QNexusWidget: shapes configuration storage (ConfigDict) does not handle empty tuples

[woutdenolf]

At BM23 I always see this error when starting PyMca

Traceback (most recent call last):
  File "<string>", line 992, in __configurePyMca
  File ".../python3.12/site-packages/PyMca5/PyMcaGui/io/hdf5/QNexusWidget.py", line 460, in setWidgetConfiguration
    self.cntTable.build(self._cntList, self._aliasList, shapelist=self._shapeList)
  File ".../python3.12/site-packages/PyMca5/PyMcaGui/io/hdf5/HDF5CounterTable.py", line 295, in build
    self.__addLine(i, posixpath.basename(cntlist[i]), shape=self.shapeList[i])
  File ".../python3.12/site-packages/PyMca5/PyMcaGui/io/hdf5/HDF5CounterTable.py", line 331, in __addLine
    widget = CntSelectionType(self, i, j, shape=shape)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../python3.12/site-packages/PyMca5/PyMcaGui/io/hdf5/HDF5CounterTable.py", line 77, in __init__
    self._index.setMaximum(min(maximum,2**31)  - 1)
                           ^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'int' and 'str'

In PyMca.ini I see this

[PyMca.HDF5.WidgetConfiguration]
mca = False
auto = ADD
2d = False
3d = False
counters = /pilatus_integrate/integrated/2th, /pilatus_integrate/integrated/intensity, /instrument/EurothermNanodac/measure, /instrument/nanodacT/data, /start_time, /measurement/diagbpm, /pilatus_integrate/integrated/points, /measurement/pilatus_integrated
aliases = 2th, intensity, measure, data, start_time, diagbpm, points, pilatus_integrated
shapes = None
	1, 10000
	()
	None
	()
	1, 1088, 1456
	None
	1, 10000

It is fixed by modifying the file to this

[PyMca.HDF5.WidgetConfiguration]
mca = False
auto = ADD
2d = False
3d = False
counters = /pilatus_integrate/integrated/2th, /pilatus_integrate/integrated/intensity, /instrument/EurothermNanodac/measure, /instrument/nanodacT/data, /start_time, /measurement/diagbpm, /pilatus_integrate/integrated/points, /measurement/pilatus_integrated
aliases = 2th, intensity, measure, data, start_time, diagbpm, points, pilatus_integrated
shapes = None
	1, 10000
	
	None
	
	1, 1088, 1456
	None
	1, 10000

So it seems that something is converting the shape tuple to a list before saving the configuration but this does not handle empty tuples

from PyMca5.PyMcaIO import ConfigDict

d = ConfigDict.ConfigDict()
config = {"Section": {"shapes": [None, tuple(), [1, 2, 3], [], None]}}
d.update(config)
d.write("test_pymca.ini")

d = ConfigDict.ConfigDict()
d.read("test_pymca.ini")
print(d)

This is where the string '()' comes from

{'Section': {'shapes': ['None', '()', [1, 2, 3], '', 'None']}}

which is then causing maximum = "(" which causes the error.

[vasole]

Side effect of adding the possibility to browse multidimensional arrays.

If you cannot manage to handle the (), my feeling is that field might not need to be included when saving the settings. Only the name of the dataset and the alias should be relevant. I expect shapes to be updated when selecting a scan.