Jextract CLI doesn't have a way to pass .swiftinterface files

[abdulowork]

The jextract CLI doesn't allow passing .swiftinterface files. I built the CLI with swift build --product swift-java, produced the .swiftinterface with:

xcodebuild clean build -workspace Samples/SwiftJavaExtractFFMSampleApp/ -scheme SwiftJavaExtractFFMSampleApp -destination generic/platform=macOS -derivedDataPath dd SWIFT_EMIT_MODULE_INTERFACE=YES ARCHS=arm64

And tried importing it with:

./.build/arm64-apple-macosx/debug/swift-java jextract --swift-module MySwiftLibrary --input-swift dd/Build/Products/Debug/MySwiftLibrary.swiftmodule/arm64-apple-macos.swiftinterface --java-package com.example.swift --output-swift S1 --output-java J1

This capability seems to be intended from the sources. With a minor tweak here, I was able to get jextract to accept the .swiftinterface file, and it produced a Java API similar to the API it makes from sources.

[ktoso]

We originally were driving everything from interfaces and then moved to swift files, but yes, it is intended to allow either!

Would you want to submit your small tweak

swift-java/Sources/JExtractSwiftLib/Swift2Java.swift

Line 52 in 2534f41

let allFiles = collectAllFiles(suffix: ".swift", in: inputPaths, log: translator.log)

here as a PR please? We can also add some test-case for this in Samples probably ... best discussed in a PR and I can help out finish it up