crypto

cmd/crypto.go

@@ -0,0 +1,79 @@
+/*
+Copyright © 2023 NAME HERE <EMAIL ADDRESS>
+*/
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/spf13/cobra"
+)
+
+type Tokens []struct {
+	ID     string `json:"id"`
+	Symbol string `json:"symbol"`
+	Name   string `json:"name"`
+}
+
+type Price map[string]USD
+
+type USD struct {
+	Usd float64
+}
+
+var (
+	price_url  = "https://api.coingecko.com/api/v3/simple/price?"
+	vs_url     = "https://api.coingecko.com/api/v3/simple/supported_vs_currencies"
+	tokens_url = "https://api.coingecko.com/api/v3/coins/list"
+)
+
+var amount float64
+
+// cryptoCmd represents the crypto command
+var cryptoCmd = &cobra.Command{
+	Use:   "crypto",
+	Short: "get price of token",
+	Long:  `get price of token`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		price, err := usdPrice(args[0])
+		if err != nil {
+			return err
+		}
+		price = price * amount
+		price2 := float64(1)
+		if len(args) >= 2 {
+			price2, err = usdPrice(args[1])
+			if err != nil {
+				return err
+			}
+		}
+		fmt.Println(price / price2)
+		return nil
+	},
+}
+
+func usdPrice(token string) (float64, error) {
+	resp, err := http.Get(price_url + fmt.Sprintf("ids=%s&vs_currencies=usd", token))
+	if err != nil {
+		return 0, err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return 0, err
+	}
+	var price Price
+	err = json.Unmarshal(body, &price)
+	if err != nil {
+		return 0, err
+	}
+	return price[token].Usd, nil
+}
+
+func init() {
+	rootCmd.AddCommand(cryptoCmd)
+	cryptoCmd.PersistentFlags().Float64VarP(&amount, "amount", "a", 1, "amount of the given token")
+}