X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Ffg_commands.cxx;h=de4336833a344159e85801549e415fe0cf77dfca;hb=4fe615fff546df5e381f7fc9ddae92dd3dc36251;hp=cccaf0f7ce0b551bd046bae0ca57d3680fb38e8c;hpb=1b8f9cd1b4f5603ec0630869dc598bc0e34d3a95;p=flightgear.git

diff --git a/src/Main/fg_commands.cxx b/src/Main/fg_commands.cxx
index cccaf0f7c..de4336833 100644
--- a/src/Main/fg_commands.cxx
+++ b/src/Main/fg_commands.cxx
@@ -1,65 +1,329 @@
 // fg_commands.cxx - internal FGFS commands.
 
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <string.h>		// strcmp()
+
 #include <simgear/compiler.h>
 
 #include STL_STRING
 #include STL_FSTREAM
 
+#include <simgear/sg_inlines.h>
 #include <simgear/debug/logstream.hxx>
-#include <simgear/misc/commands.hxx>
-#include <simgear/misc/props.hxx>
+#include <simgear/math/sg_random.h>
+#include <simgear/structure/exception.hxx>
+#include <simgear/structure/commands.hxx>
+#include <simgear/props/props.hxx>
 
-#include <GUI/gui.h>
 #include <Cockpit/panel.hxx>
 #include <Cockpit/panel_io.hxx>
+#include <Cockpit/hud.hxx>
+#include <Environment/environment.hxx>
+#include <FDM/flight.hxx>
+#include <GUI/gui.h>
+#include <GUI/new_gui.hxx>
+#include <GUI/dialog.hxx>
+#include <Aircraft/replay.hxx>
 #include <Scenery/tilemgr.hxx>
+#include <Scenery/scenery.hxx>
+#if defined(HAVE_PLIB_PSL)
+#  include <Scripting/scriptmgr.hxx>
+#endif
+#include <Scripting/NasalSys.hxx>
+#include <Sound/fg_fx.hxx>
+#include <Time/sunsolver.hxx>
 #include <Time/tmp.hxx>
 
+#include "fg_init.hxx"
+#include "fg_io.hxx"
 #include "fg_commands.hxx"
+#include "fg_props.hxx"
+#include "globals.hxx"
+#include "logger.hxx"
+#include "util.hxx"
+#include "viewmgr.hxx"
+#include "main.hxx"
 
 SG_USING_STD(string);
-#if !defined(SG_HAVE_NATIVE_SGI_COMPILERS)
 SG_USING_STD(ifstream);
 SG_USING_STD(ofstream);
-#endif
 
-#include "fg_props.hxx"
-#include "fg_io.hxx"
-#include "globals.hxx"
+
+
+////////////////////////////////////////////////////////////////////////
+// Static helper functions.
+////////////////////////////////////////////////////////////////////////
+
+
+static inline SGPropertyNode *
+get_prop (const SGPropertyNode * arg)
+{
+    return fgGetNode(arg->getStringValue("property[0]", "/null"), true);
+}
+
+static inline SGPropertyNode *
+get_prop2 (const SGPropertyNode * arg)
+{
+    return fgGetNode(arg->getStringValue("property[1]", "/null"), true);
+}
+
+
+/**
+ * Get a double value and split it as required.
+ */
+static void
+split_value (double full_value, const char * mask,
+             double * unmodifiable, double * modifiable)
+{
+    if (!strcmp("integer", mask)) {
+        *modifiable = (full_value < 0 ? ceil(full_value) : floor (full_value));
+        *unmodifiable = full_value - *modifiable;
+    } else if (!strcmp("decimal", mask)) {
+        *unmodifiable = (full_value < 0 ? ceil(full_value) : floor(full_value));
+        *modifiable = full_value - *unmodifiable;
+    } else {
+        if (strcmp("all", mask))
+            SG_LOG(SG_GENERAL, SG_ALERT, "Bad value " << mask << " for mask;"
+                   << " assuming 'all'");
+        *unmodifiable = 0;
+        *modifiable = full_value;
+    }
+}
+
+
+/**
+ * Clamp or wrap a value as specified.
+ */
+static void
+limit_value (double * value, const SGPropertyNode * arg)
+{
+    const SGPropertyNode * min_node = arg->getChild("min");
+    const SGPropertyNode * max_node = arg->getChild("max");
+
+    bool wrap = arg->getBoolValue("wrap");
+
+    if (min_node == 0 || max_node == 0)
+        wrap = false;
+  
+    if (wrap) {                 // wrap such that min <= x < max
+        double min_val = min_node->getDoubleValue();
+        double max_val = max_node->getDoubleValue();
+        double resolution = arg->getDoubleValue("resolution");
+        if (resolution > 0.0) {
+            // snap to (min + N*resolution), taking special care to handle imprecision
+            int n = (int)floor((*value - min_val) / resolution + 0.5);
+            int steps = (int)floor((max_val - min_val) / resolution + 0.5);
+            SG_NORMALIZE_RANGE(n, 0, steps);
+            *value = min_val + resolution * n;
+        } else {
+            // plain circular wrapping
+            SG_NORMALIZE_RANGE(*value, min_val, max_val);
+        }
+    } else {                    // clamp such that min <= x <= max
+        if ((min_node != 0) && (*value < min_node->getDoubleValue()))
+            *value = min_node->getDoubleValue();
+        else if ((max_node != 0) && (*value > max_node->getDoubleValue()))
+            *value = max_node->getDoubleValue();
+    }
+}
+
+static bool
+compare_values (SGPropertyNode * value1, SGPropertyNode * value2)
+{
+    switch (value1->getType()) {
+    case SGPropertyNode::BOOL:
+        return (value1->getBoolValue() == value2->getBoolValue());
+    case SGPropertyNode::INT:
+        return (value1->getIntValue() == value2->getIntValue());
+    case SGPropertyNode::LONG:
+        return (value1->getLongValue() == value2->getLongValue());
+    case SGPropertyNode::FLOAT:
+        return (value1->getFloatValue() == value2->getFloatValue());
+    case SGPropertyNode::DOUBLE:
+        return (value1->getDoubleValue() == value2->getDoubleValue());
+    default:
+        return !strcmp(value1->getStringValue(), value2->getStringValue());
+    }
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+// Command implementations.
+////////////////////////////////////////////////////////////////////////
 
 
 /**
  * Built-in command: do nothing.
  */
 static bool
-do_null (const SGPropertyNode * arg, SGCommandState ** state)
+do_null (const SGPropertyNode * arg)
 {
   return true;
 }
 
+#if defined(HAVE_PLIB_PSL)
+/**
+ * Built-in command: run a PSL script.
+ *
+ * script: the PSL script to execute
+ */
+static bool
+do_script (const SGPropertyNode * arg)
+{
+    FGScriptMgr * mgr = (FGScriptMgr *)globals->get_subsystem("scripting");
+    return mgr->run(arg->getStringValue("script"));
+}
+#endif // HAVE_PLIB_PSL
+
+/**
+ * Built-in command: run a Nasal script.
+ */
+static bool
+do_nasal (const SGPropertyNode * arg)
+{
+    return ((FGNasalSys*)globals->get_subsystem("nasal"))->handleCommand(arg);
+}
 
