Tex4ht outputs a script file (`.lg
') describing how the dvi file (extension `.idv
') of pictures should
be processed, the CSS instructions to be included for the file, and user-initiated requests from the
operating system. In the default setting, the script file holds abstract commands similar to the following
ones.
t4ht
is in essence an interpreter for these abstract commands.
Another possible approach for automating the process is to request lg scripts in the form of shell scripts or batch files.
Alternatives to `--- needs --- source.idv[i] ==> target.gif ---'
The default setting is made with a request of the form `--- needs --- %%1.idv[%%2] ==> %%3.gif ---
',
where the parameters %%1
, %%2
, and %%3
respectively represent the name of the source file without
its extension, a page number, and a name of the target file. Alternative patterns to these abstract
commands can be requested in the following locations, with the order reflecting on the priority given to the
requests.
tex4ht
, where the pattern should be prefixed with `-s
'.
tex4ht.env
within a block of consecutive lines, where the lines should be identified with the
character `s
'.
tex4ht
with the pattern provided through the variable LGPIC of tex4ht.c
.
%
' can be introduced into a pattern through the entry `%%%
'. On the other hand, the
parameters `%%1
', `%%2
', and %%3
can specify, between the first two percentage characters (i.e., `%...%1
',
`%...%2
', and `%...%3
'), any format for the outcome that is compatible with the print formats of
C.
Alternatives to `--- characters ---'
Substitutions for this abstract command can be requested in the following locations.
tex4ht
, prefixed with `-b
'.
tex4ht.file
', where the line should be identified with the character
`b'.
tex4ht
with the substitution provided during compilation time through the variable LGSEP of
tex4ht.c
.