Remove dependency on xerrors

Author: earthboundkid

code.go

@@ -1,10 +1,9 @@
 package exitcode
 
 import (
+	"errors"
 	"flag"
 	"os"
-
-	"golang.org/x/xerrors"
 )
 
 // Coder is an interface to control what value Get returns.
@@ -24,11 +23,11 @@ func Get(err error) int {
 		return 0
 	}
 
-	if coder := Coder(nil); xerrors.As(err, &coder) {
+	if coder := Coder(nil); errors.As(err, &coder) {
 		return coder.ExitCode()
 	}
 
-	if xerrors.Is(err, flag.ErrHelp) {
+	if errors.Is(err, flag.ErrHelp) {
 		return 2
 	}
 

code_test.go

@@ -3,15 +3,15 @@ package exitcode_test
 import (
 	"errors"
 	"flag"
+	"fmt"
 	"testing"
 
 	"github.com/carlmjohnson/exitcode"
-	"golang.org/x/xerrors"
 )
 
 func TestGet(t *testing.T) {
 	base := exitcode.Set(errors.New(""), 4)
-	wrapped := xerrors.Errorf("wrapping: %w", base)
+	wrapped := fmt.Errorf("wrapping: %w", base)
 
 	testCases := map[string]struct {
 		error
@@ -38,7 +38,7 @@ func TestGet(t *testing.T) {
 
 func TestSet(t *testing.T) {
 	t.Run("same-message", func(t *testing.T) {
-		err := xerrors.New("hello")
+		err := errors.New("hello")
 		coder := exitcode.Set(err, 2)
 		got := err.Error()
 		want := coder.Error()
@@ -47,10 +47,10 @@ func TestSet(t *testing.T) {
 		}
 	})
 	t.Run("keep-chain", func(t *testing.T) {
-		err := xerrors.New("hello")
+		err := errors.New("hello")
 		coder := exitcode.Set(err, 3)
 
-		if !xerrors.Is(coder, err) {
+		if !errors.Is(coder, err) {
 			t.Errorf("broken chain: %v is not %v", coder, err)
 		}
 	})

go.mod

@@ -1,5 +1,3 @@
 module github.com/carlmjohnson/exitcode
 
-go 1.12
-
-require golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898
+go 1.13

go.sum

@@ -1,2 +0,0 @@
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898 h1:/atklqdjdhuosWIl6AIbOeHJjicWYPqR9bpxqxYG2pA=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=