Ubuntu Manpage: groff_www - GNU roff macros for authoring web pages

Name

       groff_www - GNU roff macros for authoring web pages

Synopsis

       groff -m www [option ...] [file ...]

Description

       This  manual  page describes the GNU www macro package, which is part of the groff(7) document formatting
       system.  This macro file is automatically loaded by the default troffrc file when the formatter  (usually
       groff(1))  is  called  with either of the options -Thtml or -Txhtml.  To see hyperlinks in action, format
       this man page using one of those options.

       This document is a basic guide; the HTML output driver (grohtml) remains in an alpha state.  It has  been
       included with the distribution to encourage testing.

       Here is a summary of the functions found in this macro set.

       .JOBNAME     split output into multiple files
       .HX          automatic heading level cut off
       .BCL         specify colours on a web page
       .BGIMG       specify background image
       .URL         create a URL using two parameters
       .FTP         create an FTP reference
       .MTO         create an HTML email address
       .TAG         generate an HTML name
       .IMG         include an image file
       .PIMG        include PNG image
       .MPIMG       place PNG on the margin and wrap text around it
       .HnS         begin heading
       .HnE         end heading
       .LK          emit automatically collected links.
       .HR          produce a horizontal rule
       .NHR         suppress automatic generation of rules.
       .HTL         only generate HTML title
       .HEAD        add data to <head> block
       .ULS         unorder list begin
       .ULE         unorder list end
       .OLS         ordered list begin
       .OLE         ordered list end
       .DLS         definition list begin
       .DLE         definition list end
       .LI          insert a list item
       .DC          generate a drop capital
       .HTML        pass an HTML raw request to the device driver
       .CDS         code example begin
       .CDE         code example end
       .ALN         place links on left of main text.
       .LNS         start a new two-column table with links in the left.
       .LNE         end the two-column table.
       .LINKSTYLE   initialize default URL attributes.

Macros

.JOBNAME filename
Split output into multiple HTML files. A file is split whenever a .SH or .NH 1 is encountered.
Its argument is the file stem name for future output files. This option is equivalent to
grohtml's -j option.

.HX n Specify the cut off depth when generating links from section headings. For example, a parameter
of 2 would cause grohtml to generate a list of links for .NH 1 and .NH 2 but not for .NH 3.
Whereas

.HX 0

tells grohtml that no heading links should be created at all. Another method for turning
automatic headings off is by issuing the command-line switch -P-l to groff.

.BCL foreground background active not-visited visited
This macro takes five parameters: foreground, background, active hypertext link, hypertext link
not yet visited, and visited hypertext link colour.

.BGIMG imagefile
the only parameter to this macro is the background image file.

.URL url [description] [after]
generates a URL using either one, two, or three arguments. The first parameter is the actual URL,
the second is the name of the link, and the third is optional stuff to be printed immediately
afterwards. If description and after are absent then the URL becomes the anchor text.
Hyphenation is disabled while printing the actual URL; explicit breakpoints should be inserted
with the \: escape sequence. Here is how to encode foo ⟨http://foo.org/⟩:

.URL http://\:foo\:.org/ foo :

If this is processed by a device other than -Thtml or -Txhtml it appears as:

foo ⟨http://foo.org⟩:

The URL macro can be of any type; for example, we can reference Eric Raymond's pic guide ⟨pic
.html⟩ by:

.URL pic\:.html "Eric Raymond's pic guide"

.MTO address [description] [after]
Generate an email HTML reference. The first argument is mandatory as the email address. The
optional second argument is the text you see in your browser. If an empty argument is given,
address is used instead. An optional third argument is stuff printed immediately afterwards.
Hyphenation is disabled while printing the actual email address. For example, Joe User ⟨joe@user
.org⟩ can be achieved by the following macro:

.MTO joe@user.org "Joe User"

All URLs currently are treated as consuming no textual space in groff. This could be considered
as a bug since it causes some problems. To circumvent this, www.tmac inserts a zero-width
character which expands to a harmless space (only if run with -Thtml or -Txhtml).

.FTP url [description] [after]
indicates that data can be obtained via FTP. The first argument is the URL and the second is the
browser text. A third argument, similar to the macros above, is intended for stuff printed
immediately afterwards. The second and the third parameter are optional. Hyphenation is disabled
while printing the actual URL. As an example, here is the location of the GNU FTP server ⟨ftp://
ftp.gnu.org/⟩. The macro example above can be specified as:

.FTP ftp://\:ftp\:.gnu\:.org/ "GNU FTP server" .

.TAG name
Generates an HTML name tag from its argument. This can then be referenced using the URL ⟨#URL⟩
macro. As you can see, you must precede the tag name with # since it is a local reference. This
link was achieved via placing a TAG in the URL description above; the source looks like this:

.TP
.B URL
generates
.TAG URL
a URL using either two or three arguments.
...

