Add debug mode to log

logging/log.go

@@ -0,0 +1,34 @@
+package logging
+
+import (
+	"io"
+	"log"
+	"log/slog"
+	"os"
+
+	"git.a71.su/Andrew71/pye/config"
+)
+
+// LogInit makes slog output to both os.Stdout and a file if needed, and sets slog.LevelDebug if enabled.
+func LogInit(debugMode bool) {
+	var w io.Writer
+	if config.Cfg.LogToFile {
+		f, err := os.OpenFile(config.Cfg.LogFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+		if err != nil {
+			slog.Error("error opening log file, logging to stdout only", "path", config.Cfg.LogFile, "error", err)
+			return
+		}
+		// No defer f.Close() because that breaks the MultiWriter
+		w = io.MultiWriter(f, os.Stdout)
+	} else {
+		w = os.Stdout
+	}
+
+	// Make slog use intended format
+	var opts *slog.HandlerOptions
+	if debugMode {
+		opts = &slog.HandlerOptions{Level: slog.LevelDebug}
+	}
+	slog.SetDefault(slog.New(slog.NewTextHandler(w, opts)))
+	log.SetFlags(log.LstdFlags | log.Lshortfile)
+}