[vim] add pyflakes, a python syntax checker

.vim/ftplugin/python/pyflakes.vim

@@ -0,0 +1,321 @@
+" pyflakes.vim - A script to highlight Python code on the fly with warnings
+" from Pyflakes, a Python lint tool.
+"
+" Place this script and the accompanying pyflakes directory in
+" .vim/ftplugin/python.
+"
+" See README for additional installation and information.
+"
+" Thanks to matlib.vim for ideas/code on interactive linting.
+"
+" Maintainer: Kevin Watters <kevin.watters@gmail.com>
+" Version: 0.1
+
+if exists("b:did_pyflakes_plugin")
+    finish " only load once
+else
+    let b:did_pyflakes_plugin = 1
+endif
+
+if !exists('g:pyflakes_builtins')
+    let g:pyflakes_builtins = []
+endif
+
+if !exists("b:did_python_init")
+    let b:did_python_init = 0
+
+    if !has('python')
+        echoerr "Error: the pyflakes.vim plugin requires Vim to be compiled with +python"
+        finish
+    endif
+
+if !exists('g:pyflakes_use_quickfix')
+    let g:pyflakes_use_quickfix = 1
+endif
+
+
+    python << EOF
+import vim
+import os.path
+import sys
+
+if sys.version_info[:2] < (2, 5):
+    raise AssertionError('Vim must be compiled with Python 2.5 or higher; you have ' + sys.version)
+
+# get the directory this script is in: the pyflakes python module should be installed there.
+scriptdir = os.path.join(os.path.dirname(vim.eval('expand("<sfile>")')), 'pyflakes')
+sys.path.insert(0, scriptdir)
+
+import ast
+from pyflakes import checker, messages
+from operator import attrgetter
+import re
+
+class loc(object):
+    def __init__(self, lineno, col=None):
+        self.lineno = lineno
+        self.col_offset = col
+
+class SyntaxError(messages.Message):
+    message = 'could not compile: %s'
+    def __init__(self, filename, lineno, col, message):
+        messages.Message.__init__(self, filename, loc(lineno, col))
+        self.message_args = (message,)
+
+class blackhole(object):
+    write = flush = lambda *a, **k: None
+
+def check(buffer):
+    filename = buffer.name
+    contents = buffer[:]
+
+    # shebang usually found at the top of the file, followed by source code encoding marker.
+    # assume everything else that follows is encoded in the encoding.
+    encoding_found = False
+    for n, line in enumerate(contents):
+        if n >= 2:
+            break
+        elif re.match(r'#.*coding[:=]\s*([-\w.]+)', line):
+            contents = ['']*(n+1) + contents[n+1:]
+            break
+
+    contents = '\n'.join(contents) + '\n'
+
+    vimenc = vim.eval('&encoding')
+    if vimenc:
+        contents = contents.decode(vimenc)
+
+    builtins = set(['__file__'])
+    try:
+        builtins.update(set(eval(vim.eval('string(g:pyflakes_builtins)'))))
+    except Exception:
+        pass
+
+    try:
+        # TODO: use warnings filters instead of ignoring stderr
+        old_stderr, sys.stderr = sys.stderr, blackhole()
+        try:
+            tree = ast.parse(contents, filename or '<unknown>')
+        finally:
+            sys.stderr = old_stderr
+    except:
+        try:
+            value = sys.exc_info()[1]
+            lineno, offset, line = value[1][1:]
+        except IndexError:
+            lineno, offset, line = 1, 0, ''
+        if line and line.endswith("\n"):
+            line = line[:-1]
+
+        return [SyntaxError(filename, lineno, offset, str(value))]
+    else:
+        # pyflakes looks to _MAGIC_GLOBALS in checker.py to see which
+        # UndefinedNames to ignore
+        old_globals = getattr(checker,' _MAGIC_GLOBALS', [])
+        checker._MAGIC_GLOBALS = set(old_globals) | builtins
+
+        w = checker.Checker(tree, filename)
+
+        checker._MAGIC_GLOBALS = old_globals
+
+        w.messages.sort(key = attrgetter('lineno'))
+        return w.messages
+
+
+def vim_quote(s):
+    return s.replace("'", "''")
+EOF
+    let b:did_python_init = 1
+endif
+
+if !b:did_python_init
+    finish
+endif
+
+au BufLeave <buffer> call s:ClearPyflakes()
+
+au BufEnter <buffer> call s:RunPyflakes()
+au InsertLeave <buffer> call s:RunPyflakes()
+au InsertEnter <buffer> call s:RunPyflakes()
+au BufWritePost <buffer> call s:RunPyflakes()
+
+au CursorHold <buffer> call s:RunPyflakes()
+au CursorHoldI <buffer> call s:RunPyflakes()
+
+au CursorHold <buffer> call s:GetPyflakesMessage()
+au CursorMoved <buffer> call s:GetPyflakesMessage()
+
+if !exists("*s:PyflakesUpdate")
+    function s:PyflakesUpdate()
+        silent call s:RunPyflakes()
+        call s:GetPyflakesMessage()
+    endfunction
+endif
+
+" Call this function in your .vimrc to update PyFlakes
+if !exists(":PyflakesUpdate")
+  command PyflakesUpdate :call s:PyflakesUpdate()
+endif
+
+" Hook common text manipulation commands to update PyFlakes
+"   TODO: is there a more general "text op" autocommand we could register
+"   for here?
+noremap <buffer><silent> dd dd:PyflakesUpdate<CR>
+noremap <buffer><silent> dw dw:PyflakesUpdate<CR>
+noremap <buffer><silent> u u:PyflakesUpdate<CR>
+noremap <buffer><silent> <C-R> <C-R>:PyflakesUpdate<CR>
+
+" WideMsg() prints [long] message up to (&columns-1) length
+" guaranteed without "Press Enter" prompt.
+if !exists("*s:WideMsg")
+    function s:WideMsg(msg)
+        let x=&ruler | let y=&showcmd
+        set noruler noshowcmd
+        redraw
+        echo strpart(a:msg, 0, &columns-1)
+        let &ruler=x | let &showcmd=y
+    endfun
+endif
+
+if !exists("*s:GetQuickFixStackCount")
+    function s:GetQuickFixStackCount()
+        let l:stack_count = 0
+        try
+            silent colder 9
+        catch /E380:/
+        endtry
+
+        try
+            for i in range(9)
+                silent cnewer
+                let l:stack_count = l:stack_count + 1
+            endfor
+        catch /E381:/
+            return l:stack_count
+        endtry
+    endfunction
+endif
+
+if !exists("*s:ActivatePyflakesQuickFixWindow")
+    function s:ActivatePyflakesQuickFixWindow()
+        try
+            silent colder 9 " go to the bottom of quickfix stack
+        catch /E380:/
+        endtry
+
+        if s:pyflakes_qf > 0
+            try
+                exe "silent cnewer " . s:pyflakes_qf
+            catch /E381:/
+                echoerr "Could not activate Pyflakes Quickfix Window."
+            endtry
+        endif
+    endfunction
+endif
+
+if !exists("*s:RunPyflakes")
+    function s:RunPyflakes()
+        highlight link PyFlakes SpellBad
+
+        if exists("b:cleared")
+            if b:cleared == 0
+                silent call s:ClearPyflakes()
+                let b:cleared = 1
+            endif
+        else
+            let b:cleared = 1
+        endif
+        
+        let b:matched = []
+        let b:matchedlines = {}
+
+        let b:qf_list = []
+        let b:qf_window_count = -1
+        
+        python << EOF
+for w in check(vim.current.buffer):
+    vim.command('let s:matchDict = {}')
+    vim.command("let s:matchDict['lineNum'] = " + str(w.lineno))
+    vim.command("let s:matchDict['message'] = '%s'" % vim_quote(w.message % w.message_args))
+    vim.command("let b:matchedlines[" + str(w.lineno) + "] = s:matchDict")
+    
+    vim.command("let l:qf_item = {}")
+    vim.command("let l:qf_item.bufnr = bufnr('%')")
+    vim.command("let l:qf_item.filename = expand('%')")
+    vim.command("let l:qf_item.lnum = %s" % str(w.lineno))
+    vim.command("let l:qf_item.text = '%s'" % vim_quote(w.message % w.message_args))
+    vim.command("let l:qf_item.type = 'E'")
+
+    if getattr(w, 'col', None) is None or isinstance(w, SyntaxError):
+        # without column information, just highlight the whole line
+        # (minus the newline)
+        vim.command(r"let s:mID = matchadd('PyFlakes', '\%" + str(w.lineno) + r"l\n\@!')")
+    else:
+        # with a column number, highlight the first keyword there
+        vim.command(r"let s:mID = matchadd('PyFlakes', '^\%" + str(w.lineno) + r"l\_.\{-}\zs\k\+\k\@!\%>" + str(w.col) + r"c')")
+
+        vim.command("let l:qf_item.vcol = 1")
+        vim.command("let l:qf_item.col = %s" % str(w.col + 1))
+
+    vim.command("call add(b:matched, s:matchDict)")
+    vim.command("call add(b:qf_list, l:qf_item)")
+EOF
+        if g:pyflakes_use_quickfix == 1
+            if exists("s:pyflakes_qf")
+                " if pyflakes quickfix window is already created, reuse it
+                call s:ActivatePyflakesQuickFixWindow()
+                call setqflist(b:qf_list, 'r')
+            else
+                " one pyflakes quickfix window for all buffer
+                call setqflist(b:qf_list, '')
+                let s:pyflakes_qf = s:GetQuickFixStackCount()
+            endif
+        endif
+
+        let b:cleared = 0
+    endfunction
+end
+
+" keep track of whether or not we are showing a message
+let b:showing_message = 0
+
+if !exists("*s:GetPyflakesMessage")
+    function s:GetPyflakesMessage()
+        let s:cursorPos = getpos(".")
+
+        " Bail if RunPyflakes hasn't been called yet.
+        if !exists('b:matchedlines')
+            return
+        endif
+
+        " if there's a message for the line the cursor is currently on, echo
+        " it to the console
+        if has_key(b:matchedlines, s:cursorPos[1])
+            let s:pyflakesMatch = get(b:matchedlines, s:cursorPos[1])
+            call s:WideMsg(s:pyflakesMatch['message'])
+            let b:showing_message = 1
+            return
+        endif
+
+        " otherwise, if we're showing a message, clear it
+        if b:showing_message == 1
+            echo
+            let b:showing_message = 0
+        endif
+    endfunction
+endif
+
+if !exists('*s:ClearPyflakes')
+    function s:ClearPyflakes()
+        let s:matches = getmatches()
+        for s:matchId in s:matches
+            if s:matchId['group'] == 'PyFlakes'
+                call matchdelete(s:matchId['id'])
+            endif
+        endfor
+        let b:matched = []
+        let b:matchedlines = {}
+        let b:cleared = 1
+    endfunction
+endif
+

