default to compile in, but also allow plugins

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

walker/walkers/writeNumFuzz/fuzz.go

@@ -0,0 +1,17 @@
+package writeNumFuzz
+
+import (
+	"os"
+
+	"git.thisco.de/vbatts/fuzz-walker/walker"
+)
+
+func init() {
+	walker.RegisterFuzzFunc(Name, FuzzFunc)
+}
+
+const Name = "writeNumFuzz"
+
+func FuzzFunc(path string, info os.FileInfo) error {
+	return nil
+}

walker/walkers/writeNumFuzz/plugin.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package main
 
 import (
@@ -5,6 +7,7 @@ import (
 	"time"
 
 	"git.thisco.de/vbatts/fuzz-walker/walker"
+	"git.thisco.de/vbatts/fuzz-walker/walker/walkers/writeNumFuzz"
 )
 
 // NewFuzzer creates the fuzzer for this plugin
@@ -15,17 +18,9 @@ func NewFuzzer() (walker.Fuzzer, error) {
 type myFuzzer struct{}
 
 func (mf myFuzzer) Name() string {
-	return "writeNumFuzz"
+	return writeNumFuzz.Name
 }
 
 func (mf myFuzzer) Func(path string, info os.FileInfo, timeout time.Duration) error {
-	if !info.Mode().IsRegular() {
-		return nil
-	}
-	fd, err := os.Open(path)
-	if err != nil {
-		return err
-	}
-	defer fd.Close()
-	return nil
+	return writeNumFuzz.Func(path, info)
 }