moved show related code

cmd/main.go

@@ -9,6 +9,7 @@ func main() {
 	opts, err := terra.WithDefaultRetryableErrors(&terra.Options{
 		TerraformDir:  "./tests",
 		StateFilePath: "./subdir/other-state.tfstate",
+		PlanFilePath:  "./subdir/other-plan.tfplan",
 	})
 	if err != nil {
 		panic(err)
@@ -38,6 +39,18 @@ func main() {
 	}
 	println(s)
 
+	println("===============")
+	println("===============")
+	println("=== show ======")
+	println("===============")
+	println("===============")
+
+	s, err = terra.Show(opts)
+	if err != nil {
+		panic(err)
+	}
+	println(s)
+
 	println("===============")
 	println("===============")
 	println("=== apply =====")

show.go

@@ -0,0 +1,16 @@
+package terra
+
+// Show calls terraform show in json mode with the given options and returns stdout from the command. If
+// PlanFilePath is set on the options, this will show the plan file. Otherwise, this will show the current state of the
+// terraform module at options.TerraformDir. This will fail the test if there is an error in the command.
+func Show(options *Options) (string, error) {
+	// We manually construct the args here instead of using `FormatArgs`, because show only accepts a limited set of
+	// args.
+	args := []string{"show", "-no-color", "-json"}
+
+	// Attach plan file path if specified.
+	if options.PlanFilePath != "" {
+		args = append(args, options.PlanFilePath)
+	}
+	return RunTerraformCommandAndGetStdoutE(options, args...)
+}