 /**
  * Built-in command: exit FlightGear.
  *
- * TODO: show a confirm dialog.
+ * status: the exit status to return to the operating system (defaults to 0)
  */
 static bool
-do_exit (const SGPropertyNode * arg, SGCommandState ** state)
+do_exit (const SGPropertyNode * arg)
 {
-  SG_LOG(SG_INPUT, SG_ALERT, "Program exit requested.");
-  ConfirmExitDialog();
-  return true;
+    SG_LOG(SG_INPUT, SG_INFO, "Program exit requested.");
+    fgSetBool("/sim/signals/exit", true);
+
+    if (fgGetBool("/sim/startup/save-on-exit")) {
+#ifdef _MSC_VER
+        char* envp = ::getenv( "APPDATA" );
+        if ( envp != NULL ) {
+            SGPath config( envp );
+            config.append( "flightgear.org" );
+#else
+        if ( homedir != NULL ) {
+            SGPath config( homedir );
+            config.append( ".fgfs" );
+#endif
+            config.append( "autosave.xml" );
+            config.create_dir( 0700 );
+            SG_LOG(SG_IO, SG_INFO, "Saving user settings to " << config.str());
+            try {
+                writeProperties(config.str(), globals->get_props(), false, SGPropertyNode::USERARCHIVE);
+            } catch (const sg_exception &e) {
+                guiErrorMessage("Error writing autosave.xml: ", e);
+            }
+
+            SG_LOG(SG_INPUT, SG_DEBUG, "Finished Saving user settings");
+        }
+    }
+    fgExit(arg->getIntValue("status", 0));
+    return true;
+}
+
+
+/**
+ * Built-in command: reinitialize one or more subsystems.
+ *
+ * subsystem[*]: the name(s) of the subsystem(s) to reinitialize; if
+ * none is specified, reinitialize all of them.
+ */
+static bool
+do_reinit (const SGPropertyNode * arg)
+{
+    bool result = true;
+
+    vector<SGPropertyNode_ptr> subsystems = arg->getChildren("subsystem");
+    if (subsystems.size() == 0) {
+        globals->get_subsystem_mgr()->reinit();
+    } else {
+        for ( unsigned int i = 0; i < subsystems.size(); i++ ) {
+            const char * name = subsystems[i]->getStringValue();
+            SGSubsystem * subsystem = globals->get_subsystem(name);
+            if (subsystem == 0) {
+                result = false;
+                SG_LOG( SG_GENERAL, SG_ALERT,
+                        "Subsystem " << name << "not found" );
+            } else {
+                subsystem->reinit();
+            }
+        }
+    }
+
+    globals->get_event_mgr()->reinit();
+
+    return result;
+}
+
+#if 0
+  //
+  // these routines look useful ??? but are never used in the code ???
+  //
+
+/**
+ * Built-in command: suspend one or more subsystems.
+ *
+ * subsystem[*] - the name(s) of the subsystem(s) to suspend.
+ */
+static bool
+do_suspend (const SGPropertyNode * arg)
+{
+    bool result = true;
+
+    vector<SGPropertyNode_ptr> subsystems = arg->getChildren("subsystem");
+    for ( unsigned int i = 0; i < subsystems.size(); i++ ) {
+        const char * name = subsystems[i]->getStringValue();
+        SGSubsystem * subsystem = globals->get_subsystem(name);
+        if (subsystem == 0) {
+            result = false;
+            SG_LOG(SG_GENERAL, SG_ALERT, "Subsystem " << name << "not found");
+        } else {
+            subsystem->suspend();
+        }
+    }
+    return result;
 }
 
+/**
+ * Built-in command: suspend one or more subsystems.
+ *
+ * subsystem[*] - the name(s) of the subsystem(s) to suspend.
+ */
+static bool
+do_resume (const SGPropertyNode * arg)
+{
+    bool result = true;
+
+    vector<SGPropertyNode_ptr> subsystems = arg->getChildren("subsystem");
+    for ( unsigned int i = 0; i < subsystems.size(); i++ ) {
+        const char * name = subsystems[i]->getStringValue();
+        SGSubsystem * subsystem = globals->get_subsystem(name);
+        if (subsystem == 0) {
+            result = false;
+            SG_LOG(SG_GENERAL, SG_ALERT, "Subsystem " << name << "not found");
+        } else {
+            subsystem->resume();
+        }
+    }
+    return result;
+}
+
+#endif
+
 
 /**
  * Built-in command: load flight.
  *
  * file (optional): the name of the file to load (relative to current
- * directory).  Defaults to "fgfs.sav".
+ *   directory).  Defaults to "fgfs.sav"
  */
 static bool
-do_load (const SGPropertyNode * arg, SGCommandState ** state)
+do_load (const SGPropertyNode * arg)
 {
   const string &file = arg->getStringValue("file", "fgfs.sav");
   ifstream input(file.c_str());
@@ -68,7 +332,7 @@ do_load (const SGPropertyNode * arg, SGCommandState ** state)
     SG_LOG(SG_INPUT, SG_INFO, "Restored flight from " << file);
     return true;
   } else {
-    SG_LOG(SG_INPUT, SG_ALERT, "Cannot load flight from " << file);
+    SG_LOG(SG_INPUT, SG_WARN, "Cannot load flight from " << file);
     return false;
   }
 }
@@ -81,12 +345,13 @@ do_load (const SGPropertyNode * arg, SGCommandState ** state)
  * current directory).  Defaults to "fgfs.sav".
  */
 static bool
-do_save (const SGPropertyNode * arg, SGCommandState ** state)
+do_save (const SGPropertyNode * arg)
 {
   const string &file = arg->getStringValue("file", "fgfs.sav");
+  bool write_all = arg->getBoolValue("write-all", false);
   SG_LOG(SG_INPUT, SG_INFO, "Saving flight");
   ofstream output(file.c_str());
-  if (output.good() && fgSaveFlight(output)) {
+  if (output.good() && fgSaveFlight(output, write_all)) {
     output.close();
     SG_LOG(SG_INPUT, SG_INFO, "Saved flight to " << file);
     return true;
@@ -105,7 +370,7 @@ do_save (const SGPropertyNode * arg, SGCommandState ** state)
  * and if that's unspecified, to "Panels/Default/default.xml".
  */
 static bool
-do_panel_load (const SGPropertyNode * arg, SGCommandState ** state)
+do_panel_load (const SGPropertyNode * arg)
 {
   string panel_path =
     arg->getStringValue("path",
@@ -118,14 +383,36 @@ do_panel_load (const SGPropertyNode * arg, SGCommandState ** state)
     return false;
   }
   SG_LOG(SG_INPUT, SG_INFO, "Loaded new panel from " << panel_path);
-  current_panel->unbind();
-  delete current_panel;
-  current_panel = new_panel;
-  current_panel->bind();
+  globals->get_current_panel()->unbind();
+  delete globals->get_current_panel();
+  globals->set_current_panel( new_panel );
+  globals->get_current_panel()->bind();
   return true;
 }
 
