Refactor of way serialization of layers is done within a maya scene file

CHANGELOG.md

@@ -1,3 +1,15 @@
+## v0.??.? (????-??-??)
+
+### Added
+
+
+### Changed
+
+* Using -muted/-m flag with AL_usdmaya_LayerGetLayers now returns layer display names by default, and identifiers if
+  the -identifiers/-id flag is set.  This makes it more in line with all the other flags for the command (and more
+  flexible), but is a change in behavior - previously, the muted layers would ALWAYS be returned as identifier.
+
+
 ## v0.25.0 (2017-11-28)
 
 ### Added

CMakeLists.txt

@@ -53,6 +53,7 @@ include_directories(${PXR_INCLUDE_DIRS})
 # is the rationale for listing them here.
 find_package(Boost COMPONENTS
                 python
+                thread
                 REQUIRED
 )
 

docs/layers.md

@@ -14,7 +14,6 @@ Normally, the default Edit Target in USD will be the Root Layer of the scene, al
 #### Commands 
 There are a number of layer-related commands available, all are available via MEL, and some from the USD->Layers dropdow in the UI.
 + AL_usdmaya_LayerSave
-+ AL_usdmaya_LayerCreateSubLayer
 + AL_usdmaya_LayerCreateLayer
 + AL_usdmaya_LayerCurrentEditTarget
 + AL_usdmaya_LayerGetLayers

lib/AL_USDMaya/AL/maya/CommandGuiHelper.cpp

@@ -235,6 +235,35 @@ CommandGuiHelper::~CommandGuiHelper()
   MGlobal::executeCommand(MString(m_controls.str().data(), m_controls.str().size()));
 }
 
+//----------------------------------------------------------------------------------------------------------------------
+void CommandGuiHelper::addExecuteText(const char* toAdd)
+{
+  // TODO: write a proper string encoder for MEL (tricky, because can't represent
+  // all 256 character-bytes using mel string literals - would have to resort to
+  // calling out to python for a truly string rerpr encoder.
+  // (note that even mel's builtin "encodeString" command doesn't actually always
+  // return a mel string that will evaluate to the input - ie, it will return
+  // "\004", but that isn't a valid mel escape sequence, and will just result in "004"
+
+  // for now, just check to make sure we have printable characters... only need to
+  // implement a full MEL-string-encoder if we really have a need...
+  m_execute << "    $str += \"";
+
+  for(size_t i = 0; toAdd[i] != '\0'; ++i)
+  {
+    if(toAdd[i] < 32 || toAdd[i] > 126)
+    {
+      // Just throwing, if we ever need to use a string with weird chars, need to
+      // update this function...
+      throw std::logic_error("CommandGuiHelper::addExecuteText may only be called with normal printable characters");
+    }
+    else if (toAdd[i] == '"') m_execute << "\\\"";
+    else if (toAdd[i] == '\\') m_execute << "\\\\";
+    else m_execute << toAdd[i];
+  }
+  m_execute << "\";\n";
+}
+
 //----------------------------------------------------------------------------------------------------------------------
 void CommandGuiHelper::addFlagOption(const char* commandFlag, const char* label, const bool defaultVal, bool persist)
 {
@@ -314,7 +343,7 @@ void CommandGuiHelper::addBoolOption(const char* commandFlag, const char* label,
 }
 
 //----------------------------------------------------------------------------------------------------------------------
-void CommandGuiHelper::addListOption(const char* commandFlag, const char* label, GenerateListFn generateList)
+void CommandGuiHelper::addListOption(const char* commandFlag, const char* label, GenerateListFn generateList, bool isMandatory)
 {
   const std::string optionVar = m_commandName + "_" + commandFlag;
   const std::string getOptionVar = std::string("`optionVar -q -sl \"") + optionVar + "\"`";
@@ -336,7 +365,11 @@ void CommandGuiHelper::addListOption(const char* commandFlag, const char* label,
 
