Fixes a couple of bugs with the Allman brace breaking.

In particular, left braces after an enum declaration now occur on their
own line.  Further, when short ifs/whiles are allowed these no longer
cause the left brace to be on the same line as the if/while when a
brace is included.

Patch by Thomas Gibson-Robinson.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@187901 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -1710,6 +1710,9 @@ private:
                                       unsigned Limit) {
     if (Limit == 0)
       return;
+    if (Style.BreakBeforeBraces == FormatStyle::BS_Allman &&
+        (I + 1)->First->is(tok::l_brace))
+      return;
     if ((I + 1)->InPPDirective != I->InPPDirective ||
         ((I + 1)->InPPDirective && (I + 1)->First->HasUnescapedNewline))
       return;

lib/Format/UnwrappedLineParser.cpp

@@ -930,6 +930,8 @@ void UnwrappedLineParser::parseEnum() {
       nextToken();
   }
   if (FormatTok->Tok.is(tok::l_brace)) {
+    if (Style.BreakBeforeBraces == FormatStyle::BS_Allman)
+      addUnwrappedLine();
     nextToken();
     addUnwrappedLine();
     ++Line->Level;

unittests/Format/FormatTest.cpp

@@ -5530,6 +5530,37 @@ TEST_F(FormatTest, AllmanBraceBreaking) {
                "  }\n"
                "}\n",
                BreakBeforeBrace);
+
+  verifyFormat("enum X\n"
+               "{\n"
+               "  Y = 0,\n"
+               "}\n",
+               BreakBeforeBrace);
+
+  FormatStyle BreakBeforeBraceShortIfs = BreakBeforeBrace;
+  BreakBeforeBraceShortIfs.AllowShortIfStatementsOnASingleLine = true;
+  BreakBeforeBraceShortIfs.AllowShortLoopsOnASingleLine = true;
+  verifyFormat("void f(bool b)\n"
+               "{\n"
+               "  if (b)\n"
+               "  {\n"
+               "    return;\n"
+               "  }\n"
+               "}\n",
+               BreakBeforeBraceShortIfs);
+  verifyFormat("void f(bool b)\n"
+               "{\n"
+               "  if (b) return;\n"
+               "}\n",
+               BreakBeforeBraceShortIfs);
+  verifyFormat("void f(bool b)\n"
+               "{\n"
+               "  while (b)\n"
+               "  {\n"
+               "    return;\n"
+               "  }\n"
+               "}\n",
+               BreakBeforeBraceShortIfs);
 }
 
 TEST_F(FormatTest, UnderstandsPragmas) {