Bill wrote > J interpreter only knows the last script that it started to load.
That's the key to the whole thing. I'm convinced nothing can go wrong (with 4!:3/4!:4) when there are no scripts involved which load other scripts. But they do. All too often. On top of that, if you use the scheme a lot, as I did, then another script can be loaded later and overwrite the pronoun: MYSCRIPT. Maybe I need to be more paranoid and not go using the name 'MYSCRIPT' for every script that wants to badge the locale it creates, but instead… ++ randomise the name - and be able to recognise the one you want when there's more than one (which in itself would be highly diagnostic), ++ create the global if absent, and subsequently catenate entries to it, ++ look at the 4!:4 of every name in 4!:1[0 and take a majority vote (…but that's no good for a stock phrase to be executed at load-time at the top of the script.) On Wed, 10 Apr 2019 at 01:42, bill lam <bbill....@gmail.com> wrote: > I think J interpreter only knows the last script that it started to load. > It doesn't know from which scripts that the current sentence being executed > came because all are inside RAM. The identity of script file name are lost. > > On Wed, Apr 10, 2019, 8:27 AM Ian Clark <earthspo...@gmail.com> wrote: > > > @Don - that's the scheme I've been using. Basically: create a global noun > > and look at its 4!:4. For a couple of years I used it in all the code > that > > needed it. Then it let me down a year ago, and unfortunately I never > > tracked down why. But the upshot was so grave that I tore the facility > out > > of all my code and looked for alternative ways of registering the path > > about to be loaded, where this was under my control. > > > > It all became very hit-and-miss, and recently I've come to the conclusion > > that if anyone reading this list had a tested and guaranteed solution to > > this problem, or there was a magic Foreign I didn't know about, I needed > to > > know it. > > > > People like me who use whichscript a lot (it uses 4!:4 and resides in > > ~addons/misc/miscutils/utils.ijs) know that all too often it can return > > 'Not from script'. Generally when you really want to know: where did > *that* > > blessed (noun/verb) come from??! Well, the question I want to answer in > > this thread is: what script does such-and-such a locale imagine has > created > > it? (Or last pooped-on it.) > > > > Why do I want to know? > > (1) for forensic reasons (i.e. bug-hunting in conditions of > > code-regression). I keep a lot of versions of suites of scripts I'm > > developing, and I can't be sure I've always purged *all* the old > versions. > > Particularly from unfinished jobs gathering dust. > > (2) to enable a script to execute: "load the version of script XYZ which > is > > meant to reside in the folder I find myself in". (Surely addon-writers > and > > heavy GutHub cloners have this requirement? > > > > I shall carry on looking for more and more reliable techniques… but > surely > > the J interpreter, in its heart-of-hearts, knows the path to the file it > is > > currently loading, so why is this such a big deal? > > > > Ian > > > > On Wed, 10 Apr 2019 at 00:38, Ian Clark <earthspo...@gmail.com> wrote: > > > > > @Eric - tried that too. > > > > > > The "load" verb contains the line: Loaded_j_=: ~. Loaded_j_,fl > > > > > > so although I know the path I need is in Loaded_j_ somewhere, I can't > > tell > > > which one it is. > > > > > > I've also tried modifying load, assigning the local: (fl) to a > > > guaranteed-unique _z_ or _j_ pronoun before it gets lost. That doesn't > > > always work either, except with non-nested loads. I admit I don't know > > why > > > (it looks as if it can't fail!) and I've been too busy to go looking. > > > > > > Unless someone knows a *guaranteed* way, I'm going to book it at > > > https://code.jsoftware.com/wiki/System/Interpreter/Requests > > > > > > > > > On Tue, 9 Apr 2019 at 14:22, Eric Iverson <eric.b.iver...@gmail.com> > > > wrote: > > > > > >> Ian, > > >> I don't think 4!:3 meets your needs (duplicates). The load verb > > maintains > > >> Loaded_j_ and this might meet your needs. > > >> > > >> On Tue, Apr 9, 2019 at 8:49 AM bill lam <bbill....@gmail.com> wrote: > > >> > > >> > Does this work? > > >> > > > >> > MYSCRIPT=: >{:4!:3'' > > >> > > > >> > On Tue, Apr 9, 2019, 8:29 PM Ian Clark <earthspo...@gmail.com> > wrote: > > >> > > > >> > > How can I *reliably* fetch the path of the script being loaded, > > >> whilst it > > >> > > is being loaded? > > >> > > > > >> > > Everything I've tried either fails or fingers the wrong script on > > >> > > occasions. Especially if my script is the subject of "load" or > > >> "require" > > >> > by > > >> > > another script. > > >> > > > > >> > > I want to be able to write at the top of my script, say > > >> > > > > >> > > cocurrent 'myloc' > > >> > > MYSCRIPT=: theScriptCurrentlyBeingLoaded'' > > >> > > > > ---------------------------------------------------------------------- > > >> > > 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 > > > > > > > > ---------------------------------------------------------------------- > > 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
