[swift-dev] Support for per-project code styles in SourceKit

[Jordan Rose]

+swift-build-dev, since this affects the recommended structure of Swift projects and thus Swift packages.

Jordan

> On Jan 17, 2017, at 09:25, Daniel Martín via swift-dev <swift-dev at swift.org> wrote:
> 
> Hi, all:
> 
> I've been planning the implementation of per-project code style support for Swift. Hopefully, if implemented correctly, this tweet would not be true anymore: https://twitter.com/CodaFi_/status/821142027077238784
> 
> As I understand it, right now we have two possible kind of clients for formatting Swift code (both are exercising code inside the swiftIDE library):
> 
> - Xcode: IDELanguageSupportUI, which is a plugin installed by default with Xcode, is responsible for sending a message to SourceKit with the "format.usetabs", "format.indentwidth", "format.tabwidth" parameters, among others. SwiftIDE simply formats the region and updates the buffer. I suppose other third party editors also use this mechanism.
> 
> - Swift-format: This little internal tool only uses a single function from Formatting.cpp, passing the desired format options as a parameter.
> 
> In order to support different code styles per project, we need to make, at least, the following changes:
> 
> - Create some factory methods for the CodeFormatOptions struct, one for each supported style (initially, only "Default", or "Apple", ie. no tabs, 4 spaces, no case label indentation in switch statements).
> 
> - Add support for reading an optional .swift-format file inside the current directory. This file would be a simple YAML file with key-value pairs like this:
> 
> ---- .swift-format ----
> 
> Style: Apple
> 
> IndentWidth: 2
> 
> Does it make sense? I'll try to maintain the same SourceKit interface so that Xcode and other editors don't break and at the same time it's easy for them to opt-in this feature.
> 
> Opinions?
> 
> Thanks,
> 
> Daniel Martín
> 
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