.vim/ftplugin/python/pyflakes/LICENSE

@@ -0,0 +1,21 @@
+
+Copyright (c) 2005 Divmod, Inc., http://www.divmod.com/
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

.vim/ftplugin/python/pyflakes/NEWS.txt

@@ -0,0 +1,29 @@
+0.4.0 (2009-11-25):
+  - Fix reporting for certain SyntaxErrors which lack line number
+    information.
+  - Check for syntax errors more rigorously.
+  - Support checking names used with the class decorator syntax in versions
+    of Python which have it.
+  - Detect local variables which are bound but never used.
+  - Handle permission errors when trying to read source files.
+  - Handle problems with the encoding of source files.
+  - Support importing dotted names so as not to incorrectly report them as
+    redefined unused names.
+  - Support all forms of the with statement.
+  - Consider static `__all__` definitions and avoid reporting unused names
+    if the names are listed there.
+  - Fix incorrect checking of class names with respect to the names of their
+    bases in the class statement.
+  - Support the `__path__` global in `__init__.py`.
+
+0.3.0 (2009-01-30):
+  - Display more informative SyntaxError messages.
+  - Don't hang flymake with unmatched triple quotes (only report a single
+    line of source for a multiline syntax error).
+  - Recognize __builtins__ as a defined name.
+  - Improve pyflakes support for python versions 2.3-2.5
+  - Support for if-else expressions and with statements.
+  - Warn instead of error on non-existant file paths.
+  - Check for __future__ imports after other statements.
+  - Add reporting for some types of import shadowing.
+  - Improve reporting of unbound locals

.vim/ftplugin/python/pyflakes/bin/pyflakes

@@ -0,0 +1,4 @@
+#!/usr/bin/python
+
+from pyflakes.scripts.pyflakes import main
+main()

.vim/ftplugin/python/pyflakes/pyflakes/__init__.py

@@ -0,0 +1,2 @@
+
+__version__ = '0.4.0'

