fix: strip trailing newlines from show line output

[w3lld1]

Summary

Fixes #454 by normalizing gto show single-line outputs so tag/ref/version values that already contain trailing CR/LF characters do not produce an extra blank line in CLI output.

Changes

• Strip trailing \r/\n from values emitted through format_echo(..., \"line\") and format_echo(..., \"lines\").
• Keep Click's normal single terminating newline for terminal-friendly output.
• Add a regression test covering gto show --ref and gto show --version when returned values contain trailing newlines.

Verification

• pytest tests/test_cli.py::test_show_line_flags_strip_value_newlines tests/test_cli.py::test_commands tests/test_cli.py::test_show_ref_flag_not_applicable -q
• pytest -q
  • 189 passed, 1 warning
• python -m py_compile gto/*.py
• git diff --check

[Copilot]

Pull request overview

This PR fixes an output-normalization issue in the CLI where gto show single-line outputs could contain an extra blank line when the underlying value already ended with \r/\n, by stripping trailing newline characters before emitting via Click.

Changes:

• Add a small helper to strip trailing \r/\n from values printed via format_echo(..., "line") and format_echo(..., "lines").
• Update format_echo to use the normalization helper for the line/lines formats.
• Add a regression test covering gto show --ref and gto show --version when returned values include trailing CR/LF.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
gto/utils.py	Normalizes line/lines output by stripping trailing CR/LF before click.echo, preventing extra blank lines.
tests/test_cli.py	Adds regression coverage ensuring gto show --ref/--version emits exactly one trailing newline even if values contain CR/LF.

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[shcheklein]

@w3lld1 please TAL / resolve and fix. Thanks for the contribution.

[w3lld1]

Rebased this onto current main, resolved the conflict with the adjacent show-version test, and fixed the ruff-format failure. Local validation now passes: python -m pytest tests/test_cli.py::test_show_line_flag_empty_result tests/test_cli.py::test_show_line_flags_strip_value_newlines -q and pre-commit run --all-files.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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