[feature] Improve task inheritance merging for globally scoped tasks

[sybernatus]

Hello 🙂

Is your feature request related to a problem? Please describe.

Kind of...
I'm using moon to manage a lot of projects in a monorepo (100+) and differents technologies:

• kustomize (kubectl)
• nodejs
• ansible
• bash
• markdown
• etc.

Each project has a main technology but not only one.
For example, I have a main kustomize project (let's call it my-project for the example) but also containing some bash scripts & some markdown documents.

My first idea is that I'd like to write tests for each technologies & just setup the moon.yml depending on the technology.
For example with my-project:

• a global test for all kustomize projects
• a global test for all projects containing bash
• a global test for all projects containing markdown

Example of test I'd like to turn in global tasks:

• kustomize: test that the yaml is built correctly with kubectl kustomize base
• bash: test that all dependencies are resolved
• markdown: test that all local links are resolved

Problem is that there is only a shallow merged between global tasks and If I want a moon project to inherit the 3 tests, I have to create a tag- for each combinations.

Describe the solution you'd like

What I would like to do is define my 3 global tasks (from tags or languages), for example:

.moon/tasks/kustomize.yml

tasks:
  test:
    deps:
      - 'test.kustomize'
  test.kustomize:
    command:
      - "<my kustomize test>"

.moon/tasks/tag-bash.yml

tasks:
  test:
    deps:
      - 'test.bash'
  test.bash:
    command:
      - "<my bash test>"

.moon/tasks/tag-markdown.yml

tasks:
  test:
    deps:
      - 'test.markdown'
  test.markdown:
    command:
      - "<my markdown test>"

And as a result of all of this, I'd like to have a merge of the deps of my task test.
Giving this final template:

tasks:
  test:
    deps:
      - 'test.kustomize'
      - 'test.bash'
      - 'test.markdown'
  test.kustomize:
    command:
      - "<my kustomize test>"
  test.bash:
    command:
      - "<my bash test>"
  test.markdown:
    command:
      - "<my markdown test>"

Maybe by managing the merge option in the .moon/workspace.yml like:

globalTasks:
  options:
    merge: append

Describe alternatives you've considered

Today the only solutions I have found are to:

• create one tag by project pattern based on their technology list
  • In that case, each tag containing a technology will have the same deplicated test
• override at moon.yml level by
  • creating only the tasks test.<specific-test> in each tag- files
  • add all the tags in each moon.yml projects
  • create the task test on each moon.yml even if I have the same 100 times

Additional context

I have a lot of projects with different pattern and many more coming, I'd like to avoid duplicating this in every of them.

[milesj]

I do have plans to support deep merging but it is kind of a breaking change, so probably won't land until v2.