fix: Include information about imports in PlanSuccessStats (#3621)

* Include information about imports in PlanSuccessStats

Terraform 1.5 introduced a feature to import existing resources into
state via code.

https://developer.hashicorp.com/terraform/language/import

When you run `terraform plan` with imports, the output includes information
about the imported resources, which breaks the current regex for parsing
plan changes.

This PR updates the regex to include the, optional, import information.

* Use the ?

Co-authored-by: Benjamin Ullian <5695343+bnu0@users.noreply.github.com>

---------

Co-authored-by: Will Richard <wrichard@seatgeek.com>
Co-authored-by: Benjamin Ullian <5695343+bnu0@users.noreply.github.com>
Co-authored-by: Dylan Page <dylan.page@autodesk.com>

server/events/models/models.go

@@ -385,7 +385,7 @@ type PolicySetStatus struct {
 // Summary regexes
 var (
 	reChangesOutside = regexp.MustCompile(`Note: Objects have changed outside of Terraform`)
-	rePlanChanges    = regexp.MustCompile(`Plan: (\d+) to add, (\d+) to change, (\d+) to destroy.`)
+	rePlanChanges    = regexp.MustCompile(`Plan: (?:(\d+) to import, )?(\d+) to add, (\d+) to change, (\d+) to destroy.`)
 	reNoChanges      = regexp.MustCompile(`No changes. (Infrastructure is up-to-date|Your infrastructure matches the configuration).`)
 )
 
@@ -631,8 +631,8 @@ type WorkflowHookCommandContext struct {
 
 // PlanSuccessStats holds stats for a plan.
 type PlanSuccessStats struct {
-	Add, Change, Destroy    int
-	Changes, ChangesOutside bool
+	Import, Add, Change, Destroy int
+	Changes, ChangesOutside      bool
 }
 
 func NewPlanSuccessStats(output string) PlanSuccessStats {
@@ -647,9 +647,10 @@ func NewPlanSuccessStats(output string) PlanSuccessStats {
 		// We can skip checking the error here as we can assume
 		// Terraform output will always render an integer on these
 		// blocks.
-		s.Add, _ = strconv.Atoi(m[1])
-		s.Change, _ = strconv.Atoi(m[2])
-		s.Destroy, _ = strconv.Atoi(m[3])
+		s.Import, _ = strconv.Atoi(m[1])
+		s.Add, _ = strconv.Atoi(m[2])
+		s.Change, _ = strconv.Atoi(m[3])
+		s.Destroy, _ = strconv.Atoi(m[4])
 	}
 
 	return s

server/events/models/models_test.go

@@ -368,6 +368,10 @@ func TestPlanSuccess_Summary(t *testing.T) {
 			"dummy\nPlan: 100 to add, 111 to change, 222 to destroy.",
 			"Plan: 100 to add, 111 to change, 222 to destroy.",
 		},
+		{
+			"dummy\nPlan: 42 to import, 53 to add, 64 to change, 75 to destroy.",
+			"Plan: 42 to import, 53 to add, 64 to change, 75 to destroy.",
+		},
 		{
 			"Note: Objects have changed outside of Terraform\ndummy\nNo changes. Infrastructure is up-to-date.",
 			"\n**Note: Objects have changed outside of Terraform**\nNo changes. Infrastructure is up-to-date.",
@@ -629,6 +633,7 @@ func TestPlanSuccessStats(t *testing.T) {
 					Plan: 1 to add, 3 to change, 2 to destroy.`,
 			models.PlanSuccessStats{
 				Changes: true,
+
 				Add:     1,
 				Change:  3,
 				Destroy: 2,
@@ -651,6 +656,25 @@ func TestPlanSuccessStats(t *testing.T) {
 				ChangesOutside: true,
 			},
 		},
+		{
+			"with imports",
+			`Terraform used the selected providers to generate the following execution
+			plan. Resource actions are indicated with the following symbols:	
+			  + create
+			  ~ update in-place
+			  - destroy
+			Terraform will perform the following actions:
+			  - null_resource.hi[1]
+			Plan: 42 to import, 31 to add, 20 to change, 1 to destroy.`,
+			models.PlanSuccessStats{
+				Changes: true,
+
+				Import:  42,
+				Add:     31,
+				Change:  20,
+				Destroy: 1,
+			},
+		},
 		{
 			"changes and changes outside",
 			`Note: Objects have changed outside of Terraform