ccmake: redirect stdout/stderr to the displayed logs

Use cmSystemTools to report some messages.
These should now be caught and displayed properly,
both in ccmake and cmake-gui

Avoid log display flickering during processing
- Don't clear the screen each time the long message form is rendered.
  It always renders the whole screen again so clearing it only causes
  flickering.
- Add scroll down capabilities to the long message form so that it can
  draw itself directly in the correct state. This removes the need to
  programatically scroll down just after that also caused flickering.

Fixes #19882
Fixes #13288

1 files changed, 3 insertions, 4 deletions

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index 4a6108d..b1c6e8f 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -330,9 +330,8 @@ bool cmake::SetCacheArgs(const std::vector<std::string>& args)
           }
         }
       } else {
-        std::cerr << "Parse error in command line argument: " << arg << "\n"
-                  << "Should be: VAR:type=value\n";
-        cmSystemTools::Error("No cmake script provided.");
+        cmSystemTools::Error("Parse error in command line argument: " + arg +
+                             "\n" + "Should be: VAR:type=value\n");
         return false;
       }
     } else if (cmHasLiteralPrefix(arg, "-W")) {
@@ -422,7 +421,7 @@ bool cmake::SetCacheArgs(const std::vector<std::string>& args)
           return false;
         }
       }
-      std::cout << "loading initial cache file " << path << "\n";
+      cmSystemTools::Stdout("loading initial cache file " + path + "\n");
       // Resolve script path specified on command line relative to $PWD.
       path = cmSystemTools::CollapseFullPath(path);
       this->ReadListFile(args, path);