add iterm2 shell integration

.iterm2/it2universion

@@ -0,0 +1,104 @@
+#!/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) set 8" 1>& 2
+  echo "  $(basename $0) set 9" 1>& 2
+  echo "  $(basename $0) push [name]" 1>& 2
+  echo "     Saves the current version with an optional name." 1>& 2
+  echo "  $(basename $0) pop [name]" 1>& 2
+  echo "     If name is given, all versions up to and including the one with the matching name are popped." 1>& 2
+}
+
+function set_version() {
+  print_osc
+  printf "1337;UnicodeVersion=$1"
+  print_st
+}
+
+function push_version() {
+  print_osc
+  printf "1337;UnicodeVersion=push $1"
+  print_st
+}
+
+function pop_version() {
+  print_osc
+  printf "1337;UnicodeVersion=pop $1"
+  print_st
+}
+
+## Main
+if [[ $# == 0 ]]
+then
+  show_help
+  exit 1
+fi
+
+if [[ $1 == set ]]
+then
+  if [[ $# != 2 ]]
+  then
+    show_help
+    exit 1
+  fi
+  set_version $2
+elif [[ $1 == push ]]
+then
+  if [[ $# == 1 ]]
+  then
+    push_version ""
+  elif [[ $# == 2 ]]
+  then
+    if [[ $2 == "" ]]
+    then
+      echo "Name must not be empty" 1>& 2
+      exit 1
+    fi
+    push_version "$2"
+  else
+    show_help
+    exit 1
+  fi
+elif [[ $1 == pop ]]
+then
+  if [[ $# == 1 ]]
+  then
+    pop_version ""
+  elif [[ $# == 2 ]]
+  then
+    if [[ $2 == "" ]]
+    then
+      echo "Name must not be empty" 1>& 2
+      exit 1
+    fi
+    pop_version "$2"
+  else
+    show_help
+    exit 1
+  fi
+else
+  show_help
+  exit 1
+fi
+