Support pylama for python (#2266)

* Add pylama for python
* Consolidate python traceback handling

test/command_callback/test_pylama_command_callback.vader

@@ -0,0 +1,85 @@
+Before:
+  call ale#assert#SetUpLinterTest('python', 'pylama')
+  call ale#test#SetFilename('test.py')
+
+  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'
+  let b:command_tail = ' %t'
+
+After:
+  unlet! b:bin_dir
+  unlet! b:executable
+  unlet! b:command_tail
+
+  call ale#assert#TearDownLinterTest()
+
+Execute(The pylama command callback should return a default):
+  AssertLinter 'pylama',
+  \ ale#path#BufferCdString(bufnr(''))
+  \   . ale#Escape('pylama') . b:command_tail
+
+Execute(The option for disabling changing directories should work):
+  let g:ale_python_pylama_change_directory = 0
+
+  AssertLinter 'pylama', ale#Escape('pylama') . b:command_tail
+
+Execute(The pylama executable should be configurable, and escaped properly):
+  let g:ale_python_pylama_executable = 'executable with spaces'
+
+  AssertLinter 'executable with spaces',
+  \ ale#path#BufferCdString(bufnr(''))
+  \   . ale#Escape('executable with spaces') . b:command_tail
+
+Execute(The pylama command callback should let you set options):
+  let g:ale_python_pylama_options = '--some-option'
+
+  AssertLinter 'pylama',
+  \ ale#path#BufferCdString(bufnr(''))
+  \   . ale#Escape('pylama') . ' --some-option' . b:command_tail
+
+Execute(The pylama command callback should switch directories to the detected project root):
+  silent execute 'file ' . fnameescape(g:dir . '/python_paths/no_virtualenv/subdir/foo/bar.py')
+
+  AssertLinter 'pylama',
+  \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/no_virtualenv/subdir'))
+  \   . ale#Escape('pylama') . b:command_tail
+
+Execute(The pylama command callback shouldn't detect virtualenv directories where they don't exist):
+  silent execute 'file ' . fnameescape(g:dir . '/python_paths/no_virtualenv/subdir/foo/bar.py')
+
+  AssertLinter 'pylama',
+  \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/no_virtualenv/subdir'))
+  \   . ale#Escape('pylama') . b:command_tail
+
+Execute(The pylama command callback should detect virtualenv directories and switch to the project root):
+  silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
+
+  let b:executable = ale#path#Simplify(
+  \ g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/pylama'
+  \)
+
+  AssertLinter b:executable,
+  \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/subdir'))
+  \   . ale#Escape(b:executable) . b:command_tail
+
+Execute(You should able able to use the global pylama instead):
+  silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
+  let g:ale_python_pylama_use_global = 1
+
+  AssertLinter 'pylama',
+  \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/subdir'))
+  \   . ale#Escape('pylama') . b:command_tail
+
+Execute(Setting executable to 'pipenv' appends 'run pylama'):
+  let g:ale_python_pylama_executable = 'path/to/pipenv'
+
+  AssertLinter 'path/to/pipenv',
+  \ ale#path#BufferCdString(bufnr(''))
+  \   . ale#Escape('path/to/pipenv') . ' run pylama' . b:command_tail
+
+Execute(Pipenv is detected when python_pylama_auto_pipenv is set):
+  let g:ale_python_pylama_auto_pipenv = 1
+  call ale#test#SetFilename('/testplugin/test/python_fixtures/pipenv/whatever.py')
+
+  AssertLinter 'pipenv',
+  \ ale#path#BufferCdString(bufnr(''))
+  \   . ale#Escape('pipenv') . ' run pylama' . b:command_tail

test/handler/test_flake8_handler.vader

@@ -113,7 +113,7 @@ Execute(The flake8 handler should handle stack traces):
   \ [
   \   {
   \     'lnum': 1,
-  \     'text': 'An exception was thrown. See :ALEDetail',
+  \     'text': 'ImportError: No module named parser (See :ALEDetail)',
   \     'detail': join([
   \       'Traceback (most recent call last):',
   \       '  File "/usr/local/bin/flake8", line 7, in <module>',

