Detect unsupported tools in projects

[ofalvai]

Context

Detect unsupported tools/frameworks/platforms in the project directory to log them later.

Changes

• Create scanner/unknown.go for everything related to scanning the repo for unsupported but recognized tools. This is not a scanner though, because it needs to run only after all other platform scanners fail.
• A common interface for the various tool detectors and 3 actual implementations:
  • singleFileToolDetector that looks for only a single file name
  • multiFileToolDetector that first looks for a primary file name, but can also find one of the optional files as a fallback
  • kotlinMultiplatformDetector because there is no distinct file name pattern for KMM, so it also looks at the file contents of certain files 🤷
• While traversing the folders recursively, the detectors also build a string representation of the file tree for logging purposes. Similar to the tree command, but a bit simpler.

Decisions

• Maximum scan depth is 3
• A list of excluded directories is defined in code

Out of scope for this PR

• Wiring this into the project scanner flow
• Logging of results

[tothszabi]

Bazel is missing from the list.

[ofalvai]

Fixed!

[tothszabi]

The singleFileToolDetector and multiFileToolDetector implementations are too similar to each other which made me think we could unify them. Like a singleFileToolDetector can be represented with a multiFileToolDetector with a single required item and an empty optional items list.

And if we do that then we can drop the first part of its name and just keep toolDetector.

[ofalvai]

That's a good idea actually!

[ofalvai]

@tothszabi is this the correct folder name for iOS frameworks? I couldn't find any good info about this one folder name.

[tothszabi]

Good that you asked this question because I have missed this. At the moment we use .framework and I think we should use that instead of Framework.

bitrise-init/vendor/github.com/bitrise-io/go-xcode/pathfilters/pathfilters.go

Line 19 in d213de3

frameworkExt = ".framework"

Have look if you could reuse these existing filters.