James, All well and good, but you still need to know if you're running in a REPL environment, and make sure you do NOT call System/exit for any (typical) reason in that environment. The idea is to test your (-main) function from the REPL, without having to restart the lisp every time.
On Thu, May 8, 2014 at 10:28 AM, James Reeves <ja...@booleanknot.com> wrote: > Sure, but those return codes correspond to some ending state of your > application, which can occur via a normal function return, or through an > exception. In both cases, your -main function can map state to exit code. > > For instance, let's assume that your application will return or except. In > example below I'm using Slingshot to handle the exceptions: > > (defn -main [& args] > (try+ > (apply app args) (System/exit 0) > (catch [:exit :app/bad-data] _ (System/exit 1)) > (catch [:exit :app/connect-failed] _ (System/exit 2)))) > > > Alternatively, if the app function returns the status rather than excepts: > > (defn -main [& args] > (System/exit > (case (apply app args) > :app/ok 0 > :app/bad-data 1 > :app/connect-failed 2))) > > > - James > > > > On 8 May 2014 14:23, Dave Tenny <dave.te...@gmail.com> wrote: > >> When running as an uberjar, i.e. "java -jar myapp.jar [args]" >> the return code of the process to the shell is very important. >> System/exit is how that return code is sent. >> >> >> On Thu, May 8, 2014 at 9:20 AM, James Reeves <ja...@booleanknot.com>wrote: >> >>> Having your application call System/exit directly is often indicative of >>> some unnecessary coupling in your code. >>> >>> Under what circumstances does your application need to exit? >>> >>> - James >>> >>> >>> On 22 April 2014 17:59, Dave Tenny <dave.te...@gmail.com> wrote: >>> >>>> I have an app I'm building. It calls System/exit. That doesn't works >>>> so well if I'm debugging in the REPL however. >>>> >>>> What's the preferred method of determining whether I'm in REPL mode >>>> interaction vs running as a standalone app? >>>> >>>> Also, long as I'm asking and being lazy, does the -main function return >>>> value translate to a System/exit value if it's numeric? >>>> Or is System/exit the way to go? >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To post to this group, send email to clojure@googlegroups.com >>>> Note that posts from new members are moderated - please be patient with >>>> your first post. >>>> To unsubscribe from this group, send email to >>>> clojure+unsubscr...@googlegroups.com >>>> For more options, visit this group at >>>> http://groups.google.com/group/clojure?hl=en >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to clojure+unsubscr...@googlegroups.com. >>>> >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clojure@googlegroups.com >>> Note that posts from new members are moderated - please be patient with >>> your first post. >>> To unsubscribe from this group, send email to >>> clojure+unsubscr...@googlegroups.com >>> For more options, visit this group at >>> http://groups.google.com/group/clojure?hl=en >>> --- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "Clojure" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/clojure/KZJQsmOeiHc/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> clojure+unsubscr...@googlegroups.com. >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "Clojure" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/clojure/KZJQsmOeiHc/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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