test/handler/test_pylama_handler.vader

@@ -0,0 +1,212 @@
+Before:
+  Save g:ale_warn_about_trailing_whitespace
+
+  let g:ale_warn_about_trailing_whitespace = 1
+
+  runtime ale_linters/python/pylama.vim
+
+After:
+  Restore
+
+  call ale#linter#Reset()
+
+  silent file something_else.py
+
+Execute(The pylama handler should handle no messages):
+  AssertEqual [], ale_linters#python#pylama#Handle(bufnr(''), [])
+
+Execute(The pylama handler should handle basic warnings and syntax errors):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 8,
+  \     'col': 1,
+  \     'code': 'W0611',
+  \     'type': 'W',
+  \     'sub_type': '',
+  \     'text': '''foo'' imported but unused [pyflakes]',
+  \   },
+  \   {
+  \     'lnum': 8,
+  \     'col': 0,
+  \     'code': 'E0401',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'Unable to import ''foo'' [pylint]',
+  \   },
+  \   {
+  \     'lnum': 10,
+  \     'col': 1,
+  \     'code': 'E302',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'expected 2 blank lines, found 1 [pycodestyle]',
+  \   },
+  \   {
+  \     'lnum': 11,
+  \     'col': 1,
+  \     'code': 'D401',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'First line should be in imperative mood (''Get'', not ''Gets'') [pydocstyle]',
+  \   },
+  \   {
+  \     'lnum': 15,
+  \     'col': 81,
+  \     'code': 'E501',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'line too long (96 > 80 characters) [pycodestyle]',
+  \   },
+  \   {
+  \     'lnum': 16,
+  \     'col': 1,
+  \     'code': 'D203',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': '1 blank line required before class docstring (found 0) [pydocstyle]',
+  \   },
+  \   {
+  \     'lnum': 18,
+  \     'col': 1,
+  \     'code': 'D107',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'Missing docstring in __init__ [pydocstyle]',
+  \   },
+  \   {
+  \     'lnum': 20,
+  \     'col': 0,
+  \     'code': 'C4001',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'Invalid string quote ", should be '' [pylint]',
+  \   },
+  \ ],
+  \ ale_linters#python#pylama#Handle(bufnr(''), [
+  \   'No config file found, using default configuration',
+  \   'index.py:8:1: W0611 ''foo'' imported but unused [pyflakes]',
+  \   'index.py:8:0: E0401 Unable to import ''foo'' [pylint]',
+  \   'index.py:10:1: E302 expected 2 blank lines, found 1 [pycodestyle]',
+  \   'index.py:11:1: D401 First line should be in imperative mood (''Get'', not ''Gets'') [pydocstyle]',
+  \   'index.py:15:81: E501 line too long (96 > 80 characters) [pycodestyle]',
+  \   'index.py:16:1: D203 1 blank line required before class docstring (found 0) [pydocstyle]',
+  \   'index.py:18:1: D107 Missing docstring in __init__ [pydocstyle]',
+  \   'index.py:20:0: C4001 Invalid string quote ", should be '' [pylint]',
+  \ ])
+
+Execute(The pylama handler should handle tracebacks with parsable messages):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 1,
+  \     'text': 'ParseError: Cannot parse file. (See :ALEDetail)',
+  \     'detail': join([
+  \       'Traceback (most recent call last):',
+  \       '  File "/usr/local/lib/python2.7/site-packages/pylama/core.py", line 66, in run',
+  \       '    path, code=code, ignore=ignore, select=select, params=lparams)',
+  \       '  File "/usr/local/lib/python2.7/site-packages/pylama/lint/pylama_pydocstyle.py", line 37, in run',
+  \       '    } for e in PyDocChecker().check_source(*check_source_args)]',
+  \       '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/checker.py", line 64, in check_source',
+  \       '    module = parse(StringIO(source), filename)',
+  \       '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/parser.py", line 340, in __call__',
+  \       '    return self.parse(*args, **kwargs)',
+  \       '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/parser.py", line 328, in parse',
