.TH GROFF_WWW 7 "11 October 2002" "Groff Version 1.19"
.\" Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.
.\"      Written by Gaius Mulley (gaius@glam.ac.uk)
.\"
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.\"
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.\" with groff; see the file COPYING.  If not, write to the Free Software
.\" Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
.\"
.\" user level guide to using the -mwww macroset
.\"
.
.do mso www.tmac
.
.\" we need the .LK here as we use it in the middle as an example --
.\" once the user requests .LK then the automatic generation of links
.\" at the top of the document is suppressed.
.LK
.
.
.SH NAME
groff_www \- groff macros for authoring web pages
.HR
.SH SYNOPSIS
.B "groff \-mwww"
[ options ]
file ...
.
.
.SH DESCRIPTION
This manual page describes the GNU \-mwww macro package, which is part of
the groff document formatting system.
The manual page is very a basic guide, and the html device driver
.RB ( grohtml )
has been completely rewritten but still remains as in an alpha state.
It has been included into the distribution so that a lot of people have a
chance to test it.
Note that this macro file will be automatically called (via the
.B troffrc
file) if you use
.BR \-Thtml .
.PP
To see the hyperlinks in action, please format this man page with the
.B grohtml
device.
.PP
Here is a summary of the functions found in this macro set.
.ta 2iL
.nf
\&.HX	automatic heading level cut off;
	$1 point for sections/headers
\&.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 a html email address
\&.FTP	create an ftp reference
\&.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
\&.ULS	unorder list begin
\&.ULE	unorder list end
\&.LI	insert a list item
\&.DC	generate a drop capital
\&.HTML	pass an html raw request to the
	device driver
.fi
.PP
Output of the
.BR pic ,
.BR eqn ,
.BR refer ,
and
.B tbl
preprocessors is acceptable as input.
.
.
.SH REQUESTS
.TP
.B HX
Specify the cut off depth when generating links from section headings.
For example, a parameter of\~2 would cause
.B grohtml
to generate a list of links for
.B .NH\ 1
and
.B .NH\ 2
but not for
.BR .NH\ 3 .
Whereas
.RS
.IP
.nf
.B .HX 0
.fi
.RE
.IP
will tell
.B grohtml
that no heading links should be created at all.
Another method for turning automatic headings off is by issuing the
the command line switch
.B \-P\-l
to
.BR groff .
.
.TP
.B BCL
This macro takes five parameters: foreground, background, active hypertext
link, hypertext link not yet visited, and visited hypertext link colour.
.
.TP
.B BGIMG
the only parameter to this macro is the background image file.
.
.TP
.B URL
generates
.TAG URL
a URL using either 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.
Hyphenation is disabled while printing the actual URL; explicit breakpoints
should be inserted with the
.B \[rs]:
escape.
Here is how to encode
.URL http://\:foo.\:org/ "foo" :
.RS
.IP
.B .URL http://\[rs]:foo.\[rs]:org/ "foo" :
.RE
.IP
If this is processed by a device other than 
.B \-Thtml
it appears as:
.RS
.IP
\m[blue]foo\m[] \[la]\f[C]http://foo.org\f[]\[ra]:
.RE
.IP
The URL macro can be of any type; for example we can reference
.URL pic.html "Eric Raymond's pic guide" 
by:
.RS
.IP
.B .URL pic.html \[dq]Eric Raymond's pic guide\[dq]
.RE
.
.TP
.B MTO
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, and
an optional third argument is stuff printed immediately afterwards.
Hyphenation is disabled while printing the actual email address.
For example, 
.MTO joe@user.org "Joe User"
was achieved by the following macro:
.RS
.IP
.B .MTO joe@user.org \[dq]Joe User\[dq]
.RE
.IP
Note that all the URLs actually are treated as consuming no textual space
in groff.
This could be considered as a bug since it causes some problems.
To circumvent this,
.B www.tmac
inserts a zero-width character which expands to a harmless space (only if
run with
.BR \-Thtml ).
.
