# Code coverage report for lib/cli/parse.js

## Statements: 86.75% (72 / 83) Branches: 83.52% (76 / 91) Functions: 100% (4 / 4) Lines: 86.42% (70 / 81)

All files » lib/cli/ » parse.js

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     'use strict';
    /*

    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'),
        path = require('path'),
        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) {
      Iif (typeof argv === 'string') {
        argv = argv.split(' ');
      }

      var eat = function (i, args) {
        Eif (i <= args.length) {
          return args.splice(i + 1, 1).pop();
        }
      };

      var args = argv.slice(2),
          script = null,
          nodemonOptions = { scriptPosition: -1 };

      var nodemonOpt = nodemonOption.bind(null, nodemonOptions),
          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);
            // 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--;
          }
        }
      }

      if (script === null && !nodemonOptions.exec) {
        script = findAppScript();
      }

      // allows the user to specify a script and for nodemon to throw an exception
      // *instead* of echoing out the usage and ignoring the poor user altogether,
      // just because the filename (or argument) specified wasn't found.
      if (!script && args.length) {
        script = args.pop();
      }

      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 seperation on purpose to help legibility
      Iif (arg === '--help' || arg === '-h' || arg === '-?') {
        var help = eatNext();
        options.help = help ? help : true;
      }

      else if (arg === '--version' || arg === '-v') {
        options.version = true;
      }

      else Iif (arg === '--dump') {
        options.dump = true;
      }

      else if (arg === '--verbose' || arg === '-V') {
        options.verbose = true;
      }

      // Depricated as this is "on" by default
      else Iif (arg === '--js') {
        options.js = true;
      }

      else if (arg === '--quiet' || arg === '-q') {
        options.quiet = true;
      }

      else Iif (arg === '--hidden') { // TODO document this flag?
        options.hidden = true;
      }

      else if (arg === '--watch' || arg === '-w') {
        Eif (!options.watch) { options.watch = []; }
        options.watch.push(eatNext());
      }

      else if (arg === '--ignore' || arg === '-i') {
        Eif (!options.ignore) { options.ignore = []; }
        options.ignore.push(eatNext());
      }

      else if (arg === '--exitcrash') {
        options.exitcrash = true;
      }

      else if (arg === '--delay' || arg === '-d') {
        options.delay = parseInt(eatNext(), 10) * 1000;
      }

      else if (arg === '--exec' || arg === '-x') {
        options.exec = eatNext();
      }

      else if (arg === '--legacy-watch' || arg === '-L') {
        options.legacyWatch = true;
      }

      else if (arg === '--no-stdin' || arg === '-I') {
        options.stdin = false;
      }

      else if (arg === '--ext' || arg === '-e') {
        options.ext = eatNext();
      }

      else Iif (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 {
        return false; // this means we didn't match
      }
    }

    function findAppScript() {
      var appScript = null;

      // nodemon has been run alone, so try to read the package file
      // or try to read the index.js file

      // doing a try/catch because we can't use the path.exist callback pattern
      // or we could, but the code would get messy, so this will do exactly
      // what we're after - if the file doesn't exist, it'll throw.
      try {
        // note: this isn't nodemon's package, it's the user's cwd package
        appScript = JSON.parse(fs.readFileSync('./package.json').toString()).main;
        Eif (appScript !== undefined) {
          // no app found to run - so give them a tip and get the feck out
          return appScript;
        }
      } catch (e) {}

      // now try index.js
      if (existsSync('./index.js')) { // FIXME is ./ the right location?
        return 'index.js';
      }

      return null;
    }