.TH GROTTY 1 "27 January 2021" "groff 1.22.4"
.SH NAME
grotty \- groff driver for typewriter-like devices
.
.
.\" ====================================================================
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.\" ====================================================================
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.\" instead of in the original English.
.
.
.\" Save and disable compatibility mode (for, e.g., Solaris 10/11).
.do nr grotty_C \n[.C]
.cp 0
.
.
.\" ====================================================================
.SH SYNOPSIS
.\" ====================================================================
.
.SY grotty
.OP \-bBcdfhioruUv
.OP \-F dir
.RI [ file
\&.\|.\|.\&]
.YS
.
.
.\" ====================================================================
.SH DESCRIPTION
.\" ====================================================================
.
.B grotty
translates the output of GNU
.B troff
into a form suitable for typewriter-like devices.
.
Normally
.B grotty
should be invoked by using the
.B groff
command with a
.BR \-Tascii ,
.B \-Tlatin1
or
.B \-Tutf8
option on ASCII based systems, and with
.B \-Tcp1047
and
.B \-Tutf8
on EBCDIC based hosts.
.
If no files are given,
.B grotty
reads the standard input.
.
A filename of
.B \-
also causes
.B grotty
to read the standard input.
.
Output is written to the standard output.
.
.
.LP
By default,
.B grotty
emits SGR escape sequences (from ISO 6429, also called ANSI color
escapes) to change text attributes (bold, italic, colors).
.
This makes it possible to have eight different background and
foreground colors; additionally, bold and italic attributes can be
used \f[BI]at the same time\f[] (by using the BI font).
.
.
.LP
The following colors are defined in
.BR tty.tmac :
black, white, red, green, blue, yellow, magenta, cyan.
.
Unknown colors are mapped to the default color (which is dependent on
the settings of the terminal; in most cases, this is black for the
foreground and white for the background).
.
.
.LP
Use the
.B \-c
switch to revert to the old behaviour, printing a bold character
.I c
with the sequence
.RI \[lq] c
BACKSPACE
.IR c \[rq]
and an italic character
.I c
by the sequence
.RB \[lq] _
BACKSPACE
.IR c \[rq].
.
At the same time, color output is disabled.
.
The same effect can be achieved by setting either the
.I GROFF_NO_SGR
environment variable or using the \[oq]sgr\[cq] X command (see below).
.
.
.LP
(Debian-specific: The old behaviour is the default when using the
.B man
and
.B mdoc
macro packages, because most pagers either fail to cope with SGR escape
sequences or need special options to do so.
SGR output can be re-enabled permanently by editing
.I /etc/groff/man.local
and
.IR /etc/groff/mdoc.local ,
or temporarily by setting the
.I GROFF_SGR
environment variable to something non-empty.)
.
.
.LP
For SGR support, it is necessary to use the
.B \-R
option of
.BR less (1)
to disable the interpretation of
.BR grotty 's
old output format.
.
Consequently, all programs which use
.B less
as the pager program have to pass this option to it.
.
For
.BR man (1)
in particular, either add
.B \-R
to the
.I PAGER
environment variable, e.g.\&
.
.RS
.LP
.B PAGER="/usr/bin/less \-R"
.br
.B export PAGER
.RE
.LP
.
or use the
.B \-P
option of
.B man
to set the pager executable and its options, or modify the
configuration file of
.B man
in a similar fashion.
.
Note that with some
.BR man (1)
versions, you have to use the
.I \%MANPAGER
environment variable instead.
.
.
.LP
.BR grotty 's
old output format can be displayed on a terminal
by piping through
.BR ul (1).
Pagers such as
.BR more (1)
or
.BR less (1)
are also able to display these sequences.
Use either
.B \-B
or
.B \-U
when piping into
.BR less (1);
use
.B \-b
when piping into
.BR more (1).
There is no need to filter the output through
.BR col (1)
since
.B grotty
never outputs reverse line feeds.
.
.
.LP
The font description file may contain a command
.
.IP
.BI internalname\  n
.LP
.
where
.I n
is a decimal integer.
.
If the 01 bit in
.I n
is set,
then the font is treated as an italic font;
if the 02 bit is set,
then it is treated as a bold font.
.
The code field in the font description field gives the code which is
used to output the character.
.
This code can also be used in the
.B \[rs]N
escape sequence in
.BR troff .
.
.
.LP
If the
.I DESC
file contains the keyword
.BR unicode ,
.B grotty
emits Unicode characters in UTF-8 encoding.
.
Otherwise, it emits characters in a single-byte encoding depending on
the data in the font description files.
.
See the
.BR groff_font (5)
man page for more details.
.
.
.\" ====================================================================
.SH OPTIONS
.\" ====================================================================
.
Whitespace is permitted between a command-line option and its argument.
.
.
.TP
.B \-b
Suppress the use of overstriking for bold characters.
.
Ignored if
.B \-c
isn't used.
.
.TP
.B \-B
Use only overstriking for bold-italic characters.
Ignored if
.B \-c
isn't used.
.
.TP
.B \-c
Use
.BR grotty 's
old output format (see above).
This also disables color output.
(Debian-specific: This option is enabled by default when using the
.B man
and
.B mdoc
macro packages.
It can be disabled by default permanently by editing
.I /etc/groff/man.local
and
.IR /etc/groff/mdoc.local ,
or temporarily by setting the
.I GROFF_SGR
environment variable to something non-empty.)
