From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 python/mozlint/mozlint/__init__.py                 |   7 +
 python/mozlint/mozlint/cli.py                      | 115 +++++++++++++++
 python/mozlint/mozlint/errors.py                   |  25 ++++
 python/mozlint/mozlint/formatters/__init__.py      |  25 ++++
 python/mozlint/mozlint/formatters/stylish.py       | 122 ++++++++++++++++
 python/mozlint/mozlint/formatters/treeherder.py    |  31 ++++
 python/mozlint/mozlint/parser.py                   |  85 +++++++++++
 python/mozlint/mozlint/pathutils.py                | 156 +++++++++++++++++++++
 python/mozlint/mozlint/result.py                   |  88 ++++++++++++
 python/mozlint/mozlint/roller.py                   | 154 ++++++++++++++++++++
 python/mozlint/mozlint/types.py                    | 142 +++++++++++++++++++
 python/mozlint/mozlint/vcs.py                      |  62 ++++++++
 python/mozlint/setup.py                            |  26 ++++
 python/mozlint/test/__init__.py                    |   0
 python/mozlint/test/conftest.py                    |  42 ++++++
 python/mozlint/test/files/foobar.js                |   2 +
 python/mozlint/test/files/foobar.py                |   2 +
 python/mozlint/test/files/no_foobar.js             |   2 +
 python/mozlint/test/linters/badreturncode.lint     |  21 +++
 python/mozlint/test/linters/explicit_path.lint     |  13 ++
 python/mozlint/test/linters/external.lint          |  30 ++++
 python/mozlint/test/linters/invalid_exclude.lint   |  10 ++
 python/mozlint/test/linters/invalid_extension.lnt  |   9 ++
 python/mozlint/test/linters/invalid_include.lint   |  10 ++
 python/mozlint/test/linters/invalid_type.lint      |   9 ++
 python/mozlint/test/linters/missing_attrs.lint     |   7 +
 .../mozlint/test/linters/missing_definition.lint   |   4 +
 python/mozlint/test/linters/raises.lint            |  19 +++
 python/mozlint/test/linters/regex.lint             |  15 ++
 python/mozlint/test/linters/string.lint            |  15 ++
 python/mozlint/test/linters/structured.lint        |  28 ++++
 python/mozlint/test/test_formatters.py             |  90 ++++++++++++
 python/mozlint/test/test_parser.py                 |  55 ++++++++
 python/mozlint/test/test_roller.py                 |  82 +++++++++++
 python/mozlint/test/test_types.py                  |  50 +++++++
 35 files changed, 1553 insertions(+)
 create mode 100644 python/mozlint/mozlint/__init__.py
 create mode 100644 python/mozlint/mozlint/cli.py
 create mode 100644 python/mozlint/mozlint/errors.py
 create mode 100644 python/mozlint/mozlint/formatters/__init__.py
 create mode 100644 python/mozlint/mozlint/formatters/stylish.py
 create mode 100644 python/mozlint/mozlint/formatters/treeherder.py
 create mode 100644 python/mozlint/mozlint/parser.py
 create mode 100644 python/mozlint/mozlint/pathutils.py
 create mode 100644 python/mozlint/mozlint/result.py
 create mode 100644 python/mozlint/mozlint/roller.py
 create mode 100644 python/mozlint/mozlint/types.py
 create mode 100644 python/mozlint/mozlint/vcs.py
 create mode 100644 python/mozlint/setup.py
 create mode 100644 python/mozlint/test/__init__.py
 create mode 100644 python/mozlint/test/conftest.py
 create mode 100644 python/mozlint/test/files/foobar.js
 create mode 100644 python/mozlint/test/files/foobar.py
 create mode 100644 python/mozlint/test/files/no_foobar.js
 create mode 100644 python/mozlint/test/linters/badreturncode.lint
 create mode 100644 python/mozlint/test/linters/explicit_path.lint
 create mode 100644 python/mozlint/test/linters/external.lint
 create mode 100644 python/mozlint/test/linters/invalid_exclude.lint
 create mode 100644 python/mozlint/test/linters/invalid_extension.lnt
 create mode 100644 python/mozlint/test/linters/invalid_include.lint
 create mode 100644 python/mozlint/test/linters/invalid_type.lint
 create mode 100644 python/mozlint/test/linters/missing_attrs.lint
 create mode 100644 python/mozlint/test/linters/missing_definition.lint
 create mode 100644 python/mozlint/test/linters/raises.lint
 create mode 100644 python/mozlint/test/linters/regex.lint
 create mode 100644 python/mozlint/test/linters/string.lint
 create mode 100644 python/mozlint/test/linters/structured.lint
 create mode 100644 python/mozlint/test/test_formatters.py
 create mode 100644 python/mozlint/test/test_parser.py
 create mode 100644 python/mozlint/test/test_roller.py
 create mode 100644 python/mozlint/test/test_types.py

(limited to 'python/mozlint')

diff --git a/python/mozlint/mozlint/__init__.py b/python/mozlint/mozlint/__init__.py
new file mode 100644
index 000000000..18eaf5112
--- /dev/null
+++ b/python/mozlint/mozlint/__init__.py
@@ -0,0 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+# flake8: noqa
+
+from .roller import LintRoller