   //
   m_execute << "  global string $" << optionVar << "_sl;"
-            << "  $str += \" -" << commandFlag << " $" << optionVar << "_sl \";\n";
+            << "  $str += \" ";
+  if (!isMandatory) {
+    m_execute << "-" << commandFlag << " ";
+  }
+  m_execute << "$" << optionVar << "_sl \";\n";
 }
 
 //----------------------------------------------------------------------------------------------------------------------

lib/AL_USDMaya/AL/maya/CommandGuiHelper.h

@@ -131,6 +131,11 @@ class CommandGuiHelper
   /// \brief  dtor - auto generates, and executes the GUI code.
   ~CommandGuiHelper();
 
+  /// \brief  add some text to the execute command, unconditionally
+  ///         Useful if, ie, you always want to set a non-default command flag
+  /// \param  toAdd   extra flags / text to add to the execution command
+  void addExecuteText(const char* toAdd);
+
   /// \brief  add a boolean option value to the GUI
   /// \param  commandFlag   the flag for the command
   /// \param  label   human readable GUI label for the option
@@ -230,7 +235,8 @@ class CommandGuiHelper
   /// \param  commandFlag   the flag for the command
   /// \param  label   human readable GUI label for the option
   /// \param  generateList   The C++ command to build up a list of text strings for the GUI to display
-  void addListOption(const char* commandFlag, const char* label, GenerateListFn generateList);
+  /// \param  isMandatory   If true, our commandFlag is actually a mandatory argument, not a option / flag
+  void addListOption(const char* commandFlag, const char* label, GenerateListFn generateList, bool isMandatory=false);
 
   /// \brief  add an enum option value to the GUI
   /// \param  commandFlag   the flag for the command

lib/AL_USDMaya/AL/maya/Common.h

@@ -129,6 +129,40 @@ class ProfilerSectionTag;
     MGlobal::displayError(maya_error_string); \
   } }
 
+/// \brief  Given the status, validates that the status is ok. If not, an error is logged using the specified error
+///         message. If an error occurs, then a "continue" statement is issued (and so should be used in loops).
+/// \ingroup   mayautils
+#define AL_MAYA_CHECK_ERROR_CONTINUE(status, ErrorString) { \
+  MStatus _status_##__LINE__ = status; \
+  if (!_status_##__LINE__) \
+  { \
+    MString maya_error_string = __FILE__ ":"; \
+    maya_error_string += __LINE__; \
+    maya_error_string += " "; \
+    maya_error_string += _status_##__LINE__.errorString(); \
+    maya_error_string += " : "; \
+    maya_error_string += ErrorString; \
+    MGlobal::displayError(maya_error_string); \
+    continue; \
+  } }
+
+/// \brief  Given the status, validates that the status is ok. If not, an error is logged using the specified error
+///         message. If an error occurs, then exit immediately, with no return.
+/// \ingroup   mayautils
+#define AL_MAYA_CHECK_ERROR_RETURN(status, ErrorString) { \
+  MStatus _status_##__LINE__ = status; \
+  if (!_status_##__LINE__) \
+  { \
+    MString maya_error_string = __FILE__ ":"; \
+    maya_error_string += __LINE__; \
+    maya_error_string += " "; \
+    maya_error_string += _status_##__LINE__.errorString(); \
+    maya_error_string += " : "; \
+    maya_error_string += ErrorString; \
+    MGlobal::displayError(maya_error_string); \
+    return; \
+  } }
+
 /// \brief  Given the status, validates that the status is ok. If not, an error is logged using the specified error
 ///         message. If an error occurs, a null MObject is returned.
 /// \ingroup   mayautils

lib/AL_USDMaya/AL/maya/NodeHelper.cpp

@@ -1597,6 +1597,20 @@ MStatus NodeHelper::outputDataValue(MDataBlock& dataBlock, const MObject& attrib
   return status;
 }
 
