This section describes recent user-visible changes in groff. Bug fixes are not described. There are more details in the man pages.

Please read the changes below regarding grotty, groff’s tty frontend.

Troff

• Color support has been added to troff and pic (and to the device drivers grops, grodvi, grotty, and grohtml – other preprocessors and drivers will follow). A new function ‘defcolor’ defines colors; the escape sequence ‘\m’ sets the drawing color, the escape sequence ‘\M’ specifies the background color for closed objects created with \D’...’ commands. ‘\m[]’ and ‘\M[]’ switch back to the previous color. ‘\m’ and ‘\M’ correspond to the new troff output command sets starting with ‘m’ and ‘DF’. The device-specific default color is called ‘default’ and can’t be redefined.

  Use the ‘color’ request to toggle the usage of colors (default is on); the read-only register ‘.color’ is 0 if colors are not active, and non-zero otherwise.

  The old ‘Df’ output command is mapped onto ‘DFg’; all color output commands don’t change the current font position (consequently, ‘Df’ doesn’t either).

  Outputting color can be disabled in troff and groff with the option −c (it is always disabled in compatibility mode). See the section on grotty for the GROFF_NO_SGR environment variable also.

  For defining color components as fractions between 0 and 1, a new scaling indicator ‘f’ has been defined: 1f = 65536u. For testing whether a color is defined (with .if and .ie), a new conditional operator ‘m’ is available.

  More details can be found in the groff_diff.7 manual page and in groff.texinfo.

• Similar to \m and \M, \f[] switches back to the previous font. \fP (and \f[P]) is still valid for backwards compatibility.

• The new escape \F is the same as ‘.fam’; \F[] switches back to previous family – \F[P] selects family ‘P’.

• Two new glyph symbols are available: ‘eu’ is the official Euro symbol; ‘Eu’ is a font-specific glyph variant.

• The new glyph symbols ‘t+−’, ‘tdi’, and ‘tmu’ are textual variants of ‘+−’, ‘di’, and ‘mu’, respectively.

• Latin-1 character 181 (PS name ‘mu’, Unicode name U+00B5 MICRO SIGN) has got the troff glyph name ‘mc’.

• −Tutf8 is now available on EBCDIC hosts.

• Strings can take arguments, using this syntax: \*[foo arg1 arg2 ...]. Example:

  .ds xxx This is a \\$1 test.
  \*[xxx nice]

• It is now possible to have whitespace between the first and second dot (or the name of the ending macro) to end a macro definition. Example:

  .de !
  ..
  .
  .de foo
  .  nop Hello, I’m ‘foo’.
  .  nop I will now define ‘bar’.
  .  de bar !
  .    nop Hello, I’m ‘bar’.
  .  !
  ..

• ‘.fn’ is a new string-valued register which returns the (internal) real font name; styles and families are properly concatenated.

• Three new read/write registers ‘seconds’, ‘minutes’, and ‘hours’ contain the current time, set at start-up of troff. Use the ‘af’ request to control their output format.

• The new request ‘fchar’ can be used to provide fallback characters. It has the same syntax as the ‘char’ request; the only difference is that a character defined with ‘.char’ hides the glyph with the same name in the current font, whereas a character defined with ‘.fchar’ is checked only if the particular glyph isn’t found in the current font. This test happens before checking special fonts.

• In analogy to the ‘tmc’ request, ‘.writec’ is the same as ‘.write’ but doesn’t emit a final newline.

• The new request ‘itc’ is a variant of ‘.it’ for which a line interrupted with \c counts as one input line.

• Two new requests ‘ds1’ and ‘as1’ which are similar to ‘ds’ and ‘as’ but with compatibility mode disabled during expansion of strings defined by them.

• The syntax of the ‘substring’ request has been changed: The first character in a string now has index 0, the last character has index −1. Note that this is an incompatible change.

• To emit strings directly to the intermediate output, a new ‘output’ request has been added; it is similar to ‘\!’ used at the top level.

• ‘.hpf’ has been extended. It can now handle most TeX hyphenation pattern files without modification. To do that, the commands \patterns, \hyphenation, and \endinput are recognized. Please refer to groff_diff.7 for more information.

• ‘hpfcode’ is a new request to provide an input encoding mapping for the ‘hpf’ request.

• The new request ‘hpfa’ appends hyphenation patterns (‘hpf’ replaces already existing patterns).

• A new request ‘ami’ (append macro indirect) has been added. The first and second parameter of ‘ami’ are taken from string registers rather than directly; this very special request is needed to make ‘trace.tmac’ independent from the escape character (which might even be disabled).

• The new request ‘sizes’ is similar to the ‘sizes’ command in DESC files. It expects the same syntax; the data must be on a single line, and the final ‘0’ can be omitted.

