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 documents. 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 directories, 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 explicitly.
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) preprocessor. 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 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 use
ful for debugging. See groff_trace(7).; tty-char
Overrides the definition of standard troff characters and some groff characters for tty devices.
The optical appearance is intentionally inferior
compared to that of normal tty formatting 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 directly 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 providing two macro
files for the inflicted macro packages; one with a leading
`m', the other one without 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 modern 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 directory 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 pipeline 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/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/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 requests, escape
sequences, strings, numeric registers, and macros from a
macro package. These elements 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 evaluated. 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 _$0 _*[midpart] _n[.$] arguments: . tm _$*
..; When calling this macro by

.print_args arg1 arg2; the following text is printed to the terminal:

_p_r_i_n_t__a_r_g_s _w_a_s _c_a_l_l_e_d _w_i_t_h _t_h_e _f_o_l_l_o_w_i_n_g _2

_a_r_g_u_m_e_n_t_s_:
_a_r_g_1 _a_r_g_2; 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 results in __$_* and __[_._$_]. The same applies to the macro name because it could be called with an alias name, so __$_0.; On the other hand, _m_i_d_p_a_r_t is a constant string, it will not change, so no doubling for _*_[_m_i_d_p_a_r_t_]. 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_[_].
DDrraafftt MMooddee: 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 ..eeoo and ..eecc 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 0 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, registers, 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 _._e_o request.
TTiippss ffoorr MMaaccrroo DDeeffiinniittiioonnss: +o Start every line with a dot, for example, by using the
groff request ..nnoopp 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]
..; +o 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 ignores its arguments, so it acts like a comment line:

.de c
..
.c This is like a comment line.; +o In long macro definitions, make ample use of comment
lines or empty lines for a better structuring.; +o To increase readability, use groff's indentation facili
ty for requests and macro calls (arbitrary whitespace after the leading dot).
DDiivveerrssiioonnss: 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 calling 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 secure side, enclose everything that has to do with diversions into a pair of line breaks; for example, by amply using ..bbrr 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 ..bbooxx 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.
FFIILLEESS
All macro names must be named _n_a_m_e..ttmmaacc to fully use the tmac mechanism. ttmmaacc.._n_a_m_e as with classical packages is possible as well, but deprecated.
The macro files are kept in the _t_m_a_c _d_i_r_e_c_t_o_r_i_e_s; a colon separated list of these constitutes the _t_m_a_c _p_a_t_h.
The search sequence for macro files is (in that order):
+o the directories specified with troff/groff's --MM command: line option
+o the directories given in the $$GGRROOFFFF_TTMMAACC_PPAATTHH environ: ment variable
+o the current directory (only if in unsafe mode, which is: enabled by the --UU command line switch)
+o the home directory
+o a platform-specific directory, being //uussrr//sshhaarree//ttmmaacc in: this installation
+o a site-specific (platform-independent) directory, being: //uussrr//sshhaarree//ttmmaacc in this installation
+o the main tmac directory, being //uussrr//sshhaarree//ttmmaacc in this: installation
EENNVVIIRROONNMMEENNTT
$$GGRROOFFFF_TTMMAACC_PPAATTHH: A colon separated list of additional tmac directories in which to search for macro files. See the previous section for a detailed description.
AAUUTTHHOORR
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 http://www.gnu.org/ copyleft/fdl.html <GNU copyleft site>.
This document is part of _g_r_o_f_f, the GNU roff distribution. It was written by it is maintained by
SSEEEE AALLSSOO A complete reference for all parts of the groff system is found in the groff iinnffoo(1) file.
ggrrooffff(1): an overview of the groff system.
ggrrooffff_mmaann(7), ggrrooffff_mmddoocc(7), ggrrooffff_mmee(7),
ggrrooffff_mmmm(7),
ggrrooffff_mmoomm(7), ggrrooffff_mmss(7),
ggrrooffff_ttrraaccee(7), ggrrooffff_wwwwww(7).: the groff tmac macro packages.
ggrrooffff(7): the groff language.
The Filesystem Hierarchy Standard is available at the http://www.pathname.com/fhs/ <FHS web site>.

docs.sk

comprehensive documentation repository

See also