.TP
.B FTP
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 the location of the
.FTP ftp://\:ftp.gnu.org/ "GNU ftp server" .
The macro example above was specified by:
.RS
.IP
.B .FTP ftp://\[rs]:ftp.gnu.org/ \[dq]GNU ftp server\[dq] .
.RE
.
.TP
.B TAG
Generates an html name tag from its argument.
This can then be referenced using the
.URL #URL URL
macro.
As you can see, you must precede the tag name with
.B #
since it is a local reference.
This link was achieved via placing a TAG in the URL description above;
the source looks like this:
.RS
.IP
.nf
.ft B
\&.TP
\&.B URL
generates
\&.TAG URL
a URL using either two or three arguments.
\&.\|.\|.
.fi
.ft P
.RE
.
.TP
.B IMG
Include a picture into the document.
The first argument is the horizontal location: right, left, or center
.RB ( \-R ,
.BR \-L ,
or
.BR \-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
.B PIMG
macro.
.
.TP
.B PIMG
Include an image in PNG format.
This macro takes exactly the same parameters as the
.B 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
.B netpbm
package:
.BR pngtopnm ,
.BR pnmcrop ,
and
.BR pnmtops .
If the document isn't processed with
.B \-Thtml
it is necessary to use the
.B \-U
option of groff.
.
.TP
.B MPIMG
Place a PNG image on the margin and wrap text around it.
The first parameter is the alignment: left or right
.RB ( \-L
or
.BR \-R ).
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.
.
.TP
.B HnS
Begin heading.
The heading level is specified by the first parameter.
Use this macro of your headings contain URLs.
Example:
.RS
.IP
.nf
.ft B
\&.HnS 1
\&.HR
GNU Troff
\&.URL http://groff.ffii.org (Groff) 
\&\(em a
\&.URL http://www.gnu.org/ GNU
\&project.
\&Hosted by
\&.URL http://ffii.org/ FFII .
\&.HR
\&.HnE
.ft P
.fi
.RE
.
.TP
.B HnE
End heading.
.
.TP
.B LK
.TAG LK
Force grohtml to place the automatically generated links at this position.
If this manual page has been processed with
.B \-Thtml
those links can be seen right here.
.
.LK
.
.
.SH SECTION HEADING LINKS
By default
.B grohtml
generates links to all section headings and places these at the top of the
html document. (See
.URL #LK LINKS
for details of how to switch this off or alter the position).
.
.TP
.B HR
Generate a full-width horizontal rule.
.
.TP
.B NHR
Suppress generation of the top and bottom rules which grohtml emits
by default.
.
.TP
.B HTL
Generate an HTML title only.
This differs from the 
.B TL
macro of the
.B 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.
.
.TP
.B HTML
All text after this macro is treated as raw html.
If the document is processed without
.B \-Thtml
then the macro is ignored.
Internally, this macro is used as a building block for other higher-level
macros.
.IP
For example, the
.B BGIMG
macro is defined as
.RS
.IP
.nf
.ft B
\&.de BGIMG
\&.   HTML <body background=\[rs]$1>
\&..
.ft P
.fi
.RE
.
.TP
.B DC
Produce a drop capital.
The first parameter is the letter to be dropped and enlarged, the second
parameter is the ajoining text whose height the first letter should not
exceed.
The optional third parameter is the color of the dropped letter.
.
.
.SH LIMITATIONS OF GROHTML
.LP
.B tbl
information is currently rendered as a PNG image.
.
.
.SH FILES
/usr/share/tmac/www.tmac
.
.
.SH "SEE ALSO"
.BR groff (1),
.BR troff (1)
.BR grohtml (1),
.BR netpbm (1)
.
.
.SH AUTHOR
.B grohtml
was written by
.MTO gaius@glam.ac.uk "Gaius Mulley"
.
.
.SH BUGS
Report bugs to the
.MTO bug-groff@\:gnu.org "Groff Bug Mailing List" .
Include a complete, self-contained example that will allow the bug to be
reproduced, and say which version of groff you are using.
.
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