GROFF_TMAC(5) GROFF_TMAC(5)
NAME
groff_tmac - macro files in the roff typesetting system
DESCRIPTION
The roff(7) type-setting system provides a set of macro packages suitable for special kinds of docu-ments. documents.
ments. Each macro package stores its macros and definitions in a file called the package's tmac
file. The name is deduced from `TroffMACros'.
The tmac files are normal roff source documents, except that they usually contain only definitions
and setup commands, but no text. All tmac files are kept in a single or a small number of directo-ries, directories,
ries, the tmac directories.
GROFF MACRO PACKAGES
groff provides all classical macro packages, some more full packages, and some secondary packages for
special purposes. Note that it is not possible to use multiple primary macro packages at the same
time; saying e.g.
sh# groff -m man -m ms foo
or
sh# groff -m man foo -m ms bar
will fail.
Man Pages
man This is the classical macro package for UNIX manual pages (man pages); it is quite handy and
easy to use; see groff_man(7).
doc
mdoc An alternative macro package for man pages mainly used in BSD systems; it provides many new
features, but it is not the standard for man pages; see groff_mdoc(7).
Full Packages
The packages in this section provide a complete set of macros for writing documents of any kind, up
to whole books. They are similar in functionality; it is a matter of taste which one to use.
me The classical me macro package; see groff_me(7).
mm The semi-classical mm macro package; see groff_mm(7).
mom The new mom macro package, only available in groff. As this is not based on other packages,
it can be freely designed. So it is expected to become quite a nice, modern macro package.
See groff_mom(7).
ms The classical ms macro package; see groff_ms(7).
Special Packages
The macro packages in this section are not intended for stand-alone usage, but can be used to add
special functionality to any other macro package or to plain groff.
papersize
This macro file is already loaded at start-up by troff so it isn't necessary to call it ex-plicitly. explicitly.
plicitly. It provides an interface to set the paper size on the command line with the option
-dpaper=size. Possible values for size are the same as the predefined papersize values in the
DESC file (only lowercase; see groff_font(5) for more) except a7-d7. An appended l (ell)
character denotes landscape orientation. Examples: a4, c3l, letterl.
Most output drivers need additional command line switches -p and -l to override the default
paper length and orientation as set in the driver specific DESC file. For example, use the
following for PS output on A4 paper in landscape orientation:
sh# groff -Tps -dpaper=a4l -P-pa4 -P-l -ms foo.ms > foo.ps
pic This file provides proper definitions for the macros PS and PE, needed for the pic(1) pre-processor. preprocessor.
processor. They will center each picture. Use it only if your macro package doesn't provide
proper definitions for those two macros (actually, most of them already have).
pspic A single macro is provided in this file, PSPIC, to include a PostScript graphic in a document.
It makes only sense for output devices which support inclusion of PS images: -Tps, -Tdvi, and
-Thtml; the file is then loaded automatically. Syntax:
.PSPIC [-L|-R|-I n] file [width [height]]
file is the name of the file containing the illustration; width and height give the desired
width and height of the graphic. The width and height arguments may have scaling indicators
attached; the default scaling indicator is i. This macro will scale the graphic uniformly in
the x and y directions so that it is no more than width wide and height high. By default, the
graphic will be horizontally centered. The -L and -R options cause the graphic to be left-aligned leftaligned
aligned and right-aligned, respectively. The -I option causes the graphic to be indented by n
(default scaling indicator is m).
trace Use this for tracing macro calls. It is only useful for debugging. See groff_trace(7).
tty-char
Overrides the definition of standard troff characters and some groff characters for tty de-vices. devices.
vices. The optical appearance is intentionally inferior compared to that of normal tty for-matting formatting
matting to allow processing with critical equipment.
www Additions of elements known from the html format, as being used in the internet (World Wide
Web) pages; this includes URL links and mail addresses; see groff_www(7).
NAMING
In classical roff systems, there was a funny naming scheme for macro packages, due to a simplistic
design in option parsing. Macro packages were always included by option -m; when this option was di-rectly directly
rectly followed by its argument without an intervening space, this looked like a long option preceded
by a single minus -- a sensation in the computer stone age. To make this optically working for macro
package names, all classical macro packages choose a name that started with the letter `m', which was
omitted in the naming of the macro file.
For example, the macro package for the man pages was called man, while its macro file tmac.an. So it
could be activated by the argument an to option -m, or -man for short.
