Validate pipeline file using sem validate FILE

When you're authoring files locally it's a pain pushing changes to
double-check the YAML syntax is corrected, that you've nested the blocks
correctly and that you've put your `run:` clause at the right level.
Make it easy to validate the syntax of the file from local machines.

Author: caius

cmd/validate.go

@@ -0,0 +1,53 @@
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	client "github.com/semaphoreci/cli/api/client"
+	"github.com/semaphoreci/cli/cmd/utils"
+	"github.com/spf13/cobra"
+)
+
+type YamlBody struct {
+	YamlDefinition string `json:"yaml_definition"`
+}
+
+var validateCmd = &cobra.Command{
+	Use:   "validate",
+	Short: "Validate a pipeline yaml file",
+	Long:  "",
+	Run: func(cmd *cobra.Command, args []string) {
+		c := client.NewBaseClientFromConfig()
+
+		if len(args) != 1 {
+			fmt.Println("Usage: sem validate [PATH_TO_YAML_FILE]")
+			os.Exit(1)
+		}
+
+		fileContent, err := os.ReadFile(args[0])
+		utils.Check(err)
+
+		body := YamlBody{
+			YamlDefinition: string(fileContent),
+		}
+
+		json_body, err := json.Marshal(body)
+		utils.Check(err)
+
+		response, status, err := c.Post("yaml", json_body)
+		utils.Check(err)
+
+		if status == 200 {
+			fmt.Println("Valid!")
+		} else {
+			fmt.Println("Not valid!")
+		}
+		fmt.Println(string(response))
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(validateCmd)
+}