add iterm2 shell integration

.iterm2/it2ul

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+trap clean_up EXIT
+_STTY=$(stty -g)      ## Save current terminal setup
+stty -echo            ## Turn off echo
+
+function clean_up() {
+  stty "$_STTY"            ## Restore terminal settings
+}
+
+function show_help() {
+  echo "Usage: $(basename $0) [destination [tar flags]]" 1>& 2
+  echo "  If given, the destination specifies the directory to place downloaded files."
+  echo "  Further options are passed through to tar. See your system's manpage for tar for details."
+}
+
+function bad_input() {
+  echo "Bad input: %1" 1>& 2
+  exit 1
+}
+
+function die() {
+  echo "Fatal error: $1" 1>& 2
+  exit 1
+}
+
+function read_base64_stanza() {
+  value=""
+  while read line;
+  do 
+    if [ "$line" == "" ]; then
+      break
+    fi
+    printf "%s" "$line"
+  done
+}
+
+function decode() {
+  VERSION=$(base64 --version 2>&1)
+  if [[ "$VERSION" =~ fourmilab ]]; then
+    BASE64ARG=-d
+  elif [[ "$VERSION" =~ GNU ]]; then
+    BASE64ARG=-di
+  else
+    BASE64ARG=-D
+  fi
+
+  base64 "$BASE64ARG" <<< "$1"
+}
+
+# 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 [[ $TERM == screen* ]] ; then
+        printf "\a\033\\"
+    else
+        printf "\a"
+    fi
+}
+
+function send_request_for_upload() {
+  print_osc
+  printf '1337;RequestUpload=format=tgz' ""
+  print_st
+}
+
+location="$PWD"
+if [[ $# > 0 ]]
+then
+  location="$1"
+  shift
+fi
+
+send_request_for_upload
+read status
+
+if [[ $status == ok ]]
+then
+  data=$(read_base64_stanza)
+  clean_up
+  decode "$data" | tar -x -z -C "$location" -f - $* 1>& 2
+elif [[ $status == abort ]]
+then
+  echo "Upload aborted" 1>& 2
+else
+  die "Unknown status: $status" 1>& 2
+fi
+