.profile

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"
}

dark_gray=$(tput setaf 236)
light_gray=$(tput setaf 242)
red=$(tput setaf 124)
blue=$(tput setaf 68)
green=$(tput setaf 28)
normal=$(tput sgr0)

git_prompt() {
  local branch
  local suffix
  branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
  if [ $? -ne 0 ]; then
    unset __git_status __git_branch __git_color __git_suffix
    return
  fi

  git diff-index --quiet --cached HEAD 2>/dev/null
  local staged=$?

  git diff-files --quiet 2>/dev/null
  local changed=$?

  test -z "$(git ls-files --exclude-standard --others 2>/dev/null)"
  local untracked=$?

  local color=${light_gray}
  if [ $staged -eq 1 ]; then
    color=${green}
    if [ $changed -eq 1 ]; then
      suffix="+"
    fi
  elif [ $changed -eq 1 ]; then
    color=${red}
  fi

  if [ $untracked -eq 1 ]; then
    suffix="${suffix}…"
  fi

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

status() {
  __status=$?
  [ "$__status" -eq 0 ] && __status_color=${blue} || __status_color=${red}
  export __status_color
}

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

PROMPT_COMMAND='status; full_line; git_prompt; short_pwd;'
PS1='\[\e]0;$USER@$(hostname -s): $__short_pwd\a\]\[${dark_gray}\]${__line}\n\[${normal}\]${__short_pwd} \[${__git_color}\]${__git_branch}\[${light_gray}\]${__git_suffix}\[${__status_color}\]❯\[${normal}\] '