+from .result import ResultContainer
diff --git a/python/mozlint/mozlint/cli.py b/python/mozlint/mozlint/cli.py
new file mode 100644
index 000000000..84c1b6aa4
--- /dev/null
+++ b/python/mozlint/mozlint/cli.py
@@ -0,0 +1,115 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import print_function, unicode_literals
+
+import os
+import sys
+from argparse import ArgumentParser, REMAINDER
+
+
+SEARCH_PATHS = []
+
+
+class MozlintParser(ArgumentParser):
+    arguments = [
+        [['paths'],
+         {'nargs': '*',
+          'default': None,
+          'help': "Paths to file or directories to lint, like "
+                  "'browser/components/loop' or 'mobile/android'. "
+                  "Defaults to the current directory if not given.",
+          }],
+        [['-l', '--linter'],
+         {'dest': 'linters',
+          'default': [],
+          'action': 'append',
+          'help': "Linters to run, e.g 'eslint'. By default all linters "
+                  "are run for all the appropriate files.",
+          }],
+        [['-f', '--format'],
+         {'dest': 'fmt',
+          'default': 'stylish',
+          'help': "Formatter to use. Defaults to 'stylish'.",
+          }],
+        [['-n', '--no-filter'],
+         {'dest': 'use_filters',
+          'default': True,
+          'action': 'store_false',
+          'help': "Ignore all filtering. This is useful for quickly "
+                  "testing a directory that otherwise wouldn't be run, "
+                  "without needing to modify the config file.",
+          }],
+        [['-r', '--rev'],
+         {'default': None,
+          'help': "Lint files touched by the given revision(s). Works with "
+                  "mercurial or git."
+          }],
+        [['-w', '--workdir'],
+         {'default': False,
+          'action': 'store_true',
+          'help': "Lint files touched by changes in the working directory "
+                  "(i.e haven't been committed yet). Works with mercurial or git.",
+          }],
+        [['extra_args'],
+         {'nargs': REMAINDER,
+          'help': "Extra arguments that will be forwarded to the underlying linter.",
+          }],
+    ]
+
+    def __init__(self, **kwargs):
+        ArgumentParser.__init__(self, usage=self.__doc__, **kwargs)
+
+        for cli, args in self.arguments:
+            self.add_argument(*cli, **args)
+
+    def parse_known_args(self, *args, **kwargs):
+        # This is here so the eslint mach command doesn't lose 'extra_args'
+        # when using mach's dispatch functionality.
+        args, extra = ArgumentParser.parse_known_args(self, *args, **kwargs)
+        args.extra_args = extra
+        return args, extra
+
+
+def find_linters(linters=None):
+    lints = []
+    for search_path in SEARCH_PATHS:
+        if not os.path.isdir(search_path):
+            continue
+
+        files = os.listdir(search_path)
+        for f in files:
+            name, ext = os.path.splitext(f)
+            if ext != '.lint':
+                continue
+
+            if linters and name not in linters:
+                continue
+
+            lints.append(os.path.join(search_path, f))
+    return lints
+
+
+def run(paths, linters, fmt, rev, workdir, **lintargs):
+    from mozlint import LintRoller, formatters
+
+    lint = LintRoller(**lintargs)
+    lint.read(find_linters(linters))
+
+    # run all linters
+    results = lint.roll(paths, rev=rev, workdir=workdir)
+
+    formatter = formatters.get(fmt)
+
+    # Explicitly utf-8 encode the output as some of the formatters make
+    # use of unicode characters. This will prevent a UnicodeEncodeError
+    # on environments where utf-8 isn't the default
+    print(formatter(results).encode('utf-8', 'replace'))
+    return lint.return_code
+
+
+if __name__ == '__main__':
+    parser = MozlintParser()
+    args = vars(parser.parse_args())
+    sys.exit(run(**args))
diff --git a/python/mozlint/mozlint/errors.py b/python/mozlint/mozlint/errors.py
new file mode 100644
index 000000000..a899a1974
--- /dev/null
+++ b/python/mozlint/mozlint/errors.py
@@ -0,0 +1,25 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+
+
+class LintException(Exception):
+    pass
+
+
+class LinterNotFound(LintException):
+    def __init__(self, path):
+        LintException.__init__(self, "Could not find lint file '{}'".format(path))
+
+
+class LinterParseError(LintException):
+    def __init__(self, path, message):
+        LintException.__init__(self, "{}: {}".format(os.path.basename(path), message))
+
+
+class LintersNotConfigured(LintException):
+    def __init__(self):
+        LintException.__init__(self, "No linters registered! Use `LintRoller.read` "
+                                     "to register a linter.")
