added a command line flag and associated code to support dumb terminals

lib/Interpreter/InvocationOptions.cpp

@@ -145,9 +145,11 @@ void CompilerOptions::Parse(int argc, const char* const argv[],
 }
 
 InvocationOptions::InvocationOptions(int argc, const char* const* argv) :
+
   MetaString("."), ErrorOut(false), NoLogo(false), ShowVersion(false),
   Help(false), NoRuntime(false) {
 
+
   ArrayRef<const char *> ArgStrings(argv, argv + argc);
   unsigned MissingArgIndex, MissingArgCount;
   std::unique_ptr<OptTable> Opts(CreateClingOptTable());

lib/UserInterface/UserInterface.cpp

@@ -98,6 +98,9 @@ namespace cling {
     UITabCompletion* Completion =
                       new UITabCompletion(m_MetaProcessor->getInterpreter());
     TI.SetCompletion(Completion);
+    if (D->GetTERM() &&  strstr(D->GetTERM(), "dumb")) {
+        TI.SetIsDumbTerm(true);
+    }
 
     std::string Line;
     std::string Prompt("[cling]$ ");

lib/UserInterface/textinput/TerminalDisplay.h

@@ -40,6 +40,8 @@ namespace textinput {
     void Detach();
     void DisplayInfo(const std::vector<std::string>& Options);
     bool IsTTY() const { return fIsTTY; }
+    void SetTERM(const char* TERM) { fTERM = TERM; };
+    const char* GetTERM() { return fTERM; };
 
   protected:
     TerminalDisplay(bool isTTY):
@@ -83,6 +85,7 @@ namespace textinput {
     size_t fWriteLen; // Length of output written.
     Pos fWritePos; // Current position of writing (temporarily != cursor)
     char fPrevColor; // currently configured color
+    const char* fTERM; // terminal type
   };
 }
 #endif // TEXTINPUT_TERMINALDISPLAY_H

lib/UserInterface/textinput/TerminalDisplayUnix.cpp

@@ -119,6 +119,7 @@ namespace textinput {
     TerminalConfigUnix::Get().TIOS()->c_lflag |= ECHOCTL|ECHOKE|ECHOE;
 #endif
     const char* TERM = getenv("TERM");
+    SetTERM(TERM);
     if (TERM &&  strstr(TERM, "256")) {
       fNColors = 256;
     }

lib/UserInterface/textinput/TerminalDisplayWin.cpp

@@ -23,6 +23,7 @@ namespace textinput {
   TerminalDisplayWin::TerminalDisplayWin():
     TerminalDisplay(false), fStartLine(0), fIsAttached(false),
     fDefaultAttributes(0), fOldCodePage(::GetConsoleOutputCP()) {
+    SetTerm("win");
     DWORD mode;
     SetIsTTY(::GetConsoleMode(::GetStdHandle(STD_INPUT_HANDLE), &mode) != 0);
 

lib/UserInterface/textinput/TextInput.cpp

@@ -31,6 +31,7 @@
 namespace textinput {
   TextInput::TextInput(Reader& reader, Display& display,
                        const char* HistFile /* = 0 */):
+  fIsDumbTerm(false),
   fMasked(false),
   fAutoHistAdd(true),
   fLastKey(0),
@@ -61,9 +62,11 @@ namespace textinput {
     }
     fContext->GetEditor()->ResetText();
 
-    // Signal displays that the input got taken.
-    std::for_each(fContext->GetDisplays().begin(), fContext->GetDisplays().end(),
-             std::mem_fun(&Display::NotifyResetInput));
+    if (!fIsDumbTerm) {
+        // Signal displays that the input got taken.
+        std::for_each(fContext->GetDisplays().begin(), fContext->GetDisplays().end(),
+                      std::mem_fun(&Display::NotifyResetInput));
+    }
 
     ReleaseInputOutput();
 
@@ -124,7 +127,9 @@ namespace textinput {
              || (*iR)->HaveBufferedInput()) {
         if ((*iR)->ReadInput(nRead, in)) {
           ProcessNewInput(in, R);
-          DisplayNewInput(R, OldCursorPos);
+          if (!IsDumbTerm()) {
+              DisplayNewInput(R, OldCursorPos);
+          }
           if (fLastReadResult == kRREOF
               || fLastReadResult == kRRReadEOLDelimiter)
             break;

lib/UserInterface/textinput/TextInput.h

@@ -88,6 +88,13 @@ namespace textinput {
     void EnableAutoHistAdd(bool enable = true) { fAutoHistAdd = enable; }
     void AddHistoryLine(const char* line);
 
+    // Dumb terminal getter and setter
+    bool IsDumbTerm() const {return fIsDumbTerm;}
+    void SetIsDumbTerm(bool isDumbTerm) { fIsDumbTerm = isDumbTerm; }
+
+  protected:
+    bool fIsDumbTerm; // whether this is a dumb terminal or not
+
   private:
     void EmitSignal(char c, EditorRange& r);
     void ProcessNewInput(const InputData& in, EditorRange& r);