[pdal] How to invoke my custom writer?

[Paul Schrum]

I am developing a custom PDAL writer for my GSoC project. (Link
<https://trac.osgeo.org/grass/wiki/GSoC/2017/IntegrationOfPDALintoGRASSGIS>)
Source Code is on github <https://github.com/PaulSchrum/v_in_pdal>.  The
module compiles, but it is an intermediate state since I am in the process
of developing it.

I have the custom writer, PdalVectorMapWriter,  inheriting from writer and
it compiles okay.  Currently all functions just print out their own name
and return.

In main.cpp I create the pipeline json string and create a PipelineExecutor
with it.  I then call pipeline-> validate.  This throws an exception
stating

terminate called after throwing an instance of 'pdal::pdal_error'
  what():  Couldn't create writer stage of type
'writers.PdalVectorMapWriter'.

So I am thinking that I need somehow to inform Pdal about an instance of
the class.  But as I go over the Pdal documentation, I do not see how to do
that.  Can someone help me understand what I need to do?

- Paul

Here is a key code snippet:
81    std::string pipeline_json =
82            pipelineJson::basicVectorMapReaderWriter(inFile,outFile);
83
84    cout << pipeline_json << endl;  //diagnostic only
85    cout << endl;
86    G_important_message(_("Running the pipeline ..."));
87    auto pipeline = new pdal::PipelineExecutor(pipeline_json);
88
87    cout << "is valid?  " << pipeline->validate() << endl;

Line 87 throws the exception.


Here is the json string being passed to the PipelineExecutor constructor:

{ "pipeline":[

"/home/user/Desktop/ALL/SourceModules/cpp/grass7_trunk/vector/v.in.pdal/testFiles/100-points.las",
{
   "type":"writers.PdalVectorMapWriter",
   "filename":"100-points"
}
 ]
}
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