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Add a polling fallback to filesystem watcher #254

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Add a polling fallback to filesystem watcher #254

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14 changes: 12 additions & 2 deletions src/figwheel/main/watching.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -8,13 +8,23 @@

(def ^:dynamic *hawk-options* nil)

(defn watch-with-fallback!
"Wraps hawk/watch! to swap in a polling implementation if any of the native
OS file events interfaces fail."
[opts & groups]
(try
(apply hawk/watch! opts groups)
(catch Exception e
(prn e "WARN - no native fs events; falling back to polling filesystem")
(apply hawk/watch! (assoc opts :watcher :polling) groups))))

(defn alter-watches [{:keys [watcher watches]} f]
(when watcher (hawk/stop! watcher))
(let [watches (f watches)
watcher (when (not-empty watches)
(if *hawk-options*
(apply hawk/watch! *hawk-options* (map vector (vals watches)))
(apply hawk/watch! (map vector (vals watches)))))]
(apply watch-with-fallback! *hawk-options* (map vector (vals watches)))
(apply watch-with-fallback! (map vector (vals watches)))))]
{:watcher watcher
:watches watches}))

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