CTest: Add --show-only[=format] option to print test info

format can be 'human' to print the current text format or 'json-v1' to
print the test object model in json format and is useful for IDEs who
want to gather information about the tests. Defaults to 'human' format.

1 files changed, 26 insertions, 0 deletions

diff --git a/Source/cmCTest.cxx b/Source/cmCTest.cxx
index 7c19864..225c99f 100644
--- a/Source/cmCTest.cxx
+++ b/Source/cmCTest.cxx
@@ -278,6 +278,8 @@ cmCTest::cmCTest()
   this->ExtraVerbose = false;
   this->ProduceXML = false;
   this->ShowOnly = false;
+  this->OutputAsJson = false;
+  this->OutputAsJsonVersion = 1;
   this->RunConfigurationScript = false;
   this->UseHTTP10 = false;
   this->PrintLabels = false;
@@ -1930,6 +1932,20 @@ bool cmCTest::HandleCommandLineArguments(size_t& i,
   if (this->CheckArgument(arg, "-N", "--show-only")) {
     this->ShowOnly = true;
   }
+  if (cmSystemTools::StringStartsWith(arg.c_str(), "--show-only=")) {
+    this->ShowOnly = true;
+
+    // Check if a specific format is requested. Defaults to human readable
+    // text.
+    std::string argWithFormat = "--show-only=";
+    std::string format = arg.substr(argWithFormat.length());
+    if (format == "json-v1") {
+      // Force quiet mode so the only output is the json object model.
+      this->Quiet = true;
+      this->OutputAsJson = true;
+      this->OutputAsJsonVersion = 1;
+    }
+  }
 
   if (this->CheckArgument(arg, "-O", "--output-log") && i < args.size() - 1) {
     i++;
@@ -2630,6 +2646,16 @@ bool cmCTest::GetShowOnly()
   return this->ShowOnly;
 }
 
+bool cmCTest::GetOutputAsJson()
+{
+  return this->OutputAsJson;
+}
+
+int cmCTest::GetOutputAsJsonVersion()
+{
+  return this->OutputAsJsonVersion;
+}
+
 int cmCTest::GetMaxTestNameWidth() const
 {
   return this->MaxTestNameWidth;