Make periphery return non-zero exit code on warnings

[Jeehut]

I'd like to configure Periphery on our CI and configured everything like this (see our template project):

project: NewProjectTemplate.xcodeproj
schemes: [App]
targets: [App, Tests, UITests]
report_exclude:
  - App/Generated/SwiftGen/*.swift
  - App/SupportingFiles/*.swift
retain_public: false
quiet: true

But when I run periphery scan on the CI the builds always succeed even when I willingly add some unused code to test if the CI is failing. This is due to there being no option to make periphery return with a non-zero exit code for warnings (I don't know if it even returns with 0 on errors) – but for our purpose it would be grate to have an option like fail_on_warnings or -f or -w when calling the executable so this works.

[Jeehut]

I just posted a PR with a basic implementation for this. Feel free to give feedback.

[Jeehut]

I just removed the original periphery on my device

brew remove periphery -f

and installed my fork using Mint (can take a while)

mint install Dschee/periphery@fail-on-warnings

and tested my implementation adding this to the configuration file

fail_on_warnings: true

and it worked just as expected! 🎉

[ileitch]

I don't know if it even returns with 0 on errors

It returns 1 for errors, Commandant handles that.

[Jeehut]

Implemented via #23.