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+     id="path1838" /></g>
+        </g>
+    </g>
+</svg>
diff --git a/macos/.hammerspoon/images/slack-color.png b/macos/.hammerspoon/images/slack-color.png
new file mode 100644
index 0000000..b6dc3aa
Binary files /dev/null and b/macos/.hammerspoon/images/slack-color.png differ
diff --git a/macos/.hammerspoon/images/slack-color.svg b/macos/.hammerspoon/images/slack-color.svg
new file mode 100644
index 0000000..d9accdf
--- /dev/null
+++ b/macos/.hammerspoon/images/slack-color.svg
@@ -0,0 +1 @@
+<svg enable-background="new 0 0 24 24" height="512" viewBox="0 0 24 24" width="512" xmlns="http://www.w3.org/2000/svg"><path d="m8.843 12.651c-1.392 0-2.521 1.129-2.521 2.521v6.306c0 1.392 1.129 2.521 2.521 2.521s2.521-1.129 2.521-2.521v-6.306c-.001-1.392-1.13-2.521-2.521-2.521z" fill="#e91e63"/><path d="m.019 15.172c0 1.393 1.13 2.523 2.523 2.523s2.523-1.13 2.523-2.523v-2.523h-2.521c-.001 0-.001 0-.002 0-1.393 0-2.523 1.13-2.523 2.523z" fill="#e91e63"/><path d="m8.846-.001c-.001 0-.002 0-.003 0-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523h2.521v-2.523c0-.001 0-.003 0-.005-.001-1.391-1.128-2.518-2.518-2.518z" fill="#00bcd4"/><path d="m2.525 11.37h6.318c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523h-6.318c-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523z" fill="#00bcd4"/><path d="m21.457 6.323c-1.391 0-2.518 1.127-2.518 2.518v.005 2.523h2.521c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523c-.001 0-.002 0-.003 0z" fill="#4caf50"/><path d="m12.641 2.522v6.325c0 1.392 1.129 2.521 2.521 2.521s2.521-1.129 2.521-2.521v-6.325c0-1.392-1.129-2.521-2.521-2.521-1.392 0-2.521 1.129-2.521 2.521z" fill="#4caf50"/><g fill="#ff9800"><path d="m17.682 21.476c0-1.392-1.129-2.521-2.521-2.521h-2.521v2.523c.001 1.391 1.129 2.519 2.521 2.519s2.521-1.129 2.521-2.521z"/><path d="m21.479 12.649h-6.318c-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523h6.318c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523z"/></g></svg>
\ No newline at end of file
diff --git a/macos/.hammerspoon/images/slack-white.png b/macos/.hammerspoon/images/slack-white.png
new file mode 100644
index 0000000..89252b3
Binary files /dev/null and b/macos/.hammerspoon/images/slack-white.png differ
diff --git a/macos/.hammerspoon/images/slack-white.svg b/macos/.hammerspoon/images/slack-white.svg
new file mode 100644
index 0000000..da1d12b
--- /dev/null
+++ b/macos/.hammerspoon/images/slack-white.svg
@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   enable-background="new 0 0 24 24"
+   height="512"
+   viewBox="0 0 24 24"
+   width="512"
+   version="1.1"
+   id="svg20"
+   sodipodi:docname="slack-white.svg"
+   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04, custom)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs24" />
+  <sodipodi:namedview
+     id="namedview22"
+     pagecolor="#505050"
+     bordercolor="#ffffff"
+     borderopacity="1"
+     inkscape:pageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="1"
+     showgrid="false"
+     inkscape:zoom="1.7050781"
+     inkscape:cx="256"
+     inkscape:cy="255.70676"
+     inkscape:window-width="3840"
+     inkscape:window-height="1531"
+     inkscape:window-x="0"
+     inkscape:window-y="32"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg20" />
+  <path
+     d="m8.843 12.651c-1.392 0-2.521 1.129-2.521 2.521v6.306c0 1.392 1.129 2.521 2.521 2.521s2.521-1.129 2.521-2.521v-6.306c-.001-1.392-1.13-2.521-2.521-2.521z"
+     fill="#e91e63"
+     id="path2"
+     style="fill:#ffffff" />
+  <path
+     d="m.019 15.172c0 1.393 1.13 2.523 2.523 2.523s2.523-1.13 2.523-2.523v-2.523h-2.521c-.001 0-.001 0-.002 0-1.393 0-2.523 1.13-2.523 2.523z"
+     fill="#e91e63"
+     id="path4"
+     style="fill:#ffffff" />
+  <path
+     d="m8.846-.001c-.001 0-.002 0-.003 0-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523h2.521v-2.523c0-.001 0-.003 0-.005-.001-1.391-1.128-2.518-2.518-2.518z"
+     fill="#00bcd4"
+     id="path6"
+     style="fill:#ffffff" />
+  <path
+     d="m2.525 11.37h6.318c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523h-6.318c-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523z"
+     fill="#00bcd4"
+     id="path8"
+     style="fill:#ffffff" />
+  <path
+     d="m21.457 6.323c-1.391 0-2.518 1.127-2.518 2.518v.005 2.523h2.521c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523c-.001 0-.002 0-.003 0z"
+     fill="#4caf50"
+     id="path10"
+     style="fill:#ffffff" />
+  <path
+     d="m12.641 2.522v6.325c0 1.392 1.129 2.521 2.521 2.521s2.521-1.129 2.521-2.521v-6.325c0-1.392-1.129-2.521-2.521-2.521-1.392 0-2.521 1.129-2.521 2.521z"
+     fill="#4caf50"
+     id="path12"
+     style="fill:#ffffff" />
+  <g
+     fill="#ff9800"
+     id="g18"
+     style="fill:#ffffff">
+    <path
+       d="m17.682 21.476c0-1.392-1.129-2.521-2.521-2.521h-2.521v2.523c.001 1.391 1.129 2.519 2.521 2.519s2.521-1.129 2.521-2.521z"
+       id="path14"
+       style="fill:#ffffff" />
+    <path
+       d="m21.479 12.649h-6.318c-1.393 0-2.523 1.13-2.523 2.523s1.13 2.523 2.523 2.523h6.318c1.393 0 2.523-1.13 2.523-2.523s-1.13-2.523-2.523-2.523z"
+       id="path16"
+       style="fill:#ffffff" />
+  </g>
+</svg>
diff --git a/macos/.hammerspoon/init.lua b/macos/.hammerspoon/init.lua
index 35387a0..6fce839 100644
--- a/macos/.hammerspoon/init.lua
+++ b/macos/.hammerspoon/init.lua
@@ -66,7 +66,12 @@ end)
 -- Homebrew Update Indicator
 --------------------------------------------------------------------------------
 
