[Scilab-users] unix_w(WSCI+"\bin\scilex --help") returns nothing

[Samuel Gougeon]

Le 30/10/2019 à 02:33, Chin Luh Tan a écrit :
> Hi Samuel,
>
> I think we could use this instead:
>
> unix_w("Scilex --help  2>&1")
>
>
> As you mentioned, the "--help" is Scilab 6 dedicated "hardcoded" 
> function, I am yet to look for where is it located from the source, if 
> anyone find out, please share here :).
>
> For some reason, the output message seems  to have sent to stderr(2) 
> instead of stdout(1), so we have to redirect it back to stdout for the 
> unix_? to capture it.

The whole thing is to know which reason. Clearly,  std::cerr is 
intentionally targeted,
in the source file \scilab\modules\startup\src\cpp\scilab.cpp:
static void usage(void)
{
     std::cerr << "Usage: Scilab <options>" << std::endl;
     std::cerr << "      -e Instruction   : execute the scilab 
instruction given in Instruction argument." << std::endl;
     std::cerr << "                         -e and -f arguments are 
mutually exclusive." << std::endl;
     std::cerr << "      -f File          : execute the scilab script 
given in File argument." << std::endl;
     std::cerr << "                         -e and -f arguments are 
mutually exclusive." << std::endl;
     std::cerr << "      -quit            : force scilab exit after 
execution of script from -e or -f argument." << std::endl;
     std::cerr << "                         this flag is ignored if it 
is not used with -e or -f argument." << std::endl;
     std::cerr << "      -l lang          : Change the language of 
scilab ( default : en_US )." << std::endl;
     std::cerr << "      -nw              : Enable console mode." << 
std::endl;
     std::cerr << "      -nwni            : Enable terminal mode." << 
std::endl;
     std::cerr << "      -ns              : Don't execute 
etc/scilab.start." << std::endl;
     std::cerr << "      --help           : Display this help." << 
std::endl;
     std::cerr << "      -scihome <dir>   : Force SCIHOME to <dir>." << 
std::endl;
     std::cerr << "Developer Trace arguments:" << std::endl;
     std::cerr << "      --parse-trace    : Display bison state machine 
evolution." << std::endl;
     std::cerr << "      --AST-trace      : Display ASCII-art AST to be 
human readable." << std::endl;
     std::cerr << "      --pretty-print   : Display pretty-printed code, 
standard Scilab syntax." << std::endl;
     std::cerr << " " << std::endl;
     std::cerr << "Developer Timer arguments:" << std::endl;
     std::cerr << "      --AST-timed      : Time each AST node." << 
std::endl;
     std::cerr << "      --timed          : Time global execution." << 
std::endl;
     std::cerr << " " << std::endl;
     std::cerr << "Developer Debug arguments:" << std::endl;
     std::cerr << "      --no-exec        : Only do Lexing/parsing do 
not execute instructions." << std::endl;
     std::cerr << "      --context-dump   : Display context status." << 
std::endl;
     std::cerr << "      --exec-verbose   : Display command before 
running it." << std::endl;
     std::cerr << "      --timeout delay  : Kill the Scilab process 
after a delay." << std::endl;
}

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