Hint to use --update when contract exists during deploy (#2111)

Author: jribbink

internal/project/deploy.go

@@ -22,6 +22,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strings"
 
 	"github.com/onflow/flow-cli/internal/prompt"
 
@@ -81,13 +82,20 @@ func deploy(
 	if err != nil {
 		var projectErr *flowkit.ProjectDeploymentError
 		if errors.As(err, &projectErr) {
+			showUpdateHint := false
 			for name, err := range projectErr.Contracts() {
 				logger.Info(fmt.Sprintf(
 					"%s Failed to deploy contract %s: %s",
 					output.ErrorEmoji(),
 					name,
 					err.Error(),
 				))
+				if !deployFlags.Update && (strings.Contains(err.Error(), "exists in account") || strings.Contains(err.Error(), "already exists")) {
+					showUpdateHint = true
+				}
+			}
+			if showUpdateHint {
+				logger.Info(fmt.Sprintf("%s Contract already exists. To update it, run: flow project deploy --update", output.TryEmoji()))
 			}
 			return nil, fmt.Errorf("failed deploying all contracts")
 		}