1GROHTML(1)                  General Commands Manual                 GROHTML(1)
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NAME

6       grohtml - HTML driver for groff
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SYNOPSIS

9       grohtml [-bhlnprVy] [-a aa-text-bits] [-D dir] [-F dir] [-g aa-graphic-
10               bits] [-i resolution] [-I image-stem] [-j filename] [-o image-
11               vertical-offset] [-s size] [-S level] [-x html-dialect] [file
12               ...]
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14       grohtml --help
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16       grohtml -v
17       grohtml --version
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DESCRIPTION

20       The grohtml front end (which consists of a  preprocessor,  pre-grohtml,
21       and  a  device driver, post-grohtml) translates the output of GNU troff
22       to HTML.  Users should always invoke grohtml via the groff command with
23       a -Thtml option.  If no files are given, grohtml will read the standard
24       input.  A filename of - will also cause grohtml to  read  the  standard
25       input.  Html output is written to the standard output.  When grohtml is
26       run by groff options can be passed to grohtml using groff's -P option.
27
28       grohtml invokes groff twice.  In the first pass,  pictures,  equations,
29       and  tables  are  rendered  using the ps device, and in the second pass
30       HTML output is generated by the html device.
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32       grohtml always writes output in UTF-8 encoding and has  built-in  enti‐
33       ties for all non-composite unicode characters.  In spite of this, groff
34       may issue warnings about unknown special characters if  they  can't  be
35       found  during  the first pass.  Such warnings can be safely ignored un‐
36       less the special characters appear inside a table or equation.
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OPTIONS

39       -aaa-text-bits
40              Number of bits of antialiasing information to be  used  by  text
41              when  generating  PNG images.  The default is 4 but valid values
42              are 0, 1, 2, and 4.  Note your version of gs  needs  to  support
43              the  -dTextAlphaBits  and -dGraphicAlphaBits options in order to
44              exploit antialiasing.  A value of 0 stops grohtml  from  issuing
45              antialiasing commands to gs.
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47       -b     Initialize the background color to white.
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49       -Ddir  Inform grohtml to place all image files into directory dir.
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51       -e     This  option should not be directly invoked by the user as it is
52              an internal option utilized by groff when -Thtml or  -Txhtml  is
53              specified.   It is used by the grohtml preprocessor to determine
54              whether eqn should attempt to  produce  MathML  (if  -Txhtml  is
55              specified).
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57       -Fdir  Prepend  directory  dir/devname  to the search path for font and
58              device description files; name is the name of the  device,  usu‐
59              ally html.
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61       -gaa-graphic-bits
62              Number  of bits of antialiasing information to be used by graph‐
63              ics when generating PNG images.  The default is 4 but valid val‐
64              ues  are  0, 1, 2, and 4.  Note your version of gs needs to sup‐
65              port the -dTextAlphaBits and -dGraphicAlphaBits options in order
66              to  exploit antialiasing.  A value of 0 stops grohtml from issu‐
67              ing antialiasing commands to gs.
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69       -h     Generate section and number headings by using <B>...</B> and in‐
70              creasing the font size, rather than using the <Hn>...</Hn> tags.
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72       -iresolution
73              Select  the  resolution  for all images.  By default this is 100
74              pixels per inch.  Example: -i200 indicates 200 pixels per inch.
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76       -Istem Determine  the  image  stem  name.   If  omitted  grohtml   uses
77              grohtml-XXX (XXX is the process ID).
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79       -jfilename
80              Inform  grohtml  to  split  the HTML output into multiple files.
81              The filename is the stem and specified section headings (default
82              is level one) start a new file, named filename-n.html.
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84       -l     Turn off the production of automatic section links at the top of
85              the document.
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87       -n     Generate simple heading anchors whenever a section/number  head‐
88              ing  is  found.  Without the option the anchor value is the tex‐
89              tual heading.  This can cause problems when a heading contains a
90              ‘?’a  on  older versions of some browsers (Netscape).  This flag
91              is automatically turned on if a heading contains an image.
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93       -overtical-offset
94              Specify the vertical offset of images in points.
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96       -p     Display page rendering progress to stderr.   grohtml  only  dis‐
97              plays a page number when an image is required.
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99       -r     Turn off the automatic header and footer line (HTML rule).
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101       -s size
102              Set  the  base  point  size of the source file.  Thereafter when
103              this point size is used in the source it will correspond to  the
104              HTML base size.  Every increase of two points in the source will
105              yield a <big> tag, and conversely when a decrease of two  points
106              is seen a <small> tag is emitted.
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108       -Slevel
109              When  splitting  HTML  output,  split  at  the heading level (or
110              higher) defined by level.
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112       -v     Print the version number.
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114       -V     Create an XHTML or HTML validator button at the bottom  of  each
115              page of the document.
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117       -xdialect
118              Select  HTML  dialect.   Currently, dialect should be either the
119              digit 4 or the letter x which indicates whether  grohtml  should
120              generate  HTML 4 or XHTML, respectively.  This option should not
121              be directly invoked by the user as it is an internal option uti‐
122              lized by groff when -Thtml or -Txhtml is specified.
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124       -y     Produce a right-justified groff signature at the end of the doc‐
125              ument.  This is only generated if the -V flag is also specified.
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USAGE

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

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

139       grohtml  uses  temporary  files.  See the groff(1) man page for details
140       where such files are created.
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ENVIRONMENT

143       GROFF_FONT_PATH
144              A list of directories in which to search for the devname  direc‐
145              tory  in  addition  to  the  default  ones.   See  troff(1)  and
146              groff_font(5) for more details.
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148       SOURCE_DATE_EPOCH
149              A timestamp (expressed as seconds since the Unix epoch)  to  use
150              as the creation timestamp in place of the current time.
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BUGS

153       Grohtml has been completely redesigned and rewritten.  It is still beta
154       code.
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SEE ALSO

157       afmtodit(1), groff(1), troff(1), psbb(1), groff_out(5),  groff_font(5),
158       groff_char(7)
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162groff 1.22.4                    20 January 2022                     GROHTML(1)
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