Allow overriding default iTerm session profile.

iTerm2 nightly has an improved scripting bridge that exposes sessions, but until that ships, we'll have to use a hardcoded default and let users override.

plugins/tab/tab.fish

@@ -7,6 +7,11 @@
 #     tab [PATH]            Open PATH in a new tab
 #     tab [CMD]             Open a new tab and execute CMD
 #     tab [PATH] [CMD] ...  You can prolly guess
+#
+# If you use iTerm and your default session profile isn't "Default Session",
+# override it in your config.fish
+#
+#     set -g tab_iterm_profile "MyProfile"
 
 function tab -d 'Open the current directory (or any other directory) in a new tab'
   set -l cmd ''
@@ -29,10 +34,14 @@ function tab -d 'Open the current directory (or any other directory) in a new ta
   switch $TERM_PROGRAM
 
   case 'iTerm.app'
+    set -l profile 'Default Session'
+    if set -q tab_iterm_profile
+      set profile $tab_iterm_profile
+    end
     osascript 2>/dev/null -e "
       tell application \"iTerm\"
         tell current terminal
-          launch session \"Default Session\"
+          launch session \"$profile\"
           tell the last session
             write text \"cd \\\"$cdto\\\"$cmd\"
           end tell