+local homebrewIconWhite = hs.image
+  .imageFromPath('~/.hammerspoon/images/homebrew-white.png')
+  :setSize(hs.geometry.size(16, 16))
+
 local homebrewMenubar = hs.menubar.new()
+homebrewMenubar:setIcon(homebrewIconWhite)
 
 homebrewMenubar:setClickCallback(function()
   hs.applescript.applescript([[
@@ -82,12 +87,53 @@ function updateHomebrewMenubar()
   local _, numOutdated = outdated:gsub('\n', '\n')
 
   if numOutdated > 0 then
-    homebrewMenubar:setTitle(string.format('🍺 %s', numOutdated))
+    homebrewMenubar:setTitle(string.format(' %s', numOutdated))
     homebrewMenubar:setTooltip(outdated)
   else
-    homebrewMenubar:delete()
+    homebrewMenubar:setTitle('')
+    homebrewMenubar:setTooltip('Up to date')
   end
 end
 
 updateHomebrewMenubar()
 hs.timer.doEvery(3600, updateHomebrewMenubar)
+
+--------------------------------------------------------------------------------
+-- Slack Message Indicator
+--------------------------------------------------------------------------------
+
+local slackIconWhite = hs.image
+  .imageFromPath('~/.hammerspoon/images/slack-white.png')
+  :setSize(hs.geometry.size(16, 16))
+
+local slackMenubar = hs.menubar.new()
+slackMenubar:setIcon(slackIconWhite)
+
+slackMenubar:setClickCallback(function()
+  hs.application.launchOrFocus('Slack')
+end)
+
+function updateSlackMenubar()
+  local dock = hs.axuielement.applicationElement('Dock')
+  local children = dock:attributeValue('AXChildren')
+
+  if children and children[1] and children[1]:attributeValue('AXRole') == 'AXList' then
+    local list = children[1]:attributeValue('AXChildren')
+    for _, v in pairs(list) do
+      if v:attributeValue('AXTitle') == 'Slack' then
+        local label = v:attributeValue('AXStatusLabel') or '0'
+
+        if label == '0' then
+          slackMenubar:setTitle('')
+          slackMenubar:setTooltip('No unread messages')
+        else
+          slackMenubar:setTitle(string.format(' %s', label))
+          slackMenubar:setTooltip(string.format('%s unread message(s)', label))
+        end
+      end
+    end
+  end
+end
+
+updateSlackMenubar()
+hs.timer.doEvery(60, updateSlackMenubar)