Suppress binary output on terminal

formatter/binaryfilter.go

@@ -0,0 +1,30 @@
+package formatter
+
+import (
+	"bytes"
+	"io"
+	"strings"
+)
+
+type BinaryFilter struct {
+	Out    io.Writer
+	ignore bool
+}
+
+var binarySuppressNotice = []byte(strings.Join([]string{
+	"+-----------------------------------------+",
+	"| NOTE: binary data not shown in terminal |",
+	"+-----------------------------------------+\n",
+}, "\n"))
+
+func (bf *BinaryFilter) Write(p []byte) (n int, err error) {
+	if bf.ignore {
+		return len(p), nil
+	}
+	if bytes.IndexByte(p, 0) != -1 {
+		bf.ignore = true
+		bf.Out.Write(binarySuppressNotice)
+		return len(p), nil
+	}
+	return bf.Out.Write(p)
+}

main.go

@@ -57,6 +57,8 @@ func main() {
 				Out:    stdout,
 				Scheme: formatter.DefaultColorScheme,
 			}
+			// Filter out binary output.
+			stdout = &formatter.BinaryFilter{Out: stdout}
 		}
 		if pretty || terminal.IsTerminal(2) {
 			// If stderr is not redirected, output headers.