For similar reasons, macro packages that did not start with an `m' had a leading `m' added in the
documentation and in talking; for example, the package corresponding to tmac.doc was called mdoc in
the documentation, although a more suitable name would be doc. For, when omitting the space between
the option and its argument, the command line option for activating this package reads -mdoc.
To cope with all situations, actual versions of groff(1) are smart about both naming schemes by pro-viding providing
viding two macro files for the inflicted macro packages; one with a leading `m', the other one with-out without
out it. So in groff, the man macro package may be specified as on of the following four methods:
sh# groff -m man
sh# groff -man
sh# groff -mman
sh# groff -m an
Recent packages that do not start with `m' do not use an additional `m' in the documentation. For
example, the www macro package may be specified only as one of the two methods:
sh# groff -m www
sh# groff -mwww
Obviously, variants like -mmwww would not make much sense.
A second strange feature of classical troff was to name macro files according to tmac.name. In mod-ern modern
ern operating systems, the type of a file is specified as postfix, the file name extension. Again,
groff copes with this situation by searching both anything.tmac and tmac.anything if only anything is
specified.
The easiest way to find out which macro packages are available on a system is to check the man page
groff(1), or the contents of the tmac directories.
In groff, most macro packages are described in man pages called groff_name(7), with a leading `m' for
the classical packages.
INCLUSION
There are several ways to use a macro package in a document. The classical way is to specify the
troff/groff option -m name at run-time; this makes the contents of the macro package name available.
In groff, the file name.tmac is searched within the tmac path; if not found, tmac.name will be
searched for instead.
Alternatively, it is also possible to include a macro file by adding the request .so filename into
the document; the argument must be the full file name of an existing file, possibly with the directo-ry directory
ry where it is kept. In groff, this was improved by the similar request .mso package, which added
searching in the tmac path, just like option -m does.
Note that in order to resolve the .so and .mso requests, the roff preprocessor soelim(1) must be
called if the files to be included need preprocessing. This can be done either directly by a pipe-line pipeline
line on the command line or by using the troff/groff option -s. man calls soelim automatically.
For example, suppose a macro file is stored as /usr/share/groff/1.19.2/tmac/macros.tmac and is used
in some document called docu.roff.
At run-time, the formatter call for this is
sh# groff -m macrofile document.roff
To include the macro file directly in the document either
.mso macrofile.tmac
is used or
.so /usr/share/groff/1.19.2/tmac/macros.tmac
In both cases, the formatter is called with
sh# groff -s docu.roff
If you want to write your own groff macro file, call it whatever.tmac and put it in some directory of
the tmac path, see section FILES. Then documents can include it with the .mso request or the option
-m.
WRITING MACROS
A roff(7) document is a text file that is enriched by predefined formatting constructs, such as re-quests, requests,
quests, escape sequences, strings, numeric registers, and macros from a macro package. These ele-ments elements
ments are described in roff(7).
To give a document a personal style, it is most useful to extend the existing elements by defining
some macros for repeating tasks; the best place for this is near the beginning of the document or in
a separate file.
Macros without arguments are just like strings. But the full power of macros reveals when arguments
are passed with a macro call. Within the macro definition, the arguments are available as the escape
sequences $1, ..., $9, $[...], $*, and $@, the name under which the macro was called is in $0, and
the number of arguments is in register 0; see groff(7).
Copy-in Mode
The phase when groff reads a macro is called copy-in mode in roff-talk. This is comparable to the
C preprocessing phase during the development of a program written in the C language.
In this phase, groff interprets all backslashes; that means that all escape sequences in the macro
body are interpreted and replaced by their value. For constant expression, this is wanted, but
strings and registers that might change between calls of the macro must be protected from being eval-uated. evaluated.
uated. This is most easily done by doubling the backslash that introduces the escape sequence. This
doubling is most important for the positional parameters. For example, to print information on the
arguments that were passed to the macro to the terminal, define a macro named `.print_args', say.
.ds midpart was called with
.de print_args
. tm \f[I]\\$0\f[] \\*[midpart] \\n[.$] arguments:
. tm \\$*
..
When calling this macro by
.print_args arg1 arg2
the following text is printed to the terminal:
print_args was called with the following 2 arguments:
arg1 arg2
Let's analyze each backslash in the macro definition. As the positional parameters and the number of
arguments will change with each call of the macro their leading backslash must be doubled, which re-sults results
sults in \\$* and \\[.$]. The same applies to the macro name because it could be called with an
alias name, so \\$0.
On the other hand, midpart is a constant string, it will not change, so no doubling for \*[midpart].
The \f escape sequences are predefined groff elements for setting the font within the text. Of
course, this behavior will not change, so no doubling with \f[I] and \f[].
