.TH GROTTY 1 "7 February 2022" "groff 1.22.4"
.SH NAME
grotty \- groff driver for typewriter-like devices
.
.
.\" ====================================================================
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.\" ====================================================================
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.\"
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.\" included in translations approved by the Free Software Foundation
.\" 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
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.
.
.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: