Hrm. That's very handy, but in this case it's the opposite of what I want. The idea is that by default, `load 'whatever'` would just run the definitions and whatever setup code is absolutely necessary, but that there's some *extra* thing that runs if you run the file directly from the command line.
You shouldn't have to "opt out" of running the extra bit, because loading and using the definitions is usually the more common case, and you don't want to burden the user. On Wed, Sep 8, 2021 at 12:20 PM Raul Miller <[email protected]> wrote: > The approach mentioned at > https://rosettacode.org/wiki/Executable_library#J might interest you. > > Note that if you are importing it as a widget, you might also want to > override the command line implementation, for example using 9!:29]0 > > Anyways, it depends on what you are trying to do. > > -- > Raul > > On Wed, Sep 8, 2021 at 11:09 AM Michal Wallace <[email protected]> > wrote: > > > > In python, you can use this `if __name__=="__main__":` line in a module, > > and it will only execute the code in that block if you are running the > > module directly. > > > > This allows you to treat the same file as both a standalone application, > > and a library/module that can be imported into another program. (Or just > as > > often often, to run a test suite for just that module as the "standalone" > > version.) > > > > I tried to make the same thing in J > > > > My first thought was to turn on the debugger and inspect the stack to see > > whether or not we're inside of "load", but it turns out that load does > not > > appear in the stack trace unless you enabled the debugger *before* you > > called load. > > > > So instead, I wound up with this: > > > > {{y > > NB. standalone code goes here > > }}^:('repl.ijs' {.@E.&.|. >{.}.ARGV)'' > > > > It works pretty well, assuming the file in question is named 'repl.ijs' > ... > > > > Now I can run my repl as a standalone application, or import it as a > widget. > > (Yes, I could just make another file for the standalone code, but I > really > > like the python style.) > > > > Does anyone have a better approach? > > > > If load_j_ incremented and decremented a global counter, then you could > do > > this with: > > > > {{y > > NB. standalone code goes here > > }}^:(-.*load_depth)'' > > > > Thoughts? > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
