Node Command Arguments Parsing

argparse.js

var validArgs = ['some_command', 'another_command'];

//=================================================================
//First lets sort out the command line arguments
//=================================================================
var userArgs;
//Is the first item 'node'? then we're testing
if (process.argv[0].toLowerCase() == 'node') {
  //whack the first two items off of the list of arguments
  //This removes the node entry as well as the module name entry (the
  //program we're running)
  userArgs = process.argv.slice(2);
} else {
  //whack the first item off of the list of arguments
  //This removes just the module name entry
  userArgs = process.argv.slice(1);
}

//now parse the command line options
var numArgs = userArgs.length;
if (numArgs > 0) {
  //Get the first parameter all lowercase
  var arg1 = userArgs[0];
  if (validArgs.indexOf(arg1) > -1) {
    //Then we have one of our valid commands
    doLog("We have a valid argument");
    switch (arg1) {
    case '-ls':
      //List the ics files we have in the home directory
      listICSFiles();
      break;
    case '-prepare':
      if (numArgs > 1) {
        //Take the specified file path and process the file
        prepareICSFile(userArgs[1]);
      } else {
        //Missing argument (need a file path)
        console.log("\nMissing command-line argument. Need file path when -prepare option is used\n".error);
        displayHelp();
      }
      break;
    }
  } else {
    doLog("Detected an invalid parameter, so we must have a file path");
    //Not in the array, so must be a file path
    //validate that we have a file and it exists

    //if so, process it!
    processICSFile(arg1);
  }
} else {
  //Missing command line oarguments
  console.log("\nMissing command-line arguments\n".error);
  displayHelp();
}