.vim/ftplugin/python/pyflakes/pyflakes/checker.py

@@ -0,0 +1,625 @@
+# -*- test-case-name: pyflakes -*-
+# (c) 2005-2010 Divmod, Inc.
+# See LICENSE file for details
+
+import __builtin__
+import os.path
+import _ast
+
+from pyflakes import messages
+
+
+# utility function to iterate over an AST node's children, adapted
+# from Python 2.6's standard ast module
+try:
+    import ast
+    iter_child_nodes = ast.iter_child_nodes
+except (ImportError, AttributeError):
+    def iter_child_nodes(node, astcls=_ast.AST):
+        """
+        Yield all direct child nodes of *node*, that is, all fields that are nodes
+        and all items of fields that are lists of nodes.
+        """
+        for name in node._fields:
+            field = getattr(node, name, None)
+            if isinstance(field, astcls):
+                yield field
+            elif isinstance(field, list):
+                for item in field:
+                    yield item
+
+
+class Binding(object):
+    """
+    Represents the binding of a value to a name.
+
+    The checker uses this to keep track of which names have been bound and
+    which names have not. See L{Assignment} for a special type of binding that
+    is checked with stricter rules.
+
+    @ivar used: pair of (L{Scope}, line-number) indicating the scope and
+                line number that this binding was last used
+    """
+
+    def __init__(self, name, source):
+        self.name = name
+        self.source = source
+        self.used = False
+
+
+    def __str__(self):
+        return self.name
+
+
+    def __repr__(self):
+        return '<%s object %r from line %r at 0x%x>' % (self.__class__.__name__,
+                                                        self.name,
+                                                        self.source.lineno,
+                                                        id(self))
+
+
+
+class UnBinding(Binding):
+    '''Created by the 'del' operator.'''
+
+
+
+class Importation(Binding):
+    """
+    A binding created by an import statement.
+
+    @ivar fullName: The complete name given to the import statement,
+        possibly including multiple dotted components.
+    @type fullName: C{str}
+    """
+    def __init__(self, name, source):
+        self.fullName = name
+        name = name.split('.')[0]
+        super(Importation, self).__init__(name, source)
+
+
+
+class Argument(Binding):
+    """
+    Represents binding a name as an argument.
+    """
+
+
+
+class Assignment(Binding):
+    """
+    Represents binding a name with an explicit assignment.
+
+    The checker will raise warnings for any Assignment that isn't used. Also,
+    the checker does not consider assignments in tuple/list unpacking to be
+    Assignments, rather it treats them as simple Bindings.
+    """
+
+
+
+class FunctionDefinition(Binding):
+    pass
+
+
+
+class ExportBinding(Binding):
+    """
+    A binding created by an C{__all__} assignment.  If the names in the list
+    can be determined statically, they will be treated as names for export and
+    additional checking applied to them.
+
+    The only C{__all__} assignment that can be recognized is one which takes
+    the value of a literal list containing literal strings.  For example::
+
+        __all__ = ["foo", "bar"]
+
+    Names which are imported and not otherwise used but appear in the value of
+    C{__all__} will not have an unused import warning reported for them.
+    """
+    def names(self):
+        """
+        Return a list of the names referenced by this binding.
+        """
+        names = []
+        if isinstance(self.source, _ast.List):
+            for node in self.source.elts:
+                if isinstance(node, _ast.Str):
+                    names.append(node.s)
+        return names
+
+
+
+class Scope(dict):
+    importStarred = False       # set to True when import * is found
+
+
+    def __repr__(self):
+        return '<%s at 0x%x %s>' % (self.__class__.__name__, id(self), dict.__repr__(self))
+
+
+    def __init__(self):
+        super(Scope, self).__init__()
+
+
+
+class ClassScope(Scope):
+    pass
+
+
+
+class FunctionScope(Scope):
+    """
+    I represent a name scope for a function.
+
+    @ivar globals: Names declared 'global' in this function.
+    """
+    def __init__(self):
+        super(FunctionScope, self).__init__()
+        self.globals = {}
+
+
+
+class ModuleScope(Scope):
+    pass
+
+
+# Globally defined names which are not attributes of the __builtin__ module.
+_MAGIC_GLOBALS = ['__file__', '__builtins__']
+
+
+
+class Checker(object):
+    """
+    I check the cleanliness and sanity of Python code.
+
+    @ivar _deferredFunctions: Tracking list used by L{deferFunction}.  Elements
+        of the list are two-tuples.  The first element is the callable passed
+        to L{deferFunction}.  The second element is a copy of the scope stack
+        at the time L{deferFunction} was called.
+
+    @ivar _deferredAssignments: Similar to C{_deferredFunctions}, but for
+        callables which are deferred assignment checks.
+    """
+
+    nodeDepth = 0
+    traceTree = False
+
+    def __init__(self, tree, filename='(none)'):
+        self._deferredFunctions = []
+        self._deferredAssignments = []
+        self.dead_scopes = []
+        self.messages = []
+        self.filename = filename
+        self.scopeStack = [ModuleScope()]
+        self.futuresAllowed = True
+        self.handleChildren(tree)
+        self._runDeferred(self._deferredFunctions)
+        # Set _deferredFunctions to None so that deferFunction will fail
+        # noisily if called after we've run through the deferred functions.
+        self._deferredFunctions = None
+        self._runDeferred(self._deferredAssignments)
+        # Set _deferredAssignments to None so that deferAssignment will fail
+        # noisly if called after we've run through the deferred assignments.
+        self._deferredAssignments = None
+        del self.scopeStack[1:]
+        self.popScope()
+        self.check_dead_scopes()
+
+
+    def deferFunction(self, callable):
+        '''
+        Schedule a function handler to be called just before completion.
+
+        This is used for handling function bodies, which must be deferred
+        because code later in the file might modify the global scope. When
+        `callable` is called, the scope at the time this is called will be
+        restored, however it will contain any new bindings added to it.
+        '''
+        self._deferredFunctions.append((callable, self.scopeStack[:]))
+
+
+    def deferAssignment(self, callable):
+        """
+        Schedule an assignment handler to be called just after deferred
+        function handlers.
+        """
+        self._deferredAssignments.append((callable, self.scopeStack[:]))
+
+
+    def _runDeferred(self, deferred):
+        """
+        Run the callables in C{deferred} using their associated scope stack.
+        """
+        for handler, scope in deferred:
+            self.scopeStack = scope
+            handler()
+
+
+    def scope(self):
+        return self.scopeStack[-1]
+    scope = property(scope)
+
+    def popScope(self):
+        self.dead_scopes.append(self.scopeStack.pop())
+
+
+    def check_dead_scopes(self):
+        """
+        Look at scopes which have been fully examined and report names in them
+        which were imported but unused.
+        """
+        for scope in self.dead_scopes:
+            export = isinstance(scope.get('__all__'), ExportBinding)
+            if export:
+                all = scope['__all__'].names()
+                if os.path.split(self.filename)[1] != '__init__.py':
+                    # Look for possible mistakes in the export list
+                    undefined = set(all) - set(scope)
+                    for name in undefined:
+                        self.report(
+                            messages.UndefinedExport,
+                            scope['__all__'].source,
+                            name)
+            else:
+                all = []
+
+            # Look for imported names that aren't used.
+            for importation in scope.itervalues():
+                if isinstance(importation, Importation):
+                    if not importation.used and importation.name not in all:
+                        self.report(
+                            messages.UnusedImport,
+                            importation.source,
+                            importation.name)
+
+
+    def pushFunctionScope(self):
+        self.scopeStack.append(FunctionScope())
+
+    def pushClassScope(self):
+        self.scopeStack.append(ClassScope())
+
+    def report(self, messageClass, *args, **kwargs):
+        self.messages.append(messageClass(self.filename, *args, **kwargs))
+
+    def handleChildren(self, tree):
+        for node in iter_child_nodes(tree):
+            self.handleNode(node, tree)
+
+    def isDocstring(self, node):
+        """
+        Determine if the given node is a docstring, as long as it is at the
+        correct place in the node tree.
+        """
+        return isinstance(node, _ast.Str) or \
+               (isinstance(node, _ast.Expr) and
+                isinstance(node.value, _ast.Str))
+
+    def handleNode(self, node, parent):
+        node.parent = parent
+        if self.traceTree:
+            print '  ' * self.nodeDepth + node.__class__.__name__
+        self.nodeDepth += 1
+        if self.futuresAllowed and not \
+               (isinstance(node, _ast.ImportFrom) or self.isDocstring(node)):
+            self.futuresAllowed = False
+        nodeType = node.__class__.__name__.upper()
+        try:
+            handler = getattr(self, nodeType)
+            handler(node)
+        finally:
+            self.nodeDepth -= 1
+        if self.traceTree:
+            print '  ' * self.nodeDepth + 'end ' + node.__class__.__name__
+
+    def ignore(self, node):
+        pass
+
+    # "stmt" type nodes
+    RETURN = DELETE = PRINT = WHILE = IF = WITH = RAISE = TRYEXCEPT = \
+        TRYFINALLY = ASSERT = EXEC = EXPR = handleChildren
+
+    CONTINUE = BREAK = PASS = ignore
+
+    # "expr" type nodes
+    BOOLOP = BINOP = UNARYOP = IFEXP = DICT = SET = YIELD = COMPARE = \
+    CALL = REPR = ATTRIBUTE = SUBSCRIPT = LIST = TUPLE = handleChildren
+
+    NUM = STR = ELLIPSIS = ignore
+
+    # "slice" type nodes
+    SLICE = EXTSLICE = INDEX = handleChildren
+
+    # expression contexts are node instances too, though being constants
+    LOAD = STORE = DEL = AUGLOAD = AUGSTORE = PARAM = ignore
+
+    # same for operators
+    AND = OR = ADD = SUB = MULT = DIV = MOD = POW = LSHIFT = RSHIFT = \
+    BITOR = BITXOR = BITAND = FLOORDIV = INVERT = NOT = UADD = USUB = \
+    EQ = NOTEQ = LT = LTE = GT = GTE = IS = ISNOT = IN = NOTIN = ignore
+
+    # additional node types
+    COMPREHENSION = EXCEPTHANDLER = KEYWORD = handleChildren
+
+    def addBinding(self, loc, value, reportRedef=True):
+        '''Called when a binding is altered.
+
+        - `loc` is the location (an object with lineno and optionally
+          col_offset attributes) of the statement responsible for the change
+        - `value` is the optional new value, a Binding instance, associated
+          with the binding; if None, the binding is deleted if it exists.
