v6.0.0

[yajo]

All changes here.
Summary:

Added

• Allow using additional Jinja 2 extensions.
• Major version mismatch warning. If your Copier version is too new, you'll be warned.
• Specific exceptions, which will help on error detection for API usages.
• Multiline questions.
• Conditional questions.
• Placeholders.
• Interactive TUI for questionaries. Prompts are way cooler now. 😎
• Python 3.9 support.
• Python 3.10 support.
• Support empty templates suffix, telling Copier to render every file.
• Added --defaults flag to use default answers to questions, which might be null if
  not specified.
• Added --overwrite flag to overwrite files that already exist, without asking.
• In migration scripts, we have the new environment variables $VERSION_PEP440_FROM,
  $VERSION_PEP440_CURRENT and $VERSION_PEP440_TO, which will always get a valid
  PEP440 version identifier, without the v prefix, allowing your migration scripts
  to have a valid standard where to base their logic.
• Raise a CopierAnswersInterrupt instead of a bare KeyboardInterrupt to provide
  callers with additional context - such as the partially completed AnswersMap.
• Support for user_defaults, which take precedence over template defaults.
• Copy dirty changes from a git-tracked template to the project by default, to make
  testing easier.
• Advertise clearly which version is being copied or updated in the CLI.
• Add jinja variable _copier_python to provide python sys.executable.

Changed

• Fully refactored core.
• Running copier copy on a preexisting project now recopies the project instead of
  updating it. That means that it respects old answers, but ignores history diff.
• We use Jinja 2 defaults now. {{ }} instead of [[ ]] and similar.
• We keep trailing newlines by default for Jinja 2 templates.
• Copier will never ask for overwriting the answers file.
• Multi-typed choices follow the same type-casting logic as any other question, so
  it's easier to reason about them. However, if you were using this feature, you might
  be surprised about its side effects if you don't specify the type explicitly. Just
  add type: yaml to make it behave mostly as before. Or just don't use that, it's
  complicated anyway (warn added to docs).
• Changed --force to be the same as --defaults --overwrite.
• Copied files will reflect permissions on the same files in the template.
• Copier now uses git clone --filter=blob:none when cloning, to be faster.
• Removing files from templates will remove them too from the subprojects when they
  get updated.

Deprecated

• Deprecated now and make_secret functions. If your template used those, Copier
  will emit warnings leading you on how to upgrade it.
• Templates marked with _min_copier_version below 6 will still default to use
  bracket-based Jinja defaults, but that will disappear soon. If you want your
  template to work on Copier 5 and 6, make sure to declare _envops explicitly in
  your copier.yaml.
• copier.copy() is confusing, now that actually copying and updating are 2
  completely different actions (before, you were actually always updating if
  possible). Its direct equivalent is now copier.run_auto(), and copier.copy()
  will disappear in the future.

Removed

• Minimal supported Python version is now 3.7 (dropped Python 3.6 support).
• Removed the json method on _copier_conf. Where you would previously use
  _copier_conf.json() in your templates, please now use _copier_conf|to_json
  instead.
• --subdirectory flag, which was confusing... and probably useless.
• Lots of dead code.

Fixed

• A directory that gets an empty name works as expected: not copied (nor its
  contents).
• When comparing versions to update, PEP 440 is always used now. This way, we avoid
  fake ordering when git commit descriptions happen to be ordered in a non-predictable
  way.
• Answers file will only remember answers to questions specified in the questionary.

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This discussion was created from the release v6.0.0.