ww

#!/bin/bash
# Usage: ww -f "window class filter" -c "run if not found"
# Usage: ww -fa "window title filter" -c "run if not found"

## Find and contribute to a more updated version https://github.com/academo/ww-run-raise

POSITIONAL=()
while [[ $# -gt 0 ]]; do
  key="$1"

  case $key in
  -c | --command)
    COMMAND="$2"
    shift # past argument
    shift # past value
    ;;
  -f | --filter)
    FILTERBY="$2"
    shift # past argument
    shift # past value
    ;;
  -fa | --filter-alternative)
    FILTERALT="$2"
    shift # past argument
    shift # past value
    ;;
  *)                   # unknown option
    POSITIONAL+=("$1") # save it in an array for later
    shift              # past argument
    ;;
  esac
done

set -- "${POSITIONAL[@]}" # restore positional parameters

SCRIPT_CLASS_NAME=$(
  cat <<EOF
function kwinactivateclient(targetApp) {
  var clients = workspace.clientList();
  for (var i=0; i<clients.length; i++) {
    client = clients[i];
    if (client.resourceClass == targetApp){
      workspace.activeClient = client;
      break;
    }
  }
}
kwinactivateclient('REPLACE_ME');
EOF
)

SCRIPT_CAPTION=$(
  cat <<EOF
function kwinactivateclient(targetApp) {
  var clients = workspace.clientList();
  for (var i=0; i<clients.length; i++) {
    client = clients[i];
    if (client.caption == targetApp){
      workspace.activeClient = client;
      break;
    }
  }
}
kwinactivateclient('REPLACE_ME');
EOF
)

CURRENT_SCRIPT_NAME=$(basename $0)

# ensure the script file exists
function ensure_script {
  if [ ! -f SCRIPT_PATH ]; then
    if [ ! -d "$SCRIPT_FOLDER" ]; then
      mkdir -p "$SCRIPT_FOLDER"
    fi
    if [ "$1" == "class" ]; then
      SCRIPT_CONTENT=${SCRIPT_CLASS_NAME/REPLACE_ME/$2}
    else
      SCRIPT_CONTENT=${SCRIPT_CAPTION/REPLACE_ME/$2}
    fi
    echo "$SCRIPT_CONTENT" >"$SCRIPT_PATH"
  fi
}

if [ -z "$FILTERBY" ] && [ -z "$FILTERALT" ]; then
  echo You need to specify a window filter. Either by class -f or by title -fa
  exit 1
fi

IS_RUNNING=$(pgrep -o -a -f "$COMMAND" | grep -v "$CURRENT_SCRIPT_NAME")

if [ -n "$IS_RUNNING" ] || [ -n "$FILTERALT" ]; then
  SCRIPT_FOLDER="$HOME/.wwscripts/"
  SCRIPT_NAME=$(echo "$FILTERBY$FILTERALT" | md5sum | head -c 32)
  SCRIPT_PATH="$SCRIPT_FOLDER$SCRIPT_NAME"
  if [ -n "$FILTERBY" ]; then
    ensure_script class $FILTERBY
  else
    ensure_script caption $FILTERALT
  fi
  #SCRIPT_NAME="ww$RANDOM"
  SCRIPT_NAME=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
  # install the script
  ID=$(dbus-send --session --dest=org.kde.KWin --print-reply=literal /Scripting org.kde.kwin.Scripting.loadScript "string:$SCRIPT_PATH" "string:$SCRIPT_NAME" | awk '{print $2}')
  # run it
  dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Scripting.run
  dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Script.run
  # stop it
  dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Scripting.stop
  dbus-send --session --dest=org.kde.KWin --print-reply=literal "/$ID" org.kde.kwin.Script.stop
  # uninstall it
  dbus-send --session --dest=org.kde.KWin --print-reply=literal /Scripting org.kde.kwin.Scripting.unloadScript "string:$SCRIPT_NAME"
elif [ -n "$COMMAND" ]; then
  $COMMAND &
fi

What is the difference in org.kde.kwin.Script.stop and org.kde.kwin.Scripting.unloadScript? Is the latter needed? Please see this.

@Ashark if you only stop it but don't uninstall it it starts growing the list of scripts in kwinscript. I could not find a way to re-use an existing "installed" script so this is the solution I found to not pollute the kwinscripts list.

@academo For uninstalling, how do i know the script name, if i did not created it?
Can you try with the plasma-interactiveconsole? Open a dbus viewer. Then run any kwin script in interactiveconsole. Now update the dbus viewer. You will see a new id is resided there (this is a bug, i want to fix this). Now, if you click the stop method for that id, it will disappear.
But you say it remains residing there is not using uninstall method. And the current code of interactiveconsole does not invoke uninstall method.
Can you confirm?

@Ashark

how do i know the script name, if i did not created it?
I don't know :) I never went that far with KWin scripts and the documentation is quite vague. I mostly found things by experimentation and bits from forums here and there.

Then run any kwin script in interactiveconsole. Now update the dbus viewer. You will see a new id is resided there (this is a bug, i want to fix this). Now, if you click the stop method for that id, it will disappear.

Yes I can reproduce this.

But you say it remains residing there is not using uninstall method. And the current code of interactiveconsole does not invoke uninstall method.

I can see the ww script showing up briefly and disappearing from qdbusviewer session bus. I commented the uninstall line and this still happened so the uninstall method is not what removes it from the dbus list.

I commented stop and the id didn't remain there either so the stop is not the one removing it from the dbus list either.

My memory fails me since I did this some time ago and I am not working with Kwin scripts anymore but I remember there was a place where I could see the list of scripts installed via the dbus and if stop and unload were not called, the list kept growing and growing. Perhaps this list disappeared from newer kde versions?

Maybe they changed it in KDE, I too do not know.