ENH: Create cmCTestVC::RunChild and parse helpers

This method will help VCS tool subclasses run child processes and log
the output while parsing it.

Source/CTest/cmCTestVC.cxx

@@ -18,6 +18,8 @@
 
 #include "cmCTest.h"
 
+#include <cmsys/Process.h>
+
 //----------------------------------------------------------------------------
 cmCTestVC::cmCTestVC(cmCTest* ct, std::ostream& log): CTest(ct), Log(log)
 {
@@ -39,3 +41,32 @@ void cmCTestVC::SetSourceDirectory(std::string const& dir)
 {
   this->SourceDirectory = dir;
 }
+
+//----------------------------------------------------------------------------
+bool cmCTestVC::RunChild(char const* const* cmd, OutputParser* out,
+                         OutputParser* err, const char* workDir)
+{
+  this->Log << this->ComputeCommandLine(cmd) << "\n";
+
+  cmsysProcess* cp = cmsysProcess_New();
+  cmsysProcess_SetCommand(cp, cmd);
+  workDir = workDir? workDir : this->SourceDirectory.c_str();
+  cmsysProcess_SetWorkingDirectory(cp, workDir);
+  this->RunProcess(cp, out, err);
+  int result = cmsysProcess_GetExitValue(cp);
+  cmsysProcess_Delete(cp);
+  return result == 0;
+}
+
+//----------------------------------------------------------------------------
+std::string cmCTestVC::ComputeCommandLine(char const* const* cmd)
+{
+  cmOStringStream line;
+  const char* sep = "";
+  for(const char* const* arg = cmd; *arg; ++arg)
+    {
+    line << sep << "\"" << *arg << "\"";
+    sep = " ";
+    }
+  return line.str();
+}

Source/CTest/cmCTestVC.h

@@ -17,7 +17,7 @@
 #ifndef cmCTestVC_h
 #define cmCTestVC_h
 
-#include "cmStandardIncludes.h"
+#include "cmProcessTools.h"
 
 class cmCTest;
 
@@ -25,7 +25,7 @@ class cmCTest;
  * \brief Base class for version control system handlers
  *
  */
-class cmCTestVC
+class cmCTestVC: public cmProcessTools
 {
 public:
   /** Construct with a CTest instance and update log stream.  */
@@ -41,6 +41,13 @@ public:
 
 protected:
 
+  /** Convert a list of arguments to a human-readable command line.  */
+  static std::string ComputeCommandLine(char const* const* cmd);
+
+  /** Run a command line and send output to given parsers.  */
+  bool RunChild(char const* const* cmd, OutputParser* out,
+                OutputParser* err, const char* workDir = 0);
+
   // Instance of cmCTest running the script.
   cmCTest* CTest;