runtime-shell/commands/date.js

Some useful shell commands for runtime.js

'use strict';

// replaceAll() from http://stackoverflow.com/a/1144788/4713791
function replaceAll(find, replace, str) {
  return str.replace(new RegExp(find, 'g'), replace);
}

function removeChar(index, str) {
  return str.slice(0, index) + str.slice(index + 1);
}

module.exports = function(runtime) {
  runtime.shell.setCommand('date', function(args, env, cb) {
    var d = new Date();
    if (args == '') {
      env.stdio.writeLine(d);
      cb(0);
    } else {
      var i = args.indexOf('+');
      if (i === 0 || i === 1) {
        var ds = removeChar(i, args);
        ds = removeChar(0, ds);
        ds = removeChar(ds.length-1, ds);
        replaceAll('%%', '%', ds);
        // Uses only 'nu' locale. TODO: fix this.

        var days = [
          'Sunday',
          'Monday',
          'Tuesday',
          'Wednesday',
          'Thursday',
          'Friday',
          'Saturday'
        ];

        var shortdays = [
          'Sun',
          'Mon',
          'Tue',
          'Wed',
          'Thur',
          'Fri',
          'Sat'
        ];

        // Weekday
        ds = replaceAll('%a', shortdays[d.getDay()], ds);

        ds = replaceAll('%A', shortdays[d.getDay()], ds);


        // Month
        ds = replaceAll('%b', d.toLocaleDateString('nu', {
          month: 'short'
        }), ds);

        ds = replaceAll('%B', d.toLocaleDateString('nu', {
          month: 'long'
        }), ds);

        // Date & Time
        ds = replaceAll('%c', d.toLocaleDateString('nu', {
          weekday: 'short',
          month: 'long',
          day: 'numeric',
          hour: 'numeric',
          minute: 'numeric',
          second: 'numeric',
          year: 'numeric'
        }), ds);

        // Century
        ds = replaceAll('%C', parseInt(String(d.getFullYear()).substring(0, 2)) + 1, ds);

        // Day of month
        ds = replaceAll('%d', d.getDate(), ds);

        // Month/Day/Year
        ds = replaceAll('%D', d.getMonth() + '/' + d.getDate() + '/' + String(d.getFullYear()).substring(2), ds);

        // (space)Day
        ds = replaceAll('%e', ' ' + d.getDate(), ds);

        // Full year-Month-Day
        ds = replaceAll('%F', d.getFullYear() + '-' + d.getMonth() + '-' + d.getDate(), ds);

        // TODO: this, the ISO Week number (%g)
        ds = replaceAll('%g', '', ds);

        // Last two digits of year of ISO week number
        ds = replaceAll('%G', String(d.getFullYear()).substring(2), ds);

        // Same as %b
        ds = replaceAll('%h', d.toLocaleDateString('nu', {
          month: 'short'
        }), ds);

        // Hour
        ds = replaceAll('%H', String(d.getHours()), ds);

        // 12-Hour
        var dhours = d.getHours() > 12 ? d.getHours() - 12 : d.getHours();
        ds = replaceAll('%I', String(dhours), ds);

        // TODO: this, the day number relative to the year (001...366, 366 for a leap year)
        ds = replaceAll('%j', '', ds);

        // Hour
        ds = replaceAll('%k', String(d.getHours()), ds);

        // 12-Hour
        ds = replaceAll('%l', dhours < 10 ? '0' + String(dhours) : String(dhours), ds);

        // month
        ds = replaceAll('%m', d.getMonth(), ds);

        // minute
        ds = replaceAll('%M', d.getMinutes(), ds);

        ds = replaceAll('%n', '\n', ds);

        // TODO: this stuff
        ds = replaceAll('%N', '', ds);

        // AM or PM
        ds = replaceAll('%p', d.getHours() < 13 ? 'AM' : 'PM', ds);

        // TODO: this stuff
        ds = replaceAll('%P', '', ds);

        // 12:59:59 PM
        ds = replaceAll('%r', d.toLocaleTimeString('nu', { hour12: true }), ds);

        ds = replaceAll('%R', String(d.getHours()) + ':' + d.getMinutes(), ds);

        // TODO: this, the number of seconds since Jan 1, 1990
        ds = replaceAll('%s', '', ds);

        // Seconds (0-60)
        ds = replaceAll('%S', d.getSeconds(), ds);

        // Tab
        ds = replaceAll('%t', '\t', ds);

        // Same as %H:%M:%S
        ds = replaceAll('%T', d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds(), ds);

        // Number of the day of the week
        ds = replaceAll('%u', d.getDay() === 0 ? 7 : d.getDay(), ds);

        // TODO: this, the week number of the year
        ds = replaceAll('%U', '', ds);

        // TODO: this, the ISO week number of the year
        ds = replaceAll('%V', '', ds);

        // 0-indexed number of the day of the week
        ds = replaceAll('%w', d.getDay(), ds);

        // TODO: this, the monday-first week number of the year
        ds = replaceAll('%W', '', ds);

        ds = replaceAll('%x', d.toLocaleDateString('nu'), ds);

        var tt = d.toLocaleTimeString('nu');
        tt = tt.substring(0, tt.length-3);
        ds = replaceAll('%X', tt, ds);

        ds = replaceAll('%y', String(d.getFullYear()).substring(2), ds);

        ds = replaceAll('%Y', d.getFullYear(), ds);

        // TODO: this stuff, time zones
        ds = replaceAll('%z', '', ds);
        ds = replaceAll('%:z', '', ds);
        ds = replaceAll('%::z', '', ds);
        ds = replaceAll('%:::z', '', ds);
        ds = replaceAll('%Z', '', ds);

        env.stdio.writeLine(ds);

        cb(0);
      } else {
        env.stdio.writeError(new Error('Format string must begin with +'));
        return cb(1);
      }
    }
  });
}