Hacky way to detect terminal focus for given process name (OSX)

app-focus-osx.js

/*
If terminal doesn't have focus, it won't execute the child process.
If it does have focus, the process will execute and then check
to see if the windows title matches your regular expression.
Only then will timeMet be set and the timeout will run
*/

var timeMet = false;
setTimeout(function(){
  if(!timeMet){
    // do your thing here
  }
}, 500);
var res = require('child_process').exec('osascript osx-active-app.scpt');
res.stdout.on('data', function (d) {
  // change this regular expression to match the executable
  var rex = new RegExp('myapp -flags');

  if(rex.test(d)){
    timeMet = true;
  }
});

osx-active-app.scpt

tell application "System Events"
    set frontApp to name of first application process whose frontmost is true
end tell
tell application frontApp
    if the (count of windows) is not 0 then
        set window_name to name of front window
    end if
end tell

This has been turned into an NPM package: https://www.npmjs.com/package/detect-active-title