[Pharo-project] New Command Line Behavior
Sven Van Caekenberghe
sven at beta9.be
Thu Jul 5 18:02:36 EDT 2012
On 05 Jul 2012, at 23:27, Camillo Bruni wrote:
> On 2012-07-05, at 21:36, Sven Van Caekenberghe wrote:
>> Hi (Camillo),
>> Is there some place that describes the new features of the command line ? ;-)
> If any place then the class comment of CommandLineHandler ;P
OK, got it.
>> I was just trying a bit right now (in Linux, latest VM, latest mage).
>> It seems that just starting an image with no args results in it reading an expression from stdin, right ? But I have to do a ctrl-d to end the input and have it evaluated and printed. And then the image quits, no repl loop ?
> There was an issue with that Guillermo reported, so for now this has been deactivated.
> You have to explicitly enable the 'eval' handler to read from pipe in.
> So far it will just try to read from stind unit it #atEnd returns true, I guess that is not
> fully compliant with the standard behavior of linux scripts :P
a basic --repl handler would be handy I guess
> REPL: I have a multiline history repl in alpha state:
> It currently needs some more documentation, but I guess I can make it go into the
> 2.0 default image next week or so, then people can start to give some feedback.
readline would be very nice indeed, although it is another dependency.
>> Also for the eval option, it does not work, unless I do a ctrl-d manually. You once posted this example:
>> ./bin/CogVM -vm-display-null -vm-sound-null Pharo-2.0.image eval '1+2'
>> Should it still work ?
> yes that should still work, either with 'eval' or '-e' à la ruby ;)
that is was my main point, it doesn't work.
always triies to read from stdin, so it needs a crtl-d to end, reading nothing, printing nil, only then will the args be evaluated as you describe.
It goes like
ubuntu at ip-10-48-234-254:~/pharo2$ ./bin/CogVM -vm-display-null -vm-sound-null Pharo-2.0.image eval 1+2
ubuntu at ip-10-48-234-254:~/pharo2$
Maybe it also depends on whether the invocation is from an interactive terminal or a shell script..
>> PS: the colored error output it cool !
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