+        - if `reportRedef` is True (default), rebinding while unused will be
+          reported.
+        '''
+        if (isinstance(self.scope.get(value.name), FunctionDefinition)
+                    and isinstance(value, FunctionDefinition)):
+            self.report(messages.RedefinedFunction,
+                        loc, value.name, self.scope[value.name].source)
+
+        if not isinstance(self.scope, ClassScope):
+            for scope in self.scopeStack[::-1]:
+                existing = scope.get(value.name)
+                if (isinstance(existing, Importation)
+                        and not existing.used
+                        and (not isinstance(value, Importation) or value.fullName == existing.fullName)
+                        and reportRedef):
+
+                    self.report(messages.RedefinedWhileUnused,
+                                loc, value.name, scope[value.name].source)
+
+        if isinstance(value, UnBinding):
+            try:
+                del self.scope[value.name]
+            except KeyError:
+                self.report(messages.UndefinedName, loc, value.name)
+        else:
+            self.scope[value.name] = value
+
+    def GLOBAL(self, node):
+        """
+        Keep track of globals declarations.
+        """
+        if isinstance(self.scope, FunctionScope):
+            self.scope.globals.update(dict.fromkeys(node.names))
+
+    def LISTCOMP(self, node):
+        # handle generators before element
+        for gen in node.generators:
+            self.handleNode(gen, node)
+        self.handleNode(node.elt, node)
+
+    GENERATOREXP = SETCOMP = LISTCOMP
+
+    # dictionary comprehensions; introduced in Python 2.7
+    def DICTCOMP(self, node):
+        for gen in node.generators:
+            self.handleNode(gen, node)
+        self.handleNode(node.key, node)
+        self.handleNode(node.value, node)
+
+    def FOR(self, node):
+        """
+        Process bindings for loop variables.
+        """
+        vars = []
+        def collectLoopVars(n):
+            if isinstance(n, _ast.Name):
+                vars.append(n.id)
+            elif isinstance(n, _ast.expr_context):
+                return
+            else:
+                for c in iter_child_nodes(n):
+                    collectLoopVars(c)
+
+        collectLoopVars(node.target)
+        for varn in vars:
+            if (isinstance(self.scope.get(varn), Importation)
+                    # unused ones will get an unused import warning
+                    and self.scope[varn].used):
+                self.report(messages.ImportShadowedByLoopVar,
+                            node, varn, self.scope[varn].source)
+
+        self.handleChildren(node)
+
+    def NAME(self, node):
+        """
+        Handle occurrence of Name (which can be a load/store/delete access.)
+        """
+        # Locate the name in locals / function / globals scopes.
+        if isinstance(node.ctx, (_ast.Load, _ast.AugLoad)):
+            # try local scope
+            importStarred = self.scope.importStarred
+            try:
+                self.scope[node.id].used = (self.scope, node)
+            except KeyError:
+                pass
+            else:
+                return
+
+            # try enclosing function scopes
+
+            for scope in self.scopeStack[-2:0:-1]:
+                importStarred = importStarred or scope.importStarred
+                if not isinstance(scope, FunctionScope):
+                    continue
+                try:
+                    scope[node.id].used = (self.scope, node)
+                except KeyError:
+                    pass
+                else:
+                    return
+
+            # try global scope
+
+            importStarred = importStarred or self.scopeStack[0].importStarred
+            try:
+                self.scopeStack[0][node.id].used = (self.scope, node)
+            except KeyError:
+                if ((not hasattr(__builtin__, node.id))
+                        and node.id not in _MAGIC_GLOBALS
+                        and not importStarred):
+                    if (os.path.basename(self.filename) == '__init__.py' and
+                        node.id == '__path__'):
+                        # the special name __path__ is valid only in packages
+                        pass
+                    else:
+                        self.report(messages.UndefinedName, node, node.id)
+        elif isinstance(node.ctx, (_ast.Store, _ast.AugStore)):
+            # if the name hasn't already been defined in the current scope
+            if isinstance(self.scope, FunctionScope) and node.id not in self.scope:
+                # for each function or module scope above us
+                for scope in self.scopeStack[:-1]:
+                    if not isinstance(scope, (FunctionScope, ModuleScope)):
+                        continue
+                    # if the name was defined in that scope, and the name has
+                    # been accessed already in the current scope, and hasn't
+                    # been declared global
+                    if (node.id in scope
+                            and scope[node.id].used
+                            and scope[node.id].used[0] is self.scope
+                            and node.id not in self.scope.globals):
+                        # then it's probably a mistake
+                        self.report(messages.UndefinedLocal,
+                                    scope[node.id].used[1],
+                                    node.id,
+                                    scope[node.id].source)
+                        break
+
+            if isinstance(node.parent,
+                          (_ast.For, _ast.comprehension, _ast.Tuple, _ast.List)):
+                binding = Binding(node.id, node)
+            elif (node.id == '__all__' and
+                  isinstance(self.scope, ModuleScope)):
+                binding = ExportBinding(node.id, node.parent.value)
+            else:
+                binding = Assignment(node.id, node)
+            if node.id in self.scope:
+                binding.used = self.scope[node.id].used
+            self.addBinding(node, binding)
+        elif isinstance(node.ctx, _ast.Del):
+            if isinstance(self.scope, FunctionScope) and \
+                   node.id in self.scope.globals:
+                del self.scope.globals[node.id]
+            else:
+                self.addBinding(node, UnBinding(node.id, node))
+        else:
+            # must be a Param context -- this only happens for names in function
+            # arguments, but these aren't dispatched through here
+            raise RuntimeError(
+                "Got impossible expression context: %r" % (node.ctx,))
+
+
+    def FUNCTIONDEF(self, node):
+        # the decorators attribute is called decorator_list as of Python 2.6
+        if hasattr(node, 'decorators'):
+            for deco in node.decorators:
+                self.handleNode(deco, node)
+        else:
+            for deco in node.decorator_list:
+                self.handleNode(deco, node)
+        self.addBinding(node, FunctionDefinition(node.name, node))
+        self.LAMBDA(node)
+
+    def LAMBDA(self, node):
+        for default in node.args.defaults:
+            self.handleNode(default, node)
+
+        def runFunction():
+            args = []
+
+            def addArgs(arglist):
+                for arg in arglist:
+                    if isinstance(arg, _ast.Tuple):
+                        addArgs(arg.elts)
+                    else:
+                        if arg.id in args:
+                            self.report(messages.DuplicateArgument,
+                                        node, arg.id)
+                        args.append(arg.id)
+
+            self.pushFunctionScope()
+            addArgs(node.args.args)
+            # vararg/kwarg identifiers are not Name nodes
+            if node.args.vararg:
+                args.append(node.args.vararg)
+            if node.args.kwarg:
+                args.append(node.args.kwarg)
+            for name in args:
+                self.addBinding(node, Argument(name, node), reportRedef=False)
+            if isinstance(node.body, list):
+                # case for FunctionDefs
+                for stmt in node.body:
+                    self.handleNode(stmt, node)
+            else:
+                # case for Lambdas
+                self.handleNode(node.body, node)
+            def checkUnusedAssignments():
+                """
+                Check to see if any assignments have not been used.
+                """
+                for name, binding in self.scope.iteritems():
+                    if (not binding.used and not name in self.scope.globals
+                        and isinstance(binding, Assignment)):
+                        self.report(messages.UnusedVariable,
+                                    binding.source, name)
+            self.deferAssignment(checkUnusedAssignments)
+            self.popScope()
+
+        self.deferFunction(runFunction)
+
+
+    def CLASSDEF(self, node):
+        """
+        Check names used in a class definition, including its decorators, base
+        classes, and the body of its definition.  Additionally, add its name to
+        the current scope.
+        """
+        # decorator_list is present as of Python 2.6
+        for deco in getattr(node, 'decorator_list', []):
+            self.handleNode(deco, node)
+        for baseNode in node.bases:
+            self.handleNode(baseNode, node)
+        self.pushClassScope()
+        for stmt in node.body:
+            self.handleNode(stmt, node)
+        self.popScope()
+        self.addBinding(node, Binding(node.name, node))
+
+    def ASSIGN(self, node):
+        self.handleNode(node.value, node)
+        for target in node.targets:
+            self.handleNode(target, node)
+
+    def AUGASSIGN(self, node):
+        # AugAssign is awkward: must set the context explicitly and visit twice,
+        # once with AugLoad context, once with AugStore context
+        node.target.ctx = _ast.AugLoad()
+        self.handleNode(node.target, node)
+        self.handleNode(node.value, node)
+        node.target.ctx = _ast.AugStore()
+        self.handleNode(node.target, node)
+
+    def IMPORT(self, node):
+        for alias in node.names:
+            name = alias.asname or alias.name
+            importation = Importation(name, node)
+            self.addBinding(node, importation)
+
+    def IMPORTFROM(self, node):
+        if node.module == '__future__':
+            if not self.futuresAllowed:
+                self.report(messages.LateFutureImport, node,
+                            [n.name for n in node.names])
+        else:
+            self.futuresAllowed = False
+
+        for alias in node.names:
+            if alias.name == '*':
+                self.scope.importStarred = True
+                self.report(messages.ImportStarUsed, node, node.module)
+                continue
+            name = alias.asname or alias.name
+            importation = Importation(name, node)
+            if node.module == '__future__':
+                importation.used = (self.scope, node)
+            self.addBinding(node, importation)

