `.(b <RET>', the matching
command `.)b' will be inserted on a new line following point.
Entering Nroff mode calls the value of the variable `text-mode-hook'
with no arguments, if that value exists and is not `nil'; then it does
the same with the variable `nroff-mode-hook'.
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