# Where does unreal live
unreal_path=$HOME/src/UnrealEngine/Engine/Binaries/Linux
 
# Make a temporary file to store our commands in
tmp_file=$(mktemp)
 
# Open project window
echo "$unreal_path/UE4Editor >/dev/null 2>@1" >> $tmp_file
 
# Figure out the PID of the new editor instance that the project window spawned 
# (there are probably better ways of doing this, like pgrep)
 
# Tokenize the string
echo "editor_process=\$(ps -ejH | tail -n1)" >> $tmp_file
# We only want the first token from the string so we just grab the first item here
echo "editor_pid=( \$editor_process )" >> $tmp_file
 
# Wait until the editor closes
echo "while kill -0 \$editor_pid >/dev/null 2>@1; do sleep 1; done" >> $tmp_file
 
# Clean up and exit
echo "rm -f $tmp_file" >> $tmp_file
echo "exit" >> $tmp_file
 
# Launch a new optirun powered bash instance and ask it to execute the commands
# in the file
optirun bash --rcfile $tmp_file

function goUnreal
  set -l unreal_path $HOME/src/UnrealEngine/Engine/Binaries/Linux
  set -l tmp_file (mktemp)
 
  set -q UNREAL_LOG_FILE; and rm -f $UNREAL_LOG_FILE;
  set -U UNREAL_LOG_FILE (mktemp)
 
  echo "source ~/.bashrc" > $tmp_file
  echo "PS1=\"[Unreal Shell] ~> \"" > $tmp_file
 
  if count $argv[1] > /dev/null
    # Test if project file exists
    set -l project_file $argv[1]
    if test -e $project_file
      # Test if full path exists
      set project_file (pwd)/$project_file
      if test ! -e $project_file
        echo "Project file $project_file doesn't exist"
        return 1
      end
    end
 
    # Open specific uproject
    echo "$unreal_path/UE4Editor >$UNREAL_LOG_FILE \"$project_file\" 2>@1" >> $tmp_file
  else
    # Open project window
    echo "$unreal_path/UE4Editor >$UNREAL_LOG_FILE 2>@1" >> $tmp_file
 
    # Figure out the PID of the new editor instance that the project window spawned
 
    # Tokenize the string
    echo "editor_process=\$(ps -ejH | tail -n1)" >> $tmp_file
    # We only want the first token from the string so we just grab the first item here
    echo "editor_pid=( \$editor_process )" >> $tmp_file
 
    # Wait until the editor closes
    echo "while kill -0 \$editor_pid >/dev/null 2>@1; do sleep 1; done" >> $tmp_file
  end
 
  # Clean up and exit
  echo "rm -f $tmp_file" >> $tmp_file
  echo "exit" >> $tmp_file
 
  optirun bash --rcfile $tmp_file
end