init: dec-music 项目初始化

log/log.go

@@ -0,0 +1,80 @@
+// Package log provides optional colored console logging, independent of decryption.
+package log
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"runtime"
+	"sync"
+	"time"
+)
+
+// Logger writes timestamped, colorized log lines to stderr.
+type Logger struct{}
+
+// New returns a logger instance.
+func New() *Logger { return &Logger{} }
+
+func (l *Logger) Debug(a ...any) { output(1, "cyan", a...) }
+func (l *Logger) Info(a ...any)  { output(1, "green", a...) }
+func (l *Logger) Warn(a ...any)  { output(1, "yellow", a...) }
+func (l *Logger) Error(a ...any) { output(1, "red", a...) }
+
+// With returns the same logger (scope is ignored; kept for call-site compatibility).
+func (l *Logger) With(_ any) *Logger { return l }
+
+// PrintSuccess prints a green/cyan success line for CLI use.
+func PrintSuccess(src, dst string) {
+	mu.Lock()
+	defer mu.Unlock()
+	fmt.Fprintf(os.Stderr, "%s %s: ", time.Now().Format("15:04:05.000"), trace(3))
+	fmt.Fprintf(os.Stderr, "操作成功: %s -> %s\n", green(src), cyan(dst))
+}
+
+var mu sync.Mutex
+
+func output(skip int, color string, v ...any) {
+	mu.Lock()
+	defer mu.Unlock()
+	fmt.Fprint(os.Stderr, time.Now().Format("15:04:05.000"), " ", trace(skip+2), " ")
+	fmt.Fprintln(os.Stderr, colorize(color, fmt.Sprint(v...)))
+}
+
+func trace(skip int) string {
+	_, file, line, ok := runtime.Caller(skip)
+	if !ok {
+		return "unknown:0"
+	}
+	return fmt.Sprintf("%s:%d", path.Base(file), line)
+}
+
+func colorize(color, s string) string {
+	if !supportsColor() {
+		return s
+	}
+	const reset = "\033[0m"
+	switch color {
+	case "red":
+		return "\033[31m" + s + reset
+	case "green":
+		return "\033[32m" + s + reset
+	case "yellow":
+		return "\033[33m" + s + reset
+	case "cyan":
+		return "\033[36m" + s + reset
+	default:
+		return s
+	}
+}
+
+func green(s string) string  { return colorize("green", s) }
+func cyan(s string) string   { return colorize("cyan", s) }
+
+func supportsColor() bool {
+	if os.Getenv("NO_COLOR") != "" {
+		return false
+	}
+	// Windows 10+ and most Unix terminals support ANSI.
+	return true
+}