Since stdlib is not updated for older versions of J, addons that depend on the J version will have to use their own test like your original jversion function.
Alternatively, set the addon manifest RELEASE for 9.4 or later and just support the new version number. The 9!:14 result is then parsed in revinfo_j_''. Earlier addon releases should still work on the corresponding J versions. On Sun, Dec 24, 2023 at 4:36 AM Ian Clark <earthspo...@gmail.com> wrote: > > I've a better idea. > > Establish a new system flag called (say) VERSION_z_ and assign it within > stdlib.ijs (c/f IFJHS or JLIB) the integer form of the J version (currently > this would be VERSION_z_ = 951). > > Then ~addons/math/cal/cal.ijs, or some other utility with a version > dependency, could test for J version being higher than 9.0.0 (say) like > this: > if. VERSION>900 do. > ... > > If VERSION_z_ is undefined, then instead of the current opaque error > message: > > > load 'math/cal' > > |ill-formed number: script > > | 9.5.1 > > | ^ > > | 900< ".}.'/'taketo 9!:14'' > > |[-32] /applications/j9.5/addons/math/cal/cal.ijs > > > the addon will fail with: > > load 'math/cal' > > |value error: VERSION > > | VERSION>900 > > |[-32] /applications/j9.5/addons/math/cal/cal.ijs > > > The fix will be obvious to someone with only weak J skills. > > Thus the user might insert this line into ~config/startup.ijs: > > VERSION_z_ =: 951 > > > > On Fri, 22 Dec 2023 at 04:48, Raul Miller <rauldmil...@gmail.com> wrote: > > > Hmm... only if we're updating stdlib, supporting versions of J back to > > 4.0.1. A worthwhile effort, though, if someone was actually tackling > > those issues. > > > > Otherwise, I think an idiom would be about as good as it gets. > > > > -- > > Raul > > > > > > On Thu, Dec 21, 2023 at 9:24 PM Ian Clark <earthspo...@gmail.com> wrote: > > > > > > For those of us digital archaeologists running back-levels of J, it would > > > be nice to have a robust test for a given version of J or later which > > > tolerates versions down to 4.01, say. > > > > > > > > > What represents best-practice? The best I can come up with is: > > > > > > jversion=: 3 : 0 > > > > > > ". 'j.' -.~ '/' taketo 9!:14'' > > > > > > ) > > > > > > > > > > > > which reliably returns a 3-digit integer, permitting (say): > > > > > > if. 900 <: jversion'' do. … > > > > > > > > > A candidate for stdlib? > > > ---------------------------------------------------------------------- > > > 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