 
+/**
+ * Built-in command: pass a mouse click to the panel.
+ *
+ * button: the mouse button number, zero-based.
+ * is-down: true if the button is down, false if it is up.
+ * x-pos: the x position of the mouse click.
+ * y-pos: the y position of the mouse click.
+ */
+static bool
+do_panel_mouse_click (const SGPropertyNode * arg)
+{
+  if (globals->get_current_panel() != 0)
+    return globals->get_current_panel()
+      ->doMouseAction(arg->getIntValue("button"),
+		      arg->getBoolValue("is-down") ? PU_DOWN : PU_UP,
+		      arg->getIntValue("x-pos"),
+		      arg->getIntValue("y-pos"));
+  else
+    return false;
+}
+
+
 /**
  * Built-in command: (re)load preferences.
  *
@@ -133,41 +420,67 @@ do_panel_load (const SGPropertyNode * arg, SGCommandState ** state)
  * to FG_ROOT). Defaults to "preferences.xml".
  */
 static bool
-do_preferences_load (const SGPropertyNode * arg, SGCommandState ** state)
+do_preferences_load (const SGPropertyNode * arg)
 {
-  const string &path = arg->getStringValue("path", "preferences.xml");
-  SGPath props_path(globals->get_fg_root());
-  props_path.append(path);
-  SG_LOG(SG_INPUT, SG_INFO, "Reading global preferences from "
-	 << props_path.str());
-  if (!readProperties(props_path.str(), globals->get_props())) {
-    SG_LOG(SG_INPUT, SG_ALERT, "Failed to reread global preferences");
+  try {
+    fgLoadProps(arg->getStringValue("path", "preferences.xml"),
+                globals->get_props());
+  } catch (const sg_exception &e) {
+    guiErrorMessage("Error reading global preferences: ", e);
     return false;
-  } else {
-    SG_LOG(SG_INPUT, SG_INFO, "Successfully read global preferences.");
-    return true;
   }
+  SG_LOG(SG_INPUT, SG_INFO, "Successfully read global preferences.");
+  return true;
 }
 
 
+static void
+fix_hud_visibility()
+{
+  if ( !strcmp(fgGetString("/sim/flight-model"), "ada") ) {
+      globals->get_props()->setBoolValue( "/sim/hud/visibility", true );
+      if ( globals->get_viewmgr()->get_current() == 1 ) {
+          globals->get_props()->setBoolValue( "/sim/hud/visibility", false );
+      }
+  }
+}
+
+static void
+do_view_next( bool )
+{
+    globals->get_current_view()->setHeadingOffset_deg(0.0);
+    globals->get_viewmgr()->next_view();
+    fix_hud_visibility();
+    globals->get_tile_mgr()->refresh_view_timestamps();
+}
+
+static void
+do_view_prev( bool )
+{
+    globals->get_current_view()->setHeadingOffset_deg(0.0);
+    globals->get_viewmgr()->prev_view();
+    fix_hud_visibility();
+    globals->get_tile_mgr()->refresh_view_timestamps();
+}
+
 /**
  * Built-in command: cycle view.
  */
 static bool
-do_view_cycle (const SGPropertyNode * arg, SGCommandState ** state)
+do_view_cycle (const SGPropertyNode * arg)
 {
-  globals->get_current_view()->set_view_offset(0.0);
-  globals->set_current_view(globals->get_viewmgr()->next_view());
-//   fgReshape(fgGetInt("/sim/startup/xsize"), fgGetInt("/sim/startup/ysize"));
+  globals->get_current_view()->setHeadingOffset_deg(0.0);
+  globals->get_viewmgr()->next_view();
+  fix_hud_visibility();
+  globals->get_tile_mgr()->refresh_view_timestamps();
   return true;
 }
 
-
 /**
  * Built-in command: capture screen.
  */
 static bool
-do_screen_capture (const SGPropertyNode * arg, SGCommandState ** state)
+do_screen_capture (const SGPropertyNode * arg)
 {
   fgDumpSnapShot();
   return true;
@@ -175,209 +488,420 @@ do_screen_capture (const SGPropertyNode * arg, SGCommandState ** state)
 
 
 /**
- * Reload the tile cache.
+ * Built-in command: hires capture screen.
  */
 static bool
-do_tile_cache_reload (const SGPropertyNode * arg, SGCommandState ** state)
+do_hires_screen_capture (const SGPropertyNode * arg)
 {
-  bool freeze = globals->get_freeze();
-  SG_LOG(SG_INPUT, SG_INFO, "ReIniting TileCache");
-  if ( !freeze ) 
-    globals->set_freeze( true );
-  BusyCursor(0);
-  if ( global_tile_mgr.init() ) {
-    // Load the local scenery data
-    global_tile_mgr.update(fgGetDouble("/position/longitude"),
-			   fgGetDouble("/position/latitude"));
-  } else {
-    SG_LOG( SG_GENERAL, SG_ALERT, 
-	    "Error in Tile Manager initialization!" );
-    exit(-1);
-  }
-  BusyCursor(1);
-  if ( !freeze )
-    globals->set_freeze( false );
+  fgHiResDump();
   return true;
 }
 
 
 /**
- * Update the lighting manually.
+ * Reload the tile cache.
  */
 static bool
-do_lighting_update (const SGPropertyNode * arg, SGCommandState ** state)
+do_tile_cache_reload (const SGPropertyNode * arg)
 {
-  fgUpdateSkyAndLightingParams();
-  return true;
+    static const SGPropertyNode *master_freeze
+	= fgGetNode("/sim/freeze/master");
+    bool freeze = master_freeze->getBoolValue();
+    SG_LOG(SG_INPUT, SG_INFO, "ReIniting TileCache");
+    if ( !freeze ) {
+	fgSetBool("/sim/freeze/master", true);
+    }
+    if ( globals->get_tile_mgr()->init() ) {
+	// Load the local scenery data
+        double visibility_meters = fgGetDouble("/environment/visibility-m");
+	globals->get_tile_mgr()->update( visibility_meters );
+    } else {
+	SG_LOG( SG_GENERAL, SG_ALERT, 
+		"Error in Tile Manager initialization!" );
+	exit(-1);
+    }
+    if ( !freeze ) {
+	fgSetBool("/sim/freeze/master", false);
+    }
+    return true;
 }
 
