names your iTerm2 tab after the current working directory, shows the path in the prompt and the git branch

gistfile1.txt

# thanks to this gist for the iTerm2 tab naming stuff: https://gist.github.com/phette23/5270658
# can't remember where I cribbed the rest of this from!
# hacked it a bit to work on OS X

_bold=$(tput bold)
_normal=$(tput sgr0)

__vcs_dir() {
	local vcs base_dir sub_dir ref
	sub_dir() {
	  local sub_dir
	  sub_dir=$(stat -f "${PWD}")
	  sub_dir=${sub_dir#$1}
	  echo ${sub_dir#/}
	}

	git_dir() {
	 #base_dir=$(git-rev-parse --show-cdup 2>/dev/null) || return 1
   
	 if [ -n "$base_dir" ]; then 
	  base_dir=`cd $base_dir; pwd`
	 else 
    base_dir=$PWD 
   fi
	 #base_dir="$(basename "${base_dir}")"
	 vcs="git"
   ref=`git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'`
	 #ref=$(git-symbolic-ref -q HEAD || git-name-rev --name-only HEAD 2>/dev/null)
	 #ref=${ref#refs/heads/}

   #sub_dir=$(git-rev-parse --show-prefix)
	 sub_dir="/${sub_dir%/}"
	}
  
	svn_dir() {
	 [ -d ".svn" ] || return 1
	 base_dir="."
	 while [ -d "$base_dir/../.svn" ]; do base_dir="$base_dir/.."; done
	 base_dir=`cd $base_dir; pwd`
	 sub_dir="/$(sub_dir "${base_dir}")"
	 ref=$(svn info "$base_dir" | awk '/^URL/ { sub(".*/","",$0); r=$0 } /^Revision/ { sub("[^0-9]*","",$0); print r":"$0 }')
   ref="[$ref]"
	 vcs="svn"
	 base_dir="$(basename "${base_dir}")"
	}

	git_dir || svn_dir
	
	if [ -n "$vcs" ]; then
    # I don't use svn much so happy to hide the vcs kind
 	  #__vcs_prefix="($vcs)"
	 __vcs_prefix=""
	 __vcs_base_dir="${base_dir/$HOME/~}"
	 __vcs_ref="$ref"
	 __vcs_sub_dir="${sub_dir}"
	else
	 __vcs_prefix=''
	 __vcs_base_dir="${PWD/$HOME/~}"
	 __vcs_ref=''
	 __vcs_sub_dir=''
	fi
  echo -ne "\033];${PWD##*/}\007"
}

export PROMPT_COMMAND=__vcs_dir
export PS1='\u$__vcs_ref:\[${_bold}\]${__vcs_base_dir}\[${_normal}\]${__vcs_refix}\[${_bold}\]${__vcs_sub_dir}\[${_normal}\]\$ '