thunder.js

/* NEW BSD LICENSE {{{
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# http://sourceforge.jp/projects/opensource/wiki/licenses%2Fnew_BSD_license #
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}}} */

// PLUGIN_INFO {{{
let PLUGIN_INFO =
<VimperatorPlugin>
  <name>thunder</name>
  <description>tell you how far away lightning is from you.</description>
  <version>0.0.1</version>
  <author homepage="https://github.com/Jagua">Jagua</author>
  <license>new BSD License (Please read the source code comments of this plugin)</license>
  <license lang="ja">修正BSDライセンス (ソースコードのコメントを参照してください)</license>
  <updateURL>https://github.com/Jagua/vimperator-plugins-sample/blob/master/thunder.js</updateURL>
  <minVersion>2.3</minVersion>
  <maxVersion>3.4</maxVersion>
  <detail><![CDATA[
    == Commands ==
    :thunder <oa>time</oa>
      display how far away lightning is from you.
      <oa>time</oa> : time until hearing the thunder from shining the lightning.

    == Setting Sample ==
    .vimperatorrc setting sample

    if you want to use weatherapi, write the following setting.

    let g:thunder_city = 'Tokyo'
    let g:thunder_use_weatherapi = 0
      0: not use api
      1: use api

  ]]></detail>
</VimperatorPlugin>;
// }}}

(function () {

  function getweather(city, callback) {
    util.httpGet("http://www.google.com/ig/api?weather=" + city, function (xhr) {
      let xml = xhr.responseXML;
      let temp_c = xml.getElementsByTagName("temp_c")[0].getAttribute("data");
      callback(parseFloat(temp_c));
    });
  }

  function thunder(args) {
    var useapi = liberator.globalVariables.thunder_use_weatherapi || false;
    var city = liberator.globalVariables.thunder_city || 'Tokyo';
    var temp_c = liberator.globalVariables.thunder_temp || 20;
    var time = parseFloat(args[0]);
    var c = 340;
    var distance = 0;

    function calc_and_display(temp_c) {
      /**
        c = sqrt(kRT/M)

        k = 1.403
        R = 8.314472
        T = 273.15 + t
        M = 28.966E-3 kg/mol
       **/

      c = Math.sqrt(1.403 * 8.314472 * (273.15 + temp_c) / 0.028966);
      distance = c * time;
      distance = Math.round(distance * 100) / 100;

      var app = "";
      if (useapi) {
        app = " <span style='margin-left:1em'>/ USEAPI(city: &quot;" + city + "&quot;, temp_c: &quot;" + temp_c + "&quot;)</span>";
      }

      liberator.echo("<span style='font-size:120%;margin:1em'><strong>"
                     + distance +
                       "</strong></span> <span>meters away</span>" + app,
                     commandline.FORCE_MULTILINE);
    }

    if (useapi) {
      getweather(city, calc_and_display);
    } else {
      calc_and_display(parseFloat(temp_c));
    }
  }

  commands.addUserCommand(
    ['thu[nder]'],
    'display the distance to the lightning',
    function (args) {
      thunder(args);
    },{
      bang: false,
      argCount: '1',
    },
    true
  );

})();

// vim: set et fdm=syntax fenc= ft=javascript sts=2 sw=2 ts=2 :