 
 /**
- * Built-in command: toggle a bool property value.
- *
- * property: The name of the property to toggle.
+ * Set the sea level outside air temperature and assigning that to all
+ * boundary and aloft environment layers.
  */
 static bool
-do_property_toggle (const SGPropertyNode * arg, SGCommandState ** state)
+do_set_sea_level_degc (const SGPropertyNode * arg)
 {
-  const string & propname = arg->getStringValue("property", "");
-  if (propname == "")
-    return false;
+    double temp_sea_level_degc = arg->getDoubleValue("temp-degc", 15.0);
+
+    SGPropertyNode *node, *child;
 
-  SGPropertyNode * node = fgGetNode(propname);
-  return node->setBoolValue(!node->getBoolValue());
+    // boundary layers
+    node = fgGetNode( "/environment/config/boundary" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "temperature-sea-level-degc",
+			       temp_sea_level_degc );
+	++i;
+      }
+    }
+
+    // aloft layers
+    node = fgGetNode( "/environment/config/aloft" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "temperature-sea-level-degc",
+			       temp_sea_level_degc );
+	++i;
+      }
+    }
+
+    return true;
 }
 
 
 /**
- * Built-in command: assign a value to a property.
- *
- * property: the name of the property to assign.
- * value: the value to assign.
+ * Set the outside air temperature at the "current" altitude by first
+ * calculating the corresponding sea level temp, and assigning that to
+ * all boundary and aloft environment layers.
  */
 static bool
-do_property_assign (const SGPropertyNode * arg, SGCommandState ** state)
+do_set_oat_degc (const SGPropertyNode * arg)
 {
-  const string & propname = arg->getStringValue("property", "");
-  if (propname == "")
-    return false;
+    const string &temp_str = arg->getStringValue("temp-degc", "15.0");
 
-  SGPropertyNode * node = fgGetNode(propname, true);
-
-  switch (node->getType()) {
-  case SGPropertyNode::BOOL:
-    return node->setBoolValue(arg->getBoolValue("value"));
-  case SGPropertyNode::INT:
-    return node->setIntValue(arg->getIntValue("value"));
-  case SGPropertyNode::LONG:
-    return node->setLongValue(arg->getLongValue("value"));
-  case SGPropertyNode::FLOAT:
-    return node->setFloatValue(arg->getFloatValue("value"));
-  case SGPropertyNode::DOUBLE:
-    return node->setDoubleValue(arg->getDoubleValue("value"));
-  case SGPropertyNode::STRING:
-    return node->setStringValue(arg->getStringValue("value"));
-  default:
-    return node->setUnspecifiedValue(arg->getStringValue("value"));
-  }
+    // check for an altitude specified in the arguments, otherwise use
+    // current aircraft altitude.
+    const SGPropertyNode *altitude_ft = arg->getChild("altitude-ft");
+    if ( altitude_ft == NULL ) {
+        altitude_ft = fgGetNode("/position/altitude-ft");
+    }
+
+    FGEnvironment dummy;	// instantiate a dummy so we can leech a method
+    dummy.set_elevation_ft( altitude_ft->getDoubleValue() );
+    dummy.set_temperature_degc( atof( temp_str.c_str() ) );
+    double temp_sea_level_degc = dummy.get_temperature_sea_level_degc();
+
+    //cout << "Altitude = " << altitude_ft->getDoubleValue() << endl;
+    //cout << "Temp at alt (C) = " << atof( temp_str.c_str() ) << endl;
+    //cout << "Temp sea level (C) = " << temp_sea_level_degc << endl;
+ 
+    SGPropertyNode *node, *child;
+
+    // boundary layers
+    node = fgGetNode( "/environment/config/boundary" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "temperature-sea-level-degc",
+			       temp_sea_level_degc );
+	++i;
+      }
+    }
+
+    // aloft layers
+    node = fgGetNode( "/environment/config/aloft" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "temperature-sea-level-degc",
+			       temp_sea_level_degc );
+	++i;
+      }
+    }
+
+    return true;
+}
+
+/**
+ * Set the sea level outside air dewpoint and assigning that to all
+ * boundary and aloft environment layers.
+ */
+static bool
+do_set_dewpoint_sea_level_degc (const SGPropertyNode * arg)
+{
+    double dewpoint_sea_level_degc = arg->getDoubleValue("dewpoint-degc", 5.0);
+
+    SGPropertyNode *node, *child;
+
+    // boundary layers
+    node = fgGetNode( "/environment/config/boundary" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "dewpoint-sea-level-degc",
+			       dewpoint_sea_level_degc );
+	++i;
+      }
+    }
+
+    // aloft layers
+    node = fgGetNode( "/environment/config/aloft" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "dewpoint-sea-level-degc",
+			       dewpoint_sea_level_degc );
+	++i;
+      }
+    }
+
+    return true;
 }
 
 
 /**
- * Built-in command: increment or decrement a property value.
+ * Set the outside air dewpoint at the "current" altitude by first
+ * calculating the corresponding sea level dewpoint, and assigning
+ * that to all boundary and aloft environment layers.
+ */
+static bool
+do_set_dewpoint_degc (const SGPropertyNode * arg)
+{
+    const string &dewpoint_str = arg->getStringValue("dewpoint-degc", "5.0");
+
+    // check for an altitude specified in the arguments, otherwise use
+    // current aircraft altitude.
+    const SGPropertyNode *altitude_ft = arg->getChild("altitude-ft");
+    if ( altitude_ft == NULL ) {
+        altitude_ft = fgGetNode("/position/altitude-ft");
+    }
+
+    FGEnvironment dummy;	// instantiate a dummy so we can leech a method
+    dummy.set_elevation_ft( altitude_ft->getDoubleValue() );
+    dummy.set_dewpoint_degc( atof( dewpoint_str.c_str() ) );
+    double dewpoint_sea_level_degc = dummy.get_dewpoint_sea_level_degc();
+
+    //cout << "Altitude = " << altitude_ft->getDoubleValue() << endl;
+    //cout << "Dewpoint at alt (C) = " << atof( dewpoint_str.c_str() ) << endl;
+    //cout << "Dewpoint at sea level (C) = " << dewpoint_sea_level_degc << endl;
+ 
+    SGPropertyNode *node, *child;
+
+    // boundary layers
+    node = fgGetNode( "/environment/config/boundary" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "dewpoint-sea-level-degc",
+			       dewpoint_sea_level_degc );
+	++i;
+      }
+    }
+
+    // aloft layers
+    node = fgGetNode( "/environment/config/aloft" );
+    if ( node != NULL ) {
+      int i = 0;
+      while ( ( child = node->getNode( "entry", i ) ) != NULL ) {
+	child->setDoubleValue( "dewpoint-sea-level-degc",
+			       dewpoint_sea_level_degc );
+	++i;
+      }
+    }
+
+    return true;
+}
+
+/**
+ * Update the lighting manually.
+ */
+static bool
+do_timeofday (const SGPropertyNode * arg)
+{
+    const string &offset_type = arg->getStringValue("timeofday", "noon");
+
+    static const SGPropertyNode *longitude
+        = fgGetNode("/position/longitude-deg");
+    static const SGPropertyNode *latitude
+        = fgGetNode("/position/latitude-deg");
+    static const SGPropertyNode *cur_time_override
+        = fgGetNode("/sim/time/cur-time-override", true);
+
+    int orig_warp = globals->get_warp();
+    SGTime *t = globals->get_time_params();
+    time_t cur_time = t->get_cur_time();
+    // cout << "cur_time = " << cur_time << endl;
+    // cout << "orig_warp = " << orig_warp << endl;
+
+    int warp = 0;
+    if ( offset_type == "real" ) {
+        warp = -orig_warp;
+    } else if ( offset_type == "dawn" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           90.0, true ); 
+    } else if ( offset_type == "morning" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           75.0, true ); 
+    } else if ( offset_type == "noon" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           0.0, true ); 
+    } else if ( offset_type == "afternoon" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           60.0, false ); 
+     } else if ( offset_type == "dusk" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           90.0, false ); 
+     } else if ( offset_type == "evening" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           100.0, false ); 
+    } else if ( offset_type == "midnight" ) {
+        warp = fgTimeSecondsUntilSunAngle( cur_time,
+                                           longitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           latitude->getDoubleValue()
+                                             * SGD_DEGREES_TO_RADIANS,
+                                           180.0, false ); 
+    }
+    // cout << "warp = " << warp << endl;
+    globals->set_warp( orig_warp + warp );
+
+    t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
+               latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
+               cur_time_override->getLongValue(),
+               globals->get_warp() );
+
+    return true;
+}
+
+
+/**
+ * Built-in command: toggle a bool property value.
  *
- * property: the name of the property to increment or decrement.
- * step: the amount of the increment or decrement.
+ * property: The name of the property to toggle.
  */
 static bool
-do_property_adjust (const SGPropertyNode * arg, SGCommandState ** state)
+do_property_toggle (const SGPropertyNode * arg)
 {
-  const string & propname = arg->getStringValue("property", "");
-  if (propname == "")
-    return false;
+  SGPropertyNode * prop = get_prop(arg);
+  return prop->setBoolValue(!prop->getBoolValue());
+}
 
