Learning NAnt - what does [+|-] in the help mean?

Question

If I type nant -help I receive help information about the various command-line options.

Some, such as find have a suffix of [+|-], e.g.

-find[+|-]                     Search parent directories for build file

What does the [+|-] mean?

Answer 1

According to the source code, find is a boolean type, and adding + or - simply sets it to true or false accordingly. I suppose the - is useful to override a previous setting, don't know why you'd want to have an explicit + though.