ConfigState: Create 'DisableLengths' option

spew/config.go

@@ -76,6 +76,10 @@ type ConfigState struct {
 	// data structures in tests.
 	DisableCapacities bool
 
+	// DisableLengths specifies whether to disable the printing of lengths
+	// for strings, arrays, slices, maps and channels.
+	DisableLengths bool
+
 	// ContinueOnMethod specifies whether or not recursion should continue once
 	// a custom error or Stringer interface is invoked.  The default, false,
 	// means it will print the results of invoking the custom error or Stringer

spew/dump.go

@@ -275,6 +275,7 @@ func (d *dumpState) dump(v reflect.Value) {
 
 	// Display length and capacity if the built-in len and cap functions
 	// work with the value's kind and the len/cap itself is non-zero.
+	if !d.cs.DisableLengths {
 		valueLen, valueCap := 0, 0
 		switch v.Kind() {
 		case reflect.Array, reflect.Slice, reflect.Chan:
@@ -298,6 +299,7 @@ func (d *dumpState) dump(v reflect.Value) {
 			d.w.Write(closeParenBytes)
 			d.w.Write(spaceBytes)
 		}
+	}
 
 	// Call Stringer/error interfaces if they exist and the handle methods flag
 	// is enabled

spew/spew_test.go

@@ -132,6 +132,7 @@ func initSpewTests() {
 	scsContinue := &spew.ConfigState{Indent: " ", ContinueOnMethod: true}
 	scsNoPtrAddr := &spew.ConfigState{DisablePointerAddresses: true}
 	scsNoCap := &spew.ConfigState{DisableCapacities: true}
+	scsNoLen := &spew.ConfigState{DisableLengths: true}
 
 	// Variables for tests on types which implement Stringer interface with and
 	// without a pointer receiver.
@@ -203,6 +204,7 @@ func initSpewTests() {
 		{scsNoPtrAddr, fCSSdump, "", tptr, "(*spew_test.ptrTester)({\ns: (*struct {})({\n})\n})\n"},
 		{scsNoCap, fCSSdump, "", make([]string, 0, 10), "([]string) {\n}\n"},
 		{scsNoCap, fCSSdump, "", make([]string, 1, 10), "([]string) (len=1) {\n(string) \"\"\n}\n"},
+		{scsNoLen, fCSSdump, "", make([]string, 1, 10), "([]string) {\n(string) \"\"\n}\n"},
 	}
 }