94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
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// GoWeather
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//
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// Copyright (c) 2023 Helmut Kaczmarek <code@helmutkaczmarek.de>
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//
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// My first small attempt in the programming language Go.
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//
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// GoWeather is a tiny command line program that queries the current
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// weather in a specified city via OpenWeatherMap's API and displays the
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// result in the terminal window.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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)
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// Structure to store the weather data from the API
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type WeatherData struct {
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Name string `json:"name"`
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Main struct {
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Temp float64 `json:"temp"`
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} `json:"main"`
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Weather []struct {
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Description string `json:"description"`
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} `json:"weather"`
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Cod int `json:"cod"`
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Message string `json:"message"`
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}
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func main() {
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// Put your OpenWeatherMap API key and city ID here
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apiKey := "API_KEY"
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city := "CITY_ID"
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// Generate the URL for the API call
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url := fmt.Sprintf("http://api.openweathermap.org/data/2.5/weather?id=%s&appid=%s&units=metric", city, apiKey)
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// Send the API call and get the response
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response, err := http.Get(url)
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if err != nil {
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fmt.Println("Error getting the data:", err)
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return
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}
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defer response.Body.Close()
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// Decode the JSON response into the WeatherData structure
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var data WeatherData
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if err := json.NewDecoder(response.Body).Decode(&data); err != nil {
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fmt.Println("Error decoding data:", err)
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return
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}
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// Check for API error codes and display error messages if there are any
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if data.Cod == 401 {
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fmt.Println("Error: Invalid API key.")
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fmt.Println("API error message:", data.Message)
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return
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}
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if data.Cod != 200 {
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fmt.Println("Error: Request failed.")
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fmt.Println("API error message:", data.Message)
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return
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}
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// Display the weather data in the terminal window
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fmt.Printf("Weather in %s\n", data.Name)
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fmt.Println("===============================")
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fmt.Printf("Temperature: %.1f °C\n", data.Main.Temp)
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if len(data.Weather) > 0 {
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fmt.Printf("Description: %s\n", data.Weather[0].Description)
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}
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fmt.Println("===============================")
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// Wait for the enter key before exiting the program
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fmt.Print("Press Enter to exit GoWeather...")
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fmt.Scanln()
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}
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