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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. It differs from Text mode in only a few ways. All nroff command
lines are considered paragraph separators, so that filling will never
garble the nroff commands. Pages are separated by `.bp' commands.
Comments start with backslash-doublequote. Also, three special
commands are provided that are not 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 that you can turn on Electric
Nroff 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, each
time you use RET to end a line that contains an nroff command that
opens a kind of grouping, the matching nroff command to close that
grouping is automatically inserted on the following line. For example,
if you are at the beginning of a line and type `. ( b RET', this
inserts the matching command `.)b' on a new line following point.
Entering Nroff mode runs the hook `text-mode-hook', followed by the
hook `nroff-mode-hook' (Note: Hooks.).
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