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PROGRAM:

NAME

grohtml - html driver for groff

SYNOPSIS

grohtml [ -bhlnprv ] [ -aaa-text-bits ] [ -Ddir ] [ -Fdir ] [ -gaa-graphic-bits ]
[ -iresolution ] [ -Iimage-stem ] [ -jfilename ] [ -oimage-vertical-offset ]
[ -ssize ] [ -Slevel ] [ -xhtml-dialect ] [ files... ]

DESCRIPTION

The grohtml front end (which consists of a preprocessor, pre-grohtml, and a device driver,
post-grohtml) translates the output of GNU troff to html. Users should always invoke
grohtml via the groff command with a -Thtml option. If no files are given, grohtml will
read the standard input. A filename of - will also cause grohtml to read the standard
input. Html output is written to the standard output. When grohtml is run by groff
options can be passed to grohtml using groff's -P option.

grohtml invokes groff twice. In the first pass, pictures, equations, and tables are
rendered using the ps device, and in the second pass HTML output is generated by the html
device.

grohtml always writes output in UTF-8 encoding and has built-in entities for all non-
composite unicode characters. In spite of this, groff may issue warnings about unknown
special characters if they can't be found during the first pass. Such warnings can be
safely ignored unless the special characters appear inside a table or equation.

OPTIONS

-aaa-text-bits
Number of bits of antialiasing information to be used by text when generating png
images. The default is 4 but valid values are 0, 1, 2, and 4. Note your version
of gs needs to support the -dTextAlphaBits and -dGraphicAlphaBits options in order
to exploit antialiasing. A value of 0 stops grohtml from issuing antialiasing
commands to gs.

-b Initialize the background color to white.

-Ddir Inform grohtml to place all image files into directory dir.

-e This option should not be directly invoked by the user as it is an internal option
utilized by groff when -Thtml or -Txhtml is specified. It is used by the grohtml
preprocessor to determine whether eqn should attempt to produce MathML (if -Txhtml
is specified).

-Fdir Prepend directory dir/devname to the search path for font and device description
files; name is the name of the device, usually html.

-gaa-graphic-bits
Number of bits of antialiasing information to be used by graphics when generating
png images. The default is 4 but valid values are 0, 1, 2, and 4. Note your
version of gs needs to support the -dTextAlphaBits and -dGraphicAlphaBits options
in order to exploit antialiasing. A value of 0 stops grohtml from issuing
antialiasing commands to gs.

-h Generate section and number headings by using <B>...</B> and increasing the font
size, rather than using the <Hn>...</Hn> tags.

-iresolution
Select the resolution for all images. By default this is 100 pixels per inch.
Example: -i200 indicates 200 pixels per inch.

-Istem Determine the image stem name. If omitted grohtml uses grohtml-XXX (XXX is the
process ID).

-jfilename
Inform grohtml to split the html output into multiple files. The filename is the
stem and specified section headings (default is level one) start a new file, named
filename-n.html.

-l Turn off the production of automatic section links at the top of the document.

-n Generate simple heading anchors whenever a section/number heading is found.
Without the option the anchor value is the textual heading. This can cause
problems when a heading contains a ‘?’ on older versions of some browsers
(Netscape). This flag is automatically turned on if a heading contains an image.

-overtical-offset
Specify the vertical offset of images in points.

-p Display page rendering progress to stderr. grohtml only displays a page number
when an image is required.

-r Turn off the automatic header and footer line (html rule).

-s size
Set the base point size of the source file. Thereafter when this point size is
used in the source it will correspond to the html base size. Every increase of two
points in the source will yield a <big> tag, and conversely when a decrease of two
points is seen a <small> tag is emitted.

-Slevel
When splitting html output, split at the heading level (or higher) defined by
level.

-v Print the version number.

-V Create an XHTML or HTML validator button at the bottom of each page of the
document.

-xdialect
Select HTML dialect. Currently, dialect should be either the digit 4 or the
letter x which indicates whether grohtml should generate HTML 4 or XHTML,
respectively. This option should not be directly invoked by the user as it is an
internal option utilized by groff when -Thtml or -Txhtml is specified.

-y Produce a right-justified groff signature at the end of the document. This is only
generated if the -V flag is also specified.

USAGE

There are styles called R, I, B, and BI mounted at font positions 1 to 4.

DEPENDENCIES

grohtml is dependent upon the png utilities (pnmcut, pnmcrop, pnmtopng) and GhostScript
(gs). pnmtopng (version 2.37.6 or greater) and pnmcut from the netpbm package (version
9.16 or greater) will work also. It is also dependent upon psselect from the PSUtils
package. Images are generated whenever a table, picture, equation or line is encountered.

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