add status page URL to email notifications

Include a configurable link to the HTML status page in email
notifications. Defaults to https://gogios.buetow.org but can be
customized via the StatusPageURL config option.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

3 files changed, 15 insertions, 2 deletions

diff --git a/internal/config.go b/internal/config.go
index 25a9ddd..5d172d6 100644
--- a/internal/config.go
+++ b/internal/config.go
@@ -16,6 +16,7 @@ type config struct {
 	StateDir           string `json:"StateDir,omitempty"`
 	HTMLStatusFile     string `json:"HTMLStatusFile,omitempty"` // Path to HTML status file
 	HTMLDisable        bool   `json:"HTMLDisable,omitempty"`    // Disable HTML status page generation
+	StatusPageURL      string `json:"StatusPageURL,omitempty"`  // URL to the HTML status page for email notifications
 	CheckTimeoutS      int
 	CheckConcurrency   int
 	StaleThreshold     int      `json:"StaleThreshold,omitempty"`
@@ -71,6 +72,12 @@ func newConfig(configFile string) (config, error) {
 		log.Println("Set HTMLStatusFile to " + conf.HTMLStatusFile)
 	}
 
+	// Default URL for the status page link in email notifications
+	if conf.StatusPageURL == "" {
+		conf.StatusPageURL = "https://gogios.buetow.org"
+		log.Println("Set StatusPageURL to " + conf.StatusPageURL)
+	}
+
 	return conf, nil
 }
 
diff --git a/internal/run.go b/internal/run.go
index f45f937..348bdd9 100644
--- a/internal/run.go
+++ b/internal/run.go
@@ -30,7 +30,7 @@ func Run(ctx context.Context, configFile string, renotify, force bool) {
 		notifyError(conf, err)
 	}
 
-	subject, body, doNotify := state.report(renotify, force)
+	subject, body, doNotify := state.report(renotify, force, conf.StatusPageURL)
 	if doNotify {
 		if err := notify(conf, subject, body); err != nil {
 			log.Println("error:", err)
diff --git a/internal/state.go b/internal/state.go
index 516e63a..cb2c665 100644
--- a/internal/state.go
+++ b/internal/state.go
@@ -130,7 +130,9 @@ func (s state) persist() error {
 	return os.WriteFile(s.stateFile, jsonData, os.ModePerm)
 }
 
-func (s state) report(renotify, force bool) (string, string, bool) {
+// report generates the notification email content.
+// statusPageURL is included as a link to the HTML status page.
+func (s state) report(renotify, force bool, statusPageURL string) (string, string, bool) {
 	var sb strings.Builder
 
 	sb.WriteString("This is the recent Gogios report!\n\n")
@@ -154,6 +156,10 @@ func (s state) report(renotify, force bool) (string, string, bool) {
 		sb.WriteString("There are no stale alerts...\n\n")
 	}
 
+	sb.WriteString("# Status page:\n\n")
+	sb.WriteString(statusPageURL)
+	sb.WriteString("\n\n")
+
 	sb.WriteString("Have a nice day!\n")
 
 	subject := fmt.Sprintf("GOGIOS Report [C:%d W:%d U:%d S:%d OK:%d]",