There is a little bug with

local_store_dir

is

v1.24.0.dev2

. when setting the local_store in pants.ini, it should be set without the ' ', because otherwise, it creates a folder with ' in the name, example:

[GLOBAL]
pants_version: 1.24.0.dev2
print_exception_stacktrace: True
pants_bootstrapdir: '.cache/pants'
pants_configdir: '.cache/pants/config'
local_store_dir: '.cache/pants/config/lmdb_store'

will create a folder named

'.cache

with subsequent subfolders

local_store_dir: .cache/pants/config/lmdb_store

fixes the issue

That’s a quirk of ini files :/ generally, you don’t escape string values in quotes if it’s just one entry like these are But, if you have a list of strings, then you do use quotes

ah that would be really cool

Would you find value in pyproject.toml in particular, as opposed to a dedicated pants.toml? (Although presumably we could keep supporting multiple config files - this is for what the default would be)

what would be the difference between

pants.toml

and

pyproject.toml

?

pants.toml

can't be used with other tools that support toml config files for example ?

Mainly that

pyproject.toml

requires prefixing everything with

tool.pants

. So you would have

tool.pants.python-setup

and

tool.pants.flake8

sections, rather than

python-setup

and

flake8

sections That doesn’t seem ideal to me, but it also allows devs to have only one config file for everything in the python ecosystem, which many people want

I guess as pants is language-agnostic having pants.toml as default is better, But still if just for the python ecosystem I prefer keeping the pyproject.toml (it's long overdue for the python ecosystem to converge 😅). mypy, flake8, black, isort and coverage already support/use pyproject.toml so maybe instead of having

tool.pants.flake8

, pants can use directly the config in

tool.flake8

?

Huh, that’s an interesting thought to have Pants try to parse

pyproject.toml

to derive Pants values like

--flake8-config

. Likely out of scope for now and not enough of the ecosystem supports

pyproject.toml

yet (Flake8 and MyPy don’t), but interesting thought. I think I agree on

pants.toml

. Notably, Pants can be used without ever once having Python in your monorepo. It’s only an implementation detail that we use Python to run it all

The future looks bright then 😁 : MyPy: https://github.com/python/mypy/pull/5208 Pytest: https://github.com/pytest-dev/pytest/issues/1556#issuecomment-572267167 Flake8: https://gitlab.com/pycqa/flake8/merge_requests/245 (a bit old)

Yes but those PRs are pretty old 😕 I think MyPy recently agreed to land it after some rebases and cleanup, at least! FYI see PEP 518 for why they chose TOML rather than YAML, JSON, or sticking with INI: https://www.python.org/dev/peps/pep-0518/#specification