[MTT users] &if funclet and quoting

[Ethan Mallove]

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Question 1:
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I have the below "exec" and "btls" params in my INI, but I
keep running into quoting issues. I'm trying to get an
if-else effect by putting the else block in as the third
argument to the &if() function, and I can't seem to manage
the levels of nested quoting. I keep getting bareword errors
(which is due to an incorrect number of wrapped quotes).
What am I doing wrong?

exec = mpirun --mca btl @btls@ @hosts@ -np &test_np() --prefix &test_prefix() 
&test_executable() &test_argv()

btls = &if("&regexp("&shell("hostname")", "v440-2|v20z-2")", \
           "&enumerate("self,sm,tcp")", \
           "&if("&regexp("&shell("hostname")", "v440-6")", \
               "&enumerate("udapl")", \
               "&enumerate("sm", "tcp", "sm,tcp", "udapl", "sm,udapl")"" \
           ) \
       )

(The idea here is to use a different "--mca btl" option on
different clusters.)

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Question 2:
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How come EvaluateString() doesn't translate this:

btls = &if("&regexp("&shell("hostname")", "v440-2|v20z-2")", \
           "&enumerate("self,sm,tcp")", \
           "&if("&regexp("&shell("hostname")", "v440-6")", \
               "&enumerate("udapl")", \
               "&enumerate("sm", "tcp", "sm,tcp", "udapl", "sm,udapl")"" \
           ) \
       )

Into one big eval block like this:

eval $btls = 
MTT::Functions::if(MTT::Functions::regexp(MTT::Functions::shell("hostname"), 
"v440-2|v20z-2"),
                 MTT::Functions::enumerate("self,sm,tcp"),
                 
MTT::Functions::if("MTT::Functions::regexp("MTT::Functions::shell("hostname"), 
"v440-6"),
                     MTT::Functions::enumerate("udapl"),
                     MTT::Functions::enumerate("sm", "tcp", "sm,tcp", "udapl", 
"sm,udapl")
                 )
     )

So we could put the burden of the nasty recursive
parenthesis/quote parsing on perl, rather than MTT. That
would seem to naturally make the INI funclet syntax more
Perl-like.

-Ethan