[Notes] [Git][BuildStream/buildstream][tristan/notifications] _frontend/linuxapp.py: Fix special casing around desktop notification escape sequence

[Tristan Van Berkom <gitlab mg gitlab com>]

Title: GitLab

Tristan Van Berkom pushed to branch tristan/notifications at BuildStream / buildstream

Commits:

• aa9f8eb9
  by Tristan Van Berkom at 2018-08-21T13:44:09Z

  _frontend/linuxapp.py: Fix special casing around desktop notification escape sequence
  
  Now we allow the notification to happen on any TERM
  which starts with 'xterm' or 'vte', and we only do it
  if the VTE_VERSION is >= 4600, where we know for sure that
  VTE will not print garbage on the terminal.
  
  Fixes #385
  

1 changed file:

• buildstream/_frontend/linuxapp.py

Changes:

buildstream/_frontend/linuxapp.py

---

...	...	@@ -22,12 +22,43 @@ import click
22	22	from .app import App
23	23
24	24
	25	+# This trick is currently only supported on some terminals,
	26	+# avoid using it where it can cause garbage to be printed
	27	+# to the terminal.
	28	+#
	29	+def _osc_777_supported():
	30	+
	31	+ term = os.environ['TERM']
	32	+
	33	+ if term.startswith('xterm') or term.startswith('vte'):
	34	+
	35	+ # Since vte version 4600, upstream silently ignores
	36	+ # the OSC 777 without printing garbage to the terminal.
	37	+ #
	38	+ # For distros like Fedora who have patched vte, this
	39	+ # will trigger a desktop notification and bring attention
	40	+ # to the terminal.
	41	+ #
	42	+ vte_version = os.environ['VTE_VERSION']
	43	+ try:
	44	+ vte_version_int = int(vte_version)
	45	+ except ValueError:
	46	+ return False
	47	+
	48	+ if vte_version_int >= 4600:
	49	+ return True
	50	+
	51	+ return False
	52	+
	53	+
25	54	# A linux specific App implementation
26	55	#
27	56	class LinuxApp(App):
28	57
29	58	def notify(self, title, text):
30	59
31		- term = os.environ['TERM']
32		- if term in ('xterm', 'vte'):
33		- click.echo("\033]777;notify;{};{}\007".format(title, text))
	60	+ # Currently we only try this notification method
	61	+ # of sending an escape sequence to the terminal
	62	+ #
	63	+ if _osc_777_supported():
	64	+ click.echo("\033]777;notify;{};{}\007".format(title, text), err=True)

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