From 93649031c575e54b59407873f29d6fa12aa93d53 Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Fri, 25 May 2018 00:31:01 -0400
Subject: Add support for forever operation

---
 config.go |  1 +
 main.go   | 35 +++++++++++++++++++++++++++++------
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/config.go b/config.go
index 1402c17..3fae3ba 100644
--- a/config.go
+++ b/config.go
@@ -20,6 +20,7 @@ type BridgeConfig struct {
 type PhluxConfig struct {
 	Latitude  float64        `yaml:"latitude"`
 	Longitude float64        `yaml:"longitude"`
+	Interval  int64          `yaml:"interval"`
 	Bridges   []BridgeConfig `yaml:"bridges"`
 }
 
diff --git a/main.go b/main.go
index 00850db..e279d0f 100644
--- a/main.go
+++ b/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"flag"
 	"fmt"
 	"log"
 	"time"
@@ -14,8 +15,26 @@ const USERNAME = "phlux"
 func main() {
 	var config PhluxConfig
 	config.Read()
+
+	flag.Float64Var(&config.Latitude, "latitude", config.Latitude, "Latitude (used to calculate sunrise and sunset)")
+	flag.Float64Var(&config.Longitude, "longitude", config.Longitude, "Longitude (used to calculate sunrise and sunset)")
+	flag.Int64Var(&config.Interval, "interval", config.Interval, "Interval (in seconds) at which to run the update if --forever is set")
+	forever := flag.Bool("forever", false, "Run the update every [interval], use Ctrl-C to cancel")
+	flag.Parse()
+
 	log.Println("Config:", config)
 
+	updateColorTemps(&config)
+	if *forever {
+		ticker := time.NewTicker(time.Duration(config.Interval) * time.Second)
+		for {
+			<-ticker.C
+			updateColorTemps(&config)
+		}
+	}
+}
+
+func updateColorTemps(config *PhluxConfig) {
 	bridges, err := hue.FindBridges()
 	if err != nil {
 		log.Fatalf("Error finding bridges: %s\n", err.Error())
@@ -24,7 +43,7 @@ func main() {
 	desiredColorTemp := getDesiredColorTemperature(time.Now(), config.Latitude, config.Longitude)
 	for _, bridge := range bridges {
 		log.Printf("Bridge: %s\n", bridge.IPAddress)
-		updateBridge(&bridge, desiredColorTemp, &config)
+		updateBridge(&bridge, desiredColorTemp, config)
 	}
 }
 
@@ -71,22 +90,26 @@ func authenticate(bridge *hue.Bridge, config *PhluxConfig) error {
 	}
 	err = bridge.Login(token)
 	if err != nil {
-		log.Fatalf("Could not log in to bridge: %s\n", err.Error())
+		return errors.New(fmt.Sprintf("Could not log in to bridge: %s", err.Error()))
 	}
-	log.Println("Logged in to bridge")
 	return nil
 }
 
-func updateBridge(bridge *hue.Bridge, ct ColorTemperature, config *PhluxConfig) {
-	authenticate(bridge, config)
+func updateBridge(bridge *hue.Bridge, ct ColorTemperature, config *PhluxConfig) error {
+	err := authenticate(bridge, config)
+	if err != nil {
+		return err
+	}
+	log.Println("Logged in to bridge")
 	lights, err := bridge.GetAllLights()
 	if err != nil {
-		log.Fatalf("Error getting lights: %s\n", err.Error())
+		return errors.New(fmt.Sprintf("Error getting lights: %s", err.Error()))
 	}
 	log.Printf("Found %d lights\n", len(lights))
 	for _, light := range lights {
 		updateLight(light, ct)
 	}
+	return nil
 }
 
 func updateLight(light hue.Light, ct ColorTemperature) {
-- 
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