+  \       '    six.raise_from(ParseError(), error)',
+  \       '  File "/usr/local/lib/python2.7/site-packages/six.py", line 737, in raise_from',
+  \       '    raise value',
+  \       'ParseError: Cannot parse file.',
+  \     ], "\n"),
+  \   },
+  \   {
+  \     'lnum': 11,
+  \     'col': 1,
+  \     'code': 'E302',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'expected 2 blank lines, found 1 [pycodestyle]',
+  \   },
+  \   {
+  \     'lnum': 16,
+  \     'col': 81,
+  \     'code': 'E501',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'line too long (96 > 80 characters) [pycodestyle]',
+  \   },
+  \ ],
+  \ ale_linters#python#pylama#Handle(bufnr(''), [
+  \   'Traceback (most recent call last):',
+  \   '  File "/usr/local/lib/python2.7/site-packages/pylama/core.py", line 66, in run',
+  \   '    path, code=code, ignore=ignore, select=select, params=lparams)',
+  \   '  File "/usr/local/lib/python2.7/site-packages/pylama/lint/pylama_pydocstyle.py", line 37, in run',
+  \   '    } for e in PyDocChecker().check_source(*check_source_args)]',
+  \   '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/checker.py", line 64, in check_source',
+  \   '    module = parse(StringIO(source), filename)',
+  \   '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/parser.py", line 340, in __call__',
+  \   '    return self.parse(*args, **kwargs)',
+  \   '  File "/usr/local/lib/python2.7/site-packages/pydocstyle/parser.py", line 328, in parse',
+  \   '    six.raise_from(ParseError(), error)',
+  \   '  File "/usr/local/lib/python2.7/site-packages/six.py", line 737, in raise_from',
+  \   '    raise value',
+  \   'ParseError: Cannot parse file.',
+  \   '',
+  \   'index.py:11:1: E302 expected 2 blank lines, found 1 [pycodestyle]',
+  \   'index.py:16:81: E501 line too long (96 > 80 characters) [pycodestyle]',
+  \ ])
+
+" Note: This is probably a bug, since all pylama plugins produce codes, but
+" should be handled for compatibility.
+" Note: The pylama isort plugin is distributed in the isort package.
+Execute(The pylama handler should handle messages without codes):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 0,
+  \     'col': 0,
+  \     'code': '',
+  \     'type': 'W',
+  \     'sub_type': '',
+  \     'text': 'Incorrectly sorted imports. [isort]'
+  \   },
+  \ ],
+  \ ale_linters#python#pylama#Handle(bufnr(''), [
+  \   'index.py:0:0: Incorrectly sorted imports. [isort]',
+  \ ])
+
+" Note: This is a pylama bug, but should be handled for compatibility.
+" See https://github.com/klen/pylama/pull/146
+Execute(The pylama handler should handle message codes followed by a colon):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 31,
+  \     'col': 1,
+  \     'code': 'E800',
+  \     'type': 'E',
+  \     'sub_type': '',
+  \     'text': 'Found commented out code: # needs_sphinx = ''1.0'' [eradicate]',
+  \   },
+  \ ],
+  \ ale_linters#python#pylama#Handle(bufnr(''), [
+  \   'index.py:31:1: E800: Found commented out code: # needs_sphinx = ''1.0'' [eradicate]',
+  \ ])
+
+" The directory created for %t may not comply with pylint module name config.
+" This should not be reported to users.
+Execute(The pylama handler should ignore C0103 from temp dir, not others):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 29,
+  \     'col': 0,
+  \     'code': 'C0103',
+  \     'type': 'W',
+  \     'sub_type': 'style',
+  \     'text': 'Constant name "badname" doesn''t conform to UPPER_CASE naming style [pylint]',
+  \   },
+  \ ],
+  \ ale_linters#python#pylama#Handle(bufnr(''), [
+  \   '../../../../tmp/vmynR33/456/__init__.py:1:0: C0103 Module name "456" doesn''t conform to snake_case naming style [pylint]',
+  \   '../../../../tmp/vmynR33/456/__init__.py:29:0: C0103 Constant name "badname" doesn''t conform to UPPER_CASE naming style [pylint]',
+  \ ])