.IMG [-R|-L|-C] filename [width] [height]
Include a picture into the document. The first argument is the horizontal location: right, left,
or center (-R, -L, or -C). Alignment is centered by default (-C). The second argument is the
filename. The optional third and fourth arguments are the width and height. If the width is
absent it defaults to 1 inch. If the height is absent it defaults to the width. This maps onto
an HTML img tag. If you are including a PNG image then it is advisable to use the PIMG macro.

.PIMG [-R|-L|-C] filename [width [height]]
Include an image in PNG format. This macro takes exactly the same parameters as the IMG macro; it
has the advantage of working with PostScript and HTML devices also since it can automatically
convert the image into the EPS format, using the following programs of the netpbm package:
pngtopnm, pnmcrop, and pnmtops. If the document isn't processed with -Thtml or -Txhtml it is
necessary to use the -U option of groff.

.MPIMG [-R|-L] [-G gap] filename [width [height]]
Place a PNG image on the margin and wrap text around it. The first parameters are optional. The
alignment: left or right (-L or -R) specifies the margin where the picture is placed at. The
default alignment is left (-L). Optionally, -G gap can be used to arrange a gap between the
picture and the text that wraps around it. The default gap width is zero.
The first non-optional argument is the filename. The optional following arguments are the width
and height. If the width is absent it defaults to 1 inch. If the height is absent it defaults to
the width. Example:

.MPIMG -L -G 2c foo.png 3c 1.5c

The height and width may also be given as percentages. The PostScript device calculates the width
from the .l register and the height from the .p register. For example:

.MPIMG -L -G 2c foo.png 15%

.HnS n Begin heading. The numeric heading level n is specified by the first parameter. Use this macro
if your headings contain URL, FTP or MTO macros. Example:

.HnS 1
.HR
GNU Troff
.URL https://\:www\:.gnu\:.org/\:software/\:groff/
\[em]a
.URL http://www\:.gnu\:.org/ GNU
project.
.HR
.HnE

In this case you might wish to disable automatic links to headings. This can be done via -P-l
from the command line.

.HnE End heading.

.LK Force grohtml to place the automatically generated links at this position.

.HR Generate a full-width horizontal rule for -Thtml and -Txhtml. No effect for all other devices.

.NHR Suppress generation of the top and bottom rules which grohtml emits by default.

.HTL Generate an HTML title only. This differs from the TL macro of the ms macro package which
generates both an HTML title and an <H1> heading. Use it to provide an HTML title as search
engine fodder but a graphic title in the document. The macro terminates when a space or break is
seen (.sp, .br).

.HEAD Add arbitrary HTML data to the <head> block. Ignored if not processed with -Thtml or -Txhtml.
Example:

.HEAD "<link \
rel=""icon"" \
type=""image/png"" \
href=""http://foo.org//bar.png""/>"

.HTML All text after this macro is treated as raw HTML. If the document is processed without -Thtml or
-Txhtml then the macro is ignored. Internally, this macro is used as a building block for other
higher-level macros.

For example, the BGIMG macro is defined as

.de BGIMG
. HTML <body background=\\$1>
..

.DC l text [color]
Produce a drop capital. The first parameter is the letter to be dropped and enlarged, the second
parameter text is the adjoining text whose height the first letter should not exceed. The
optional third parameter is the color of the dropped letter. It defaults to black.

.CDS Start displaying a code section in constant width font.

.CDE End code display

.ALN [color] [percentage]
Place section heading links automatically to the left of the main text. The color argument is
optional and if present indicates which HTML background color is to be used under the links. The
optional percentage indicates the amount of width to devote to displaying the links. The default
values are #eeeeee and 30 for color and percentage width, respectively. This macro should only be
called once at the beginning of the document. After calling this macro each section heading emits
an HTML table consisting of the links in the left and the section text on the right.

.LNS Start a new two-column table with links in the left column. This can be called if the document
has text before the first .SH and if .ALN is used. Typically this is called just before the first
paragraph and after the main title as it indicates that text after this point should be positioned
to the right of the left-hand navigational links.

.LNE End a two-column table. This should be called at the end of the document if .ALN was used.

.LINKSTYLE color [ fontstyle [ openglyph closeglyph ] ]
Initialize default URL attributes to be used if this macro set is not used with the HTML device.
The macro set initializes itself with the following call

.LINKSTYLE blue CR \[la] \[ra]

but these values will be superseded by a user call to LINKSTYLE.

Section heading links

       By  default  grohtml  generates  links  to  all  section headings and places these at the top of the HTML
       document.  (See LINKS ⟨#LK⟩ for details of how to switch this off or alter the position).

Limitations of grohtml
       tbl(1) tables are rendered as PNG images.  Paul DuBois's approach with tblcvt(1), part  of  the  troffcvt
       distribution ⟨http://www.snake.net/software/troffcvt/⟩, should be explored.

Files

       /usr/share/groff/1.23.0/tmac/www.tmac

Authors

       The  www  macro  package was written by Gaius Mulley ⟨gaius@glam.ac.uk⟩, with additions by Werner Lemberg
       ⟨wl@gnu.org⟩ and Bernd Warken ⟨groff-bernd.warken-72@web.de⟩.