Improve terminal.py:

1. Make it print true color escape sequences when debugging.
2. Add support for automatic row detection.

tests/modules/lib/terminal.py

@@ -111,21 +111,33 @@ class ExpectProcess(threading.Thread):
 		with self.child_lock:
 			self.child.send(data)
 
-	def get_highlighted_text(self, text, attrs, default_props=()):
+	def get_highlighted_text(self, text, attrs, default_props=(),
+	                         use_escapes=False):
 		ret = []
 		new_attrs = attrs.copy()
 		for cell_properties, segment_text in text:
-			segment_text = segment_text.translate({'{': '{{', '}': '}}'})
-			if cell_properties not in new_attrs:
-				new_attrs[cell_properties] = len(new_attrs) + 1
-			props_name = new_attrs[cell_properties]
-			if props_name in default_props:
-				ret.append(segment_text)
+			if use_escapes:
+				escapes = ('\033[38;2;{0};{1};{2};48;2;{3};{4};{5}'.format(
+					*(cell_properties[0] + cell_properties[1]))) + (
+						';1' if cell_properties[2] else ''
+					) + (
+						';3' if cell_properties[3] else ''
+					) + (
+						';4' if cell_properties[4] else ''
+					) + 'm'
+				ret.append(escapes + segment_text + '\033[0m')
 			else:
-				ret.append('{' + str(props_name) + ':' + segment_text + '}')
+				segment_text = segment_text.translate({'{': '{{', '}': '}}'})
+				if cell_properties not in new_attrs:
+					new_attrs[cell_properties] = len(new_attrs) + 1
+				props_name = new_attrs[cell_properties]
+				if props_name in default_props:
+					ret.append(segment_text)
+				else:
+					ret.append('{' + str(props_name) + ':' + segment_text + '}')
 		return ''.join(ret), new_attrs
 
-	def get_row(self, row, attrs, default_props=()):
+	def get_row(self, row, attrs, default_props=(), use_escapes=False):
 		with self.lock:
 			return self.get_highlighted_text((
 				(key, ''.join((cell.text for cell in subline)))
@@ -133,34 +145,48 @@ class ExpectProcess(threading.Thread):
 					self.vterm.vtscreen[row, col]
 					for col in range(self.dim.cols)
 				), lambda cell: cell.cell_properties_key)
-			), attrs, default_props)
+			), attrs, default_props, use_escapes)
 
-	def get_screen(self, attrs, default_props=()):
+	def get_screen(self, attrs, default_props=(), use_escapes=False):
 		lines = []
 		for row in range(self.dim.rows):
-			line, attrs = self.get_row(row, attrs, default_props)
+			line, attrs = self.get_row(row, attrs, default_props, use_escapes)
 			lines.append(line)
 		return '\n'.join(lines), attrs
 
 
 def test_expected_result(p, test, last_attempt, last_attempt_cb, attempts):
+	debugging_tests = not not os.environ.get('_POWERLINE_DEBUGGING_TESTS')
 	expected_text, attrs = test['expected_result']
 	result = None
 	while attempts:
-		actual_text, all_attrs = p.get_row(test['row'], attrs)
+		if 'row' in test:
+			row = test['row']
+		else:
+			row = p.dim.rows - 1
+			while row >= 0 and not p[row, 0].text:
+				row -= 1
+			if row < 0:
+				row = 0
+		actual_text, all_attrs = p.get_row(row, attrs)
 		if actual_text == expected_text:
 			return True
 		attempts -= 1
-		print('Actual result does not match expected. Attempts left: {0}.'.format(attempts))
+		print('Actual result does not match expected for row {0}. Attempts left: {1}.'.format(
+			row, attempts))
 		sleep(2)
-	print('Result:')
+	print('Result (row {0}):'.format(row))
 	print(actual_text)
 	print('Expected:')
 	print(expected_text)
 	print('Attributes:')
-	print(all_attrs)
+	for v, k in sorted(
+		((v, k) for k, v in all_attrs.items()),
+		key=(lambda t: '%02u'.format(t[0]) if isinstance(t[0], int) else t[0]),
+	):
+		print('{k!r}: {v!r},'.format(v=v, k=k))
 	print('Screen:')
-	screen, screen_attrs = p.get_screen(attrs)
+	screen, screen_attrs = p.get_screen(attrs, use_escapes=debugging_tests)
 	print(screen)
 	print(screen_attrs)
 	print('_' * 80)
@@ -223,7 +249,7 @@ def get_env(vterm_path, test_dir, *args, **kwargs):
 def do_terminal_tests(tests, cmd, dim, args, env, suite, cwd=None, fin_cb=None,
                       last_attempt_cb=None, attempts=None):
 	debugging_tests = not not os.environ.get('_POWERLINE_DEBUGGING_TESTS')
-	default_attempts = 1 if debugging_tests else 3
+	default_attempts = 2 if debugging_tests else 3
 	if attempts is None:
 		attempts = default_attempts
 	lib = os.environ.get('POWERLINE_LIBVTERM')