test/handler/test_vulture_handler.vader

@@ -70,7 +70,7 @@ Execute(Vulture exception should be handled):
   \ [
   \   {
   \     'lnum': 1,
-  \     'text': 'An exception was thrown. See :ALEDetail',
+  \     'text': 'BaddestException: Everything gone wrong (See :ALEDetail)',
   \     'detail': join([
   \       'Traceback (most recent call last):',
   \       '  File "/usr/lib/python3.6/site-packages/vulture/__init__.py", line 13, in <module>',

test/test_python_traceback.vader

@@ -0,0 +1,79 @@
+Execute(ale#python#HandleTraceback returns empty List for empty lines):
+  AssertEqual
+  \  [],
+  \  ale#python#HandleTraceback([], 10)
+
+Execute(ale#python#HandleTraceback returns traceback, when present):
+  AssertEqual
+  \  [{
+  \    'lnum': 1,
+  \    'text': 'Exception: Example error (See :ALEDetail)',
+  \    'detail': join([
+  \      'Traceback (most recent call last):',
+  \      '  File "./example.py", line 5, in <module>',
+  \      '    raise Exception(''Example message'')',
+  \      'Exception: Example error',
+  \    ], "\n"),
+  \  }],
+  \  ale#python#HandleTraceback([
+  \    'Traceback (most recent call last):',
+  \    '  File "./example.py", line 5, in <module>',
+  \    '    raise Exception(''Example message'')',
+  \    'Exception: Example error',
+  \  ], 1)
+
+" SyntaxError has extra output lines about the source
+Execute(ale#python#HandleTraceback returns SyntaxError traceback):
+  AssertEqual
+  \  [{
+  \    'lnum': 1,
+  \    'text': 'SyntaxError: invalid syntax (See :ALEDetail)',
+  \    'detail': join([
+  \      'Traceback (most recent call last):',
+  \      '  File "<string>", line 1, in <module>',
+  \      '  File "example.py", line 5',
+  \      '    +',
+  \      '    ^',
+  \      'SyntaxError: invalid syntax',
+  \    ], "\n"),
+  \  }],
+  \  ale#python#HandleTraceback([
+  \    'Traceback (most recent call last):',
+  \    '  File "<string>", line 1, in <module>',
+  \    '  File "example.py", line 5',
+  \    '    +',
+  \    '    ^',
+  \    'SyntaxError: invalid syntax',
+  \  ], 1)
+
+Execute(ale#python#HandleTraceback ignores traceback after line limit):
+  AssertEqual
+  \  [],
+  \  ale#python#HandleTraceback([
+  \    '',
+  \    'Traceback (most recent call last):',
+  \    '  File "./example.py", line 5, in <module>',
+  \    '    raise Exception(''Example message'')',
+  \    'Exception: Example error',
+  \  ], 1)
+
+Execute(ale#python#HandleTraceback doesn't include later lines in detail):
+  AssertEqual
+  \  [{
+  \    'lnum': 1,
+  \    'text': 'Exception: Example error (See :ALEDetail)',
+  \    'detail': join([
+  \      'Traceback (most recent call last):',
+  \      '  File "./example.py", line 5, in <module>',
+  \      '    raise Exception(''Example message'')',
+  \      'Exception: Example error',
+  \    ], "\n"),
+  \  }],
+  \  ale#python#HandleTraceback([
+  \    'Traceback (most recent call last):',
+  \    '  File "./example.py", line 5, in <module>',
+  \    '    raise Exception(''Example message'')',
+  \    'Exception: Example error',
+  \    'file:1:2: Style issue',
+  \    'file:3:4: Non-style issue',
+  \  ], 1)