[CMake] How do I access the --extra-verbose option for ctest for my tests?

[Alan W. Irwin]

Assume that I have added a test with

add_test(testname myshell_script.sh arg1 arg2 ...)

Currently ctest with no --verbose or --extra-verbose options suppresses all
output from the script and ctest with either the --verbose or
--extra-verbose option allows all output from the script, i.e., the way I
have set up my script now there appears to be no difference between the
--verbose and --extra-verbose ctest options.

I would like more control over the verbosity from the script at ctest time.
I can do all the script side logic for that with the script verbosity
controlled by the script options (in reality called --verbose and
--extra-verbose, but to keep them distinct from the ctest options let's call
them --chatty and --chattier for the purposes of this question).  How do I
arrange for the --chatty option to be used when ctest is invoked with
--verbose and the --chattier option to be used when ctest is invoked with
--extra-verbose?

Alan
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Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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