setup.cfg: entry_points keys are made lowercase

This breaks when the entry point is actually case-sensitive.

1. git clone https://github.com/pydoit/doit-plugin-sample
2. Delete setup.py, use the following setup.cfg:

[metadata]
name = doit-plugin-sample
description = a simple doit command plugin

[options]
py_modules = 
    doit_sample_cmd
install_requires = 
    doit

[options.entry_points]
doit.COMMAND =
    plug_sample = doit_sample_cmd:SampleCmd

1. Use this pyproject.toml:

[build-system]
requires = ["setuptools>=30.3.0", "wheel"]

1. pip install . inside a venv.

Inspecting venv/*/site-packages/doit_plugin_sample-0.0.0.dist-info/entry_points.txt:

[doit.command]
plug_sample = doit_sample_cmd:SampleCmd

This will not work, as the entry point is doit.COMMAND.

[jaraco]

I created the repro as jaraco/doit-plugin-sample@setuptools/1937.

draft $ git clone gh://pydoit/doit-plugin-sample
Cloning into 'doit-plugin-sample'...
remote: Enumerating objects: 7, done.
remote: Counting objects: 100% (7/7), done.
remote: Compressing objects: 100% (6/6), done.
remote: Total 7 (delta 1), reused 7 (delta 1), pack-reused 0
Receiving objects: 100% (7/7), done.
Resolving deltas: 100% (1/1), done.
draft $ cd doit-plugin-sample/
doit-plugin-sample master $ hub fork
Updating jaraco
From https://github.com/pydoit/doit-plugin-sample
 * [new branch]      master     -> jaraco/master
new remote: jaraco
doit-plugin-sample master $ git checkout -b setuptools/1937
Switched to a new branch 'setuptools/1937'
doit-plugin-sample setuptools/1937 $ git rm setup.py
rm 'setup.py'
doit-plugin-sample setuptools/1937 $ cat > setup.cfg
[metadata]
name = doit-plugin-sample
description = a simple doit command plugin

[options]
py_modules = 
    doit_sample_cmd
install_requires = 
    doit

[options.entry_points]
doit.COMMAND =
    plug_sample = doit_sample_cmd:SampleCmd
doit-plugin-sample setuptools/1937 $ cat > pyproject.toml
[build-system]
requires = ["setuptools>=30.3.0", "wheel"]
doit-plugin-sample setuptools/1937 $ git add .
doit-plugin-sample setuptools/1937 $ git commit -a -m "Alter project as described in pypa/setuptools#1937"
[setuptools/1937 6a47e86] Alter project as described in pypa/setuptools#1937
 2 files changed, 15 insertions(+), 17 deletions(-)
 create mode 100644 pyproject.toml
 rewrite setup.py (99%)
 mode change 100755 => 100644
doit-plugin-sample setuptools/1937 $ git push jaraco
Enumerating objects: 6, done.
Counting objects: 100% (6/6), done.
Delta compression using up to 8 threads
Compressing objects: 100% (4/4), done.
Writing objects: 100% (4/4), 605 bytes | 605.00 KiB/s, done.
Total 4 (delta 0), reused 0 (delta 0), pack-reused 0
remote: 
remote: Create a pull request for 'setuptools/1937' on GitHub by visiting:
remote:      https://github.com/jaraco/doit-plugin-sample/pull/new/setuptools/1937
remote: 
To github.com:jaraco/doit-plugin-sample.git
 * [new branch]      setuptools/1937 -> setuptools/1937

With that, I’m able to demonstrate how the doit plugin works when running under the HEAD of the repo (7f56bc5):

draft $ touch dodo.py
draft $ pip-run -q --use-pep517 doit git+https://github.com/pydoit/doit-plugin-sample@7f56bc5 setuptools -- -m doit plug_sample
  WARNING: Did not find branch or tag '7f56bc5', assuming revision or ref.
This sample command does nothing!

And fails when running under the fork version:

draft $ pip-run -q --use-pep517 doit git+https://github.com/jaraco/doit-plugin-sample@setuptools/1937 setuptools -- -m doit plug_sample
ERROR: Invalid parameter: "plug_sample". Must be a command, task, or a target.
Type "-m help" to see available commands.
Type "-m list" to see available tasks.

[melissa-kun-li]

I’ll take this on 😃