Ignore commands in quotes

[pietroalbini]

There is another edge case in homu command handling: when an user replies to a comment via email by default the parent command is quoted, and the old parser code tried to handle it. We should ignore commands when the line starts with >, to hopefully catch quoted emails, or if the new parser already handles this a test should be added.

Example: rust-lang/rust#61540 (comment)

[bryanburgers]

This is a good first issue for somebody new to Homu.

A little guidance for somebody taking this task:

• Create a test similar to

  homu/homu/tests/test_parse_issue_comment.py

  Lines 87 to 97 in abd0083

  	def test_r_me():
  	"""
  	Ignore r=me
  	"""
  	author = "jack"
  	body = "@bors r=me"
  	commands = parse_issue_comment(author, body, commit, "bors")
  	# r=me is not a valid command, so no valid commands.
  	assert len(commands) == 0

  that sets the body variable to a comment you might expect – one that includes a > @bors valid command. Probably assert that len(commands) == 0?
• Observe that the test fails when you run python3 setup.py test.
• Update

  homu/homu/parse_issue_comment.py

  Line 139 in abd0083

  def parse_issue_comment(username, body, sha, botname, hooks=[]):

  to pass the test.