From bfe4648ed0ba0d5d2a9870833dec2517905a8901 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Fri, 30 Nov 2018 16:13:49 -0800
Subject: fix hammerspoon active app tracking

---
 hammerspoon/init.lua | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/hammerspoon/init.lua b/hammerspoon/init.lua
index 2f6b836..072957f 100644
--- a/hammerspoon/init.lua
+++ b/hammerspoon/init.lua
@@ -112,23 +112,41 @@ end)
 --     hs.eventtap.keyStroke({"cmd", "option"}, "i")
 -- end)
 
+possibly_active_apps = {}
+current_app_name = nil
+
 function enter_bindings(name)
     if extra_bindings[name] then
         extra_bindings[name]:enter()
+        current_app_name = name
     end
 end
 
 function exit_bindings(name)
     if extra_bindings[name] then
         extra_bindings[name]:exit()
+        current_app_name = nil
     end
 end
 
+-- the application watcher receives notifications about new apps being
+-- activated before the old apps are deactivated, so we have to hack around
+-- that a bit
 current_application_watcher = hs.application.watcher.new(function(name, event_type, app)
     if event_type == hs.application.watcher.activated then
-        enter_bindings(app:name())
+        possibly_active_apps[app:pid()] = app
     elseif event_type == hs.application.watcher.deactivated then
-        exit_bindings(app:name())
+        possibly_active_apps[app:pid()] = nil
+    end
+
+    apps = {}
+    for _, v in pairs(possibly_active_apps) do
+        table.insert(apps, v)
+    end
+
+    if #apps == 1 and apps[1]:name() ~= current_app_name then
+        exit_bindings(current_app_name)
+        enter_bindings(apps[1]:name())
     end
 end)
 enter_bindings(hs.application.frontmostApplication():name())
-- 
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