-  SGPropertyNode * node = fgGetNode(propname, true);
 
-  switch (node->getType()) {
-  case SGPropertyNode::BOOL:
-    if (arg->getBoolValue("step"))
-      return node->setBoolValue(!node->getBoolValue());
-    else
-      return true;
-  case SGPropertyNode::INT:
-    return node->setIntValue(node->getIntValue()
-			     + arg->getIntValue("step"));
-  case SGPropertyNode::LONG:
-    return node->setLongValue(node->getLongValue()
-			      + arg->getLongValue("step"));
-  case SGPropertyNode::FLOAT:
-    return node->setFloatValue(node->getFloatValue()
-			       + arg->getFloatValue("step"));
-  case SGPropertyNode::DOUBLE:
-  case SGPropertyNode::UNSPECIFIED:
-    return node->setDoubleValue(node->getDoubleValue()
-				+ arg->getDoubleValue("step"));
-  default:			// doesn't make sense with strings
-    return false;
-  }
+/**
+ * Built-in command: assign a value to a property.
+ *
+ * property: the name of the property to assign.
+ * value: the value to assign; or
+ * property[1]: the property to copy from.
+ */
+static bool
+do_property_assign (const SGPropertyNode * arg)
+{
+  SGPropertyNode * prop = get_prop(arg);
+  const SGPropertyNode * prop2 = get_prop2(arg);
+  const SGPropertyNode * value = arg->getNode("value");
+
+  if (value != 0)
+      return prop->setUnspecifiedValue(value->getStringValue());
+  else if (prop2)
+      return prop->setUnspecifiedValue(prop2->getStringValue());
+  else
+      return false;
 }
 
 
 /**
-<<<<<<< fg_commands.cxx
- * Built-in command: multiply a property value.
+ * Built-in command: increment or decrement a property value.
  *
- * property: the name of the property to multiply.
- * factor: the amount by which to multiply.
+ * If the 'step' argument is present, it will be used; otherwise,
+ * the command uses 'offset' and 'factor', usually from the mouse.
+ *
+ * property: the name of the property to increment or decrement.
+ * step: the amount of the increment or decrement (default: 0).
+ * offset: offset from the current setting (used for the mouse; multiplied 
+ *         by factor)
+ * factor: scaling amount for the offset (defaults to 1).
+ * min: the minimum allowed value (default: no minimum).
+ * max: the maximum allowed value (default: no maximum).
+ * mask: 'integer' to apply only to the left of the decimal point, 
+ *       'decimal' to apply only to the right of the decimal point,
+ *       or 'all' to apply to the whole number (the default).
+ * wrap: true if the value should be wrapped when it passes min or max;
+ *       both min and max must be present for this to work (default:
+ *       false).
  */
 static bool
-do_property_multiply (const SGPropertyNode * arg, SGCommandState ** state)
+do_property_adjust (const SGPropertyNode * arg)
 {
-  const string & propname = arg->getStringValue("property", "");
-  if (propname == "")
-    return false;
+  SGPropertyNode * prop = get_prop(arg);
 
-  SGPropertyNode * node = fgGetNode(propname, true);
-
-  switch (node->getType()) {
-  case SGPropertyNode::BOOL:
-    return node->setBoolValue(node->getBoolValue() &&
-			      arg->getBoolValue("factor"));
-  case SGPropertyNode::INT:
-    return node->setIntValue(int(node->getIntValue()
-				 * arg->getDoubleValue("factor")));
-  case SGPropertyNode::LONG:
-    return node->setLongValue(long(node->getLongValue()
-				   * arg->getDoubleValue("factor")));
-  case SGPropertyNode::FLOAT:
-    return node->setFloatValue(float(node->getFloatValue()
-				     * arg->getDoubleValue("factor")));
-  case SGPropertyNode::DOUBLE:
-  case SGPropertyNode::UNSPECIFIED:
-    return node->setDoubleValue(node->getDoubleValue()
-				* arg->getDoubleValue("factor"));
-  default:			// doesn't make sense with strings
-    return false;
-  }
+  double amount = 0;
+  if (arg->hasValue("step"))
+      amount = arg->getDoubleValue("step");
+  else
+      amount = (arg->getDoubleValue("factor", 1)
+                * arg->getDoubleValue("offset"));
+          
+  double unmodifiable, modifiable;
+  split_value(prop->getDoubleValue(), arg->getStringValue("mask", "all"),
+              &unmodifiable, &modifiable);
+  modifiable += amount;
+  limit_value(&modifiable, arg);
+
+  prop->setDoubleValue(unmodifiable + modifiable);
+
+  return true;
 }
 