+//----------------------------------------------------------------------------------------------------------------------
+MPxData* NodeHelper::outputDataValue(MDataBlock& dataBlock, const MObject& attribute)
+{
+  MStatus status;
+  MDataHandle outDataHandle = dataBlock.outputValue(attribute, &status);
+  if(status)
+  {
+    return outDataHandle.asPluginData();
+  }
+  report_get_error(attribute, MPxData, status);
+  return 0;
+}
+
+
 //----------------------------------------------------------------------------------------------------------------------
 MPxData* NodeHelper::createData(const MTypeId& dataTypeId, MObject& data)
 {

lib/AL_USDMaya/AL/maya/NodeHelper.h

@@ -60,13 +60,21 @@ namespace maya {
 /// \endcode
 /// \ingroup mayagui
 //----------------------------------------------------------------------------------------------------------------------
-#define AL_DECL_ATTRIBUTE(XX) \
+
+// For children of multi-attribute, a generic XXPlug() method
+// isn't very helpful, as we need to attach to a specific indexed
+// element plug of the parent array... and defining it just
+// creates a confusing name
+#define AL_DECL_MULTI_CHILD_ATTRIBUTE(XX) \
   private: \
   static MObject m_##XX; \
   public: \
-  MPlug XX##Plug() const { return MPlug( thisMObject(), m_##XX ); } \
   static const MObject& XX () { return m_##XX; }
 
+#define AL_DECL_ATTRIBUTE(XX) \
+  AL_DECL_MULTI_CHILD_ATTRIBUTE(XX) \
+  MPlug XX##Plug() const { return MPlug( thisMObject(), m_##XX ); } \
+
 //----------------------------------------------------------------------------------------------------------------------
 /// \brief  This is a little helper object designed to reduce the amount of boilerplate GUI code you need to jump through
 ///         to add your own nodes that match a USD schema type. It has been designed to attempt to match the attribute
@@ -481,6 +489,33 @@ class NodeHelper
   /// \return MS::kSuccess if all went well
   static MStatus outputDataValue(MDataBlock& dataBlock, const MObject& attribute, MPxData* value);
 
+  /// \brief  get an output data value from the dataBlock from the specified attribute
+  /// \param  dataBlock the data block to get the value from
+  /// \param  attribute the handle to the attribute to get an MPxData for
+  /// \return the value
+  /// \note   If the value could not be queried, and error will be logged to std::cerr
+  ///         Useful when you want to modify something on the underlying MPxData, without
+  ///         creating / setting an entirely new instance of the MPxData
+  static MPxData* outputDataValue(MDataBlock& dataBlock, const MObject& attribute);
+
+  /// \brief  get an output data value from the dataBlock from the specified attribute
+  /// \param  dataBlock the data block to get the value from
+  /// \param  attribute the handle to the attribute to get an MPxData subclass for
+  /// \return the value
+  /// \note   If the value could not be queried, and error will be logged to std::cerr
+  ///         Useful when you want to modify something on the underlying MPxData subclass, without
+  ///         creating / setting an entirely new instance of the MPxData subclass
+  template<typename MPxDataType>
+  static MPxDataType* outputDataValue(MDataBlock& dataBlock, const MObject& attribute)
+  {
+    MPxData* data = NodeHelper::outputDataValue(dataBlock, attribute);
+    if(data)
+    {
+      return dynamic_cast<MPxDataType*>(data);
+    }
+    return 0;
+  }
+
   /// \brief  helper method to create new data objects of the specified data type
   /// \param  dataTypeId the MTypeId of the plugin data object to create
   /// \param  data the returned handle to the created data object, usually passed to MDataHandle::set, or MPlug::setValue.

lib/AL_USDMaya/AL/usdmaya/Common.h

@@ -43,7 +43,6 @@ namespace cmds {
 struct CompareLayerHandle;
 class LayerCommandBase;
 class LayerConstructTree;
-class LayerCreateSubLayer;
 class LayerCurrentEditTarget;
 class LayerExport;
 class LayerGetLayers;