cmd/ent: replace entc with ent (#989)

See #981

cmd/internal/base/packages_test.go

@@ -0,0 +1,49 @@
+// Copyright 2019-present Facebook Inc. All rights reserved.
+// This source code is licensed under the Apache 2.0 license found
+// in the LICENSE file in the root directory of this source tree.
+
+package base
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/tools/go/packages/packagestest"
+)
+
+func TestPkgPath(t *testing.T) { packagestest.TestAll(t, testPkgPath) }
+func testPkgPath(t *testing.T, x packagestest.Exporter) {
+	e := packagestest.Export(t, x, []packagestest.Module{
+		{
+			Name: "golang.org/x",
+			Files: map[string]interface{}{
+				"x.go":   "package x",
+				"y/y.go": "package y",
+			},
+		},
+	})
+	defer e.Cleanup()
+
+	e.Config.Dir = filepath.Dir(e.File("golang.org/x", "x.go"))
+	target := filepath.Join(e.Config.Dir, "ent")
+	pkgPath, err := PkgPath(e.Config, target)
+	require.NoError(t, err)
+	require.Equal(t, "golang.org/x/ent", pkgPath)
+
+	e.Config.Dir = filepath.Dir(e.File("golang.org/x", "y/y.go"))
+	target = filepath.Join(e.Config.Dir, "ent")
+	pkgPath, err = PkgPath(e.Config, target)
+	require.NoError(t, err)
+	require.Equal(t, "golang.org/x/y/ent", pkgPath)
+
+	target = filepath.Join(e.Config.Dir, "z/ent")
+	pkgPath, err = PkgPath(e.Config, target)
+	require.NoError(t, err)
+	require.Equal(t, "golang.org/x/y/z/ent", pkgPath)
+
+	target = filepath.Join(e.Config.Dir, "z/e/n/t")
+	pkgPath, err = PkgPath(e.Config, target)
+	require.Error(t, err)
+	require.Empty(t, pkgPath)
+}