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+/*
+
+nodemon is a utility for node, and replaces the use of the executable
+node. So the user calls `nodemon foo.js` instead.
+
+nodemon can be run in a number of ways:
+
+`nodemon` - tries to use package.json#main property to run
+`nodemon` - if no package, looks for index.js
+`nodemon app.js` - runs app.js
+`nodemon --arg app.js --apparg` - eats arg1, and runs app.js with apparg
+`nodemon --apparg` - as above, but passes apparg to package.json#main (or
+  index.js)
+`nodemon --debug app.js
+
+*/
+
+var fs = require('fs');
+var path = require('path');
+var existsSync = fs.existsSync || path.existsSync;
+
+module.exports = parse;
+
+/**
+ * Parses the command line arguments `process.argv` and returns the
+ * nodemon options, the user script and the executable script.
+ *
+ * @param  {Array} full process arguments, including `node` leading arg
+ * @return {Object} { options, script, args }
+ */
+function parse(argv) {
+  if (typeof argv === 'string') {
+    argv = argv.split(' ');
+  }
+
+  var eat = function (i, args) {
+    if (i <= args.length) {
+      return args.splice(i + 1, 1).pop();
+    }
+  };
+
+  var args = argv.slice(2);
+  var script = null;
+  var nodemonOptions = { scriptPosition: null };
+
+  var nodemonOpt = nodemonOption.bind(null, nodemonOptions);
+  var lookForArgs = true;
+
+  // move forward through the arguments
+  for (var i = 0; i < args.length; i++) {
+    // if the argument looks like a file, then stop eating
+    if (!script) {
+      if (args[i] === '.' || existsSync(args[i])) {
+        script = args.splice(i, 1).pop();
+
+        // we capture the position of the script because we'll reinsert it in
+        // the right place in run.js:command (though I'm not sure we should even
+        // take it out of the array in the first place, but this solves passing
+        // arguments to the exec process for now).
+        nodemonOptions.scriptPosition = i;
+        i--;
+        continue;
+      }
+    }
+
+    if (lookForArgs) {
+      // respect the standard way of saying: hereafter belongs to my script
+      if (args[i] === '--') {
+        args.splice(i, 1);
+        nodemonOptions.scriptPosition = i;
+        // cycle back one argument, as we just ate this one up
+        i--;
+
+        // ignore all further nodemon arguments
+        lookForArgs = false;
+
+        // move to the next iteration
+        continue;
+      }
+
+      if (nodemonOpt(args[i], eat.bind(null, i, args)) !== false) {
+        args.splice(i, 1);
+        // cycle back one argument, as we just ate this one up
+        i--;
+      }
+    }
+  }
+
+  nodemonOptions.script = script;
+  nodemonOptions.args = args;
+
+  return nodemonOptions;
+}
+
+
+/**
+ * Given an argument (ie. from process.argv), sets nodemon
+ * options and can eat up the argument value
+ *
+ * @param {Object} options object that will be updated
+ * @param {Sting} current argument from argv
+ * @param {Function} the callback to eat up the next argument in argv
+ * @return {Boolean} false if argument was not a nodemon arg
+ */
+function nodemonOption(options, arg, eatNext) {
+  // line separation on purpose to help legibility
+  if (arg === '--help' || arg === '-h' || arg === '-?') {
+    var help = eatNext();
+    options.help = help ? help : true;
+  } else
+
+  if (arg === '--version' || arg === '-v') {
+    options.version = true;
+  } else
+
+  if (arg === '--no-update-notifier') {
+    options.noUpdateNotifier = true;
+  } else
+
+  if (arg === '--spawn') {
+    options.spawn = true;
+  } else
+
+  if (arg === '--dump') {
+    options.dump = true;
+  } else
+
+  if (arg === '--verbose' || arg === '-V') {
+    options.verbose = true;
+  } else
+
+  if (arg === '--legacy-watch' || arg === '-L') {
+    options.legacyWatch = true;
+  } else
+
+  if (arg === '--polling-interval' || arg === '-P') {
+    options.pollingInterval = parseInt(eatNext(), 10);
+  } else
+
+  // Depricated as this is "on" by default
+  if (arg === '--js') {
+    options.js = true;
+  } else
+
+  if (arg === '--quiet' || arg === '-q') {
+    options.quiet = true;
+  } else
+
+  if (arg === '--config') {
+    options.configFile = eatNext();
+  } else
+
+  if (arg === '--watch' || arg === '-w') {
+    if (!options.watch) { options.watch = []; }
+    options.watch.push(eatNext());
+  } else
+
+  if (arg === '--ignore' || arg === '-i') {
+    if (!options.ignore) { options.ignore = []; }
+    options.ignore.push(eatNext());
+  } else
+
+  if (arg === '--exitcrash') {
+    options.exitcrash = true;
+  } else
+
+  if (arg === '--delay' || arg === '-d') {
+    options.delay = parseDelay(eatNext());
+  } else
+
+  if (arg === '--exec' || arg === '-x') {
+    options.exec = eatNext();
+  } else
+
+  if (arg === '--no-stdin' || arg === '-I') {
+    options.stdin = false;
+  } else
+
+  if (arg === '--on-change-only' || arg === '-C') {
+    options.runOnChangeOnly = true;
+  } else
+
+  if (arg === '--ext' || arg === '-e') {
+    options.ext = eatNext();
+  } else
+
+  if (arg === '--no-colours' || arg === '--no-colors') {
+    options.colours = false;
+  } else
+
+  if (arg === '--signal' || arg === '-s') {
+    options.signal = eatNext();
+  } else
+
+  if (arg === '--cwd') {
+    options.cwd = eatNext();
+
+    // go ahead and change directory. This is primarily for nodemon tools like
+    // grunt-nodemon - we're doing this early because it will affect where the
+    // user script is searched for.
+    process.chdir(path.resolve(options.cwd));
+  } else {
+
+    // this means we didn't match
+    return false;
+  }
+}
+
+/**
+ * Given an argument (ie. from nodemonOption()), will parse and return the
+ * equivalent millisecond value or 0 if the argument cannot be parsed
+ *
+ * @param {String} argument value given to the --delay option
+ * @return {Number} millisecond equivalent of the argument
+ */
+function parseDelay(value) {
+  var millisPerSecond = 1000;
+  var millis = 0;
+
+  if (value.match(/^\d*ms$/)) {
+    // Explicitly parse for milliseconds when using ms time specifier
+    millis = parseInt(value, 10);
+  } else {
+    // Otherwise, parse for seconds, with or without time specifier then convert
+    millis = parseFloat(value) * millisPerSecond;
+  }
+
+  return isNaN(millis) ? 0 : millis;
+}
+