Add watch commands to itctl

cmd/itctl/watch/heart.go

@@ -0,0 +1,75 @@
+/*
+ *	itd uses bluetooth low energy to communicate with InfiniTime devices
+ *	Copyright (C) 2021 Arsen Musayelyan
+ *
+ *	This program is free software: you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation, either version 3 of the License, or
+ *	(at your option) any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package watch
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.arsenm.dev/itd/api"
+)
+
+// heartCmd represents the address command
+var heartCmd = &cobra.Command{
+	Use:   "heart",
+	Short: "Watch InfiniTime's heart rate for changes",
+	Run: func(cmd *cobra.Command, args []string) {
+		client := viper.Get("client").(*api.Client)
+
+		heartRateCh, cancel, err := client.WatchHeartRate()
+		if err != nil {
+			log.Fatal().Err(err).Msg("Error getting heart rate channel")
+		}
+		defer cancel()
+
+		signalCh := make(chan os.Signal, 1)
+		go func() {
+			<-signalCh
+			cancel()
+			os.Exit(0)
+		}()
+		signal.Notify(signalCh,
+			syscall.SIGINT,
+			syscall.SIGTERM,			
+		)
+
+		for heartRate := range heartRateCh {
+			fmt.Println(heartRate, "BPM")
+		}
+	},
+}
+
+func init() {
+	watchCmd.AddCommand(heartCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// addressCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// addressCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}