.vim/ftplugin/python/pyflakes/pyflakes/messages.py

@@ -0,0 +1,96 @@
+# (c) 2005 Divmod, Inc.  See LICENSE file for details
+
+class Message(object):
+    message = ''
+    message_args = ()
+    def __init__(self, filename, loc, use_column=True):
+        self.filename = filename
+        self.lineno = loc.lineno
+        self.col = getattr(loc, 'col_offset', None) if use_column else None
+
+    def __str__(self):
+        return '%s:%s: %s' % (self.filename, self.lineno, self.message % self.message_args)
+
+
+class UnusedImport(Message):
+    message = '%r imported but unused'
+    def __init__(self, filename, loc, name):
+        Message.__init__(self, filename, loc, use_column=False)
+        self.message_args = (name,)
+
+
+class RedefinedWhileUnused(Message):
+    message = 'redefinition of unused %r from line %r'
+    def __init__(self, filename, loc, name, orig_loc):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name, orig_loc.lineno)
+
+
+class ImportShadowedByLoopVar(Message):
+    message = 'import %r from line %r shadowed by loop variable'
+    def __init__(self, filename, loc, name, orig_loc):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name, orig_loc.lineno)
+
+
+class ImportStarUsed(Message):
+    message = "'from %s import *' used; unable to detect undefined names"
+    def __init__(self, filename, loc, modname):
+        Message.__init__(self, filename, loc)
+        self.message_args = (modname,)
+
+
+class UndefinedName(Message):
+    message = 'undefined name %r'
+    def __init__(self, filename, loc, name):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name,)
+
+
+
+class UndefinedExport(Message):
+    message = 'undefined name %r in __all__'
+    def __init__(self, filename, loc, name):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name,)
+
+
+
+class UndefinedLocal(Message):
+    message = "local variable %r (defined in enclosing scope on line %r) referenced before assignment"
+    def __init__(self, filename, loc, name, orig_loc):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name, orig_loc.lineno)
+
+
+class DuplicateArgument(Message):
+    message = 'duplicate argument %r in function definition'
+    def __init__(self, filename, loc, name):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name,)
+
+
+class RedefinedFunction(Message):
+    message = 'redefinition of function %r from line %r'
+    def __init__(self, filename, loc, name, orig_loc):
+        Message.__init__(self, filename, loc)
+        self.message_args = (name, orig_loc.lineno)
+
+
+class LateFutureImport(Message):
+    message = 'future import(s) %r after other statements'
+    def __init__(self, filename, loc, names):
+        Message.__init__(self, filename, loc)
+        self.message_args = (names,)
+
+
+class UnusedVariable(Message):
+    """
+    Indicates that a variable has been explicity assigned to but not actually
+    used.
+    """
+
+    message = 'local variable %r is assigned to but never used'
+    def __init__(self, filename, loc, names):
+        Message.__init__(self, filename, loc)
+        self.message_args = (names,)

.vim/ftplugin/python/pyflakes/pyflakes/scripts/pyflakes.py

@@ -0,0 +1,90 @@
+
+"""
+Implementation of the command-line I{pyflakes} tool.
+"""
+
+import sys
+import os
+import _ast
+
+checker = __import__('pyflakes.checker').checker
+
+def check(codeString, filename):
+    """
+    Check the Python source given by C{codeString} for flakes.
+
+    @param codeString: The Python source to check.
+    @type codeString: C{str}
+
+    @param filename: The name of the file the source came from, used to report
+        errors.
+    @type filename: C{str}
+
+    @return: The number of warnings emitted.
+    @rtype: C{int}
+    """
+    # First, compile into an AST and handle syntax errors.
+    try:
+        tree = compile(codeString, filename, "exec", _ast.PyCF_ONLY_AST)
+    except SyntaxError, value:
+        msg = value.args[0]
+
+        (lineno, offset, text) = value.lineno, value.offset, value.text
+
+        # If there's an encoding problem with the file, the text is None.
+        if text is None:
+            # Avoid using msg, since for the only known case, it contains a
+            # bogus message that claims the encoding the file declared was
+            # unknown.
+            print >> sys.stderr, "%s: problem decoding source" % (filename, )
+        else:
+            line = text.splitlines()[-1]
+
+            if offset is not None:
+                offset = offset - (len(text) - len(line))
+
+            print >> sys.stderr, '%s:%d: %s' % (filename, lineno, msg)
+            print >> sys.stderr, line
+
+            if offset is not None:
+                print >> sys.stderr, " " * offset, "^"
+
+        return 1
+    else:
+        # Okay, it's syntactically valid.  Now check it.
+        w = checker.Checker(tree, filename)
+        w.messages.sort(lambda a, b: cmp(a.lineno, b.lineno))
+        for warning in w.messages:
+            print warning
+        return len(w.messages)
+
+
+def checkPath(filename):
+    """
+    Check the given path, printing out any warnings detected.
+
+    @return: the number of warnings printed
+    """
+    try:
+        return check(file(filename, 'U').read() + '\n', filename)
+    except IOError, msg:
+        print >> sys.stderr, "%s: %s" % (filename, msg.args[1])
+        return 1
+
+
+def main():
+    warnings = 0
+    args = sys.argv[1:]
+    if args:
+        for arg in args:
+            if os.path.isdir(arg):
+                for dirpath, dirnames, filenames in os.walk(arg):
+                    for filename in filenames:
+                        if filename.endswith('.py'):
+                            warnings += checkPath(os.path.join(dirpath, filename))
+            else:
+                warnings += checkPath(arg)
+    else:
+        warnings += check(sys.stdin.read(), '<stdin>')
+
+    raise SystemExit(warnings > 0)

.vim/ftplugin/python/pyflakes/pyflakes/test/harness.py

@@ -0,0 +1,27 @@
+
+import textwrap
+import _ast
+
+from twisted.trial import unittest
+
+from pyflakes import checker
+
+
+class Test(unittest.TestCase):
+
+    def flakes(self, input, *expectedOutputs, **kw):
+        ast = compile(textwrap.dedent(input), "<test>", "exec",
+                      _ast.PyCF_ONLY_AST)
+        w = checker.Checker(ast, **kw)
+        outputs = [type(o) for o in w.messages]
+        expectedOutputs = list(expectedOutputs)
+        outputs.sort()
+        expectedOutputs.sort()
+        self.assert_(outputs == expectedOutputs, '''\
+for input:
+%s
+expected outputs:
+%s
+but got:
+%s''' % (input, repr(expectedOutputs), '\n'.join([str(o) for o in w.messages])))
+        return w

