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Hi! My first time adding a formatter, please let me know if I missed
anything.
Some things I'm unclear about:
1. How to fail gracefully when [styleR](https://styler.r-lib.org/)
package is absent from the system
2. Whether the formatter should be named `ess-r` or something more
general like `rlang`
## Test case
FYI, there are loads of tests to pick from on
https://github.com/r-lib/styler/tree/main/tests/testthat.
I picked
[unindention/mixed-in.R](https://github.com/r-lib/styler/blob/main/tests/testthat/unindention/mixed-in.R),
but oddly, the output
[unindention/mixed-out.R](https://github.com/r-lib/styler/blob/main/tests/testthat/unindention/mixed-out.R)
isn't quite the same as we got!
I don't know if that's an upstream issue, or that upstream changed style
since that test was written, or that perhaps the file is meant to be
concatenated into something else.
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