Insert __copyright_year into cookiecutter.json

[seanh]

This is needed to prevent the cookiecutter from updating the copyright year in the LICENSE file to the current year every new year. See: hypothesis/cookiecutters#105

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I automated the creation of these PRs using Commando. I first created a script at /tmp/insert_copyright_year.py that, when run in the root directory of a project, inserts __copyright_year into the project's cookiecutter.json file:

#!/usr/bin/env python
import json

settings = json.loads(open(".cookiecutter/cookiecutter.json", "r").read())
settings["extra_context"]["__copyright_year"] = "2022"
open(".cookiecutter/cookiecutter.json", "w").write(json.dumps(settings, indent=2))

I then ran Commando like this to create the PRs:

$ commando \
  --repos $(gh api -X GET search/repositories --paginate -f 'q=cookiecutter.json in:readme org:hypothesis archived:false' -q '.items | .[] | .full_name' | xargs) \
  --command /tmp/insert_copyright_year.py \
  --branch insert-copyright-year \
  --commit-message-file /tmp/commit_message.txt \
  --pr-title 'Insert `__copyright_year` into `cookiecutter.json`' \
  --pr-body-file /tmp/pr_body.md

Rather than typing out the long gh api command you can instead just call the bin/find_repos script from the cookiecutter repo, assuming you want to send PRs to all cookiecuttered projects: commando --repos $(bin/find_repos) --command ...

You can also run the same command on just one repo first in order to test it before sending loads of PRs. Just run commando --repos hypothesis/tox-envfile --command ....

Unfortunately there may be some incidental reformatting of cookiecutter.json (with no functional effect) due to rewriting the previously hand-edited file from Python.