Context-aware range formatting

[syml]

Does rust support context-aware range formatting? From the command-line help it seems it's not the case.
If not can we have that as a feature?

[nrc]

Could you give an example of the kind of thing you want?

[syml]

foo.rs:
struct Foo { bar: i32
}
struct Bar { baz: bool }

command:
cat foo.rs | rustfmt --lines=4-4

output:
struct Foo { bar: i32
}
struct Bar {
baz: bool
}

The idea is to be able to selectively format some lines. Most formatters support that, ex: clang-format.

[kamalmarhubi]

See #434. I'm working on it at the moment.