Notification when long-running process has completed (only for OS X and Fish 2.2b1-10 or newer).

notifications.fish

#################
# notifications #
#################

function __record_cmd_begin -d "Record time when command started." -e fish_preexec
  set -g cmd_begin_time (eval date +"%s")
end

function __record_cmd_end -d "Record time when command ended." -e fish_postexec
  set -g cmd_end_time (eval date +"%s")
  set -g cmd_duration (math "($cmd_end_time-$cmd_begin_time)")
end

set notification_warn_after 10 # sec

function __notify_on_long_running_cmd -d "Show popup notification when long-running command has finished." -e fish_postexec
  set -l active_window_name (osascript -e \
    "tell application \"System Events\"
      set frontApp to name of first application process whose frontmost is true
    end tell"
  )

  if test "$active_window_name" != "Terminal"
    set -l command (echo $argv | cut -d ' ' -f 1)
    if test "$cmd_duration" -gt $notification_warn_after
      osascript -e "display notification \"$argv\" with title \"Command finished after $cmd_duration seconds!\""
    end
  end
end