Here's a solution to the problem I was trying to solve. I'm not happy with
it (the definition of has-repl?), but it's working for now.
It's also Sun/Oracle JVM specific with the sun.java.command clause.
Again, the problem is that I wanted an exit routine I could call that
wouldn't terminate the jvm when I'm running -main from the REPL, but that
otherwise calls System/exit when running as an uberjar.
Other suggestions welcome.
(defn has-repl?
"Return true if we appear to be running with a REPL, false otherwise."
[]
;; *TBD*: Consider looking for some particular repl routine in jvm stack
traces
;; Don't care about the clojure.* prop vals, just that the property
exists.
(if (or (System/getProperty "clojure.debug")
(System/getProperty "clojure.compile.path")
(if-let [command (System/getProperty "sun.java.command")]
(.contains command "clojure.main")))
true
false))
(defn- exit [status & [msg]]
(when msg
(println msg))
(flush)
(if (has-repl?)
(throw (ex-info msg {:repl-exit true :status status}))
(System/exit status)))
;; And in (-main)
...
(catch Exception e
(if-let [m (ex-data e)]
;; exception is of type clojure.lang.ExceptionInfo
(if (:repl-exit m)
(:status m)
(exit 2 (str "Unexpected ex-data:" m "on" e)))
;; Caught an exception that wasn't thrown via pseudo-exit
(if (has-repl?)
(println (str e)) ;print to REPL
(exit 2 (str e)))))))) ;print and exit java
On Tue, Apr 22, 2014 at 12:59 PM, Dave Tenny <[email protected]> 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 [email protected]
> Note that posts from new members are moderated - please be patient with
> your first post.
> To unsubscribe from this group, send email to
> [email protected]
> 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
> [email protected].
> 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 [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
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 [email protected].
For more options, visit https://groups.google.com/d/optout.