.vim/ftplugin/python/pyflakes/pyflakes/test/test_imports.py

@@ -0,0 +1,673 @@
+
+from sys import version_info
+
+from pyflakes import messages as m
+from pyflakes.test import harness
+
+class Test(harness.Test):
+
+    def test_unusedImport(self):
+        self.flakes('import fu, bar', m.UnusedImport, m.UnusedImport)
+        self.flakes('from baz import fu, bar', m.UnusedImport, m.UnusedImport)
+
+    def test_aliasedImport(self):
+        self.flakes('import fu as FU, bar as FU', m.RedefinedWhileUnused, m.UnusedImport)
+        self.flakes('from moo import fu as FU, bar as FU', m.RedefinedWhileUnused, m.UnusedImport)
+
+    def test_usedImport(self):
+        self.flakes('import fu; print fu')
+        self.flakes('from baz import fu; print fu')
+
+    def test_redefinedWhileUnused(self):
+        self.flakes('import fu; fu = 3', m.RedefinedWhileUnused)
+        self.flakes('import fu; del fu', m.RedefinedWhileUnused)
+        self.flakes('import fu; fu, bar = 3', m.RedefinedWhileUnused)
+        self.flakes('import fu; [fu, bar] = 3', m.RedefinedWhileUnused)
+
+    def test_redefinedByFunction(self):
+        self.flakes('''
+        import fu
+        def fu():
+            pass
+        ''', m.RedefinedWhileUnused)
+
+    def test_redefinedInNestedFunction(self):
+        """
+        Test that shadowing a global name with a nested function definition
+        generates a warning.
+        """
+        self.flakes('''
+        import fu
+        def bar():
+            def baz():
+                def fu():
+                    pass
+        ''', m.RedefinedWhileUnused, m.UnusedImport)
+
+    def test_redefinedByClass(self):
+        self.flakes('''
+        import fu
+        class fu:
+            pass
+        ''', m.RedefinedWhileUnused)
+
+
+    def test_redefinedBySubclass(self):
+        """
+        If an imported name is redefined by a class statement which also uses
+        that name in the bases list, no warning is emitted.
+        """
+        self.flakes('''
+        from fu import bar
+        class bar(bar):
+            pass
+        ''')
+
+
+    def test_redefinedInClass(self):
+        """
+        Test that shadowing a global with a class attribute does not produce a
+        warning.
+        """
+        self.flakes('''
+        import fu
+        class bar:
+            fu = 1
+        print fu
+        ''')
+
+    def test_usedInFunction(self):
+        self.flakes('''
+        import fu
+        def fun():
+            print fu
+        ''')
+
+    def test_shadowedByParameter(self):
+        self.flakes('''
+        import fu
+        def fun(fu):
+            print fu
+        ''', m.UnusedImport)
+
+        self.flakes('''
+        import fu
+        def fun(fu):
+            print fu
+        print fu
+        ''')
+
+    def test_newAssignment(self):
+        self.flakes('fu = None')
+
+    def test_usedInGetattr(self):
+        self.flakes('import fu; fu.bar.baz')
+        self.flakes('import fu; "bar".fu.baz', m.UnusedImport)
+
+    def test_usedInSlice(self):
+        self.flakes('import fu; print fu.bar[1:]')
+
+    def test_usedInIfBody(self):
+        self.flakes('''
+        import fu
+        if True: print fu
+        ''')
+
+    def test_usedInIfConditional(self):
+        self.flakes('''
+        import fu
+        if fu: pass
+        ''')
+
+    def test_usedInElifConditional(self):
+        self.flakes('''
+        import fu
+        if False: pass
+        elif fu: pass
+        ''')
+
+    def test_usedInElse(self):
+        self.flakes('''
+        import fu
+        if False: pass
+        else: print fu
+        ''')
+
+    def test_usedInCall(self):
+        self.flakes('import fu; fu.bar()')
+
+    def test_usedInClass(self):
+        self.flakes('''
+        import fu
+        class bar:
+            bar = fu
+        ''')
+
+    def test_usedInClassBase(self):
+        self.flakes('''
+        import fu
+        class bar(object, fu.baz):
+            pass
+        ''')
+
+    def test_notUsedInNestedScope(self):
+        self.flakes('''
+        import fu
+        def bleh():
+            pass
+        print fu
+        ''')
+
+    def test_usedInFor(self):
+        self.flakes('''
+        import fu
+        for bar in range(9):
+            print fu
+        ''')
+
+    def test_usedInForElse(self):
+        self.flakes('''
+        import fu
+        for bar in range(10):
+            pass
+        else:
+            print fu
+        ''')
+
+    def test_redefinedByFor(self):
+        self.flakes('''
+        import fu
+        for fu in range(2):
+            pass
+        ''', m.RedefinedWhileUnused)
+
+    def test_shadowedByFor(self):
+        """
+        Test that shadowing a global name with a for loop variable generates a
+        warning.
+        """
+        self.flakes('''
+        import fu
+        fu.bar()
+        for fu in ():
+            pass
+        ''', m.ImportShadowedByLoopVar)
+
+    def test_shadowedByForDeep(self):
+        """
+        Test that shadowing a global name with a for loop variable nested in a
+        tuple unpack generates a warning.
+        """
+        self.flakes('''
+        import fu
+        fu.bar()
+        for (x, y, z, (a, b, c, (fu,))) in ():
+            pass
+        ''', m.ImportShadowedByLoopVar)
+
+    def test_usedInReturn(self):
+        self.flakes('''
+        import fu
+        def fun():
+            return fu
+        ''')
+
+    def test_usedInOperators(self):
+        self.flakes('import fu; 3 + fu.bar')
+        self.flakes('import fu; 3 % fu.bar')
+        self.flakes('import fu; 3 - fu.bar')
+        self.flakes('import fu; 3 * fu.bar')
+        self.flakes('import fu; 3 ** fu.bar')
+        self.flakes('import fu; 3 / fu.bar')
+        self.flakes('import fu; 3 // fu.bar')
+        self.flakes('import fu; -fu.bar')
+        self.flakes('import fu; ~fu.bar')
+        self.flakes('import fu; 1 == fu.bar')
+        self.flakes('import fu; 1 | fu.bar')
+        self.flakes('import fu; 1 & fu.bar')
+        self.flakes('import fu; 1 ^ fu.bar')
+        self.flakes('import fu; 1 >> fu.bar')
+        self.flakes('import fu; 1 << fu.bar')
+
+    def test_usedInAssert(self):
+        self.flakes('import fu; assert fu.bar')
+
+    def test_usedInSubscript(self):
+        self.flakes('import fu; fu.bar[1]')
+
+    def test_usedInLogic(self):
+        self.flakes('import fu; fu and False')
+        self.flakes('import fu; fu or False')
+        self.flakes('import fu; not fu.bar')
+
+    def test_usedInList(self):
+        self.flakes('import fu; [fu]')
+
+    def test_usedInTuple(self):
+        self.flakes('import fu; (fu,)')
+
+    def test_usedInTry(self):
+        self.flakes('''
+        import fu
+        try: fu
+        except: pass
+        ''')
+
+    def test_usedInExcept(self):
+        self.flakes('''
+        import fu
+        try: fu
+        except: pass
+        ''')
+
+    def test_redefinedByExcept(self):
+        self.flakes('''
+        import fu
+        try: pass
+        except Exception, fu: pass
+        ''', m.RedefinedWhileUnused)
+
+    def test_usedInRaise(self):
+        self.flakes('''
+        import fu
+        raise fu.bar
+        ''')
+
+    def test_usedInYield(self):
+        self.flakes('''
+        import fu
+        def gen():
+            yield fu
+        ''')
+
+    def test_usedInDict(self):
+        self.flakes('import fu; {fu:None}')
+        self.flakes('import fu; {1:fu}')
+
+    def test_usedInParameterDefault(self):
+        self.flakes('''
+        import fu
+        def f(bar=fu):
+            pass
+        ''')
+
+    def test_usedInAttributeAssign(self):
+        self.flakes('import fu; fu.bar = 1')
+
+    def test_usedInKeywordArg(self):
+        self.flakes('import fu; fu.bar(stuff=fu)')
+
+    def test_usedInAssignment(self):
+        self.flakes('import fu; bar=fu')
+        self.flakes('import fu; n=0; n+=fu')
+
+    def test_usedInListComp(self):
+        self.flakes('import fu; [fu for _ in range(1)]')
+        self.flakes('import fu; [1 for _ in range(1) if fu]')
+
+    def test_redefinedByListComp(self):
+        self.flakes('import fu; [1 for fu in range(1)]', m.RedefinedWhileUnused)
+
+
+    def test_usedInTryFinally(self):
+        self.flakes('''
+        import fu
+        try: pass
+        finally: fu
+        ''')
+
+        self.flakes('''
+        import fu
+        try: fu
+        finally: pass
+        ''')
+
+    def test_usedInWhile(self):
+        self.flakes('''
+        import fu
+        while 0:
+            fu
+        ''')
+
+        self.flakes('''
+        import fu
+        while fu: pass
+        ''')
+
+    def test_usedInGlobal(self):
+        self.flakes('''
+        import fu
+        def f(): global fu
+        ''', m.UnusedImport)
+
+    def test_usedInBackquote(self):
+        self.flakes('import fu; `fu`')
+
+    def test_usedInExec(self):
+        self.flakes('import fu; exec "print 1" in fu.bar')
+
+    def test_usedInLambda(self):
+        self.flakes('import fu; lambda: fu')
+
+    def test_shadowedByLambda(self):
+        self.flakes('import fu; lambda fu: fu', m.UnusedImport)
+
+    def test_usedInSliceObj(self):
+        self.flakes('import fu; "meow"[::fu]')
+
+    def test_unusedInNestedScope(self):
+        self.flakes('''
+        def bar():
+            import fu
+        fu
+        ''', m.UnusedImport, m.UndefinedName)
+
+    def test_methodsDontUseClassScope(self):
+        self.flakes('''
+        class bar:
+            import fu
+            def fun(self):
+                fu
+        ''', m.UnusedImport, m.UndefinedName)
+
+    def test_nestedFunctionsNestScope(self):
+        self.flakes('''
+        def a():
+            def b():
+                fu
+            import fu
+        ''')
+
+    def test_nestedClassAndFunctionScope(self):
+        self.flakes('''
+        def a():
+            import fu
+            class b:
+                def c(self):
+                    print fu
+        ''')
+
+    def test_importStar(self):
+        self.flakes('from fu import *', m.ImportStarUsed)
+
+
+    def test_packageImport(self):
+        """
+        If a dotted name is imported and used, no warning is reported.
+        """
+        self.flakes('''
+        import fu.bar
+        fu.bar
+        ''')
+
+
+    def test_unusedPackageImport(self):
+        """
+        If a dotted name is imported and not used, an unused import warning is
+        reported.
+        """
+        self.flakes('import fu.bar', m.UnusedImport)
+
+
+    def test_duplicateSubmoduleImport(self):
+        """
+        If a submodule of a package is imported twice, an unused import warning
+        and a redefined while unused warning are reported.
+        """
+        self.flakes('''
+        import fu.bar, fu.bar
+        fu.bar
+        ''', m.RedefinedWhileUnused)
+        self.flakes('''
+        import fu.bar
+        import fu.bar
+        fu.bar
+        ''', m.RedefinedWhileUnused)
+
+
+    def test_differentSubmoduleImport(self):
+        """
+        If two different submodules of a package are imported, no duplicate
+        import warning is reported for the package.
+        """
+        self.flakes('''
+        import fu.bar, fu.baz
+        fu.bar, fu.baz
+        ''')
+        self.flakes('''
+        import fu.bar
+        import fu.baz
+        fu.bar, fu.baz
+        ''')
+
+    def test_assignRHSFirst(self):
+        self.flakes('import fu; fu = fu')
+        self.flakes('import fu; fu, bar = fu')
+        self.flakes('import fu; [fu, bar] = fu')
+        self.flakes('import fu; fu += fu')
+
+    def test_tryingMultipleImports(self):
+        self.flakes('''
+        try:
+            import fu
+        except ImportError:
+            import bar as fu
+        ''')
+    test_tryingMultipleImports.todo = ''
+
+    def test_nonGlobalDoesNotRedefine(self):
+        self.flakes('''
+        import fu
+        def a():
+            fu = 3
+            return fu
+        fu
+        ''')
+
+    def test_functionsRunLater(self):
+        self.flakes('''
+        def a():
+            fu
+        import fu
+        ''')
+
+    def test_functionNamesAreBoundNow(self):
+        self.flakes('''
+        import fu
+        def fu():
+            fu
+        fu
+        ''', m.RedefinedWhileUnused)
+
+    def test_ignoreNonImportRedefinitions(self):
+        self.flakes('a = 1; a = 2')
+
+    def test_importingForImportError(self):
+        self.flakes('''
+        try:
+            import fu
+        except ImportError:
+            pass
+        ''')
+    test_importingForImportError.todo = ''
+
+    def test_importedInClass(self):
+        '''Imports in class scope can be used through self'''
+        self.flakes('''
+        class c:
+            import i
+            def __init__(self):
+                self.i
+        ''')
+    test_importedInClass.todo = 'requires evaluating attribute access'
+
+    def test_futureImport(self):
+        '''__future__ is special'''
+        self.flakes('from __future__ import division')
+        self.flakes('''
+        "docstring is allowed before future import"
+        from __future__ import division
+        ''')
+
+    def test_futureImportFirst(self):
+        """
+        __future__ imports must come before anything else.
+        """
+        self.flakes('''
+        x = 5
+        from __future__ import division
+        ''', m.LateFutureImport)
+        self.flakes('''
+        from foo import bar
+        from __future__ import division
+        bar
+        ''', m.LateFutureImport)
+
+
+
+class TestSpecialAll(harness.Test):
+    """
+    Tests for suppression of unused import warnings by C{__all__}.
+    """
+    def test_ignoredInFunction(self):
+        """
+        An C{__all__} definition does not suppress unused import warnings in a
+        function scope.
+        """
+        self.flakes('''
+        def foo():
+            import bar
+            __all__ = ["bar"]
+        ''', m.UnusedImport, m.UnusedVariable)
+
+
+    def test_ignoredInClass(self):
+        """
+        An C{__all__} definition does not suppress unused import warnings in a
+        class scope.
+        """
+        self.flakes('''
+        class foo:
+            import bar
+            __all__ = ["bar"]
+        ''', m.UnusedImport)
+
+
+    def test_warningSuppressed(self):
+        """
+        If a name is imported and unused but is named in C{__all__}, no warning
+        is reported.
+        """
+        self.flakes('''
+        import foo
+        __all__ = ["foo"]
+        ''')
+
+
+    def test_unrecognizable(self):
+        """
+        If C{__all__} is defined in a way that can't be recognized statically,
+        it is ignored.
+        """
+        self.flakes('''
+        import foo
+        __all__ = ["f" + "oo"]
+        ''', m.UnusedImport)
+        self.flakes('''
+        import foo
+        __all__ = [] + ["foo"]
+        ''', m.UnusedImport)
+
+
+    def test_unboundExported(self):
+        """
+        If C{__all__} includes a name which is not bound, a warning is emitted.
+        """
+        self.flakes('''
+        __all__ = ["foo"]
+        ''', m.UndefinedExport)
+
+        # Skip this in __init__.py though, since the rules there are a little
+        # different.
+        for filename in ["foo/__init__.py", "__init__.py"]:
+            self.flakes('''
+            __all__ = ["foo"]
+            ''', filename=filename)
+
+
+    def test_usedInGenExp(self):
+        """
+        Using a global in a generator expression results in no warnings.
+        """
+        self.flakes('import fu; (fu for _ in range(1))')
+        self.flakes('import fu; (1 for _ in range(1) if fu)')
+
+
+    def test_redefinedByGenExp(self):
+        """
+        Re-using a global name as the loop variable for a generator
+        expression results in a redefinition warning.
+        """
+        self.flakes('import fu; (1 for fu in range(1))', m.RedefinedWhileUnused)
+
+
+    def test_usedAsDecorator(self):
+        """
+        Using a global name in a decorator statement results in no warnings,
+        but using an undefined name in a decorator statement results in an
+        undefined name warning.
+        """
+        self.flakes('''
+        from interior import decorate
+        @decorate
+        def f():
+            return "hello"
+        ''')
+
+        self.flakes('''
+        from interior import decorate
+        @decorate('value')
+        def f():
+            return "hello"
+        ''')
+
+        self.flakes('''
+        @decorate
+        def f():
+            return "hello"
+        ''', m.UndefinedName)
+
+
+class Python26Tests(harness.Test):
+    """
+    Tests for checking of syntax which is valid in PYthon 2.6 and newer.
+    """
+    if version_info < (2, 6):
+        skip = "Python 2.6 required for class decorator tests."
+
+
+    def test_usedAsClassDecorator(self):
+        """
+        Using an imported name as a class decorator results in no warnings,
+        but using an undefined name as a class decorator results in an
+        undefined name warning.
+        """
+        self.flakes('''
+        from interior import decorate
+        @decorate
+        class foo:
+            pass
+        ''')
+
+        self.flakes('''
+        from interior import decorate
+        @decorate("foo")
+        class bar:
+            pass
+        ''')
+
+        self.flakes('''
+        @decorate
+        class foo:
+            pass
+        ''', m.UndefinedName)

