From 3cf9d34deb5eb90bad99cd7baa0d391113c1b547 Mon Sep 17 00:00:00 2001
From: Christoph Sommer <mail@christoph-sommer.de>
Date: Wed, 26 Apr 2006 13:46:54 +0000
Subject: [PATCH] Added history functionality to Console

SVN-Revision: 3443
---
 src/console.cpp                            | 30 ++++++++++++++++++++++++++----
 src/console.hpp                            |  5 ++++-
 src/control/joystickkeyboardcontroller.cpp |  6 ++++++
 3 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/src/console.cpp b/src/console.cpp
index 1b5f01ea9..4cfa87412 100644
--- a/src/console.cpp
+++ b/src/console.cpp
@@ -34,9 +34,8 @@
 static const float FADE_SPEED = 1;
 
 Console::Console()
-  : vm(NULL), backgroundOffset(0), height(0), alpha(1.0), offset(0),
-    focused(false), stayOpen(0)
-{
+  : history_position(history.end()), vm(NULL), backgroundOffset(0), 
+    height(0), alpha(1.0), offset(0), focused(false), stayOpen(0) {
   fontheight = 8;
 }
 
@@ -158,6 +157,25 @@ Console::scroll(int numLines)
 }
 
 void
+Console::show_history(int offset)
+{
+  while ((offset > 0) && (history_position != history.end())) {
+    history_position++;
+    offset--;
+  }
+  while ((offset < 0) && (history_position != history.begin())) {
+    history_position--;
+    offset++;
+  }
+  if (history_position == history.end()) {
+    inputBuffer.str(std::string());
+  } else {
+    inputBuffer.str(*history_position);
+    inputBuffer.pubseekoff(0, std::ios_base::end, std::ios_base::out);
+  }
+}
+
+void
 Console::autocomplete()
 {
   std::string cmdPart = inputBuffer.str();
@@ -210,7 +228,11 @@ Console::parse(std::string s)
 {
   // make sure we actually have something to parse
   if (s.length() == 0) return;
-	
+
+  // add line to history
+  history.push_back(s);
+  history_position = history.end();
+
   // split line into list of args
   std::vector<std::string> args;
   size_t start = 0;
diff --git a/src/console.hpp b/src/console.hpp
index 1194a7fe4..a51f86aff 100644
--- a/src/console.hpp
+++ b/src/console.hpp
@@ -51,6 +51,7 @@ public:
   void backspace(); /**< delete last character sent to the input stream */
   void scroll(int offset); /**< scroll console text up or down by @c offset lines */
   void autocomplete(); /**< autocomplete current command */
+  void show_history(int offset); /**< move @c offset lines forward through history; Negative offset moves backward */
 
   void draw(DrawingContext& context); /**< draw the console in a DrawingContext */
   void update(float elapsed_time);
@@ -85,7 +86,9 @@ public:
   }
 
 private:
-  std::list<std::string> lines; /**< backbuffer of lines sent to the console */
+  std::list<std::string> history; /**< command history. New lines get added to back. */
+  std::list<std::string>::iterator history_position; /**< item of command history that is currently displayed */
+  std::list<std::string> lines; /**< backbuffer of lines sent to the console. New lines get added to front. */
   std::map<std::string, std::list<ConsoleCommandReceiver*> > commands; /**< map of console commands and a list of associated ConsoleCommandReceivers */
   
   std::auto_ptr<Surface> background; /**< console background image */
diff --git a/src/control/joystickkeyboardcontroller.cpp b/src/control/joystickkeyboardcontroller.cpp
index d31e5c43a..fcca5f51a 100644
--- a/src/control/joystickkeyboardcontroller.cpp
+++ b/src/control/joystickkeyboardcontroller.cpp
@@ -392,6 +392,12 @@ JoystickKeyboardController::process_console_key_event(const SDL_Event& event)
     case SDLK_END:
       Console::instance->scroll(+65535);
       break;
+    case SDLK_UP:
+      Console::instance->show_history(-1);
+      break;
+    case SDLK_DOWN:
+      Console::instance->show_history(+1);
+      break;
     default:
       int c = event.key.keysym.unicode;
       if ((c >= 32) && (c <= 126)) {
-- 
2.11.0