 
 /**
-=======
  * Built-in command: multiply a property value.
  *
  * property: the name of the property to multiply.
  * factor: the amount by which to multiply.
+ * min: the minimum allowed value (default: no minimum).
+ * max: the maximum allowed value (default: no maximum).
+ * mask: 'integer' to apply only to the left of the decimal point, 
+ *       'decimal' to apply only to the right of the decimal point,
+ *       or 'all' to apply to the whole number (the default).
+ * wrap: true if the value should be wrapped when it passes min or max;
+ *       both min and max must be present for this to work (default:
+ *       false).
  */
 static bool
 do_property_multiply (const SGPropertyNode * arg)
 {
-  const string & propname = arg->getStringValue("property", "");
-  if (propname == "")
-    return false;
+  SGPropertyNode * prop = get_prop(arg);
+  double factor = arg->getDoubleValue("factor", 1);
 
-  SGPropertyNode * node = fgGetNode(propname, true);
-
-  switch (node->getType()) {
-  case SGPropertyNode::BOOL:
-    return node->setBoolValue(node->getBoolValue() &&
-			      arg->getBoolValue("factor"));
-  case SGPropertyNode::INT:
-    return node->setIntValue(int(node->getIntValue()
-				 * arg->getDoubleValue("factor")));
-  case SGPropertyNode::LONG:
-    return node->setLongValue(long(node->getLongValue()
-				   * arg->getDoubleValue("factor")));
-  case SGPropertyNode::FLOAT:
-    return node->setFloatValue(float(node->getFloatValue()
-				     * arg->getDoubleValue("factor")));
-  case SGPropertyNode::DOUBLE:
-  case SGPropertyNode::UNSPECIFIED:
-    return node->setDoubleValue(node->getDoubleValue()
-				* arg->getDoubleValue("factor"));
-  default:			// doesn't make sense with strings
-    return false;
-  }
+  double unmodifiable, modifiable;
+  split_value(prop->getDoubleValue(), arg->getStringValue("mask", "all"),
+              &unmodifiable, &modifiable);
+  modifiable *= factor;
+  limit_value(&modifiable, arg);
+
+  prop->setDoubleValue(unmodifiable + modifiable);
+
+  return true;
 }
 
 
@@ -388,23 +912,20 @@ do_property_multiply (const SGPropertyNode * arg)
  * property[1]: the name of the second property.
  */
 static bool
-do_property_swap (const SGPropertyNode * arg, SGCommandState ** state)
+do_property_swap (const SGPropertyNode * arg)
 {
-  const string &propname1 = arg->getStringValue("property[0]", "");
-  const string &propname2 = arg->getStringValue("property[1]", "");
-  if (propname1 == "" || propname2 == "")
-    return false;
+  SGPropertyNode * prop1 = get_prop(arg);
+  SGPropertyNode * prop2 = get_prop2(arg);
 
-  SGPropertyNode * node1 = fgGetNode(propname1, true);
-  SGPropertyNode * node2 = fgGetNode(propname2, true);
-  const string & tmp = node1->getStringValue();
-  return (node1->setUnspecifiedValue(node2->getStringValue()) &&
-	  node2->setUnspecifiedValue(tmp));
+				// FIXME: inefficient
+  const string & tmp = prop1->getStringValue();
+  return (prop1->setUnspecifiedValue(prop2->getStringValue()) &&
+	  prop2->setUnspecifiedValue(tmp.c_str()));
 }
 
 
 /**
- * Set a property to an axis or other moving input.
+ * Built-in command: Set a property to an axis or other moving input.
  *
  * property: the name of the property to set.
  * setting: the current input setting, usually between -1.0 and 1.0.
@@ -412,17 +933,472 @@ do_property_swap (const SGPropertyNode * arg, SGCommandState ** state)
  * factor: the factor to multiply by (use negative to reverse).
  */
 static bool
-do_property_scale (const SGPropertyNode * arg, SGCommandState ** state)
+do_property_scale (const SGPropertyNode * arg)
 {
-  const string &propname = arg->getStringValue("property");
-  double setting = arg->getDoubleValue("setting", 0.0);
+  SGPropertyNode * prop = get_prop(arg);
+  double setting = arg->getDoubleValue("setting");
   double offset = arg->getDoubleValue("offset", 0.0);
   double factor = arg->getDoubleValue("factor", 1.0);
-  return fgSetDouble(propname, (setting + offset) * factor);
+  bool squared = arg->getBoolValue("squared", false);
+  int power = arg->getIntValue("power", (squared ? 2 : 1));
+
+  int sign = (setting < 0 ? -1 : 1);
+
+  switch (power) {
+  case 1:
+      break;
+  case 2:
+      setting = setting * setting * sign;
+      break;
+  case 3:
+      setting = setting * setting * setting;
+      break;
+  case 4:
+      setting = setting * setting * setting * setting * sign;
+      break;
+  default:
+      setting =  pow(setting, power);
+      if ((power % 2) == 0)
+          setting *= sign;
+      break;
+  }
+
+  return prop->setDoubleValue((setting + offset) * factor);
 }
 