.vim/ftplugin/python/pyflakes/pyflakes/test/test_other.py

@@ -0,0 +1,575 @@
+# (c) 2005-2010 Divmod, Inc.
+# See LICENSE file for details
+
+"""
+Tests for various Pyflakes behavior.
+"""
+
+from sys import version_info
+
+from pyflakes import messages as m
+from pyflakes.test import harness
+
+
+class Test(harness.Test):
+
+    def test_duplicateArgs(self):
+        self.flakes('def fu(bar, bar): pass', m.DuplicateArgument)
+
+    def test_localReferencedBeforeAssignment(self):
+        self.flakes('''
+        a = 1
+        def f():
+            a; a=1
+        f()
+        ''', m.UndefinedName)
+    test_localReferencedBeforeAssignment.todo = 'this requires finding all assignments in the function body first'
+
+    def test_redefinedFunction(self):
+        """
+        Test that shadowing a function definition with another one raises a
+        warning.
+        """
+        self.flakes('''
+        def a(): pass
+        def a(): pass
+        ''', m.RedefinedFunction)
+
+    def test_redefinedClassFunction(self):
+        """
+        Test that shadowing a function definition in a class suite with another
+        one raises a warning.
+        """
+        self.flakes('''
+        class A:
+            def a(): pass
+            def a(): pass
+        ''', m.RedefinedFunction)
+
+    def test_functionDecorator(self):
+        """
+        Test that shadowing a function definition with a decorated version of
+        that function does not raise a warning.
+        """
+        self.flakes('''
+        from somewhere import somedecorator
+
+        def a(): pass
+        a = somedecorator(a)
+        ''')
+
+    def test_classFunctionDecorator(self):
+        """
+        Test that shadowing a function definition in a class suite with a
+        decorated version of that function does not raise a warning.
+        """
+        self.flakes('''
+        class A:
+            def a(): pass
+            a = classmethod(a)
+        ''')
+
+    def test_unaryPlus(self):
+        '''Don't die on unary +'''
+        self.flakes('+1')
+
+
+    def test_undefinedBaseClass(self):
+        """
+        If a name in the base list of a class definition is undefined, a
+        warning is emitted.
+        """
+        self.flakes('''
+        class foo(foo):
+            pass
+        ''', m.UndefinedName)
+
+
+    def test_classNameUndefinedInClassBody(self):
+        """
+        If a class name is used in the body of that class's definition and
+        the name is not already defined, a warning is emitted.
+        """
+        self.flakes('''
+        class foo:
+            foo
+        ''', m.UndefinedName)
+
+
+    def test_classNameDefinedPreviously(self):
+        """
+        If a class name is used in the body of that class's definition and
+        the name was previously defined in some other way, no warning is
+        emitted.
+        """
+        self.flakes('''
+        foo = None
+        class foo:
+            foo
+        ''')
+
+
+    def test_comparison(self):
+        """
+        If a defined name is used on either side of any of the six comparison
+        operators, no warning is emitted.
+        """
+        self.flakes('''
+        x = 10
+        y = 20
+        x < y
+        x <= y
+        x == y
+        x != y
+        x >= y
+        x > y
+        ''')
+
+
+    def test_identity(self):
+        """
+        If a deefined name is used on either side of an identity test, no
+        warning is emitted.
+        """
+        self.flakes('''
+        x = 10
+        y = 20
+        x is y
+        x is not y
+        ''')
+
+
+    def test_containment(self):
+        """
+        If a defined name is used on either side of a containment test, no
+        warning is emitted.
+        """
+        self.flakes('''
+        x = 10
+        y = 20
+        x in y
+        x not in y
+        ''')
+
+
+    def test_loopControl(self):
+        """
+        break and continue statements are supported.
+        """
+        self.flakes('''
+        for x in [1, 2]:
+            break
+        ''')
+        self.flakes('''
+        for x in [1, 2]:
+            continue
+        ''')
+
+
+    def test_ellipsis(self):
+        """
+        Ellipsis in a slice is supported.
+        """
+        self.flakes('''
+        [1, 2][...]
+        ''')
+
+
+    def test_extendedSlice(self):
+        """
+        Extended slices are supported.
+        """
+        self.flakes('''
+        x = 3
+        [1, 2][x,:]
+        ''')
+
+
+
+class TestUnusedAssignment(harness.Test):
+    """
+    Tests for warning about unused assignments.
+    """
+
+    def test_unusedVariable(self):
+        """
+        Warn when a variable in a function is assigned a value that's never
+        used.
+        """
+        self.flakes('''
+        def a():
+            b = 1
+        ''', m.UnusedVariable)
+
+
+    def test_assignToGlobal(self):
+        """
+        Assigning to a global and then not using that global is perfectly
+        acceptable. Do not mistake it for an unused local variable.
+        """
+        self.flakes('''
+        b = 0
+        def a():
+            global b
+            b = 1
+        ''')
+
+
+    def test_assignToMember(self):
+        """
+        Assigning to a member of another object and then not using that member
+        variable is perfectly acceptable. Do not mistake it for an unused
+        local variable.
+        """
+        # XXX: Adding this test didn't generate a failure. Maybe not
+        # necessary?
+        self.flakes('''
+        class b:
+            pass
+        def a():
+            b.foo = 1
+        ''')
+
+
+    def test_assignInForLoop(self):
+        """
+        Don't warn when a variable in a for loop is assigned to but not used.
+        """
+        self.flakes('''
+        def f():
+            for i in range(10):
+                pass
+        ''')
+
+
+    def test_assignInListComprehension(self):
+        """
+        Don't warn when a variable in a list comprehension is assigned to but
+        not used.
+        """
+        self.flakes('''
+        def f():
+            [None for i in range(10)]
+        ''')
+
+
+    def test_generatorExpression(self):
+        """
+        Don't warn when a variable in a generator expression is assigned to but not used.
+        """
+        self.flakes('''
+        def f():
+            (None for i in range(10))
+        ''')
+
+
+    def test_assignmentInsideLoop(self):
+        """
+        Don't warn when a variable assignment occurs lexically after its use.
+        """
+        self.flakes('''
+        def f():
+            x = None
+            for i in range(10):
+                if i > 2:
+                    return x
+                x = i * 2
+        ''')
+
+
+    def test_tupleUnpacking(self):
+        """
+        Don't warn when a variable included in tuple unpacking is unused. It's
+        very common for variables in a tuple unpacking assignment to be unused
+        in good Python code, so warning will only create false positives.
+        """
+        self.flakes('''
+        def f():
+            (x, y) = 1, 2
+        ''')
+
+
+    def test_listUnpacking(self):
+        """
+        Don't warn when a variable included in list unpacking is unused.
+        """
+        self.flakes('''
+        def f():
+            [x, y] = [1, 2]
+        ''')
+
+
+    def test_closedOver(self):
+        """
+        Don't warn when the assignment is used in an inner function.
+        """
+        self.flakes('''
+        def barMaker():
+            foo = 5
+            def bar():
+                return foo
+            return bar
+        ''')
+
+
+    def test_doubleClosedOver(self):
+        """
+        Don't warn when the assignment is used in an inner function, even if
+        that inner function itself is in an inner function.
+        """
+        self.flakes('''
+        def barMaker():
+            foo = 5
+            def bar():
+                def baz():
+                    return foo
+            return bar
+        ''')
+
+
+
+class Python25Test(harness.Test):
+    """
+    Tests for checking of syntax only available in Python 2.5 and newer.
+    """
+    if version_info < (2, 5):
+        skip = "Python 2.5 required for if-else and with tests"
+
+    def test_ifexp(self):
+        """
+        Test C{foo if bar else baz} statements.
+        """
+        self.flakes("a = 'moo' if True else 'oink'")
+        self.flakes("a = foo if True else 'oink'", m.UndefinedName)
+        self.flakes("a = 'moo' if True else bar", m.UndefinedName)
+
+
+    def test_withStatementNoNames(self):
+        """
+        No warnings are emitted for using inside or after a nameless C{with}
+        statement a name defined beforehand.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        bar = None
+        with open("foo"):
+            bar
+        bar
+        ''')
+
+    def test_withStatementSingleName(self):
+        """
+        No warnings are emitted for using a name defined by a C{with} statement
+        within the suite or afterwards.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with open('foo') as bar:
+            bar
+        bar
+        ''')
+
+
+    def test_withStatementAttributeName(self):
+        """
+        No warnings are emitted for using an attribute as the target of a
+        C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        import foo
+        with open('foo') as foo.bar:
+            pass
+        ''')
+
+
+    def test_withStatementSubscript(self):
+        """
+        No warnings are emitted for using a subscript as the target of a
+        C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        import foo
+        with open('foo') as foo[0]:
+            pass
+        ''')
+
+
+    def test_withStatementSubscriptUndefined(self):
+        """
+        An undefined name warning is emitted if the subscript used as the
+        target of a C{with} statement is not defined.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        import foo
+        with open('foo') as foo[bar]:
+            pass
+        ''', m.UndefinedName)
+
+
+    def test_withStatementTupleNames(self):
+        """
+        No warnings are emitted for using any of the tuple of names defined by
+        a C{with} statement within the suite or afterwards.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with open('foo') as (bar, baz):
+            bar, baz
+        bar, baz
+        ''')
+
+
+    def test_withStatementListNames(self):
+        """
+        No warnings are emitted for using any of the list of names defined by a
+        C{with} statement within the suite or afterwards.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with open('foo') as [bar, baz]:
+            bar, baz
+        bar, baz
+        ''')
+
+
+    def test_withStatementComplicatedTarget(self):
+        """
+        If the target of a C{with} statement uses any or all of the valid forms
+        for that part of the grammar (See
+        U{http://docs.python.org/reference/compound_stmts.html#the-with-statement}),
+        the names involved are checked both for definedness and any bindings
+        created are respected in the suite of the statement and afterwards.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        c = d = e = g = h = i = None
+        with open('foo') as [(a, b), c[d], e.f, g[h:i]]:
+            a, b, c, d, e, g, h, i
+        a, b, c, d, e, g, h, i
+        ''')
+
+
+    def test_withStatementSingleNameUndefined(self):
+        """
+        An undefined name warning is emitted if the name first defined by a
+        C{with} statement is used before the C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        bar
+        with open('foo') as bar:
+            pass
+        ''', m.UndefinedName)
+
+
+    def test_withStatementTupleNamesUndefined(self):
+        """
+        An undefined name warning is emitted if a name first defined by a the
+        tuple-unpacking form of the C{with} statement is used before the
+        C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        baz
+        with open('foo') as (bar, baz):
+            pass
+        ''', m.UndefinedName)
+
+
+    def test_withStatementSingleNameRedefined(self):
+        """
+        A redefined name warning is emitted if a name bound by an import is
+        rebound by the name defined by a C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        import bar
+        with open('foo') as bar:
+            pass
+        ''', m.RedefinedWhileUnused)
+
+
+    def test_withStatementTupleNamesRedefined(self):
+        """
+        A redefined name warning is emitted if a name bound by an import is
+        rebound by one of the names defined by the tuple-unpacking form of a
+        C{with} statement.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        import bar
+        with open('foo') as (bar, baz):
+            pass
+        ''', m.RedefinedWhileUnused)
+
+
+    def test_withStatementUndefinedInside(self):
+        """
+        An undefined name warning is emitted if a name is used inside the
+        body of a C{with} statement without first being bound.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with open('foo') as bar:
+            baz
+        ''', m.UndefinedName)
+
+
+    def test_withStatementNameDefinedInBody(self):
+        """
+        A name defined in the body of a C{with} statement can be used after
+        the body ends without warning.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with open('foo') as bar:
+            baz = 10
+        baz
+        ''')
+
+
+    def test_withStatementUndefinedInExpression(self):
+        """
+        An undefined name warning is emitted if a name in the I{test}
+        expression of a C{with} statement is undefined.
+        """
+        self.flakes('''
+        from __future__ import with_statement
+        with bar as baz:
+            pass
+        ''', m.UndefinedName)
+
+        self.flakes('''
+        from __future__ import with_statement
+        with bar as bar:
+            pass
+        ''', m.UndefinedName)
+
+
+
+class Python27Test(harness.Test):
+    """
+    Tests for checking of syntax only available in Python 2.7 and newer.
+    """
+    if version_info < (2, 7):
+        skip = "Python 2.7 required for dict/set comprehension tests"
+
+    def test_dictComprehension(self):
+        """
+        Dict comprehensions are properly handled.
+        """
+        self.flakes('''
+        a = {1: x for x in range(10)}
+        ''')
+
+    def test_setComprehensionAndLiteral(self):
+        """
+        Set comprehensions are properly handled.
+        """
+        self.flakes('''
+        a = {1, 2, 3}
+        b = {x for x in range(10)}
+        ''')

.vim/ftplugin/python/pyflakes/pyflakes/test/test_script.py

@@ -0,0 +1,185 @@
+
+"""
+Tests for L{pyflakes.scripts.pyflakes}.
+"""
+
+import sys
+from StringIO import StringIO
+
+from twisted.python.filepath import FilePath
+from twisted.trial.unittest import TestCase
+
+from pyflakes.scripts.pyflakes import checkPath
+
+def withStderrTo(stderr, f):
+    """
+    Call C{f} with C{sys.stderr} redirected to C{stderr}.
+    """
+    (outer, sys.stderr) = (sys.stderr, stderr)
+    try:
+        return f()
+    finally:
+        sys.stderr = outer
+
+
+
+class CheckTests(TestCase):
+    """
+    Tests for L{check} and L{checkPath} which check a file for flakes.
+    """
+    def test_missingTrailingNewline(self):
+        """
+        Source which doesn't end with a newline shouldn't cause any
+        exception to be raised nor an error indicator to be returned by
+        L{check}.
+        """
+        fName = self.mktemp()
+        FilePath(fName).setContent("def foo():\n\tpass\n\t")
+        self.assertFalse(checkPath(fName))
+
+
+    def test_checkPathNonExisting(self):
+        """
+        L{checkPath} handles non-existing files.
+        """
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath('extremo'))
+        self.assertEquals(err.getvalue(), 'extremo: No such file or directory\n')
+        self.assertEquals(count, 1)
+
+
+    def test_multilineSyntaxError(self):
+        """
+        Source which includes a syntax error which results in the raised
+        L{SyntaxError.text} containing multiple lines of source are reported
+        with only the last line of that source.
+        """
+        source = """\
+def foo():
+    '''
+
+def bar():
+    pass
+
+def baz():
+    '''quux'''
+"""
+
+        # Sanity check - SyntaxError.text should be multiple lines, if it
+        # isn't, something this test was unprepared for has happened.
+        def evaluate(source):
+            exec source
+        exc = self.assertRaises(SyntaxError, evaluate, source)
+        self.assertTrue(exc.text.count('\n') > 1)
+
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent(source)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEqual(count, 1)
+
+        self.assertEqual(
+            err.getvalue(),
+            """\
+%s:8: invalid syntax
+    '''quux'''
+           ^
+""" % (sourcePath.path,))
+
+
+    def test_eofSyntaxError(self):
+        """
+        The error reported for source files which end prematurely causing a
+        syntax error reflects the cause for the syntax error.
+        """
+        source = "def foo("
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent(source)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEqual(count, 1)
+        self.assertEqual(
+            err.getvalue(),
+            """\
+%s:1: unexpected EOF while parsing
+def foo(
+         ^
+""" % (sourcePath.path,))
+
+
+    def test_nonDefaultFollowsDefaultSyntaxError(self):
+        """
+        Source which has a non-default argument following a default argument
+        should include the line number of the syntax error.  However these
+        exceptions do not include an offset.
+        """
+        source = """\
+def foo(bar=baz, bax):
+    pass
+"""
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent(source)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEqual(count, 1)
+        self.assertEqual(
+            err.getvalue(),
+            """\
+%s:1: non-default argument follows default argument
+def foo(bar=baz, bax):
+""" % (sourcePath.path,))
+
+
+    def test_nonKeywordAfterKeywordSyntaxError(self):
+        """
+        Source which has a non-keyword argument after a keyword argument should
+        include the line number of the syntax error.  However these exceptions
+        do not include an offset.
+        """
+        source = """\
+foo(bar=baz, bax)
+"""
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent(source)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEqual(count, 1)
+        self.assertEqual(
+            err.getvalue(),
+            """\
+%s:1: non-keyword arg after keyword arg
+foo(bar=baz, bax)
+""" % (sourcePath.path,))
+
+
+    def test_permissionDenied(self):
+        """
+        If the a source file is not readable, this is reported on standard
+        error.
+        """
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent('')
+        sourcePath.chmod(0)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEquals(count, 1)
+        self.assertEquals(
+            err.getvalue(), "%s: Permission denied\n" % (sourcePath.path,))
+
+
+    def test_misencodedFile(self):
+        """
+        If a source file contains bytes which cannot be decoded, this is
+        reported on stderr.
+        """
+        source = u"""\
+# coding: ascii
+x = "\N{SNOWMAN}"
+""".encode('utf-8')
+        sourcePath = FilePath(self.mktemp())
+        sourcePath.setContent(source)
+        err = StringIO()
+        count = withStderrTo(err, lambda: checkPath(sourcePath.path))
+        self.assertEquals(count, 1)
+        self.assertEquals(
+            err.getvalue(), "%s: problem decoding source\n" % (sourcePath.path,))

