WIP: Implement Add Command

[0101coding]

Hi @cnpryer This is another Draft PR for review. What do you think is remaining

[cnpryer]

Looking good. A couple comments we can address. Then it's up to you how much more you want to do. I'm okay merging this incomplete if you want. I can finish the rest if it's easier.

The toml serialization should be simple. It'll change after #197 though. we also dont have --dev implemented. A test in huak::ops::add for add_project_dependency would be good too.

Lmk what you think.

[cnpryer]

I'll checkout add_project_dependency, but can we use the same signature (or roughly) that we use for ops::remove::remove_project_dependency?

[cnpryer]

so

Suggested change

	add_project_dependency(dependency.unwrap().to_string(), false)?;
	if let Err(e) = ops::add_project_dependency(&project, dependency) {
	return Err(CliError::new(e, ExitCode::FAILURE));
	}

[cnpryer]

Suggested change

	pub fn add_project_dependency(package: String, _is_dev: bool) -> CliResult<()> {
	let path = format!("https://pypi.org/pypi/{}/json", package);
	let resp = reqwest::blocking::get(path)?;
	let json: PyPi = resp.json()?;
	// Get the version
	let version = json.info.version;
	let name = json.info.name;
	let dep = PythonPackage::new(name.as_str(), None, Some(version.as_str()));
	// dep.name = name;
	// dep.version = version;
	let venv = Venv::default();
	venv.install_package(&dep)?;
	Ok(())
	}
	pub fn add_project_dependency(project: &Project, dependency: &str, _is_dev: bool) -> Result<(), HuakError> {
	let url = format!("https://pypi.org/pypi/{}/json", dependency);
	let res = match reqwest::blocking::get(url) {
	Ok(it) => it,
	Err(e) => return Err(HuakError::AnyhowError(anyhow::format_err!(e))),
	};
	let json: PyPi = match res.json() {
	Ok(it) => it,
	Err(e) => return Err(HuakError::AnyhowError(anyhow::format_err!(e))),
	};
	// Get the version
	let version = json.info.version;
	let name = json.info.name;
	let package = PythonPackage::new(name.as_str(), None, Some(version.as_str()));
	match project.venv() {
	Some(v) => v.install_package(package),
	_ => return Err(HuakError::VenvNotFound),
	}
	// Remaining code to add to project's toml and serialize to pyproject.toml
	// ...
	Ok(())
	}

Would be super cool to add HuakError::PyPIError if that makes sense.

[cnpryer]

I'll close this out in favor of #227