Improve ignored files support in filebrowser

[sheezaaziz]

Fixes #984

[github-actions]

👈 Launch a binder notebook on branch sheezaaziz/jupyterlab-git/984.v2

[fcollonval]

What you would like to do is to execute the git check-ignore command in the repository to know if it is ignored or not. Something like this should do:

Suggested change

	def check_ignore(self, path):
	# in git.py Git, add a new method check_ignore that execute git check-ignore -z <path> and parse the result to return the list of ignored files; changed_files method is a good example of a similar method.
	return
	def check_ignore(self, repository_path, path):
	"""
	Check if a path is ignored or not.
	Args:
	repository_path: Path to the Git repository
	path: Relative path to check
	"""
	# in git.py Git, add a new method check_ignore that execute git check-ignore -z <path> and parse the result to return the list of ignored files; changed_files method is a good example of a similar method.
	cmd = ["git", "check-ignore", "-z", path]
	response = {}
	try:
	code, output, error = await execute(cmd, cwd=repository_path)
	except subprocess.CalledProcessError as e:
	response["code"] = e.returncode
	response["message"] = e.output.decode("utf-8")
	else:
	response["code"] = code
	if code != 0:
	response["command"] = " ".join(cmd)
	response["message"] = error
	else:
	response["files"] = strip_and_split(output)
	return response

[fcollonval]

Here you want this method to be executed on an GET request. So the method should be named get. Then you will obtain the repository path as path input argument and you could for example get the relative path to check through a query argument like this:

Suggested change

	def check_ignore(self, path):
	self.git.check_ignore(self, path)
	async def get(self, path):
	path_to_check = self.get_query_argument("path", "")
	body = await self.git.check_ignore(self, self.url2localpath(path), path_to_check)
	if body["code"] != 0:
	self.set_status(500)
	self.finish(json.dumps(body))

[fcollonval]

Then to call the backend with the proper argument, you will need something like that

Suggested change

	get isIgnored(): Git.IBranch {
	return;
	}
	async isIgnored(pathToCheck: string): Promise<{files: string[]}> {
	const path = await this._getPathRepository();
	return requestAPI<{files: string[]}>(
	URLExt.join(path, 'ignore') + URLExt.objectToQueryString({path: pathToCheck}),
	'GET'
	);
	}