fix: matrix loops should be deterministic (#1784)

variables.go

@@ -11,6 +11,7 @@ import (
 	"github.com/go-task/task/v3/internal/execext"
 	"github.com/go-task/task/v3/internal/filepathext"
 	"github.com/go-task/task/v3/internal/fingerprint"
+	"github.com/go-task/task/v3/internal/omap"
 	"github.com/go-task/task/v3/internal/templater"
 	"github.com/go-task/task/v3/taskfile/ast"
 )
@@ -272,7 +273,7 @@ func itemsFromFor(
 	var keys []string // The list of keys to loop over (only if looping over a map)
 	var values []any  // The list of values to loop over
 	// Get the list from a matrix
-	if f.Matrix != nil {
+	if f.Matrix.Len() != 0 {
 		return asAnySlice(product(f.Matrix)), nil, nil
 	}
 	// Get the list from the explicit for list
@@ -328,24 +329,16 @@ func itemsFromFor(
 }
 
 // product generates the cartesian product of the input map of slices.
-func product(inputMap map[string][]any) []map[string]any {
-	if len(inputMap) == 0 {
+func product(inputMap omap.OrderedMap[string, []any]) []map[string]any {
+	if inputMap.Len() == 0 {
 		return nil
 	}
 
-	// Extract the keys and corresponding slices
-	keys := make([]string, 0, len(inputMap))
-	slices := make([][]any, 0, len(inputMap))
-	for key, slice := range inputMap {
-		keys = append(keys, key)
-		slices = append(slices, slice)
-	}
-
 	// Start with an empty product result
 	result := []map[string]any{{}}
 
 	// Iterate over each slice in the slices
-	for i, slice := range slices {
+	_ = inputMap.Range(func(key string, slice []any) error {
 		var newResult []map[string]any
 
 		// For each combination in the current result
@@ -358,14 +351,15 @@ func product(inputMap map[string][]any) []map[string]any {
 					newComb[k] = v
 				}
 				// Add the current item with the corresponding key
-				newComb[keys[i]] = item
+				newComb[key] = item
 				newResult = append(newResult, newComb)
 			}
 		}
 
 		// Update result with the new combinations
 		result = newResult
-	}
+		return nil
+	})
 
 	return result
 }