diff --git a/go.mod b/go.mod
index ff9df1b..d428f6c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,11 @@
 module codeberg.org/danjones000/nomino
 
 go 1.23.6
+
+require github.com/stretchr/testify v1.10.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..713a0b4
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/options.go b/options.go
new file mode 100644
index 0000000..395925f
--- /dev/null
+++ b/options.go
@@ -0,0 +1,52 @@
+package nomino
+
+import "strings"
+
+type generator func() string
+
+type config struct {
+	original  string
+	prefix    string
+	suffix    string
+	extension string
+	generator generator
+}
+
+func defaultConf() config {
+	return config{
+		extension: ".txt",
+		generator: func() string { return "abc" },
+	}
+}
+
+type Option func(c *config)
+
+func WithOriginal(o string) Option {
+	return func(c *config) {
+		c.original = "_" + o
+	}
+}
+
+func WithPrefix(p string) Option {
+	return func(c *config) {
+		c.prefix = p + "_"
+	}
+}
+
+func WithSuffix(s string) Option {
+	return func(c *config) {
+		c.suffix = "_" + s
+	}
+}
+
+func WithoutExtension() Option {
+	return func(c *config) {
+		c.extension = ""
+	}
+}
+
+func WithExtension(ext string) Option {
+	return func(c *config) {
+		c.extension = "." + strings.TrimPrefix(ext, ".")
+	}
+}
diff --git a/options_test.go b/options_test.go
new file mode 100644
index 0000000..1c7486b
--- /dev/null
+++ b/options_test.go
@@ -0,0 +1,48 @@
+package nomino
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDefaultConf(t *testing.T) {
+	c := defaultConf()
+	assert.Equal(t, ".txt", c.extension)
+	// assert.Nil(t, c.generator)
+	assert.Equal(t, "abc", c.generator())
+}
+
+func TestWithOriginal(t *testing.T) {
+	var c config
+	name := "foobar"
+	WithOriginal(name)(&c)
+	assert.Equal(t, "_"+name, c.original)
+}
+
+func TestWithPrefix(t *testing.T) {
+	var c config
+	pref := "draft"
+	WithPrefix(pref)(&c)
+	assert.Equal(t, pref+"_", c.prefix)
+}
+
+func TestWithSuffix(t *testing.T) {
+	var c config
+	suff := "out"
+	WithSuffix(suff)(&c)
+	assert.Equal(t, "_"+suff, c.suffix)
+}
+
+func TestWithoutExtension(t *testing.T) {
+	c := config{extension: ".foobar"}
+	WithoutExtension()(&c)
+	assert.Equal(t, "", c.extension)
+}
+
+func TestWithExtension(t *testing.T) {
+	var c config
+	ext := "yaml"
+	WithExtension(ext)(&c)
+	assert.Equal(t, "."+ext, c.extension)
+}