[clang] [clang-format] Add new option: WrapNamespaceBodyWithNewlines (PR #106145)

[Owen Pan via cfe-commits]

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@@ -28104,6 +28104,253 @@ TEST_F(FormatTest, BreakBinaryOperations) {
                Style);
 }
 
+TEST_F(FormatTest, WrapNamespaceBodyWithEmptyLinesNever) {
+  FormatStyle Style = getLLVMStyle();
+  Style.FixNamespaceComments = false;
+  Style.ShortNamespaceLines = 0;
+  Style.MaxEmptyLinesToKeep = 2;
+  Style.WrapNamespaceBodyWithEmptyLines = FormatStyle::WNBWELS_Never;
+  Style.CompactNamespaces = false;
+
+  // Empty namespace
+  verifyNoChange("namespace N {};", Style);
+
+  // Single namespace
+  verifyNoChange("namespace N {\n"
+                 "int f1(int a) { return 2 * a; }\n"
+                 "};",
+                 Style);
+
+  // Nested namespace
+  verifyNoChange("namespace N1 {\n"
+                 "namespace N2 {\n"
+                 "namespace N3 {\n"
+                 "int f1() {\n"
+                 "  int a = 1;\n"
+                 "  return a;\n"
+                 "}\n"
+                 "}\n"
+                 "}\n"
+                 "}",
+                 Style);
+
+  Style.CompactNamespaces = true;
+
+  // Empty namespace
+  verifyNoChange("namespace N1 { namespace N2 {\n"
+                 "}};",
+                 Style);
+
+  // Single namespace
+  verifyNoChange("namespace N {\n"
+                 "int f1(int a) { return 2 * a; }\n"
+                 "};",
+                 Style);
+
+  // Nested namespace
+  verifyNoChange("namespace N1 { namespace N2 { namespace N3 {\n"
+                 "int f1() {\n"
+                 "  int a = 1;\n"
+                 "  return a;\n"
+                 "}\n"
+                 "}}}",
+                 Style);
+}
+
+TEST_F(FormatTest, WrapNamespaceBodyWithEmptyLinesAlways) {
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owenca wrote:

Please make similar changes where applicable.

https://github.com/llvm/llvm-project/pull/106145