Make label, description, and value optional on all attribute constructors

[fabiencastan]

Attribute constructors previously required explicit label, description, and value arguments. All three are now optional with sensible defaults, reducing boilerplate in node definitions.

# Before
desc.IntParam(name="nbPoints", label="Nb Points", description="", value=0, range=(0, 1000, 1))

# After
desc.IntParam(name="nbPoints", range=(0, 1000, 1))

Description

Makes label, description, and value optional on all attribute descriptor constructors (File, BoolParam, IntParam, FloatParam, StringParam, ColorParam, ChoiceParam, ListAttribute, GroupAttribute).

Features list

• label=None — auto-generated from name via camelCase/snake_case → Title Case (e.g. nbPoints → "Nb Points", my_attr → "My Attr")
• description=None — defaults to ""
• value=None on all param types:
  • Output attributes: isDynamicValue=True (dynamic, computed at runtime) — consistent with prior explicit value=None behavior
  • Input attributes: resolved to type's zero-value (int()→0, float()→0.0, bool()→False, str()→"")

Implementation remarks

• _labelFromName(name) in desc/attribute.py: regex inserts spaces at camelCase boundaries, underscores replaced with spaces, then title-cased.
• Input default resolution is in Attribute.getDefaultValue() (core/attribute.py): when _desc.value is None and isInput and _valueType is not None, returns _desc._valueType() instead of None.
• checkValueTypes() updated for all affected types to treat value=None as valid (no type error flagged).
• ChoiceParam.__init__ guarded with is not None (was using truthiness, which broke on empty list values with exclusive=False).
• Added checkValueTypes() to ColorParam, which was previously missing.

[codecov]

Codecov Report

❌ Patch coverage is 90.52632% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.06%. Comparing base (43a24bb) to head (1302d30).

Files with missing lines	Patch %	Lines
meshroom/core/desc/attribute.py	76.92%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3009      +/-   ##
===========================================
+ Coverage    81.99%   82.06%   +0.07%     
===========================================
  Files           69       69              
  Lines         9315     9396      +81     
===========================================
+ Hits          7638     7711      +73     
- Misses        1677     1685       +8     

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[Copilot]

Pull request overview

This PR reduces boilerplate in Meshroom node attribute descriptors by making label, description, and value optional across attribute constructors, with defaults derived from the attribute name and type-specific default values for inputs.

Changes:

• Added _labelFromName(name) and updated descriptor constructors to auto-generate label and default description to "".
• Updated descriptor checkValueTypes() implementations to treat value=None as valid for affected attribute types.
• Updated runtime input default resolution (Attribute.getDefaultValue) and added tests covering the new defaults.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
meshroom/core/desc/attribute.py	Makes descriptor ctor args optional; adds name→label generation; relaxes type checks for value=None; updates ChoiceParam / adds ColorParam.checkValueTypes().
meshroom/core/attribute.py	Changes runtime default-value resolution for input attributes when descriptor value is None.
tests/test_attributes.py	Adds tests for label generation and new default behaviors for input/output attributes when descriptor value=None.

---

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[Copilot]

ListAttribute and GroupAttribute are imported here but not used in this test module. Consider removing them to avoid unused imports and keep the test focused.

Suggested change

	from meshroom.core.desc.attribute import _labelFromName, StringParam, IntParam, FloatParam, BoolParam, File, ListAttribute, GroupAttribute
	from meshroom.core.desc.attribute import _labelFromName, StringParam, IntParam, FloatParam, BoolParam, File

[Copilot]

getDefaultValue() uses self._desc._valueType() when desc.value is None. For desc.ChoiceParam with exclusive=False, _valueType is the element type (e.g. str), so this produces "", which then gets validated into [""] for the attribute default. This breaks the expected empty-list default for non-exclusive ChoiceParams and can lead to incorrect CLI formatting/serialization behavior. Consider special-casing non-exclusive ChoiceParam to default to an empty list (and add a regression test).

Suggested change

	# value type, use the type's default constructor value (e.g. 0 for int, "" for str).
	if self._desc.value is None and self.isInput and self._desc._valueType is not None:
	# value type, use the type's default constructor value (e.g. 0 for int, "" for str),
	# except for non-exclusive ChoiceParam, which should default to an empty list.
	if self._desc.value is None and self.isInput and self._desc._valueType is not None:
	if isinstance(self._desc, desc.ChoiceParam) and not getattr(self._desc, "exclusive", True):
	return []

[Copilot]

In ChoiceParam.__init__, when exclusive=False and value is provided as an empty list, type(self._value[0]) will raise IndexError. Empty selections (value=[]) are a valid default for non-exclusive ChoiceParams, so this should be handled (e.g., derive the type from values when available, or fall back to None when the list is empty).

Suggested change

	# if non exclusive, it is a list
	self._valueType = type(self._value[0])
	# if non exclusive, it is a list; use the first element when available
	if self._value:
	self._valueType = type(self._value[0])
	else:
	# Empty selection: element type cannot be inferred yet
	self._valueType = None

[Copilot]

The constructor now defaults values=None, making ChoiceParam instantiable without any values. This is likely accidental (the PR description only mentions label/description/value becoming optional) and can lead to runtime failures because _valueType may remain None. Consider keeping values required (no default) or raising a clear error when values is not provided.

[Copilot]

ChoiceParam.checkValueTypes() returns early when _value is None, which means it no longer validates that _values is a list. As a result, misconfigured descriptors (e.g. values=None or a non-list) won't be flagged by checkValueTypes() even though they can break validation/conformance later. Consider still validating _values (or explicitly allowing None with a dedicated error/behavior).