add iterm2 shell integration

.iterm2/it2attention

@@ -0,0 +1,71 @@
+#!/bin/bash
+
+# tmux requires unrecognized OSC sequences to be wrapped with DCS tmux;
+# <sequence> ST, and for all ESCs in <sequence> to be replaced with ESC ESC. It
+# only accepts ESC backslash for ST.
+function print_osc() {
+    if [[ $TERM == screen* ]] ; then
+        printf "\033Ptmux;\033\033]"
+    else
+        printf "\033]"
+    fi
+}
+
+# More of the tmux workaround described above.
+function print_st() {
+    if [[ $TERM == screen* ]] ; then
+        printf "\a\033\\"
+    else
+        printf "\a"
+    fi
+}
+
+function show_help() {
+  echo "Usage:" 1>& 2
+  echo "  $(basename $0) start" 1>& 2
+  echo "    Begin bouncing the dock icon if another app is active" 1>& 2
+  echo "  $(basename $0) stop" 1>& 2
+  echo "    Stop bouncing the dock icon if another app is active" 1>& 2
+  echo "  $(basename $0) fireworks" 1>& 2
+  echo "    Show an explosion animation at the cursor" 1>& 2
+}
+
+function start_bounce() {
+  print_osc
+  printf "1337;RequestAttention=1"
+  print_st
+}
+
+function stop_bounce() {
+  print_osc
+  printf "1337;RequestAttention=0"
+  print_st
+}
+
+function fireworks() {
+  print_osc
+  printf "1337;RequestAttention=fireworks"
+  print_st
+}
+
+## Main
+if [[ $# == 0 ]]
+then
+  show_help
+  exit 1
+fi
+
+if [[ $1 == start ]]
+then
+  start_bounce
+elif [[ $1 == stop ]]
+then
+  stop_bounce
+elif [[ $1 == fireworks ]]
+then
+  fireworks
+else
+  show_help
+  exit 1
+fi
+