prompt.sh

_color_dark_gray=$(tput setaf 238)
_color_light_gray=$(tput setaf 244)
_color_red=$(printf "\e[31m")
_color_blue=$(printf "\e[34m")
_color_green=$(printf "\e[32m")
_color_normal=$(printf "\e[0m")

_short_pwd() {
  if [ "$PWD" == "/" ]; then
    export __short_pwd="/"
    return
  fi

  # this is where we'll accumulate our result
  local path
  # and where we'll accumulate a denormalized result
  local fullpath

  # find out if we're in the user's home directory and set prefixes if so
  local trimmedpath=${PWD#$HOME}
  if [ "$trimmedpath" != "$PWD" ]; then
    path="~"
    fullpath="$HOME"
  fi

  # split the trimmed path into an array and save the length - 1 for convenience
  local parts=(${trimmedpath//\// })
  local length=$(( ${#parts[@]} - 1 ))

  # iterate over the path array
  for i in "${!parts[@]}"; do
    # reset the depth to 1, save the part to make things easier
    local depth=1
    local part=${parts[$i]}

    # if this is the last item, just append it as is and return
    if [ $i -eq $length ]; then
      path="${path}/${part}"
      continue
    fi

    # otherwise we evaluate to see if we should abbreviate and to what depth
    # start by getting a list of files matching at the current depth
    local files=("${fullpath}/${part::$depth}"*)

    # loop until we get a depth that returns only one result, or until the whole string still has conflicts
    while [ ${#files[@]} -gt 1 -a $depth -lt ${#part} ]; do
      depth=$(( depth + 1 ))
      files=("${fullpath}/${part::$depth}"*)
    done

    # append the abbreviated string to the path, and the full string to the full path
    path="${path}/${part::$depth}"
    fullpath="${fullpath}/${part}"
  done

  export __short_pwd="$path"
}

_git_prompt() {
  local status
  status=$(git status -unormal 2>&1)
  if [ $? -ne 0 ]; then
    unset __git_status __git_branch __git_color __git_suffix
    return
  fi

  [[ "$status" =~ On\ branch\ ([^[:space:]]+) ]]; local branch=${BASH_REMATCH[1]}
  [[ "$status" =~ Changes\ to\ be\ committed ]]; local staged=$?
  [[ "$status" =~ Changes\ not\ staged\ for\ commit ]]; local changed=$?
  [[ "$status" =~ Untracked\ files ]]; local untracked=$?

  local suffix
  local color=${_color_light_gray}
  if [ $staged -eq 0 ]; then
    color=${_color_green}
    if [ $changed -eq 0 ]; then
      suffix="+"
    fi
  elif [ $changed -eq 0 ]; then
    color=${_color_red}
  fi

  if [ $untracked -eq 0 ]; then
    suffix="${suffix}…"
  fi

  export __git_color=$color
  export __git_branch=$branch
  export __git_suffix="${suffix} "
}

_status() {
  [ "$?" -eq 0 ] && __status_color=${_color_blue} || __status_color=${_color_red}
  export __status_color
}

_full_line() {
  export __line=$(eval printf %.0s─ '{1..'"$(tput cols)}"\})
}

[[ -s /etc/profile.d/vte.sh ]] && . /etc/profile.d/vte.sh
function _build_prompt() {
  _status
  history -a
  _git_prompt
  _short_pwd
  # vte_pwd=$(__vte_osc7)
  PS1='\[\e]0;$(basename $SHELL) $__short_pwd\a\]\n${__short_pwd} \[${__git_color}\]${__git_branch}\[${_color_light_gray}\]${__git_suffix}\[${__status_color}\]❯\[${_color_normal}\] '
}

PROMPT_COMMAND=_build_prompt