util: file path finder

Convenience to walk a directory tree looking for a file like
"ChangeLog.txt"

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

util/find.go

@@ -0,0 +1,23 @@
+package util
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func FindFiles(root, name string) (paths []string, err error) {
+	paths = []string{}
+	err = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if filepath.Base(path) == name {
+			paths = append(paths, path)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return paths, nil
+}

util/find_test.go

@@ -0,0 +1,14 @@
+package util
+
+import "testing"
+
+func TestFind(t *testing.T) {
+	paths, err := FindFiles("../changelog", "ChangeLog.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(paths) != 1 {
+		t.Errorf("expected to find %d file, but found %d", 1, len(paths))
+	}
+}