add wolframalpha command

cmd/bot/commands.go

@@ -67,6 +67,13 @@ func (app *application) ParseCommand(evt *event.Event) {
 			return
 		}
 
+	case "wa":
+		if msgLen < 2 {
+			reply = "Not enough arguments provided. Usage: !wa [query]"
+		} else {
+			reply = commands.WolframAlphaQuery(evt.Content.AsMessage().Body[4:len(evt.Content.AsMessage().Body)])
+		}
+
 	}
 	if reply != "" {
 		app.SendText(evt, reply)

pkg/commands/wolframalpha.go

@@ -0,0 +1,36 @@
+package commands
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+func WolframAlphaQuery(query string) string {
+	err := godotenv.Load()
+	if err != nil {
+		return ""
+	}
+	appid := os.Getenv("WOLFRAMALPHA_APP_ID")
+	escaped := url.QueryEscape(query)
+	url := fmt.Sprintf("http://api.wolframalpha.com/v1/result?appid=%s&i=%s", appid, escaped)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		return ""
+	}
+
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return ""
+	}
+
+	reply := string(body)
+	return reply
+}