Improve the behavior of --dir and --file

[kylekthompson]

With the upcoming release of Embedded Runs, we need to better define the behavior around --dir and --file.

Previously, these flags were mutually exclusive. You could provide:

• Nothing. In this case, we'd look in .mint in your working directory and try to run any task definitions at the top-level of that folder
• --dir some-dir. In this case, we'd look in that directory for run definitions and try to run them
• --file some-file.yml. In this case, we'd ignore any .mint directories and simply send the one task definition you specified

Moving forward, embedded runs need the context of a .mint dir to populate the run definitions that can be statically embedded (via call: ${{ mint.run-dir }}/tasks.yml). To facilitate this, the CLI needs to differentiate between the task definitions that we intend to run and the ones which should be treated as the mint dir for a run.

Now, you can provide:

• Nothing. In this case, we'll start in the working directory and traverse up until we find a .mint dir no no .mint dir
• --dir some-dir --file somewhere-else/tasks.yml. In this case, the contents of some-dir can be referenced by static embedded runs and somewhere-else/tasks.yml will be the definition we use to start your run
• --dir some-dir. In this case, we'll read the contents of some-dir, use it as the mint dir for embedded runs and try to start runs with the definitions in the directory
• --file somewhere-else/tasks.yml. In this case, we'll perform the traversal logic to populate the mint dir and use somewhere-else/tasks.yml to start your run

[ayazhafiz]

Unfortunate that Go stdlib doesn't expose a "root of filesystem" function (1)

[kylekthompson]

Yea, I think there are other parts of this that aren't very Windows friendly anyway that we need to tackle 😐 specifically, Mint does pretty much exclusively unix path manipulation, but much of the code in here uses things like filepath.Join which are OS-specific (so windows would send up windows path separators even though Mint wants unix)