index.js

#! /usr/bin/env node

const https = require("https");
const http = require("http");
const geoipURI = `https://telize.j3ss.co/geoip`;
const APIKEY = process.env.WUNDER_KEY || "6d0b4cdd7d6d8a5e";

function urlBuilder(type, location) {
  return `http://api.wunderground.com/api/${APIKEY}/${type}/q/${location.lat},${
    location.lng
  }.json`;
}

const weatherFetch = () => {
  https.get(geoipURI, res => {
    const { statusCode } = res;
    let error;
    if (statusCode !== 200) {
      error = new Error("Request Failed");
    }

    if (error) {
      console.log(error.message);
      res.resume();
      return;
    }

    res.setEncoding("utf8");

    let rawData = "";

    res.on("data", chunk => {
      rawData += chunk;
    });
    res.on("end", () => {
      try {
        const parsedData = JSON.parse(rawData);
        let location = {
          lat: parsedData.latitude,
          lng: parsedData.longitude
        };
        const weatherURL = urlBuilder(
          "conditions/forecast/astronomy",
          location
        );
        http.get(weatherURL, res => {
          const { statusCode } = res;
          let error;
          const contentType = res.headers["content-type"];
          if (statusCode !== 200) {
            error = new Error("Request failed to complete");
          } else if (!/^application\/json/.test(contentType)) {
            error = new Error(
              "Invalid content-type.\n" +
                `Expected application/json but received ${contentType}`
            );
          }

          if (error) {
            console.log(error.message);
            res.resume();
            return;
          }

          res.setEncoding("utf8");
          let rawWeatherData = "";

          res.on("data", chunk => {
            rawWeatherData += chunk;
          });
          res.on("end", () => {
            try {
              const weatherData = JSON.parse(rawWeatherData);
              renderWeather(weatherData.current_observation);
            } catch (e) {
              console.log(e.message);
            }
          });
        });
      } catch (e) {
        console.log(e.message);
      }
    });
  });
};

const renderWeather = data => {
  // console.log(data);
  let locationAndTime = `Showing current weather in ${
    data.display_location.full
  } at ${data.observation_time_rfc822}.`;
  let temperature = `- The temperature is ${data.temp_c}°C and feels like ${
    data.feelslike_c
  }°C`;
  let humidity = `- The humidity is ${data.relative_humidity}`;
  let windSpeed = `- The wind is ${
    data.wind_string
  } and blowing at a speed of ${data.wind_kph} km/hrs from ${data.wind_dir}`;
  let visibility = `- The visibility is ${data.visibility_km} kms`;
  const pressure = `- Current pressure is ${data.pressure_mb} mbar`;
  const precipiation = `- There is a ${
    data.precip_today_metric
  }% chance of rain today`;
  let developerAdvice = `We are using a free version of the weather API. It is recommended that you go ahead and register your own API key else we will hit rate-limits. https://www.wunderground.com/weather/api.\n`;
  let apiUsage = `Once you have the API key, run: export WUNDER_KEY='api_key_from_wundergrond'`;
  console.log("\n");
  console.log(locationAndTime);
  console.log("\n");
  console.log(temperature);
  console.log(humidity);
  console.log(windSpeed);
  console.log(visibility);
  console.log(pressure);
  console.log(precipiation);
  console.log("\n");
  console.log(`Powered by: ${data.image.title}`);
  console.log(`Link: ${data.image.link}`);
  console.log("\n");
  if (!process.env.WUNDER_KEY) {
    console.log(developerAdvice);
    console.log(apiUsage);
  }
};

// Handle standard --help, -h command line arguments and also warn user to register their own API
const [, , ...args] = process.argv;
args.forEach(argument => {
  if (argument === "--help" || argument === "-h") {
    let developerAdvice = `We are using a free version of the weather API. It is recommended that you go ahead and register your own API key else we will hit rate-limits. https://www.wunderground.com/weather/api.\n`;
    let apiUsage = `Once you have the API key, run: export WUNDER_KEY='api_key_from_wundergrond'`;
    console.log("Usage: Rum `mausam` on your terminal\n");
    console.log(developerAdvice);
    console.log(apiUsage);
  }
});

if (args.length === 0) {
  weatherFetch();
}