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# listLightLinksCmd.cpp

    //-
    // ==========================================================================
    // Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
    //
    // Use of this software is subject to the terms of the Autodesk
    // license agreement provided at the time of installation or download,
    // or which otherwise accompanies this software in either electronic
    // or hard copy form.
    // ==========================================================================
    //+

    #include <maya/MSimple.h>
    #include <maya/MLightLinks.h>
    #include <maya/M3dView.h>
    #include <maya/MDagPathArray.h>
    #include <maya/MSelectionList.h>
    #include <maya/MDagPath.h>
    #include <maya/MGlobal.h>
    #include <maya/MStringArray.h>
    #include <maya/MItSelectionList.h>
    #include <math.h>

    DeclareSimpleCommand( listLightLinks, PLUGIN_COMPANY, "4.5");

    MStatus listLightLinks::doIt( const MArgList& args )
    //
    //  Description:
    //      Implements the MEL listLightLinks command.  After parsing the
    //      information stored in Maya's light linker nodes, it examines
    //      the first item on the selection list.  If the item is an object,
    //      then the command selects all lights that are linked to that object.
    //      If the item is a light, then it will select all of the objects
    //      that are linked to that light.
    //
    //  Arguments:
    //      args - The argument list that was passes to the command from MEL.
    //             This command takes no arguments.
    //
    //  Return Value:
    //      MS::kSuccess - command succeeded
    //      MS::kFailure - command failed (returning this value will cause the
    //                     MEL script that is being run to terminate unless the
    //                     error is caught using a "catch" statement.
    //
    {
        MStatus stat = MS::kSuccess;
        clearResult();

        // Parse the links on the current scene's light linker node(s).
        //
        MLightLinks lightLink;
        bool parseStatus;
        parseStatus = lightLink.parseLinks(MObject::kNullObj);

        if( !parseStatus )
        {
            setResult( "Error parsing light links\n" );
            return MS::kFailure;
        }

        // Get the first object (or component) on the selection list.
        //
        MSelectionList selectList;
        MDagPath dagPath;
        MObject component;
        MGlobal::getActiveSelectionList( selectList );
        selectList.getDagPath( 0, dagPath, component );
        dagPath.extendToShape();

        // Selection list to store entities linked to the selected light or
        // object.
        //
        MSelectionList newSelection;
        newSelection.clear();

        // Stores the command result.
        //
        char resultString[512];

        // If the object is a surface, we'll select all the lights linked to it.
        // If the object is a light, we'll select all the objects linked to it.
        //
        if( dagPath.hasFn( MFn::kLight ) )
        {
            // Select objects linked to this light.
            //
            MSelectionList objects;
            objects.clear();
            lightLink.getLinkedObjects( dagPath, objects );

            newSelection.merge( objects );

            sprintf( resultString, "Selecting objects linked to light %s",
                     dagPath.fullPathName().asChar() );

        }
        else
        {
            // Select lights linked to this object.
            //
            MDagPathArray lights;
            lights.clear();
            lightLink.getLinkedLights( dagPath, component, lights );

            for( unsigned int j = 0; j < lights.length(); j++ )
            {
                const MDagPath& path = lights[j];
                newSelection.add( path );
            }

            sprintf( resultString, "Selecting lights linked to object %s",
                     dagPath.fullPathName().asChar() );

        }

        // Select the linked entities.
        //
        MGlobal::setActiveSelectionList( newSelection );

        setResult( resultString );
        return stat;
    }