Respect editorconfig formatting

internal/topdata/topdata_test.go

@@ -1148,6 +1148,87 @@ func TestSaveLockfilePreservesExistingOrderAndAppendsNewKeys(t *testing.T) {
 	}
 }
 
+func TestSaveLockfileUsesEditorConfigJSONFormatting(t *testing.T) {
+	root := t.TempDir()
+	writeFile(t, filepath.Join(root, ".editorconfig"), `root = true
+
+[topdata/data/*.json]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+
+[topdata/data/**/*.json]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+`)
+	lockPath := filepath.Join(root, "topdata", "data", "feat", "lock.json")
+	mkdirAll(t, filepath.Dir(lockPath))
+	writeFile(t, lockPath, "{\n    \"b\": 2,\n    \"a\": 1\n}\n")
+
+	if err := saveLockfile(lockPath, map[string]int{
+		"b": 2,
+		"a": 1,
+		"c": 3,
+	}); err != nil {
+		t.Fatalf("saveLockfile failed: %v", err)
+	}
+
+	got, err := os.ReadFile(lockPath)
+	if err != nil {
+		t.Fatalf("read lockfile: %v", err)
+	}
+	want := "{\n    \"b\": 2,\n    \"a\": 1,\n    \"c\": 3\n}\n"
+	if string(got) != want {
+		t.Fatalf("unexpected lockfile contents:\n%s", string(got))
+	}
+}
+
+func TestSaveNativeLockfilesNormalizesEditorConfigFormattingWhenDataIsUnchanged(t *testing.T) {
+	root := t.TempDir()
+	writeFile(t, filepath.Join(root, ".editorconfig"), `root = true
+
+[topdata/data/**/*.json]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+`)
+	lockPath := filepath.Join(root, "topdata", "data", "feat", "lock.json")
+	mkdirAll(t, filepath.Dir(lockPath))
+	writeFile(t, lockPath, "{\n  \"feat:a\": 1,\n  \"feat:b\": 2\n}\n")
+
+	added, pruned, err := saveNativeLockfiles([]nativeCollectedDataset{
+		{
+			Dataset: nativeDataset{
+				Name:     "feat",
+				LockPath: lockPath,
+			},
+			LockData: map[string]int{
+				"feat:a": 1,
+				"feat:b": 2,
+			},
+		},
+	})
+	if err != nil {
+		t.Fatalf("saveNativeLockfiles failed: %v", err)
+	}
+	if added != 0 || pruned != 0 {
+		t.Fatalf("expected formatting-only normalization not to count as lock data change, got added=%d pruned=%d", added, pruned)
+	}
+
+	got, err := os.ReadFile(lockPath)
+	if err != nil {
+		t.Fatalf("read lockfile: %v", err)
+	}
+	want := "{\n    \"feat:a\": 1,\n    \"feat:b\": 2\n}\n"
+	if string(got) != want {
+		t.Fatalf("unexpected lockfile contents:\n%s", string(got))
+	}
+}
+
 func TestBuildNativeAllocatesConfiguredDatasetsIntoFirstNullBaseRows(t *testing.T) {
 	root := testProjectRoot(t)
 	mkdirAll(t, filepath.Join(root, "topdata", "data", "portraits", "modules"))