Define contract for turbine response and capture

cmd/meroxa/turbine_cli/javascript/deploy.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -13,15 +14,25 @@ import (
 	"github.com/meroxa/cli/log"
 )
 
+func processError(err error, path string, output []byte) (bool, error) {
+	fmterr := fmt.Errorf(
+		"unable to determine if the Meroxa Application at %s has a Process; %s",
+		path,
+		string(output))
+	return false, fmterr
+}
+
 func NeedsToBuild(path string) (bool, error) {
 	cmd := exec.Command("npx", "turbine", "hasfunctions", path)
 	output, err := cmd.CombinedOutput()
 	if err != nil {
-		err := fmt.Errorf(
-			"unable to determine if the Meroxa Application at %s has a Process; %s",
-			path,
-			string(output))
-		return false, err
+		return processError(err, path, output)
+	}
+
+	r, _ := regexp.Compile("\nturbine-response: (true|false)\n")
+	match := r.FindString(string(output))
+	if match == "" {
+		return processError(err, path, output)
 	}
 	return strconv.ParseBool(strings.TrimSpace(string(output)))
 }