Write log output to file

.gitignore

@@ -13,9 +13,3 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
-
-# Configuration files
-*.json
-
-# Database files
-*.sqlite

log.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+)
+
+type LogWriter struct {
+	f *os.File
+}
+
+func (lw *LogWriter) Write(p []byte) (n int, err error) {
+	n, err = os.Stderr.Write(p)
+	if err != nil {
+		return
+	}
+
+	return lw.f.Write(p)
+}
+
+func init() {
+	executable, err := os.Executable()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	path := filepath.Dir(executable) + "/latest.log"
+	f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	go func() {
+		defer f.Close()
+		select {}
+	}()
+
+	lw := &LogWriter{f}
+	log.SetOutput(lw)
+}