added clearHistory command for PromptWidget (see #240)

docs/debugger.html

@@ -936,6 +936,7 @@ Type "help 'cmd'" to see extended information about the given command.</p>
             cheat - Use a cheat code (see manual for cheat types)
       clearBreaks - Clear all breakpoints
       clearConfig - Clear DiStella config directives [bank xx]
+     clearHistory - Clear the prompt history
 clearSaveStateIfs - Clear all saveState points
        clearTraps - Clear all traps
      clearWatches - Clear all watches

src/debugger/DebuggerParser.cxx

@@ -950,6 +950,14 @@ void DebuggerParser::executeClearConfig()
     commandResult << debugger.cartDebug().clearConfig();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+// "clearHistory"
+void DebuggerParser::executeClearHistory()
+{
+  debugger.prompt().clearHistory();
+  commandResult << "";
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 // "clearBreaks"
 void DebuggerParser::executeClearSaveStateIfs()
@@ -2600,6 +2608,16 @@ DebuggerParser::CommandArray DebuggerParser::commands = { {
     std::mem_fn(&DebuggerParser::executeClearConfig)
   },
 
+  {
+    "clearHistory",
+    "Clear the prompt history",
+    "Example: clearhisotry (no parameters)",
+    false,
+    true,
+    { Parameters::ARG_END_ARGS },
+    std::mem_fn(&DebuggerParser::executeClearHistory)
+  },
+
   {
     "clearSaveStateIfs",
     "Clear all saveState points",

src/debugger/DebuggerParser.hxx

@@ -101,7 +101,7 @@ class DebuggerParser
       std::array<Parameters, 10> parms;
       std::function<void (DebuggerParser*)> executor;
     };
-    using CommandArray = std::array<Command, 101>;
+    using CommandArray = std::array<Command, 102>;
     static CommandArray commands;
 
     struct Trap
@@ -159,6 +159,7 @@ class DebuggerParser
     void executeCheat();
     void executeClearBreaks();
     void executeClearConfig();
+    void executeClearHistory();
     void executeClearSaveStateIfs();
     void executeClearTraps();
     void executeClearWatches();

src/debugger/gui/PromptWidget.cxx

@@ -966,6 +966,13 @@ void PromptWidget::clearScreen()
   resetFunctions();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void PromptWidget::clearHistory()
+{
+  _history.clear();
+  _historyIndex = 0;
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void PromptWidget::resetFunctions()
 {

src/debugger/gui/PromptWidget.hxx

@@ -46,8 +46,10 @@ class PromptWidget : public Widget, public CommandSender
     void printPrompt();
     string saveBuffer(const FilesystemNode& file);
 
-    // Clear screen and erase all history
+    // Clear screen 
     void clearScreen();
+    // Erase all history
+    void clearHistory();
 
     void addToHistory(const char *str);