feat: add .view()

[samwaseda]

Closes #304

I absolutely love it

[github-actions]

👈 Launch a binder notebook on branch pyiron/flowrep/display

[codecov]

Codecov Report

❌ Patch coverage is 89.79592% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.80%. Comparing base (c1225b0) to head (0f797b9).

Files with missing lines	Patch %	Lines
src/flowrep/retrospective/viewer.py	90.90%	4 Missing ⚠️
src/flowrep/retrospective/datastructures.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
- Coverage   99.94%   99.80%   -0.15%     
==========================================
  Files          43       44       +1     
  Lines        3470     3519      +49     
==========================================
+ Hits         3468     3512      +44     
- Misses          2        7       +5     

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[samwaseda]

@copilot Address the mypy problem

[Copilot]

@copilot Address the mypy problem

Fixed in b098854. The mypy error was from mutating a value narrowed as Mapping, so I changed that path to build a new dict instead. I also verified python -m mypy src/flowrep/retrospective/datastructures.py passes locally.

[Copilot]

Pull request overview

This PR addresses readability concerns for retrospective DAG data (#304) by adding a notebook-friendly .view() method to retrospective NodeData objects, rendering them as structured/collapsible JSON via IPython’s JSON display helper.

Changes:

• Add NodeData.view() plus internal helpers to serialize retrospective objects into JSON-friendly structures and display them with IPython.display.JSON.
• Add unit tests for .view() and the JSON display helper (skipped when IPython is unavailable).
• Add a minimal identity atomic in the static test library to support the new view tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/flowrep/retrospective/datastructures.py	Adds .view() to NodeData and implements _to_jsonable + _display_json to produce notebook-friendly JSON output.
tests/unit/test_retrospective_wfms.py	Adds tests validating .view() behavior and the _display_json helper, gated on IPython availability.
tests/flowrep_static/library.py	Adds a simple identity atomic used by the new view tests.

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[liamhuber]

Yep, I love the way it looks too!

Only technical notes:

• At 40 lines, let's go ahead an refactor it over to its own module flowrep.retrospective.viewer, and have NodeData.view just call the view routine from there (should have no trouble with circular imports because viewer should only need NodeData behind a IF_TYPE_CHECKING:)
• Let's have a backup str representation when ipython is not available; NodeData.view turns into viewer._view_json, write a simple viewer._view_str, and have viewer.view branch to either depending on _has_ipython
• Formalize the optionality, but adding a new optional dependency section to the pyproject.toml -- I think "dataviewer" is an ok name but don't feel strongly
• Fix the coverage by adding ipython to the .ci_support/environment-optional.yml; the CI is already set up so this will get it into the main testing cycle and clock our coverage, but the skipif stuff is still brilliant because we also do a separate test run without these optional dependencies

[liamhuber]

• Let's have a backup str representation when ipython is not available

I don't really care how pretty this is; if you're feeling lazy str(data) is already enough for me -- it's just about making sure there is a non-destructive branch to follow so users who ask for view() when it's not there can avoid a hard exception.

[samwaseda]

Yep, I love the way it looks too!

Only technical notes:

• At 40 lines, let's go ahead an refactor it over to its own module flowrep.retrospective.viewer, and have NodeData.view just call the view routine from there (should have no trouble with circular imports because viewer should only need NodeData behind a IF_TYPE_CHECKING:)
• Let's have a backup str representation when ipython is not available; NodeData.view turns into viewer._view_json, write a simple viewer._view_str, and have viewer.view branch to either depending on _has_ipython
• Formalize the optionality, but adding a new optional dependency section to the pyproject.toml -- I think "dataviewer" is an ok name but don't feel strongly
• Fix the coverage by adding ipython to the .ci_support/environment-optional.yml; the CI is already set up so this will get it into the main testing cycle and clock our coverage, but the skipif stuff is still brilliant because we also do a separate test run without these optional dependencies

@copilot Address these points

[samwaseda]

oh my goodness what can I do without AI...

[liamhuber]

Let's do Niklas' reprjson idea as well, then I'm happy

[liamhuber]

Ruff should complain about this non-head import. Since viewer only imports this module behind a type checking flag, it should be perfectly safe to move this up to the top

[liamhuber]

And the moment this is in we can go ahead and make a patch release. It's great and simple so let's get it available