diff --git a/python/mozlint/mozlint/formatters/__init__.py b/python/mozlint/mozlint/formatters/__init__.py
new file mode 100644
index 000000000..33aca0446
--- /dev/null
+++ b/python/mozlint/mozlint/formatters/__init__.py
@@ -0,0 +1,25 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+
+from ..result import ResultEncoder
+from .stylish import StylishFormatter
+from .treeherder import TreeherderFormatter
+
+
+class JSONFormatter(object):
+    def __call__(self, results):
+        return json.dumps(results, cls=ResultEncoder)
+
+
+all_formatters = {
+    'json': JSONFormatter,
+    'stylish': StylishFormatter,
+    'treeherder': TreeherderFormatter,
+}
+
+
+def get(name, **fmtargs):
+    return all_formatters[name](**fmtargs)
diff --git a/python/mozlint/mozlint/formatters/stylish.py b/python/mozlint/mozlint/formatters/stylish.py
new file mode 100644
index 000000000..62ddfbeb6
--- /dev/null
+++ b/python/mozlint/mozlint/formatters/stylish.py
@@ -0,0 +1,122 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+from ..result import ResultContainer
+
+try:
+    import blessings
+except ImportError:
+    blessings = None
+
+
+class NullTerminal(object):
+    """Replacement for `blessings.Terminal()` that does no formatting."""
+    class NullCallableString(unicode):
+        """A dummy callable Unicode stolen from blessings"""
+        def __new__(cls):
+            new = unicode.__new__(cls, u'')
+            return new
+
+        def __call__(self, *args):
+            if len(args) != 1 or isinstance(args[0], int):
+                return u''
+            return args[0]
+
+    def __getattr__(self, attr):
+        return self.NullCallableString()
+
+
+class StylishFormatter(object):
+    """Formatter based on the eslint default."""
+
+    # Colors later on in the list are fallbacks in case the terminal
+    # doesn't support colors earlier in the list.
+    # See http://www.calmar.ws/vim/256-xterm-24bit-rgb-color-chart.html
+    _colors = {
+        'grey': [247, 8, 7],
+        'red': [1],
+        'yellow': [3],
+        'brightred': [9, 1],
+        'brightyellow': [11, 3],
+    }
+    fmt = "  {c1}{lineno}{column}  {c2}{level}{normal}  {message}  {c1}{rule}({linter}){normal}"
+    fmt_summary = "{t.bold}{c}\u2716 {problem} ({error}, {warning}){t.normal}"
+
+    def __init__(self, disable_colors=None):
+        if disable_colors or not blessings:
+            self.term = NullTerminal()
+        else:
+            self.term = blessings.Terminal()
+        self.num_colors = self.term.number_of_colors
+
+    def color(self, color):
+        for num in self._colors[color]:
+            if num < self.num_colors:
+                return self.term.color(num)
+        return ''
+
+    def _reset_max(self):
+        self.max_lineno = 0
+        self.max_column = 0
+        self.max_level = 0
+        self.max_message = 0
+
+    def _update_max(self, err):
+        """Calculates the longest length of each token for spacing."""
