Setting iTerm2 tab name to shortened current directory in zsh

instructions.md

ensure that Profile -> Terminal -> Terminal may report title is checked

Then add the following to .zshrc

# set iterm title
iterm_title() {
  echo -ne "\e]1;$1\a"
}

# set iterm tab title on prompt
iterm_title_pwd() {
  # shorten path
  p="${PWD/#$HOME/~}"
  # replace parent directories with first letter but not the last one
  p=$(echo $p | sed -E 's|([^/])[^/]*\/|\1/|g')
  iterm_title "$p"
}
autoload -Uz add-zsh-hook
add-zsh-hook precmd iterm_title_pwd