Hi I recently heard of this project and it looks really cool

Question

Hi I recently heard of this project and it looks really cool A while ago I wrote <https github com Starlight220 ActionsKtLib> a small library for writing Docker based GH Actions in Kotlin I think there might be room for some integrations or something and I m open to cooperation

Piotr Krzemiński · Answer

Hi looks really cool Just a few days ago I created my first GH action indeed in Kotlin and Docker based <https github com krzema12 github actions typing|https github com krzema12 github actions typing> The action has just one input but if it ever grows I ll consider using your library

Piotr Krzemiński · Answer

BTW if you own some action I saw at least one maybe you could consider introducing typing for your action s API See the README in and let me know how it looks As maintainers of the Kotlin GH workflows DSL we would really love if each action owner would maintain the typings themselves You can help us start this movement

Piotr Krzemiński · Answer

If be happy to use your library as well for the sake of just trying it out and sharing feedback

Starr · Answer

thanks and I d be happy to get some feedback The lib started from a Action I wrote I saw that I had a lot of boilerplate for interacting with inputs outputs etc so I decided to split it out

Starr · Answer

the aforementioned action will probably need some cleanup and polishing before being transferred to a org so I ll try to add the typing spec then when I get to it I ll share any feedback I have

Piotr Krzemiński · Answer

Regarding inputs reading did you consider returning `null` or some other value instead of throwing an exception if a given input is not set I prefer such exceptionless APIs for the sake of FP approach sometimes for performance I suggest having two variants in the library like Kotlin s stdlib does sometimes

Starr · Answer

I also prefer FP but I didn t think of it at the time Now that you mention it it s a great idea only that delegates aren t very friendly to nullable or `Result` types I think I ll migrate the low level function to return `null` or add an ` OrNull` variant and pull the exception up to the delegate syntax sugar

Starr · Answer

Opened <https github com Starlight220 ActionsKtLib issues 2> for this

Piotr Krzemiński · Answer

gt only that delegates aren t very friendly to nullable or `Result` types gt See e g <https ajalt github io clikt |https ajalt github io clikt > this library allows reading a CLI option that s optional then the delegate s returned type is nullable Unless I don t understand the problem

Vampire · Answer

gt indeed in Kotlin and Docker based May I ask why you did it Docker based They are slower than JavaScript based and are only running on Linux runners and only if Docker is installed while the JavaScript actions should run on any valid runner And thanks to Kotlin JS you can still write them in Kotlin unless you need some JVM only dependencies <https github com Vampire setup wsl> is an example of how to do it

Starr · Answer

I considered using Kotlin JS and there s a library for that I linked to it in the comparison section of the README but the original action I wrote used was a lot of regexes and file io and I was more comfortable knowledgable with the JVM APIs for that stuff

Piotr Krzemiński · Answer

I also started my action as a Node based with Kotlin JS but the multiplatform YAML library i tried wasn t mature enough and lacked key features Then I switched to JVM

Starr · Answer

And isnt there an action or something to setup docker on any platform

Vampire · Answer

Even if there is wouldn t change a thing GitHub Actions defines that docker actions are only usable on Linux runners with docker installed So even if you have a custom mac or windows runner with docker installed it will not work

Starr · Answer

Source

Vampire · Answer

GitHub documentation as of 45 minutes ago

Vampire · Answer

gt Type | Operating system gt Docker container | Linux gt JavaScript | Linux macOS Windows gt Composite Actions | Linux macOS Windows and gt Docker container actions can only execute on runners with a Linux operating system Self hosted runners must use a Linux operating system and have Docker installed to run Docker container actions gt Self hosted runners must use a Linux operating system and have Docker installed to run Docker container actions

Starr · Answer

I see