Run powerline-lint from powerline_troubleshoot function

powerline/bindings/vim/plugin/powerline.vim

@@ -71,8 +71,10 @@ try
 	call s:rcmd("		sys.path.append(powerline_appended_path)")
 	call s:rcmd("		".s:import_cmd."")
 	call s:rcmd("	import vim")
-	call s:rcmd("	VimPowerline().setup(pyeval=vim.eval('s:pyeval'), pycmd=vim.eval('s:pycmd'), can_replace_pyeval=int(vim.eval('s:can_replace_pyeval')))")
+	call s:rcmd("	powerline_instance = VimPowerline()")
+	call s:rcmd("	powerline_instance.setup(pyeval=vim.eval('s:pyeval'), pycmd=vim.eval('s:pycmd'), can_replace_pyeval=int(vim.eval('s:can_replace_pyeval')))")
 	call s:rcmd("	del VimPowerline")
+	call s:rcmd("	del powerline_instance")
 	call s:rcmd("except Exception:")
 	call s:rcmd("	import traceback, sys")
 	call s:rcmd("	traceback.print_exc(file=sys.stdout)")
@@ -135,6 +137,19 @@ finally
 		call s:rcmd("				print('one in ' + real_powerline_dir + ', other in ' + real_this_dir + '.')")
 		call s:rcmd("				print('You should remove one of this. Check out troubleshooting section,')")
 		call s:rcmd("				print('it contains some information about the alternatives.')")
+		call s:rcmd("		try:")
+		call s:rcmd("			from powerline.lint import check")
+		call s:rcmd("		except ImportError:")
+		call s:rcmd("			print('Failed to import powerline.lint.check, cannot run powerline-lint')")
+		call s:rcmd("		else:")
+		call s:rcmd("			try:")
+		call s:rcmd("				paths = powerline_instance.get_config_paths()")
+		call s:rcmd("			except NameError:")
+		call s:rcmd("				pass")
+		call s:rcmd("			else:")
+		call s:rcmd("				from powerline.lint.markedjson.error import echoerr")
+		call s:rcmd("				ee = lambda *args, **kwargs: echoerr(*args, stream=sys.stdout, **kwargs)")
+		call s:rcmd("				check(paths=paths, echoerr=ee, require_ext='vim')")
 		call s:rcmd("try:")
 		call s:rcmd("	powerline_troubleshoot()")
 		call s:rcmd("finally:")

powerline/lint/__init__.py

@@ -383,6 +383,10 @@ class Spec(object):
 		self.isoptional = True
 		return self
 
+	def required(self):
+		self.isoptional = False
+		return self
+
 	def match_checks(self, *args):
 		hadproblem = False
 		for check in self.checks:
@@ -451,6 +455,12 @@ class Spec(object):
 								        problem_mark=key.mark)
 		return True, hadproblem
 
+	def __getitem__(self, key):
+		return self.specs[self.keys[key]]
+
+	def __setitem__(self, key, value):
+		return self.update(**{key : value})
+
 
 class WithPath(object):
 	def __init__(self, import_paths):
@@ -1465,7 +1475,7 @@ def generate_json_config_loader(lhadproblem):
 	return load_json_config
 
 
-def check(paths=None, debug=False, echoerr=echoerr):
+def check(paths=None, debug=False, echoerr=echoerr, require_ext=None):
 	search_paths = paths or get_config_paths()
 	find_config_files = generate_config_finder(lambda: search_paths)
 
@@ -1475,6 +1485,15 @@ def check(paths=None, debug=False, echoerr=echoerr):
 
 	ee = EchoErr(echoerr, logger)
 
+	if require_ext:
+		used_main_spec = main_spec.copy()
+		try:
+			used_main_spec['ext'][require_ext].required()
+		except KeyError:
+			used_main_spec['ext'][require_ext] = ext_spec()
+	else:
+		used_main_spec = main_spec
+
 	lhadproblem = [False]
 	load_json_config = generate_json_config_loader(lhadproblem)
 
@@ -1553,7 +1572,7 @@ def check(paths=None, debug=False, echoerr=echoerr):
 		ee(problem=str(e))
 		hadproblem = True
 	else:
-		if main_spec.match(
+		if used_main_spec.match(
 			main_config,
 			data={'configs': configs, 'lists': lists},
 			context=init_context(main_config),

powerline/lint/markedjson/error.py

@@ -68,8 +68,9 @@ class Mark:
 
 
 def echoerr(*args, **kwargs):
-	sys.stderr.write('\n')
-	sys.stderr.write(format_error(*args, **kwargs) + '\n')
+	stream = kwargs.pop('stream', sys.stderr)
+	stream.write('\n')
+	stream.write(format_error(*args, **kwargs) + '\n')
 
 
 def format_error(context=None, context_mark=None, problem=None, problem_mark=None, note=None):