Added the concept of a Read-Eval-Print-Loop to LLDB.

A REPL takes over the command line and typically treats input as source code.
REPLs can also do code completion.  The REPL class allows its subclasses to
implement the language-specific functionality without having to know about the
IOHandler-specific internals.

Also added a PluginManager-based way of getting to a REPL given a language and
a target.

Also brought in some utility code and expression options that are useful for
REPLs, such as line offsets for expressions, ANSI terminal coloring of errors,
and a few IOHandler convenience functions.

llvm-svn: 250753

1 files changed, 14 insertions, 0 deletions

diff --git a/lldb/source/Host/common/File.cpp b/lldb/source/Host/common/File.cpp
index a3d7bf5940c..71a6149cd61 100644
--- a/lldb/source/Host/common/File.cpp
+++ b/lldb/source/Host/common/File.cpp
@@ -22,6 +22,8 @@
 #include <sys/ioctl.h>
 #endif
 
+#include "llvm/Support/Process.h" // for llvm::sys::Process::FileDescriptorHasColors()
+
 #include "lldb/Core/DataBufferHeap.h"
 #include "lldb/Core/Error.h"
 #include "lldb/Core/Log.h"
@@ -1051,7 +1053,11 @@ File::CalculateInteractiveAndTerminal ()
             if (::ioctl (fd, TIOCGWINSZ, &window_size) == 0)
             {
                 if (window_size.ws_col > 0)
+                {
                     m_is_real_terminal = eLazyBoolYes;
+                    if (llvm::sys::Process::FileDescriptorHasColors(fd))
+                        m_supports_colors = eLazyBoolYes;
+                }
             }
         }
 #endif
@@ -1074,3 +1080,11 @@ File::GetIsRealTerminal ()
     return m_is_real_terminal == eLazyBoolYes;
 }
 
+bool
+File::GetIsTerminalWithColors ()
+{
+    if (m_supports_colors == eLazyBoolCalculate)
+        CalculateInteractiveAndTerminal();
+    return m_supports_colors == eLazyBoolYes;
+}
+