MAINT: Sync mne-feedstock and pyproject.toml

[larsoner]

... and if we want to be really complete, we should also make the conda-forge recipe for mne-base 100% consistent with the minimal reqs in pyproject.toml and mne at least more consistent with mne[full] as well:

https://github.com/conda-forge/mne-feedstock/blob/ac4cd905e3e5ac5e667fd707dfff498a60ade511/recipe/meta.yaml#L27-L112

Originally posted by @larsoner in #12903 (comment)

[larsoner]

Just to add I don't think we need to hit 100% synchronization between mne[full] and the mne recipe, but we should at least know what the differences are. Since we don't want to fetch the recipe on every commit, a pre-commit hook is probably not the best candidate here. Instead a unit test could be used, or our style CI runs could have a new "consistency" entry or something.

[drammock]

some WIP code for this, not really far enough along to open a PR yet but at least here's a start:

from collections import defaultdict
from urllib.request import urlopen

import yaml

content= urlopen(
    "https://raw.githubusercontent.com/conda-forge/mne-feedstock/main/recipe/meta.yaml"
).read().decode("utf-8").split("\n")

# file contains Jinja stuff that chokes the YAML parser, so just pull out what we need
depth = 0
output = defaultdict(list)
for line in content:
    line = line.strip()
    if line.startswith("- name: mne-installer-menus"):
        break
    if line.startswith("test:"):
        depth = 1
    if line.startswith("- name:"):
        key = line.split(": ")[1]
    for level in ("outputs", "requirements", "run"):
        if line.startswith(f"{level}:"):
            depth += 1
    if depth == 3 and "{{ pin_subpackage" not in line:
        output[key].append(line)
# TODO: meaningful comments aren't parsed, so lines like
# - pyqt  # [build_variant == "pyqt"]
# - pyside6  # [build_variant == "pyside6"]
# aren't handled well

deps_mne_base = yaml.safe_load("\n".join(output["mne-base"]))["run"]
deps_mne = yaml.safe_load("\n".join(output["mne"]))["run"]