Adding file namespace

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

2 files changed, 88 insertions, 0 deletions

diff --git a/file/file.go b/file/file.go
new file mode 100644
index 00000000..10f58a41
--- /dev/null
+++ b/file/file.go
@@ -0,0 +1,45 @@
+package file
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/spf13/afero"
+)
+
+// for overriding in tests
+var fs = afero.NewOsFs()
+
+// Read -
+func Read(filename string) (string, error) {
+	inFile, err := fs.OpenFile(filename, os.O_RDONLY, 0)
+	if err != nil {
+		return "", fmt.Errorf("failed to open %s\n%v", filename, err)
+	}
+	// nolint: errcheck
+	defer inFile.Close()
+	bytes, err := ioutil.ReadAll(inFile)
+	if err != nil {
+		err = fmt.Errorf("read failed for %s\n%v", filename, err)
+		return "", err
+	}
+	return string(bytes), nil
+}
+
+// ReadDir -
+func ReadDir(path string) ([]string, error) {
+	f, err := fs.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	i, err := f.Stat()
+	if err != nil {
+		return nil, err
+	}
+	if i.IsDir() {
+		return f.Readdirnames(0)
+	}
+	return nil, errors.New("file is not a directory")
+}
diff --git a/file/file_test.go b/file/file_test.go
new file mode 100644
index 00000000..97cfa0fb
--- /dev/null
+++ b/file/file_test.go
@@ -0,0 +1,43 @@
+package file
+
+import (
+	"testing"
+
+	"github.com/spf13/afero"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRead(t *testing.T) {
+	origfs := fs
+	defer func() { fs = origfs }()
+	fs = afero.NewMemMapFs()
+	_ = fs.Mkdir("/tmp", 0777)
+	f, _ := fs.Create("/tmp/foo")
+	_, _ = f.Write([]byte("foo"))
+
+	actual, err := Read("/tmp/foo")
+	assert.NoError(t, err)
+	assert.Equal(t, "foo", actual)
+
+	actual, err = Read("/tmp/bar")
+	assert.Error(t, err)
+}
+
+func TestReadDir(t *testing.T) {
+	origfs := fs
+	defer func() { fs = origfs }()
+	fs = afero.NewMemMapFs()
+	fs.Mkdir("/tmp", 0777)
+	fs.Create("/tmp/foo")
+	fs.Create("/tmp/bar")
+	fs.Create("/tmp/baz")
+	fs.Mkdir("/tmp/qux", 0777)
+	fs.Create("/tmp/qux/quux")
+
+	actual, err := ReadDir("/tmp")
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"bar", "baz", "foo", "qux"}, actual)
+
+	_, err = ReadDir("/tmp/foo")
+	assert.Error(t, err)
+}