Add basic CLI

[schultyy]

This PR ships with a basic implementation of a CLI for parcel-css using clap-rs.

Resolves #36

[height]

Link Height tasks by mentioning a task ID in the pull request title or commit messages, or description and comments with the keyword link (e.g. "Link T-123").

💡Tip: You can also use "Close T-X" to automatically close a task when the pull request is merged.

[devongovett]

Hey, thanks for starting this! I'll try it out tomorrow. 😄

[joelmoss]

Would be awesome if the CLI could (optionally) return the output to stdout instead of writing to a file :)

[schultyy]

Done!

[devongovett]

Thanks! Nice work. Looks like it will be pretty easy to add more features on top of it too!

[schultyy]

Yay! Thanks! Happy I could contribute!

[joelmoss]

Apologies for my lack of Rust knowledge, but how would I actually use this CLI?

[devongovett]

We still need to figure out a nicer distribution method once we have a few more features (#52), but for now you can install with cargo:

cargo install parcel_css --version 1.0.0-alpha.12

And that gives you a global parcel_css binary.

[joelmoss]

Is the resulting binary platform dependent? As in, it is compiled for the platform/OS you run that command on?

[rrcobb]

Is the resulting binary platform dependent? As in, it is compiled for the platform/OS you run that command on?

It should be platform independent, so long as you have the appropriate local rust setup, via rustup! If you cargo install something, it should always be fit to your platform. See more on the install command's page in the The Cargo Book.

[mischnic]

As in, it is compiled for the platform/OS you run that command on?

It is compiled on the machine you run the command on. So in that sense:

Is the resulting binary platform dependent

no. But it will run on your machine