Next: Conditional Not Commands, Up: Conditionals
Texinfo has an @ifformat environment for each output
format, to allow conditional inclusion of text for a particular output
format.
@ifinfo begins segments of text that should be ignored by
TeX when it typesets the printed manual, and by makeinfo
when not producing Info output. The segment of text appears only in
the Info file and, for historical compatibility, the plain text
output.
The environments for the other formats are analogous:
@ifdocbook ... @end ifdocbook@ifhtml ... @end ifhtml@ifplaintext ... @end ifplaintext@iftex ... @end iftex@ifxml ... @end ifxmlThe @if... and @end if... commands must appear
on lines by themselves in your source file.
Here is an example showing all these conditionals:
@iftex
This text will appear only in the printed manual.
@end iftex
@ifinfo
However, this text will appear only in Info and plain text.
@end ifinfo
@ifhtml
And this text will only appear in HTML.
@end ifhtml
@ifplaintext
Whereas this text will only appear in plain text.
@end ifplaintext
@ifxml
Notwithstanding that this will only appear in XML.
@end ifxml
@ifdocbook
Nevertheless, this will only appear in Docbook.
@end ifdocbook
The preceding example produces the following line:
And this text will only appear in HTML.
Notice that you only see one of the input lines, depending on which version of the manual you are reading.