allow streaming formatting
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C-feature-request
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Description
Feature Request
Summary
Allow streaming formatting
Motivation
Windows process startup time is 30ms. Therefore, a function call to format rust code using rustfmt will take at least 30ms on windows. If streaming was allowing using start and end markers, then it would be possible to build a rustfmt process pool that could format rust code without the 30ms startup overhead.
I don't think this would add much maintenance burden, because this would just call format_string internally.
Related configuration options
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