• ‘trin’ (translate input) is a new request which is similar to ‘tr’ with the exception that the ‘asciify’ request uses the character code (if any) before the character translation. Example:

  .trin ax
  .di xxx
  a
  .br
  .di
  .xxx
  .trin aa
  .asciify xxx
  .xxx

  The result is ‘x a’. Using ‘tr’, the result would be ‘x x’.

• The request ‘pvs’ isn’t new, but hasn’t been documented before. It adds vertical space after a line has been output. This makes it an alternative to the ‘ls’ request to produce double-spaced documents. The read-only register ‘.pvs’ holds the current amount of the post-vertical line space.

• For compatibility with plan 9’s troff, multiple ‘pi’ requests are supported:

  .pi foo
  .pi bar

  is now equivalent to

  .pi foo | bar

• A new escape sequence ‘\O’ is available to disable and enable glyph output. Please see groff_diff.man and groff.texinfo for more details.

• The escapes ‘\%’, ‘\&’, ‘\)’, and ‘\:’ no longer cause an error in \X; they are ignored now. Additionally ‘\ ’ and ‘\~’ are converted to single space characters.

• The default tab distance in nroff mode is now 0.8i to be compatible with Unix troff.

• Using the latin-1 input character 0xAD (soft hyphen) for the ‘shc’ request was a bad idea. Instead, it is now translated to ‘\%’, and the default hyphenation character is again \[hy]. Note that the glyph \[shc] is not useful for typographic purposes; it only exists to have glyph names for all latin-1 characters.

Macro Packages

• Peter Schaffter has contributed a new major macro package called ‘mom’, mainly for non-scientific writers, which takes care of many typographic issues. It comes with a complete reference (in HTML format) and some examples. ‘mom’ has been designed to format documents for PostScript output only.

• Two macros ‘AT’ (AT&T) and ‘UC’ (Univ. of California) have been added to the man macros for compatibility with older BSD releases.

• Both the man and mdoc macro packages now use the LL and LT registers for setting the line and title length, respectively (similar to those registers in the ms macro package). If not set on the command line or in a macro file loaded before the macro package itself, they default to 78n in nroff mode and 6.5i in troff mode.

• The ‘−xwidth’ specifier in the mdoc macro package has been removed. Its functionality is now integrated directly into ‘−width’. Similarly, ‘−column’ has been extended to has this functionality also.

• A new macro ‘Ex’ has been added to the mdoc macro package to document an exit status.

• ‘troff.man’ has been split. Differences to Unix troff are now documented in the new man page ‘groff_diff.man’.

• The PSPIC macro has been extended to work with DVI output (‘pspic.tmac’ is now automatically loaded for −Tdvi), using a dvips special to load the EPS file.

• The trace.tmac package now traces calls to ‘am’ also. Additionally, it works in compatibility mode.

• ‘troff.1’ has been split. Differences to Unix troff are now documented in the new man page ‘groff_diff.7’.

• ‘groff_mwww.7’ has been renamed to ‘groff_www.7’. The file mwww.tmac has been removed.

• ‘groff_ms.7’ has been completely rewritten. It now contains a complete reference to the ms macros.

• ‘groff_trace.7’ documents the trace macro package.

• Changes in www.tmac

  Note that HTML support is still in alpha change, so it is rather likely that both macro names and macro syntax will change. Some of the macros mentioned below aren’t really new but haven’t been documented properly before.

  • The following macros have been renamed:

    MAILTO -> MTO
    IMAGE -> IMG
    LINE -> HR

  • For consistency, the macros ‘URL’, ‘FTL’, and ‘MTO’ now all have the address as the first parameter followed by the description.

  • By default, grohtml generates links to all section headings at the top of the document. Use the new ‘LK’ macro to specify a different place.

  • For specifying the background color and a background image, use the new macros ‘BCL’ and ‘BGIMG’, respectively.

  • The macro ‘NHR’ has been added; it suppresses the generation of top and bottom rules which grohtml emits by default.

  • The new macro ‘HX’ determines the cut-off point for automatic link generation to headings.

  • The image position parameter names in ‘IMG’ have been changed to ‘−L’, ‘−R’, and ‘−C’.

  • New macro ‘PIMG’ for inclusion of a PNG image (it automatically converts it into an EPS file if not −Thtml is used).

  • New macro ‘MPIMG’ for putting a PNG image into the left or right margin (it automatically converts it into an EPS file if not −Thtml is used).

  • New macros ‘HnS’, ‘HnE’ to start and end a header line block.

  • New macro ‘DC’ to produce dropcap characters.

  • New macro ‘HTL’ to generate an HTML title line only but no H1 heading.

  • New macros ‘ULS’ and ‘ULE’ to start and end an unordered list. The new macro ‘LI’ inserts a list item.

groff

• The new command-line option ‘−c’ disables color output (which is always disabled in compatibility mode).

