feat: [NA] handle config print in case of nil processor instance (#25)

processor.go

@@ -101,18 +101,35 @@ func (p *Processor) Format(val any) string {
 }
 
 // PrintConfig prints the configuration of the censor Processor.
+//
+//nolint:gomnd
 func (p *Processor) PrintConfig() {
-	const (
-		lineLength = 69
-		padLength  = 10
-	)
-
-	line := strings.Repeat("-", lineLength) + "\n"
+	const lineLength = 69
 
 	var b strings.Builder
-	b.WriteString(line)
-	b.WriteString(strings.Repeat(" ", padLength) + "Censor is configured with the following settings:" + "\n")
-	b.WriteString(line)
+
+	writeLine := func() {
+		b.WriteString(strings.Repeat("-", lineLength) + "\n")
+	}
+
+	// Handle the case when the censor instance isn't initialized.
+	if p == nil {
+		const text = "Censor instance isn't initialized"
+
+		writeLine()
+		b.WriteString(strings.Repeat(" ", (lineLength-len(text))/2) + text + "\n")
+		writeLine()
+
+		fmt.Print(b.String())
+
+		return
+	}
+
+	const text = "Censor is configured with the following settings:"
+
+	writeLine()
+	b.WriteString(strings.Repeat(" ", (lineLength-len(text))/2) + text + "\n")
+	writeLine()
 
 	cfg := config.Config{
 		General:   p.cfg.General,
@@ -131,7 +148,8 @@ func (p *Processor) PrintConfig() {
 
 	b.Write(d)
 
-	b.WriteString(line)
+	writeLine()
+
 	fmt.Print(b.String())
 }
 

processor_test.go

@@ -808,4 +808,27 @@ func TestProcessor_PrintConfig(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, want, got)
 	})
+
+	t.Run("not initialized instance", func(t *testing.T) {
+		r, w, err := os.Pipe()
+		require.NoError(t, err)
+
+		// Store previous stdout and replace it with our pipe.
+		stdout := os.Stdout
+		os.Stdout = w
+
+		var p *Processor
+		p.PrintConfig()
+
+		// Restore stdout.
+		os.Stdout = stdout
+
+		want := []byte{0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0xa, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x43, 0x65, 0x6e, 0x73, 0x6f, 0x72, 0x20, 0x69, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x63, 0x65, 0x20, 0x69, 0x73, 0x6e, 0x27, 0x74, 0x20, 0x69, 0x6e, 0x69, 0x74, 0x69, 0x61, 0x6c, 0x69, 0x7a, 0x65, 0x64, 0xa, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0x2d, 0xa}
+
+		// Read from the pipe.
+		got := make([]byte, 192)
+		_, err = r.Read(got)
+		require.NoError(t, err)
+		require.Equal(t, want, got)
+	})
 }