[split] Move tab plugin to oh-my-fish/plugin-tab

https://github.com/oh-my-fish/plugin-tab

plugins/tab/tab.fish

-# Open new iTerm and Terminal tabs from the command line
-#
-# Author: Justin Hileman (http://justinhileman.com)
-#
-# Usage:
-#     tab                   Opens the current directory in a new tab
-#     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 ''
-  set -l cdto $PWD
-
-  if test (count $argv) -gt 0
-    if test -d $argv[1]
-      pushd . >/dev/null
-      cd $argv[1]
-      set cdto $PWD
-      set -e argv[1]
-      popd >/dev/null
-    end
-  end
-
-  if test (count $argv) -gt 0
-    set cmd "; $argv"
-  end
-
-  switch $TERM_PROGRAM
-
-  case 'iTerm.app'
-    set -l profile 'Default Session'
-    if set -q tab_iterm_profile
-      set profile $tab_iterm_profile
-    end
-    osascript 2>/dev/null -e "
-      tell application \"iTerm\"
-        tell current terminal
-          launch session \"$profile\"
-          tell the last session
-            write text \"cd \\\"$cdto\\\"$cmd\"
-          end tell
-        end tell
-      end tell
-    "
-
-  case 'Apple_Terminal'
-    osascript 2>/dev/null -e "
-      tell application \"Terminal\"
-        activate
-        tell application \"System Events\" to keystroke \"t\" using command down
-        repeat while contents of selected tab of window 1 starts with linefeed
-          delay 0.01
-        end repeat
-        do script \"cd \\\"$cdto\\\"$cmd\" in window 1
-      end tell
-    "
-
-  case '*'
-    echo "Unknown terminal: $TERM_PROGRAM" >&2
-  end
-end