.
.TP
.B \-d
Ignore all
.B \[rs]D
commands.
.
Without this
.B grotty
renders
.B \[rs]D'l\|.\|.\|.\&'
commands that have at least one zero argument
(and so are either horizontal or vertical)
using
.BR \- ,
.BR | ,
and
.B +
characters.
.
In a similar way,
.B grotty
handles
.B \[rs]D'p\|.\|.\|.\&'
commands which consist entirely of horizontal and vertical lines.
.
.
.TP
.B \-f
Use form feeds in the output.
.
A form feed is output at the end of each page that has no output on
its last line.
.
.TP
.BI \-F dir
Prepend directory
.RI dir /dev name
to the search path for font and device description files;
.I name
is the name of the device, usually
.BR ascii ,
.BR latin1 ,
.BR utf8 ,
or
.BR cp1047 .
.
.TP
.B \-h
Use horizontal tabs in the output.
.
Tabs are assumed to be set every 8 columns.
.
.TP
.B \-i
Use escape sequences to set the italic text attribute instead of the
underline attribute for italic fonts (\[oq]I\[cq] and \[oq]BI\[cq]).
.
Note that most terminals (including xterm) don't support this.
.
Ignored if
.B \-c
is active.
.
.TP
.B \-o
Suppress overstriking (other than for bold or underlined characters in
case the old output format has been activated with
.BR \-c ).
.
.TP
.B \-r
Use escape sequences to set the reverse text attribute instead of the
underline attribute for italic fonts (\[oq]I\[cq] and \[oq]BI\[cq]).
.
Ignored if
.B \-c
is active.
.
.TP
.B \-u
Suppress the use of underlining for italic characters.
.
Ignored if
.B \-c
isn't used.
.
.TP
.B \-U
Use only underlining for bold-italic characters.
.
Ignored if
.B \-c
isn't used.
.
.TP
.B \-v
Print the version number.
.
.
.\" ====================================================================
.SH USAGE
.\" ====================================================================
.
.B grotty
understands a single X command produced using the
.B \[rs]X
escape sequence.
.
.TP
.BI \[rs]X'tty:\ sgr\  n '
.
If
.I n
is non-zero or missing, enable SGR output (this is the default),
otherwise use the old drawing scheme for bold and underline.
.
.
.\" ====================================================================
.SH ENVIRONMENT
.\" ====================================================================
.
.TP
.I GROFF_NO_SGR
If set, the old drawing scheme for bold and underline (using the
backspace character) is active.
.
Colors are disabled.
.
.
.TP
.I GROFF_FONT_PATH
A list of directories in which to search for the
.IR dev name
directory in addition to the default ones.
.
See
.BR troff (1)
and
.BR \%groff_font (5)
for more details.
.
.
.\" ====================================================================
.SH FILES
.\" ====================================================================
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:font/devascii/DESC
Device description file for the
.B ascii
device.
.
.TP
.IR /usr/\:share/\:groff/\:1.22.4/\:font/devascii/ F
Font description file for font
.I F
of the
.B ascii
device.
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:font/devlatin1/DESC
Device description file for the
.B latin1
device.
.
.TP
.IR /usr/\:share/\:groff/\:1.22.4/\:font/devlatin1/ F
Font description file for font
.I F
of the
.B latin1
device.
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:font/devutf8/DESC
Device description file for the
.B utf8
device.
.
.TP
.IR /usr/\:share/\:groff/\:1.22.4/\:font/devutf8/ F
Font description file for font
.I F
of the
.B utf8
device.
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:font/devcp1047/DESC
Device description file for the
.B cp1047
device.
.
.TP
.IR /usr/\:share/\:groff/\:1.22.4/\:font/devcp1047/ F
Font description file for font
.I F
of the
.B cp1047
device.
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:tmac/tty.tmac
Macros for use with
.BR grotty .
.
.TP
.I /usr/\:share/\:groff/\:1.22.4/\:tmac/tty\-char.tmac
Additional character definitions for use with
.BR grotty .
.
.LP
Note that on EBCDIC hosts, only files for the
.B cp1047
device is installed.
.
.
.\" ====================================================================
.SH BUGS
.\" ====================================================================
.
.B grotty
is intended only for simple documents.
.
.
.LP
There is no support for fractional horizontal or vertical motions.
.
.
.LP
There is no support for
.B \[rs]D
commands other than horizontal and vertical lines.
.
.
.LP
Characters above the first line (i.e.\& with a vertical position
of\~0) cannot be printed.
.
.
.LP
Color handling differs from
.BR grops (1).
.B \[rs]M
doesn't set the fill color for closed graphic objects (which
.B grotty
doesn't support anyway) but changes the background color of the
character cell, affecting all subsequent operations.
.
.
.\" ====================================================================
.SH "SEE ALSO"
.\" ====================================================================
.BR groff (1),
.BR troff (1),
.BR groff_out (5),
.BR groff_font (5),
.BR groff_char (7),
.BR ul (1),
.BR more (1),
.BR man (1),
.BR less (1)
.
.
.\" Restore compatibility mode (for, e.g., Solaris 10/11).
.cp \n[grotty_C]
.
.
.\" Local Variables:
.\" mode: nroff
.\" End:
.\" vim: set filetype=groff: