Don't block waiting to initialize geoclue

src/modules/api/location.cr

@@ -1,10 +1,27 @@
 module Wince::Location
   extend self
 
-  @@client = Geoclue::Simple.new_sync("space.quietfeathers.Wince", Geoclue::AccuracyLevel::Street, nil)
+  @@channel = Channel(Geoclue::Simple).new(1)
+  @@client : Geoclue::Simple? = nil
+  @@fiber : Fiber = spawn setup_client
 
-  def find_location()
-    location = @@client.location
-    [location.latitude, location.longitude]
+  def setup_client
+    @@channel.send Geoclue::Simple.new_sync("space.quietfeathers.Wince", Geoclue::AccuracyLevel::Street, nil)
+    Fiber.yield
+  end
+
+  # returns latlon if available, otherwise empty array
+  def find_location
+    if !@@fiber.dead?
+      return [] of Float64
+    end
+
+    if @@client.nil?
+      @@client = @@channel.receive
+    end
+
+    location = @@client.try do |c|
+      [c.location.latitude, c.location.longitude]
+    end || [] of Float64
   end
 end