Better error messages on error

[tunetheweb]

Brief summary of the change made

Follow on from #1385

Following changes:

• The current error is not highlighted in red so is a bit lost.
• Also we only show the error when in verbose mode which I think in hindsight is not great.
• Should use stderr so anyone using output from stdout can continue to
• Explain how to override

Are there any other side effects of this change that we should be aware of?

Nope.

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/parser (note YML files can be auto generated with python test/generate_parse_fixture_yml.py or by running tox locally).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #1407 (1f78300) into main (178e2a1) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #1407   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          127       127           
  Lines         8553      8550    -3     
=========================================
- Hits          8553      8550    -3     

Impacted Files	Coverage Δ
src/sqlfluff/cli/commands.py	100.00% <100.00%> (ø)
src/sqlfluff/rules/L010.py	100.00% <100.00%> (ø)

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[nolanbconaway]

Ah yeah good call