feat: allow multiple --author flags in poetry init

[ddarji1409]

Summary

Closes #8864.

poetry init --author previously accepted only a single value. This change allows the flag to be passed multiple times:

poetry init --author "Alice <alice@example.com>" --author "Bob <bob@example.com>"

Changes

src/poetry/console/commands/init.py

• Added multiple=True to the --author option definition (consistent with how --dependency and --dev-dependency are declared)
• Updated author processing logic: if any --author flags are provided, they're used directly as the authors list, skipping the interactive prompt
• Existing behavior preserved: when no --author flags are given, falls back to git config and interactive prompt as before

Test plan

• test_validate_author — passes
• test_noninteractive — passes (exercises --author flag, now correctly handles tuple)
• Single --author flag still works (backwards compatible)
• Multiple --author flags now accepted

🤖 Generated with Claude Code

Summary by Sourcery

New Features:

• Support multiple --author flags for poetry init to define an explicit list of authors non-interactively.

[sourcery-ai]

Reviewer's Guide

Adds support for specifying multiple --author flags in poetry init and adjusts author collection logic to prefer CLI-provided authors while preserving existing interactive and VCS-based behavior when no authors are passed.

Flow diagram for updated author resolution in poetry init

flowchart TD
  Start["Start _init_pyproject"] --> GetOption["Get author options as list: authors_from_option = list(option(author))"]
  GetOption --> HasCLIAuthors{Any CLI authors?}
  HasCLIAuthors -- Yes --> UseCLIAuthors["Set authors = authors_from_option"]
  UseCLIAuthors --> End["Continue with pyproject initialization"]

  HasCLIAuthors -- No --> InitAuthorVar["Set author = None"]
  InitAuthorVar --> HasVCSName{vcs_config has user.name?}

  HasVCSName -- Yes --> BuildAuthorName["Set author = vcs_config[user.name]"]
  BuildAuthorName --> HasVCSEmail{vcs_config has user.email?}
  HasVCSEmail -- Yes --> AppendEmail["Append <user.email> to author"]
  HasVCSEmail -- No --> SkipEmail["Keep author without email"]
  AppendEmail --> CheckInteractive
  SkipEmail --> CheckInteractive

  HasVCSName -- No --> CheckInteractive

  CheckInteractive{is_interactive?} -- Yes --> AskQuestion["Ask interactive author question with default = author"]
  AskQuestion --> ValidateAuthor["Validate answer with _validate_author"]
  ValidateAuthor --> SetAuthorFromAnswer["Set author to validated answer"]
  SetAuthorFromAnswer --> BuildAuthorsList

  CheckInteractive -- No --> BuildAuthorsList

  BuildAuthorsList["Set authors = [author] if author else []"] --> End

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File-Level Changes

Change	Details	Files
Allow multiple --author flags and treat them as the authoritative authors list when provided.	Updated the InitCommand options to declare the author option with multiple=True, aligning it with dependency options that accept multiple values. Changed author resolution to first collect all --author flag values into a list and, when present, use them directly as the authors list without prompting interactively. Retained the previous flow for deriving a default author from VCS config and prompting the user only when no --author flags are given, then wrapping the final author (if any) into an authors list.	src/poetry/console/commands/init.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8864	Enable specifying multiple authors for poetry init non-interactively (e.g., via CLI options such as --author).	✅
#8864	Update documentation to describe how to specify multiple authors when running poetry init.	❌	The PR only changes the command implementation in init.py and does not include any documentation updates explaining the new multiple --author usage.

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