[llvm-cov] Add a format option for the 'show' sub-command (mostly NFC)

llvm-svn: 273968
diff --git a/llvm/tools/llvm-cov/SourceCoverageView.cpp b/llvm/tools/llvm-cov/SourceCoverageView.cpp
index 0c2a887..3309189 100644
--- a/llvm/tools/llvm-cov/SourceCoverageView.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageView.cpp
@@ -50,8 +50,11 @@
 SourceCoverageView::create(StringRef SourceName, const MemoryBuffer &File,
                            const CoverageViewOptions &Options,
                            coverage::CoverageData &&CoverageInfo) {
-  return llvm::make_unique<SourceCoverageViewText>(SourceName, File, Options,
-                                                   std::move(CoverageInfo));
+  switch (Options.ShowFormat) {
+  case CoverageViewOptions::OutputFormat::Text:
+    return llvm::make_unique<SourceCoverageViewText>(SourceName, File, Options,
+                                                     std::move(CoverageInfo));
+  }
 }
 
 void SourceCoverageView::print(raw_ostream &OS, bool WholeFile,