 
-
+/**
+ * Built-in command: cycle a property through a set of values.
+ *
+ * If the current value isn't in the list, the cycle will
+ * (re)start from the beginning.
+ *
+ * property: the name of the property to cycle.
+ * value[*]: the list of values to cycle through.
+ */
+static bool
+do_property_cycle (const SGPropertyNode * arg)
+{
+    SGPropertyNode * prop = get_prop(arg);
+    vector<SGPropertyNode_ptr> values = arg->getChildren("value");
+    int selection = -1;
+    int nSelections = values.size();
+
+    if (nSelections < 1) {
+        SG_LOG(SG_GENERAL, SG_ALERT, "No values for property-cycle");
+        return false;
+    }
+
+                                // Try to find the current selection
+    for (int i = 0; i < nSelections; i++) {
+        if (compare_values(prop, values[i])) {
+            selection = i + 1;
+            break;
+        }
+    }
+
+                                // Default or wrap to the first selection
+    if (selection < 0 || selection >= nSelections)
+        selection = 0;
+
+    prop->setUnspecifiedValue(values[selection]->getStringValue());
+    return true;
+}
+
+
+/**
+ * Built-in command: randomize a numeric property value.
+ *
+ * property: the name of the property value to randomize.
+ * min: the minimum allowed value.
+ * max: the maximum allowed value.
+ */
+static bool
+do_property_randomize (const SGPropertyNode * arg)
+{
+    SGPropertyNode * prop = get_prop(arg);
+    double min = arg->getDoubleValue("min", DBL_MIN);
+    double max = arg->getDoubleValue("max", DBL_MAX);
+    prop->setDoubleValue(sg_random() * (max - min) + min);
+    return true;
+}
+
+
+/**
+ * Built-in command: reinit the data logging system based on the
+ * current contents of the /logger tree.
+ */
+static bool
+do_data_logging_commit (const SGPropertyNode * arg)
+{
+    FGLogger *log = (FGLogger *)globals->get_subsystem("logger");
+    log->reinit();
+    return true;
+}
+
+/**
+ * Built-in command: Add a dialog to the GUI system.  Does *not*
+ * display the dialog.  The property node should have the same format
+ * as a dialog XML configuration.  It must include:
+ *
+ * name: the name of the GUI dialog for future reference.
+ */
+static bool
+do_dialog_new (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+
+    // Note the casting away of const: this is *real*.  Doing a
+    // "dialog-apply" command later on will mutate this property node.
+    // I'm not convinced that this isn't the Right Thing though; it
+    // allows client to create a node, pass it to dialog-new, and get
+    // the values back from the dialog by reading the same node.
+    // Perhaps command arguments are not as "const" as they would
+    // seem?
+    gui->newDialog((SGPropertyNode*)arg);
+    return true;
+}
+
+/**
+ * Built-in command: Show an XML-configured dialog.
+ *
+ * dialog-name: the name of the GUI dialog to display.
+ */
+static bool
+do_dialog_show (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+    gui->showDialog(arg->getStringValue("dialog-name"));
+    return true;
+}
+
+
+/**
+ * Built-in Command: Hide the active XML-configured dialog.
+ */
+static bool
+do_dialog_close (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+    if(arg->hasValue("dialog-name"))
+        return gui->closeDialog(arg->getStringValue("dialog-name"));
+    return gui->closeActiveDialog();
+}
+
+
+/**
+ * Update a value in the active XML-configured dialog.
+ *
+ * object-name: The name of the GUI object(s) (all GUI objects if omitted).
+ */
+static bool
+do_dialog_update (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+    FGDialog * dialog;
+    if (arg->hasValue("dialog-name"))
+        dialog = gui->getDialog(arg->getStringValue("dialog-name"));
+    else
+        dialog = gui->getActiveDialog();
+
+    if (dialog != 0) {
+        dialog->updateValues(arg->getStringValue("object-name"));
+        return true;
+    } else {
+        return false;
+    }
+}
+
+
+/**
+ * Apply a value in the active XML-configured dialog.
+ *
+ * object-name: The name of the GUI object(s) (all GUI objects if omitted).
+ */
+static bool
+do_dialog_apply (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+    FGDialog * dialog;
+    if (arg->hasValue("dialog-name"))
+        dialog = gui->getDialog(arg->getStringValue("dialog-name"));
+    else
+        dialog = gui->getActiveDialog();
+
+    if (dialog != 0) {
+        dialog->applyValues(arg->getStringValue("object-name"));
+        return true;
+    } else {
+        return false;
+    }
+}
+
+
+/**
+ * Redraw GUI (applying new widget colors). Doesn't reload the dialogs,
+ * unlike reinit().
+ */
+static bool
+do_gui_redraw (const SGPropertyNode * arg)
+{
+    NewGUI * gui = (NewGUI *)globals->get_subsystem("gui");
+    gui->redraw();
+    return true;
+}
+
+/**
+ * Built-in command: play an audio message (i.e. a wav file) This is
+ * fire and forget.  Call this once per message and it will get dumped
+ * into a queue.  Messages are played sequentially so they do not
+ * overlap.
+ */
+static bool
+do_play_audio_message (const SGPropertyNode * arg)
+{
+    FGFX *fx = (FGFX *)globals->get_subsystem("fx");
+    string path = arg->getStringValue("path");
+    string file = arg->getStringValue("file");
+    double volume = arg->getDoubleValue("volume");
+    // cout << "playing " << path << " / " << file << endl;
+    fx->play_message( path, file, volume );
+
+    return true;
+}
+
+/**
+ * Built-in command: commit presets (read from in /sim/presets/)
+ */
+static bool
+do_presets_commit (const SGPropertyNode * arg)
+{
+    // unbind the current fdm state so property changes
+    // don't get lost when we subsequently delete this fdm
+    // and create a new one.
+    cur_fdm_state->unbind();
+        
+    // set position from presets
+    fgInitPosition();
+
+    fgReInitSubsystems();
+
+    globals->get_tile_mgr()->update( fgGetDouble("/environment/visibility-m") );
+
+#if 0
+    if ( ! fgGetBool("/sim/presets/onground") ) {
+        fgSetBool( "/sim/freeze/master", true );
+        fgSetBool( "/sim/freeze/clock", true );
+    }
+#endif
+
+    return true;
+}
+
+/**
+ * Built-in command: set log level (0 ... 7)
+ */
+static bool
+do_log_level (const SGPropertyNode * arg)
+{
+   sglog().setLogLevels( SG_ALL, (sgDebugPriority)arg->getIntValue() );
+
+   return true;
+}
+
+/**
+ * Built-in command: replay the FDR buffer
+ */
+static bool
+do_replay (const SGPropertyNode * arg)
+{
+    // freeze the master fdm
+    fgSetInt( "/sim/freeze/replay-state", 1 );
+
+    FGReplay *r = (FGReplay *)(globals->get_subsystem( "replay" ));
+
+    fgSetDouble( "/sim/replay/start-time", r->get_start_time() );
+    fgSetDouble( "/sim/replay/end-time", r->get_end_time() );
+    double duration = fgGetDouble( "/sim/replay/duration" );
+    if( duration && duration < (r->get_end_time() - r->get_start_time()) ) {
+        fgSetDouble( "/sim/replay/time", r->get_end_time() - duration );
+    } else {
+        fgSetDouble( "/sim/replay/time", r->get_start_time() );
+    }
+
+    // cout << "start = " << r->get_start_time()
+    //      << "  end = " << r->get_end_time() << endl;
+
+    return true;
+}
+
+
+/**
+ * Return terrain elevation for given longitude/latitude pair.
+ */
+static bool
+do_terrain_elevation (const SGPropertyNode * arg)
+{
+    double lon = arg->getDoubleValue("longitude-deg", 0.0);
