Passing a $.filename path variable via bridgetalk

one way of doing what you need with minimal changes to your code is by

- wrapping your psScript in a function

- adding the function call to your bt.body. In other words, right now message refers to the psScript (which is just the function now), so we need to add the function call including the path parameter.

function main() {
    var scriptPath = (new File($.fileName)).path 

    //Bridgetalk stuff
    var scriptToLoad = new File (scriptPath + "/psScript.jsx") // laddar den rätta skriptfilen
    try {
        if (!scriptToLoad.exists) { throw new Error("script not found!"); }
        scriptToLoad.open ("r"); // read only
        var message = scriptToLoad.read();
        scriptToLoad.close()
    } catch (error) {
        alert("Error parsing the file: " + error.description);
    }
    //#target photoshop-13
    var bt = new BridgeTalk();
    bt.target = "photoshop";
    bt.body = message + "\nreadPath('" + scriptPath + "')";
    bt.send();
     
    //And on the other end in psScript.jsx I'm just trying to get it to alert me the path in a dialog box:
    //function readPath(scriptPath) {
    //    alert('Script path is: ' + scriptPath);
    //}
}

main();