+        self.max_lineno = max(self.max_lineno, len(str(err.lineno)))
+        if err.column:
+            self.max_column = max(self.max_column, len(str(err.column)))
+        self.max_level = max(self.max_level, len(str(err.level)))
+        self.max_message = max(self.max_message, len(err.message))
+
+    def _pluralize(self, s, num):
+        if num != 1:
+            s += 's'
+        return str(num) + ' ' + s
+
+    def __call__(self, result):
+        message = []
+
+        num_errors = 0
+        num_warnings = 0
+        for path, errors in sorted(result.iteritems()):
+            self._reset_max()
+
+            message.append(self.term.underline(path))
+            # Do a first pass to calculate required padding
+            for err in errors:
+                assert isinstance(err, ResultContainer)
+                self._update_max(err)
+                if err.level == 'error':
+                    num_errors += 1
+                else:
+                    num_warnings += 1
+
+            for err in errors:
+                message.append(self.fmt.format(
+                    normal=self.term.normal,
+                    c1=self.color('grey'),
+                    c2=self.color('red') if err.level == 'error' else self.color('yellow'),
+                    lineno=str(err.lineno).rjust(self.max_lineno),
+                    column=(":" + str(err.column).ljust(self.max_column)) if err.column else "",
+                    level=err.level.ljust(self.max_level),
+                    message=err.message.ljust(self.max_message),
+                    rule='{} '.format(err.rule) if err.rule else '',
+                    linter=err.linter.lower(),
+                ))
+
+            message.append('')  # newline
+
+        # Print a summary
+        message.append(self.fmt_summary.format(
+            t=self.term,
+            c=self.color('brightred') if num_errors else self.color('brightyellow'),
+            problem=self._pluralize('problem', num_errors + num_warnings),
+            error=self._pluralize('error', num_errors),
+            warning=self._pluralize('warning', num_warnings),
+        ))
+
+        return '\n'.join(message)
diff --git a/python/mozlint/mozlint/formatters/treeherder.py b/python/mozlint/mozlint/formatters/treeherder.py
new file mode 100644
index 000000000..7c27011cf
--- /dev/null
+++ b/python/mozlint/mozlint/formatters/treeherder.py
@@ -0,0 +1,31 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+from ..result import ResultContainer
+
+
+class TreeherderFormatter(object):
+    """Formatter for treeherder friendly output.
+
+    This formatter looks ugly, but prints output such that
+    treeherder is able to highlight the errors and warnings.
+    This is a stop-gap until bug 1276486 is fixed.
+    """
+    fmt = "TEST-UNEXPECTED-{level} | {path}:{lineno}{column} | {message} ({rule})"
+
+    def __call__(self, result):
+        message = []
+        for path, errors in sorted(result.iteritems()):
+            for err in errors:
+                assert isinstance(err, ResultContainer)
+
+                d = {s: getattr(err, s) for s in err.__slots__}
+                d["column"] = ":%s" % d["column"] if d["column"] else ""
+                d['level'] = d['level'].upper()
+                d['rule'] = d['rule'] or d['linter']
+                message.append(self.fmt.format(**d))
+
+        return "\n".join(message)
diff --git a/python/mozlint/mozlint/parser.py b/python/mozlint/mozlint/parser.py
new file mode 100644
index 000000000..f350d0de7
--- /dev/null
+++ b/python/mozlint/mozlint/parser.py
@@ -0,0 +1,85 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import imp
+import os
+import sys
+import uuid
+
+from .types import supported_types
+from .errors import LinterNotFound, LinterParseError
+
+
+class Parser(object):
+    """Reads and validates `.lint` files."""
+    required_attributes = (
+        'name',
+        'description',
+        'type',
+        'payload',
+    )
+
+    def __call__(self, path):
+        return self.parse(path)
+
+    def _load_linter(self, path):
+        # Ensure parent module is present otherwise we'll (likely) get
+        # an error due to unknown parent.
+        parent_module = 'mozlint.linters'
+        if parent_module not in sys.modules:
+            mod = imp.new_module(parent_module)
+            sys.modules[parent_module] = mod
+
+        write_bytecode = sys.dont_write_bytecode
+        sys.dont_write_bytecode = True
+
+        module_name = '{}.{}'.format(parent_module, uuid.uuid1().get_hex())
+        imp.load_source(module_name, path)
+
+        sys.dont_write_bytecode = write_bytecode
+
+        mod = sys.modules[module_name]
+
+        if not hasattr(mod, 'LINTER'):
+            raise LinterParseError(path, "No LINTER definition found!")