.vim/ftplugin/python/pyflakes/pyflakes/test/test_undefined_names.py

@@ -0,0 +1,265 @@
+
+from _ast import PyCF_ONLY_AST
+
+from twisted.trial.unittest import TestCase
+
+from pyflakes import messages as m, checker
+from pyflakes.test import harness
+
+
+class Test(harness.Test):
+    def test_undefined(self):
+        self.flakes('bar', m.UndefinedName)
+
+    def test_definedInListComp(self):
+        self.flakes('[a for a in range(10) if a]')
+
+
+    def test_functionsNeedGlobalScope(self):
+        self.flakes('''
+        class a:
+            def b():
+                fu
+        fu = 1
+        ''')
+
+    def test_builtins(self):
+        self.flakes('range(10)')
+
+
+    def test_magicGlobalsFile(self):
+        """
+        Use of the C{__file__} magic global should not emit an undefined name
+        warning.
+        """
+        self.flakes('__file__')
+
+
+    def test_magicGlobalsBuiltins(self):
+        """
+        Use of the C{__builtins__} magic global should not emit an undefined
+        name warning.
+        """
+        self.flakes('__builtins__')
+
+
+    def test_magicGlobalsName(self):
+        """
+        Use of the C{__name__} magic global should not emit an undefined name
+        warning.
+        """
+        self.flakes('__name__')
+
+
+    def test_magicGlobalsPath(self):
+        """
+        Use of the C{__path__} magic global should not emit an undefined name
+        warning, if you refer to it from a file called __init__.py.
+        """
+        self.flakes('__path__', m.UndefinedName)
+        self.flakes('__path__', filename='package/__init__.py')
+
+
+    def test_globalImportStar(self):
+        '''Can't find undefined names with import *'''
+        self.flakes('from fu import *; bar', m.ImportStarUsed)
+
+    def test_localImportStar(self):
+        '''A local import * still allows undefined names to be found in upper scopes'''
+        self.flakes('''
+        def a():
+            from fu import *
+        bar
+        ''', m.ImportStarUsed, m.UndefinedName)
+
+    def test_unpackedParameter(self):
+        '''Unpacked function parameters create bindings'''
+        self.flakes('''
+        def a((bar, baz)):
+            bar; baz
+        ''')
+
+    def test_definedByGlobal(self):
+        '''"global" can make an otherwise undefined name in another function defined'''
+        self.flakes('''
+        def a(): global fu; fu = 1
+        def b(): fu
+        ''')
+    test_definedByGlobal.todo = ''
+
+    def test_globalInGlobalScope(self):
+        """
+        A global statement in the global scope is ignored.
+        """
+        self.flakes('''
+        global x
+        def foo():
+            print x
+        ''', m.UndefinedName)
+
+    def test_del(self):
+        '''del deletes bindings'''
+        self.flakes('a = 1; del a; a', m.UndefinedName)
+
+    def test_delGlobal(self):
+        '''del a global binding from a function'''
+        self.flakes('''
+        a = 1
+        def f():
+            global a
+            del a
+        a
+        ''')
+
+    def test_delUndefined(self):
+        '''del an undefined name'''
+        self.flakes('del a', m.UndefinedName)
+
+    def test_globalFromNestedScope(self):
+        '''global names are available from nested scopes'''
+        self.flakes('''
+        a = 1
+        def b():
+            def c():
+                a
+        ''')
+
+    def test_laterRedefinedGlobalFromNestedScope(self):
+        """
+        Test that referencing a local name that shadows a global, before it is
+        defined, generates a warning.
+        """
+        self.flakes('''
+        a = 1
+        def fun():
+            a
+            a = 2
+            return a
+        ''', m.UndefinedLocal)
+
+    def test_laterRedefinedGlobalFromNestedScope2(self):
+        """
+        Test that referencing a local name in a nested scope that shadows a
+        global declared in an enclosing scope, before it is defined, generates
+        a warning.
+        """
+        self.flakes('''
+            a = 1
+            def fun():
+                global a
+                def fun2():
+                    a
+                    a = 2
+                    return a
+        ''', m.UndefinedLocal)
+
+
+    def test_intermediateClassScopeIgnored(self):
+        """
+        If a name defined in an enclosing scope is shadowed by a local variable
+        and the name is used locally before it is bound, an unbound local
+        warning is emitted, even if there is a class scope between the enclosing
+        scope and the local scope.
+        """
+        self.flakes('''
+        def f():
+            x = 1
+            class g:
+                def h(self):
+                    a = x
+                    x = None
+                    print x, a
+            print x
+        ''', m.UndefinedLocal)
+
+
+    def test_doubleNestingReportsClosestName(self):
+        """
+        Test that referencing a local name in a nested scope that shadows a
+        variable declared in two different outer scopes before it is defined
+        in the innermost scope generates an UnboundLocal warning which
+        refers to the nearest shadowed name.
+        """
+        exc = self.flakes('''
+            def a():
+                x = 1
+                def b():
+                    x = 2 # line 5
+                    def c():
+                        x
+                        x = 3
+                        return x
+                    return x
+                return x
+        ''', m.UndefinedLocal).messages[0]
+        self.assertEqual(exc.message_args, ('x', 5))
+
+
+    def test_laterRedefinedGlobalFromNestedScope3(self):
+        """
+        Test that referencing a local name in a nested scope that shadows a
+        global, before it is defined, generates a warning.
+        """
+        self.flakes('''
+            def fun():
+                a = 1
+                def fun2():
+                    a
+                    a = 1
+                    return a
+                return a
+        ''', m.UndefinedLocal)
+
+    def test_nestedClass(self):
+        '''nested classes can access enclosing scope'''
+        self.flakes('''
+        def f(foo):
+            class C:
+                bar = foo
+                def f(self):
+                    return foo
+            return C()
+
+        f(123).f()
+        ''')
+
+    def test_badNestedClass(self):
+        '''free variables in nested classes must bind at class creation'''
+        self.flakes('''
+        def f():
+            class C:
+                bar = foo
+            foo = 456
+            return foo
+        f()
+        ''', m.UndefinedName)
+
+    def test_definedAsStarArgs(self):
+        '''star and double-star arg names are defined'''
+        self.flakes('''
+        def f(a, *b, **c):
+            print a, b, c
+        ''')
+
+    def test_definedInGenExp(self):
+        """
+        Using the loop variable of a generator expression results in no
+        warnings.
+        """
+        self.flakes('(a for a in xrange(10) if a)')
+
+
+
+class NameTests(TestCase):
+    """
+    Tests for some extra cases of name handling.
+    """
+    def test_impossibleContext(self):
+        """
+        A Name node with an unrecognized context results in a RuntimeError being
+        raised.
+        """
+        tree = compile("x = 10", "<test>", "exec", PyCF_ONLY_AST)
+        # Make it into something unrecognizable.
+        tree.body[0].targets[0].ctx = object()
+        self.assertRaises(RuntimeError, checker.Checker, tree)

.vim/ftplugin/python/pyflakes/setup.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python
+# (c) 2005-2009 Divmod, Inc.  See LICENSE file for details
+
+from distutils.core import setup
+
+setup(
+    name="pyflakes",
+    license="MIT",
+    version="0.4.0",
+    description="passive checker of Python programs",
+    author="Phil Frost",
+    maintainer="Moe Aboulkheir",
+    maintainer_email="moe@divmod.com",
+    url="http://www.divmod.org/trac/wiki/DivmodPyflakes",
+    packages=["pyflakes", "pyflakes.scripts", "pyflakes.test"],
+    scripts=["bin/pyflakes"],
+    long_description="""Pyflakes is program to analyze Python programs and detect various errors. It
+works by parsing the source file, not importing it, so it is safe to use on
+modules with side effects. It's also much faster.""",
+    classifiers=[
+        "Development Status :: 6 - Mature",
+        "Environment :: Console",
+        "Intended Audience :: Developers",
+        "License :: OSI Approved :: MIT License",
+        "Programming Language :: Python",
+        "Topic :: Software Development",
+        "Topic :: Utilities",
+        ])