diff --git a/autoload/do.vim b/autoload/do.vim
index ce55419..a2d1802 100644
--- a/autoload/do.vim
+++ b/autoload/do.vim
@@ -1,3 +1,23 @@
+" Setup changing cursor dependant on mode
+function! do#cursor_escape_sequences()
+  if has('unix')
+    if $ITERM_SESSION_ID !=# ''
+      let &t_SI = "\<Esc>]50;CursorShape=1\x7"
+      let &t_SR = "\<Esc>]50;CursorShape=2\x7"
+      let &t_EI = "\<Esc>]50;CursorShape=0\x7"
+    else
+      let &t_SI = "\<Esc>[6 q"
+      let &t_SR = "\<Esc>[4 q"
+      let &t_EI = "\<Esc>[2 q"
+    endif
+    if $TMUX !=# ''
+      let &t_SI = "\<Esc>Ptmux;\<Esc>".&t_SI."\<Esc>\\"
+      let &t_SR = "\<Esc>Ptmux;\<Esc>".&t_SR."\<Esc>\\"
+      let &t_EI = "\<Esc>Ptmux;\<Esc>".&t_EI."\<Esc>\\"
+    endif
+  endif
+endfunction
+
 " Save, call isort on, then reload a python file.
 function! do#isort()
   if &filetype !=# 'python'