From d1c1ab0a7502afa30f04309aee85a346baf34295 Mon Sep 17 00:00:00 2001
From: Mike Farah <mikefarah@gmail.com>
Date: Thu, 30 Jan 2020 16:34:43 +1100
Subject: [PATCH] Added validate command

---
 cmd/commands_test.go | 25 ++++++++++++++++++++++++-
 cmd/root.go          |  1 +
 cmd/validate.go      | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 1 deletion(-)
 create mode 100644 cmd/validate.go

diff --git a/cmd/commands_test.go b/cmd/commands_test.go
index 1d96a28..19217ab 100644
--- a/cmd/commands_test.go
+++ b/cmd/commands_test.go
@@ -94,6 +94,15 @@ func TestReadCmd(t *testing.T) {
 	test.AssertResult(t, "2", result.Output)
 }
 
+func TestValidateCmd(t *testing.T) {
+	cmd := getRootCommand()
+	result := test.RunCmd(cmd, "validate ../examples/sample.yaml b.c")
+	if result.Error != nil {
+		t.Error(result.Error)
+	}
+	test.AssertResult(t, "", result.Output)
+}
+
 func TestReadWithAdvancedFilterCmd(t *testing.T) {
 	cmd := getRootCommand()
 	result := test.RunCmd(cmd, "read -v ../examples/sample.yaml b.e(name==sam).value")
@@ -547,7 +556,21 @@ func TestReadBadDataCmd(t *testing.T) {
 	cmd := getRootCommand()
 	result := test.RunCmd(cmd, fmt.Sprintf("read %s", filename))
 	if result.Error == nil {
-		t.Error("Expected command to fail due to invalid path")
+		t.Error("Expected command to fail")
+	}
+	expectedOutput := `yaml: line 1: did not find expected ',' or ']'`
+	test.AssertResult(t, expectedOutput, result.Error.Error())
+}
+
+func TestValidateBadDataCmd(t *testing.T) {
+	content := `[!Whatever]`
+	filename := test.WriteTempYamlFile(content)
+	defer test.RemoveTempYamlFile(filename)
+
+	cmd := getRootCommand()
+	result := test.RunCmd(cmd, fmt.Sprintf("validate %s", filename))
+	if result.Error == nil {
+		t.Error("Expected command to fail")
 	}
 	expectedOutput := `yaml: line 1: did not find expected ',' or ']'`
 	test.AssertResult(t, expectedOutput, result.Error.Error())
diff --git a/cmd/root.go b/cmd/root.go
index 84e4703..f8eb8f6 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -44,6 +44,7 @@ func New() *cobra.Command {
 
 	rootCmd.AddCommand(
 		createReadCmd(),
+		createValidateCmd(),
 		createWriteCmd(),
 		createPrefixCmd(),
 		createDeleteCmd(),
diff --git a/cmd/validate.go b/cmd/validate.go
new file mode 100644
index 0000000..2527168
--- /dev/null
+++ b/cmd/validate.go
@@ -0,0 +1,37 @@
+package cmd
+
+import (
+	errors "github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+func createValidateCmd() *cobra.Command {
+	var cmdRead = &cobra.Command{
+		Use:     "validate [yaml_file]",
+		Aliases: []string{"v"},
+		Short:   "yq v sample.yaml",
+		Example: `
+yq v - # reads from stdin
+`,
+		RunE:          validateProperty,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+	}
+	cmdRead.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
+	return cmdRead
+}
+
+func validateProperty(cmd *cobra.Command, args []string) error {
+	if len(args) < 1 {
+		return errors.New("Must provide filename")
+	}
+
+	var updateAll, docIndexInt, errorParsingDocIndex = parseDocumentIndex()
+	if errorParsingDocIndex != nil {
+		return errorParsingDocIndex
+	}
+
+	_, errorReadingStream := readYamlFile(args[0], "", updateAll, docIndexInt)
+
+	return errorReadingStream
+}