command line util for grabbing current weather for a city using OpenWeather API

README.md

usage

Create an account at https://openweathermap.org and get an API key. Note that it can take up to a couple of hours for the key to become active. Add an environment variable OPEN_WEATHER_API_KEY with the value of the key.

run the script:

./weather.clj Toronto,CA

🌆 City:	Old Toronto
📍 State:	Ontario
🌍 Country:	CA

🌡 Temperature:	5 °C
💁‍♀️ Feel like:	0 °C
🧊 Minimum:	4 °C
🔥 Maximum:	5 °C
🌊 Pressure:	1015 hPa
😰 Humitdity:	61 %

☁️ Cloudiness:		0 %
🌬 Wind Speed:		8.75 m/s
🧭 Wind Direction:	210 °
🌁 Visibility:		10000

weather.clj

#!/usr/bin/env bb
(ns weather
  (:require 
   [cheshire.core :as cheshire]
   [clojure.string :as string]
   [org.httpkit.client :as http]))

(def app-id (System/getenv "OPEN_WEATHER_API_KEY"))
(def base-url "https://api.openweathermap.org")

(defn fetch-data
  [path params]
  (-> @(http/get (str base-url path) 
                 {:query-params (assoc params :appid app-id)})
      :body
      (cheshire/decode true)))

(defn fetch-city
  [city]
  (first (fetch-data "/geo/1.0/direct" {:q city :limit 1})))

(defn fetch-weather
  [city-info]
  (fetch-data "/data/2.5/weather" (select-keys city-info [:lat :lon])))

(defn kelvin->celsius
  [temp]
  (int (- temp 273.15)))

(defn format-temp
  [{:keys [temp feels_like temp_min temp_max pressure humidity]}]
  (str
   "\n🌡  Temperature:\t" (kelvin->celsius temp) " °C"
   "\n💁‍♀️ Feel like:\t" (kelvin->celsius feels_like) " °C"
   "\n🧊 Minimum:\t" (kelvin->celsius temp_min) " °C"
   "\n🔥 Maximum:\t" (kelvin->celsius temp_max) " °C"
   "\n🌊 Pressure:\t" pressure " hPa"
   "\n😰 Humitdity:\t" humidity " %"))

(defn format-city
  [{:keys [name country state]}]
  (str
   "\n🌆 City:\t" name
   "\n📍 State:\t" state
   "\n🌍 Country:\t" country))

(defn format-weather
  [{:keys [wind clouds visibility]}]
  (str
   "\n☁️  Cloudiness:\t\t" (:all clouds) " %"
   "\n🌬  Wind Speed:\t\t" (:speed wind) " m/s"
   "\n🧭 Wind Direction:\t" (:deg wind) " °"
   "\n🌁 Visibility:\t\t" visibility))

(defn print-weather
  [city]
  (let [city-info (fetch-city city) 
        {:keys [main] :as weather}
        (fetch-weather city-info)]
    (->> [(format-city city-info)
          (format-temp main)
          (format-weather weather)]
         (string/join "\n")
         (println))))

(when-not app-id
 (println "missing OPEN_WEATHER_API_KEY environment variable")
 (System/exit 1))

(print-weather (first *command-line-args*))