Draft Mode
Writing groff macros is easy when the escaping mechanism is temporarily disabled. In groff, this is
done by enclosing the macro definition(s) into a pair of .eo and .ec requests. Then the body in the
macro definition is just like a normal part of the document -- text enhanced by calls of requests,
macros, strings, registers, etc. For example, the code above can be written in a simpler way by
.eo
.ds midpart was called with
.de print_args
. tm \f[I]\$0\f[] \*[midpart] \n[.$] arguments:
. tm \$*
..
.ec
Unfortunately, draft mode cannot be used universally. Although it is good enough for defining normal
macros, draft mode will fail with advanced applications, such as indirectly defined strings, regis-ters, registers,
ters, etc. An optimal way is to define and test all macros in draft mode and then do the backslash
doubling as a final step; do not forget to remove the .eo request.
Tips for Macro Definitions
Start every line with a dot, for example, by using the groff request .nop for text lines, or write
your own macro that handles also text lines with a leading dot.
.de Text
. if (\\n[.$] == 0) \
. return
. nop \)\\$*[rs]
..
Write a comment macro that works both for copy-in and draft mode; for as escaping is off in draft
mode, trouble might occur when normal comments are used. For example, the following macro just ig-nores ignores
nores its arguments, so it acts like a comment line:
.de c
..
.c This is like a comment line.
In long macro definitions, make ample use of comment lines or empty lines for a better structuring.
To increase readability, use groff's indentation facility for requests and macro calls (arbitrary
whitespace after the leading dot).
Diversions
Diversions can be used to realize quite advanced programming constructs. They are comparable to
pointers to large data structures in the C programming language, but their usage is quite different.
In their simplest form, diversions are multi-line strings, but they get their power when diversions
are used dynamically within macros. The information stored in a diversion can be retrieved by call-ing calling
ing the diversion just like a macro.
Most of the problems arising with diversions can be avoided if you are conscious about the fact that
diversions always deal with complete lines. If diversions are used when the line buffer has not been
flashed, strange results are produced; not knowing this, many people get desperate about diversions.
To ensure that a diversion works, line breaks should be added at the right places. To be on the se-cure secure
cure side, enclose everything that has to do with diversions into a pair of line breaks; for example,
by amply using .br requests. This rule should be applied to diversion definition, both inside and
outside, and to all calls of diversions. This is a bit of overkill, but it works nicely.
[If you really need diversions which should ignore the current partial line, use environments to save
the current partial line and/or use the .box request.]
The most powerful feature using diversions is to start a diversion within a macro definition and end
it within another macro. Then everything between each call of this macro pair is stored within the
diversion and can be manipulated from within the macros.
FILES
All macro names must be named name.tmac to fully use the tmac mechanism. tmac.name as with classical
packages is possible as well, but deprecated.
The macro files are kept in the tmac directories; a colon separated list of these constitutes the
tmac path.
The search sequence for macro files is (in that order):
the directories specified with troff/groff's -M command line option
the directories given in the $GROFF_TMAC_PATH environment variable
the current directory (only if in unsafe mode, which is enabled by the -U command line switch)
the home directory
a platform-specific directory, being /usr/lib/groff/site-tmac in this installation
a site-specific (platform-independent) directory, being /usr/share/groff/site-tmac in this instal-lation installation
lation
the main tmac directory, being /usr/share/groff/1.19.2/tmac in this installation
ENVIRONMENT
$GROFF_TMAC_PATH
A colon separated list of additional tmac directories in which to search for macro files. See
the previous section for a detailed description.
AUTHOR
Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
This document is distributed under the terms of the FDL (GNU Free Documentation License) version 1.1
or later. You should have received a copy of the FDL on your system, it is also available on-line at
the GNU copyleft site <http://www.gnu.org/copyleft/fdl.html.
This document is part of groff, the GNU roff distribution. It was written by
Bernd Warken <bwarken@mayn.de>; it is maintained by
Werner Lemberg <wl@gnu.org>.
SEE ALSO
A complete reference for all parts of the groff system is found in the groff info(1) file.
groff(1)
an overview of the groff system.
groff_man(7),
groff_mdoc(7),
groff_me(7),
groff_mm(7),
groff_mom(7),
groff_ms(7),
groff_trace(7),
groff_www(7).
the groff tmac macro packages.
groff(7)
the groff language.
The Filesystem Hierarchy Standard is available at the FHS web site <http://www.pathname.com/fhs/.
Groff Version 1.19.2 28 July 2004 GROFF_TMAC(5)
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