Add various readline related fixes

- Add missing unbind key
- Fix colored messages
- Add command completion
- Preserve last command input
- Fix cursor position issues
- Fix trailing whitespace in commands
- Synchronize set_prompt

contrib/epee/include/console_handler.h

@@ -374,6 +374,9 @@ namespace epee
           }
           else
           {
+#ifdef HAVE_READLINE
+            rdln::suspend_readline pause_readline;
+#endif
             std::cout << "unknown command: " << command << std::endl;
             std::cout << usage;
           }
@@ -477,6 +480,9 @@ namespace epee
       lookup::mapped_type & vt = m_command_handlers[cmd];
       vt.first = hndlr;
       vt.second = usage;
+#ifdef HAVE_READLINE
+      rdln::readline_buffer::add_completion(cmd);
+#endif
     }
 
     bool process_command_vec(const std::vector<std::string>& cmd)

contrib/epee/include/readline_buffer.h

@@ -3,6 +3,8 @@
 #include <streambuf>
 #include <sstream>
 #include <iostream>
+#include <vector>
+#include <algorithm>
 
 namespace rdln
 {
@@ -19,12 +21,23 @@ namespace rdln
     }
     void get_line(std::string& line) const;
     void set_prompt(const std::string& prompt);
+    static void add_completion(const std::string& command)
+    {
+      if(std::find(completion_commands.begin(), completion_commands.end(), command) != completion_commands.end())
+	return;
+      completion_commands.push_back(command);
+    }
+    static const std::vector<std::string>& get_completions()
+    {
+      return completion_commands;
+    }
     
   protected:
     virtual int sync();
     
   private:
     std::streambuf* m_cout_buf;
+    static std::vector<std::string> completion_commands;
   };
   
   class suspend_readline