Add command validate to check for parse errors

Gopkg.toml

@@ -41,3 +41,11 @@
 [prune]
   go-tests = true
   unused-packages = true
+
+[[constraint]]
+  name = "gopkg.in/go-playground/validator.v9"
+  version = "9.28.0"
+
+[[constraint]]
+  name = "github.com/go-playground/universal-translator"
+  version = "0.16.0"

cmd/validate.go

@@ -0,0 +1,42 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/leopardslab/dunner/pkg/config"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func init() {
+	rootCmd.AddCommand(validateCmd)
+}
+
+var validateCmd = &cobra.Command{
+	Use:   "validate",
+	Short: "Validate the dunner task file `.dunner.yaml`",
+	Long:  "You can validate task file `.dunner.yaml` with this command to see if there are any parse errors",
+	Run:   Validate,
+	Args:  cobra.MinimumNArgs(0),
+}
+
+// Validate command invoked from command line, validates the dunner task file. If there are errors, it fails with non-zero exit code.
+func Validate(_ *cobra.Command, args []string) {
+	var dunnerFile = viper.GetString("DunnerTaskFile")
+
+	configs, err := config.GetConfigs(dunnerFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	errs := configs.Validate()
+	if len(errs) != 0 {
+		fmt.Println("Validation failed with following errors:")
+		for _, err := range errs {
+			fmt.Println(err.Error())
+		}
+		os.Exit(1)
+	}
+	fmt.Println("Validation successful!")
+}

internal/util/util.go

@@ -0,0 +1,22 @@
+package util
+
+import (
+	"os"
+	"path"
+	"strings"
+)
+
+// HomeDir is the environment variable HOME
+var HomeDir = os.Getenv("HOME")
+
+// DirExists returns true if the given param is a valid existing directory
+func DirExists(dir string) bool {
+	if strings.HasPrefix(dir, "~") {
+		dir = path.Join(HomeDir, strings.Trim(dir, "~"))
+	}
+	src, err := os.Stat(dir)
+	if err != nil {
+		return false
+	}
+	return src.IsDir()
+}

internal/util/util_test.go

@@ -0,0 +1,51 @@
+package util
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestDirExistsSuccess(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "TestDir")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	exists := DirExists(tmpdir)
+
+	if !exists {
+		t.Fatalf("Directory exists; but got false")
+	}
+}
+
+func TestDirExistsFail(t *testing.T) {
+	exists := DirExists("this path is invalid")
+
+	if exists {
+		t.Fatalf("Directory invalid; but got as exists")
+	}
+}
+
+func TestDirExistsFailForFile(t *testing.T) {
+	tmpfile, err := ioutil.TempFile("", "TestFileExists")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpfile.Name())
+
+	exists := DirExists(tmpfile.Name())
+
+	if exists {
+		t.Fatalf("Not a directory; but got as true")
+	}
+}
+
+func TestDirExistsIfNotAbsPath(t *testing.T) {
+	exists := DirExists("~/invalidpathfortesting")
+
+	if exists {
+		t.Fatalf("Not a directory; but got as true")
+	}
+}