+    double lat = arg->getDoubleValue("latitude-deg", 0.0);
+    double elev;
+    bool ret = globals->get_scenery()->get_elevation_m(lat, lon, 10000.0, elev, 0, false);
+    const_cast<SGPropertyNode *>(arg)->setDoubleValue("elevation-m", elev);
+    return ret;
+}
+
+
+static bool
+do_decrease_visibility (const SGPropertyNode * arg)
+{
+    double new_value = fgGetDouble("/environment/visibility-m") * 0.9;
+    fgSetDouble("/environment/visibility-m", new_value);
+    fgDefaultWeatherValue("visibility-m", new_value);
+    globals->get_subsystem("environment")->reinit();
+
+    return true;
+}
+ 
+static bool
+do_increase_visibility (const SGPropertyNode * arg)
+{
+    double new_value = fgGetDouble("/environment/visibility-m") * 1.1;
+    fgSetDouble("/environment/visibility-m", new_value);
+    fgDefaultWeatherValue("visibility-m", new_value);
+    globals->get_subsystem("environment")->reinit();
+
+    return true;
+}
+
+static bool
+do_hud_init(const SGPropertyNode *)
+{
+    fgHUDInit(0); // minimal HUD
+    return true;
+}
+
+static bool
+do_hud_init2(const SGPropertyNode *)
+{
+    fgHUDInit2(0);  // normal HUD
+    return true;
+}
+
+/**
+ * An fgcommand to allow loading of xml files via nasal,
+ * the xml file's structure will be made available within
+ * a (definable) property tree node
+ *
+ * @param filename a string to hold the complete path & filename of a XML file
+ * @param targetnode a string pointing to a location within the property tree
+ * where to store the parsed XML file
+ */
+
+static bool 
+do_load_xml_to_proptree(const SGPropertyNode * node)
+{
+    // SG_LOG(SG_GENERAL, SG_ALERT, "fgcommand loadxml executed");
+
+    SGPropertyNode * targetnode;
+    targetnode = fgGetNode(node->getNode("targetnode")->getStringValue(),true);
+		
+    const char *filename = node->getNode("filename")->getStringValue();
+    try {
+        fgLoadProps(filename, targetnode);
+    } catch (const sg_exception &e) {
+        string errmsg = "Error reading file " + string(filename) + ":\n";
+        guiErrorMessage(errmsg.c_str(), e);
+        return false;
+    }
+
+    return  true;
+}
+
+
+/**
+ * an fgcommand to allow saving of xml files via nasal,
+ * the file's structure will be determined based on what's
+ * encountered in the passed (source) property tree node
+ *
+ * @param filename a string to hold the complete path & filename of the (new)
+ * XML file
+ * @param sourcenode a string pointing to a location within the property tree
+ * where to find the nodes that should be written recursively into an XML file
+ *
+ * TODO: 
+ *   deal with already existing filenames, optionally return error/success
+ *   values in a separate node to provide status information
+ *
+ * note: it's directly using writeProperties, which is not necessarily
+ *       preferable, but for now it should work ...
+ */
+
+static bool 
+do_save_xml_from_proptree(const SGPropertyNode * node)
+{
+    //TODO: do Parameter validation !
+    SGPropertyNode * sourcenode;
+    sourcenode = fgGetNode(node->getNode("sourcenode")->getStringValue(),true);
+
+    const char *filename = node->getNode("filename")->getStringValue();
+    try {
+        writeProperties (filename, sourcenode, true);
+    } catch (const sg_exception &e) {
+        string errmsg = "Error writing file " + string(filename) + ":\n";
+        guiErrorMessage(errmsg.c_str(), e);
+        return false;
+    }
+
+    return true;
+}
+
+static bool
+do_press_cockpit_button (const SGPropertyNode *arg)
+{
+  const char *prefix = arg->getStringValue("prefix");
+
+  if (arg->getBoolValue("guarded") && fgGetDouble((string(prefix) + "-guard").c_str()) < 1)
+    return true;
+
+  string prop = string(prefix) + "-button";
+  double value;
+
+  if (arg->getBoolValue("latching"))
+    value = fgGetDouble(prop.c_str()) > 0 ? 0 : 1;
+  else
+    value = 1;
+
+  fgSetDouble(prop.c_str(), value);
+  fgSetBool(arg->getStringValue("discrete"), value > 0);
+
+  return true;
+}
+
+static bool
+do_release_cockpit_button (const SGPropertyNode *arg)
+{
+  const char *prefix = arg->getStringValue("prefix");
+
+  if (arg->getBoolValue("guarded")) {
+    string prop = string(prefix) + "-guard";
+    if (fgGetDouble(prop.c_str()) < 1) {
+      fgSetDouble(prop.c_str(), 1);
+      return true;
+    }
+  }
+
+  if (! arg->getBoolValue("latching")) {
+    fgSetDouble((string(prefix) + "-button").c_str(), 0);
+    fgSetBool(arg->getStringValue("discrete"), false);
+  }
+
+  return true;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+// Command setup.
+////////////////////////////////////////////////////////////////////////
+
+
 /**
  * Table of built-in commands.
  *
@@ -434,21 +1410,56 @@ static struct {
   SGCommandMgr::command_t command;
 } built_ins [] = {
     { "null", do_null },
+#if defined(HAVE_PLIB_PSL)
+    { "script", do_script },
+#endif // HAVE_PLIB_PSL
+    { "nasal", do_nasal },
     { "exit", do_exit },
+    { "reinit", do_reinit },
+    { "suspend", do_reinit },
+    { "resume", do_reinit },
     { "load", do_load },
     { "save", do_save },
     { "panel-load", do_panel_load },
+    { "panel-mouse-click", do_panel_mouse_click },
     { "preferences-load", do_preferences_load },
     { "view-cycle", do_view_cycle },
     { "screen-capture", do_screen_capture },
+    { "hires-screen-capture", do_hires_screen_capture },
     { "tile-cache-reload", do_tile_cache_reload },
-    { "lighting-update", do_lighting_update },
+    { "set-sea-level-air-temp-degc", do_set_sea_level_degc },
+    { "set-outside-air-temp-degc", do_set_oat_degc },
+    { "set-dewpoint-sea-level-air-temp-degc", do_set_dewpoint_sea_level_degc },
+    { "set-dewpoint-temp-degc", do_set_dewpoint_degc },
+    { "timeofday", do_timeofday },
     { "property-toggle", do_property_toggle },
     { "property-assign", do_property_assign },
     { "property-adjust", do_property_adjust },
     { "property-multiply", do_property_multiply },
     { "property-swap", do_property_swap },
     { "property-scale", do_property_scale },
+    { "property-cycle", do_property_cycle },
+    { "property-randomize", do_property_randomize },
+    { "data-logging-commit", do_data_logging_commit },
+    { "dialog-new", do_dialog_new },
+    { "dialog-show", do_dialog_show },
+    { "dialog-close", do_dialog_close },
+    { "dialog-update", do_dialog_update },
+    { "dialog-apply", do_dialog_apply },
+    { "gui-redraw", do_gui_redraw },
+    { "play-audio-message", do_play_audio_message },
+    { "presets-commit", do_presets_commit },
+    { "log-level", do_log_level },
+    { "replay", do_replay },
+    { "terrain-elevation", do_terrain_elevation },
+    { "decrease-visibility", do_decrease_visibility },
+    { "increase-visibility", do_increase_visibility },
+    { "hud-init", do_hud_init },
+    { "hud-init2", do_hud_init2 },
+    { "loadxml", do_load_xml_to_proptree},
+    { "savexml", do_save_xml_from_proptree },    
+    { "press-cockpit-button", do_press_cockpit_button },
+    { "release-cockpit-button", do_release_cockpit_button },
     { 0, 0 }			// zero-terminated
 };
 
@@ -467,6 +1478,10 @@ fgInitCommands ()
     globals->get_commands()->addCommand(built_ins[i].name,
 					built_ins[i].command);
   }
+
+  typedef bool (*dummy)();
+  fgTie( "/command/view/next", dummy(0), do_view_next );
+  fgTie( "/command/view/prev", dummy(0), do_view_prev );
 }
 
-// end of fg_commands.hxx
+// end of fg_commands.cxx