[provisioning] Use emacs-mac in OSX

recipes/brew

@@ -20,6 +20,15 @@ function _brew_cask {
     fi
 }
 
+function _brew_tap {
+    local tap=$1
+    if ! brew tap | grep "^$tap$" >/dev/null 2>&1; then
+        _run "[brew tap] Tap repository $tap" brew tap $@
+    else
+        echo "[brew tap] $tap is already present, skipping."
+    fi
+}
+
 case "$(uname -s)" in
     Darwin)
         if ! which brew >/dev/null; then

recipes/emacs

@@ -6,7 +6,8 @@ _recipe brew
 
 case $_PLATFORM in
     darwin)
-        _brew emacs --with-cocoa --with-librsvg --with-imagemagick@6
+        _brew_tap railwaycat/emacsmacport
+        _brew emacs-mac --with-modern-icon
         ;;
     linux)
         _recipe _apt