Added ability to ignore fields by name or type.

spew/config.go

@@ -98,11 +98,15 @@ type ConfigState struct {
 	// be spewed to strings and sorted by those strings.  This is only
 	// considered if SortKeys is true.
 	SpewKeys bool
+
+	// Name of fields to ignore
+	ignoreFieldByName map[string]bool
+	ignoreFieldByType map[string]bool
 }
 
 // Config is the active configuration of the top-level functions.
 // The configuration can be changed by modifying the contents of spew.Config.
-var Config = ConfigState{Indent: " "}
+var Config = ConfigState{Indent: " ", ignoreFieldByName: make(map[string]bool), ignoreFieldByType: make(map[string]bool)}
 
 // Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns

spew/dump.go

@@ -413,6 +413,16 @@ func (d *dumpState) dump(v reflect.Value) {
 			vt := v.Type()
 			numFields := v.NumField()
 			for i := 0; i < numFields; i++ {
+				// Ignore?
+				n := vt.Field(i).Name
+				if _, ok := Config.ignoreFieldByName[n]; ok {
+					continue
+				}
+				n = vt.Field(i).Type.String()
+				if _, ok := Config.ignoreFieldByType[n]; ok {
+					continue
+				}
+
 				d.indent()
 				vtf := vt.Field(i)
 				d.w.Write([]byte(vtf.Name))
@@ -481,6 +491,18 @@ func Sdump(a ...interface{}) string {
 	return buf.String()
 }
 
+func IgnoreFieldByName(f string) {
+	Config.ignoreFieldByName[f] = true
+}
+
+func IgnoreFieldByType(f string) {
+	Config.ignoreFieldByType[f] = true
+	// And arrays of the type
+	Config.ignoreFieldByType["[]"+f] = true
+	// And pointers to the type
+	Config.ignoreFieldByType["*"+f] = true
+}
+
 /*
 Dump displays the passed parameters to standard out with newlines, customizable
 indentation, and additional debug information such as complete types and all