Can the null-ls formatter be configured to automatically format only new code, and leave existing code alone?

• black

  322 37,425 9.4 Python

  The uncompromising Python code formatter

  

When submitting PR's for my team to code review, I want to make sure my code is properly formatted using the Black formatter for Python.

• lsp-format-modifications.nvim

  4 130 5.1 Lua

  LSP formatting, but only on modified text regions.

I’ve been using the plugin lsp-format-modifications to format only modified text regions. Haven’t tried it with Python black though so would be worth testing it out yourself :)) There’s a note at the bottom of the README about how to set it up with null-ls :)

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• darker

  8 612 9.3 Python

  Apply black reformatting to Python files only in regions changed since a given commit. For a practical usage example, see the blog post at https://dev.to/akaihola/improving-python-code-incrementally-3f7a

Not an answer to your question but in the specific case of black you can instead use: https://github.com/akaihola/darker

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