Nroff

• Two new command-line options ‘−c’ and ‘−C’; the former passes ‘−c’ to grotty (switching to the old output scheme); the latter passes ‘−C’ to groff (enabling compatibility mode).

pic

• New keywords ‘color’ (or ‘colour’, ‘colored’, ‘coloured’), ‘outline’ (or ‘outlined’), and ‘shaded’ are available. ‘outline’ sets the color of the outline, ‘shaded’ the fill color, and ‘color’ sets both. Example:

  circle shaded "green" outline "black" ;

  Filled arrows always use the outline color for filling.

  Color support for TeX output is not implemented yet.

Pic2graph

• A new script contributed by Eric S. Raymond. It converts a PIC diagram into a cropped image. Since it uses gs and the PNM library, virtually all graphics formats are available for output.

Eqn2graph

• A new script contributed by Eric S. Raymond. It converts an EQN diagram into a cropped image. Since it uses gs and the PNM library, virtually all graphics formats are available for output.

Groffer

• A new script contributed by Bernd Warken. It displays groff files and man pages on X and tty, taking care of most parameters automatically.

Grog

• Documents using the mom macro package are recognized.

grops

• Color support has been added.

• A new option ‘−p’ is available to select the output paper size. It has the same syntax as the new ‘papersize’ keyword in the DESC file.

Grodvi

• By default, font sizes are now available in the range 5−10000pt, similar to PS fonts. If you want the old behaviour (i.e., font sizes at discrete values only), insert the following at the start of your document:

  .if ’\*[.T]’dvi’ \
  .  sizes 500 600 700 800 900 1000 1095 1200 1400 1440 1600 \
           1728 1800 2000 2074 2200 2400 2488 2800 3600

• A new font file HBI (using cmssbxo10; this is slanted sans serif bold extended) has been added.

• Two font families are now available: ‘T’ and ‘H’.

• EC and TC fonts have been integrated. Use ‘−mec’ (calling the file ec.tmac) to switch to them. Those fonts give a much better coverage of the symbols defined by groff than the CM fonts.

  Note that ec.tmac must be called before any language-specific files; it doesn’t take care of hcode values.

• Color support has been added. For drawing commands, colors are translated to gray values currently.

Grotty

• Color support has been added, using the SGR (ISO 6429, sometimes called ANSI color) escape sequences.

• SGR escape sequences are now used by default for underlining and bold printing also, no longer using the backspace character trick. To revert to the old behaviour, use the ‘−c’ switch.

  Note that you have to use the ‘−R’ option of ‘less’ to make SGR escapes display correctly. On the other hand, terminal programs and consoles like ‘xterm’ which support SGR sequences natively can directly display the output of grotty. Consequently, the options ‘−b’, ‘−B’, ‘−u’, and ‘−U’ work only in combination with ‘−c’ and are ignored silently otherwise.

  For the ‘man’ program, it may be necessary to add the ‘−R’ option of ‘less’ to the $PAGER environment variable (or $MANPAGER, depending on the used version of ‘man’); alternatively, you can use ‘man’s ‘−P’ option (or adapt its configuration file accordingly). See man(1) for more details.

• If the environment variable GROFF_NO_SGR is set, SGR output is disabled, reverting to the old behaviour.

• A new special \X’tty: sgr n’ has been added; if n is non-zero or missing, enable SGR output (the default).

• If the new option ‘−i’ is used (only in SGR mode), grotty sends escape sequences to set the italic font attribute instead of the underline attribute for italic fonts. Note that many terminals don’t have support for this (including xterm).

grohtml

• Color support for glyphs has been added.

• New option ‘−h’ to select the style of headings in HTML output.

• New option ‘−b’ to set the background colour to white.

• New options ‘−a’ and ‘−g’ to control the number of bits for anti-aliasing used for text and graphics, respectively. Default value is 4; 0 means no anti-aliasing.

• groff character/glyph entities now map onto HTML 4 character entities.

Grolbp

• Valid paper sizes are now specified as with the new ‘papersize’ keyword in the DESC file. Specifically, the old custom paper type format ‘custAAAxBBB’ is no longer supported.

Miscellaneous

• A new manual page ‘ditroff.7’ is available.

• The groff texinfo manual is now installed, together with a bunch of examples.

• A new keyword ‘papersize’ has been added to the DESC file format. Its argument is either

  • a predefined paper format (e.g. ‘A4’ or ‘letter’)

  • a file name pointing to a file which must contain a paper size specification in its first line (e.g. ‘/etc/papersize’)

  • a custom paper size definition like ‘35c,4i’

  See groff_font(5) for more details. This keyword only affects the physical dimensions of the output medium; grops, grolj4, and grolbp use it currently. troff completely ignores it.