[clang] [clang-format] Add option AllowShortRecordOnASingleLine (PR #154580)

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=?utf-8?q?Tomáš?= Slanina <itzexpoexpo at gmail.com>,
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=?utf-8?q?Tomáš?= Slanina <itzexpoexpo at gmail.com>,
=?utf-8?q?Tomáš?= Slanina <itzexpoexpo at gmail.com>,
=?utf-8?q?Tomáš?= Slanina <itzexpoexpo at gmail.com>,
=?utf-8?q?Tomáš?= Slanina <itzexpoexpo at gmail.com>,
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/154580 at github.com>


================
@@ -485,20 +493,33 @@ class LineJoiner {
                  : 0;
     }
 
+    const bool TryMergeShortRecord = [this, &NextLine]() {
+      switch (Style.AllowShortRecordOnASingleLine) {
+      case FormatStyle::SRS_Never:
+        return false;
+      case FormatStyle::SRS_EmptyIfAttached:
+      case FormatStyle::SRS_Empty:
+        return NextLine.First->is(tok::r_brace);
+      case FormatStyle::SRS_Always:
+        return true;
+      }
+    }() && !Style.BraceWrapping.SplitEmptyRecord;
+
     if (TheLine->Last->is(tok::l_brace)) {
       bool ShouldMerge = false;
       // Try to merge records.
       if (TheLine->Last->is(TT_EnumLBrace)) {
         ShouldMerge = Style.AllowShortEnumsOnASingleLine;
       } else if (TheLine->Last->is(TT_CompoundRequirementLBrace)) {
         ShouldMerge = Style.AllowShortCompoundRequirementOnASingleLine;
-      } else if (TheLine->Last->isOneOf(TT_ClassLBrace, TT_StructLBrace)) {
-        // NOTE: We use AfterClass (whereas AfterStruct exists) for both classes
-        // and structs, but it seems that wrapping is still handled correctly
-        // elsewhere.
-        ShouldMerge = !Style.BraceWrapping.AfterClass ||
-                      (NextLine.First->is(tok::r_brace) &&
-                       !Style.BraceWrapping.SplitEmptyRecord);
+      } else if (TheLine->Last->isOneOf(TT_ClassLBrace, TT_StructLBrace,
+                                        TT_UnionLBrace)) {
+        if (Style.AllowShortRecordOnASingleLine > FormatStyle::SRS_Never) {
----------------
owenca wrote:

```suggestion
        if (Style.AllowShortRecordOnASingleLine != FormatStyle::SRS_Never) {
```

https://github.com/llvm/llvm-project/pull/154580