Experiment adding codestarts to an exisiting project

[ia3andy]

Description
Following a discussion with @aloubyansky, we defined a few rules which could make it work:

• only declared compatible example codestarts (the simplest without config) could be added to an existing project
• include only the src directory and filter out files which need to be merged (config, index.html), all other sources and resources are fine..
• adding dependencies would be delegated to the parent api

Implementation ideas

1. Modify the void CodestartProjectGeneration.generateProject(final CodestartProjectDefinition projectDefinition, final Path targetDirectory) to return a result with info about the generated project (including the shared-data which contains dependencies and shared-dependencies.
2. When adding an extension to an existing project, we need to:
   • detect the "core" codestarts that it uses (buildtool, language, config, tooling)
   • detect the root package name (or use the groupId)
   • detect which added extensions contains example codestarts compatible for addition
   • generate full project
   • keep only the src dir and remove the src/main/resources/META-INF/resources/index.html and src/main/resources/application.*
   • apply them to the existing project (and log what's been added)
   • use the existing tooling to add the dependencies and test dependencies given by the result (without re-calling all this obviously)

/cc @quarkusio/devtools

[maxandersen]

sounds sensible - how would we mark a codestart as being "incremental" ? a tag/label in the yaml or ?

[maxandersen]

btw. I assume you would also keep additional resources, like html, templates, etc. not just .java, .kt, .scale...

[ia3andy]

sounds sensible - how would we mark a codestart as being "incremental" ? a tag/label in the yaml or ?

Yep

btw. I assume you would also keep additional resources, like html, templates, etc. not just .java, .kt, .scale...

yes, you are right, I forgot about those.. we need to include everything in the src directly which don't need to be merged (config, index.html), all other resources, templates, html are fine

[ia3andy]

@geoandri if you are looking for some real challenge now :-)? This one is tough!

[geoandri]

I am not really familiar with the internals of the codestarts, but I can dig into it and give it a try.

[ia3andy]

@geoandri up to you, there are plenty of stuff to work on ;-)