grohtml(1)
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.
FILES
grohtml uses temporary files. See the groff(1) man page for details where such files are created.
ENVIRONMENT
GROFF_FONT_PATH
A list of directories in which to search for the devname
directory in addition to the default ones. See troff(1) and
groff_font(5) for more details.
SOURCE_DATE_EPOCH
A timestamp (expressed as seconds since the Unix epoch) to use
as the creation timestamp in place of the current time.
BUGS
Grohtml has been completely redesigned and rewritten. It is still beta code.
SEE ALSO
afmtodit(1), groff(1), troff(1), psbb(1), groff_out(5), groff_font(5), groff_char(7)
LICENSE
Copyright 1999-2014 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be included in translations approved by the Free Software Foundation instead of in the original English.
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