+
+        definition = mod.LINTER
+        definition['path'] = path
+        return definition
+
+    def _validate(self, linter):
+        missing_attrs = []
+        for attr in self.required_attributes:
+            if attr not in linter:
+                missing_attrs.append(attr)
+
+        if missing_attrs:
+            raise LinterParseError(linter['path'], "Missing required attribute(s): "
+                                                   "{}".format(','.join(missing_attrs)))
+
+        if linter['type'] not in supported_types:
+            raise LinterParseError(linter['path'], "Invalid type '{}'".format(linter['type']))
+
+        for attr in ('include', 'exclude'):
+            if attr in linter and (not isinstance(linter[attr], list) or
+                                   not all(isinstance(a, basestring) for a in linter[attr])):
+                raise LinterParseError(linter['path'], "The {} directive must be a "
+                                                       "list of strings!".format(attr))
+
+    def parse(self, path):
+        """Read a linter and return its LINTER definition.
+
+        :param path: Path to the linter.
+        :returns: Linter definition (dict)
+        :raises: LinterNotFound, LinterParseError
+        """
+        if not os.path.isfile(path):
+            raise LinterNotFound(path)
+
+        if not path.endswith('.lint'):
+            raise LinterParseError(path, "Invalid filename, linters must end with '.lint'!")
+
+        linter = self._load_linter(path)
+        self._validate(linter)
+        return linter
diff --git a/python/mozlint/mozlint/pathutils.py b/python/mozlint/mozlint/pathutils.py
new file mode 100644
index 000000000..532904dca
--- /dev/null
+++ b/python/mozlint/mozlint/pathutils.py
@@ -0,0 +1,156 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+import os
+
+from mozpack import path as mozpath
+from mozpack.files import FileFinder
+
+
+class FilterPath(object):
+    """Helper class to make comparing and matching file paths easier."""
+    def __init__(self, path, exclude=None):
+        self.path = os.path.normpath(path)
+        self._finder = None
+        self.exclude = exclude
+
+    @property
+    def finder(self):
+        if self._finder:
+            return self._finder
+        self._finder = FileFinder(
+            self.path, find_executables=False, ignore=self.exclude)
+        return self._finder
+
+    @property
+    def ext(self):
+        return os.path.splitext(self.path)[1]
+
+    @property
+    def exists(self):
+        return os.path.exists(self.path)
+
+    @property
+    def isfile(self):
+        return os.path.isfile(self.path)
+
+    @property
+    def isdir(self):
+        return os.path.isdir(self.path)
+
+    def join(self, *args):
+        return FilterPath(os.path.join(self, *args))
+
+    def match(self, patterns):
+        return any(mozpath.match(self.path, pattern.path) for pattern in patterns)
+
+    def contains(self, other):
+        """Return True if other is a subdirectory of self or equals self."""
+        if isinstance(other, FilterPath):
+            other = other.path
+        a = os.path.abspath(self.path)
+        b = os.path.normpath(os.path.abspath(other))
+
+        if b.startswith(a):
+            return True
+        return False
+
+    def __repr__(self):
+        return repr(self.path)
+
+
+def filterpaths(paths, linter, **lintargs):
+    """Filters a list of paths.
+
+    Given a list of paths, and a linter definition plus extra
+    arguments, return the set of paths that should be linted.
+
+    :param paths: A starting list of paths to possibly lint.
+    :param linter: A linter definition.
+    :param lintargs: Extra arguments passed to the linter.
+    :returns: A list of file paths to lint.
+    """
+    include = linter.get('include', [])
+    exclude = lintargs.get('exclude', [])
+    exclude.extend(linter.get('exclude', []))
+    root = lintargs['root']
+
+    if not lintargs.get('use_filters', True) or (not include and not exclude):
+        return paths
+
+    def normalize(path):
+        if not os.path.isabs(path):
+            path = os.path.join(root, path)
+        return FilterPath(path)
+
+    include = map(normalize, include)
+    exclude = map(normalize, exclude)
+
+    # Paths with and without globs will be handled separately,
+    # pull them apart now.
+    includepaths = [p for p in include if p.exists]
+    excludepaths = [p for p in exclude if p.exists]
+
+    includeglobs = [p for p in include if not p.exists]
+    excludeglobs = [p for p in exclude if not p.exists]
+
+    extensions = linter.get('extensions')
+    keep = set()
+    discard = set()
+    for path in map(FilterPath, paths):
+        # Exclude bad file extensions
+        if extensions and path.isfile and path.ext not in extensions:
+            continue
+
+        if path.match(excludeglobs):
+            continue
+
+        # First handle include/exclude directives
+        # that exist (i.e don't have globs)
+        for inc in includepaths:
+            # Only excludes that are subdirectories of the include
+            # path matter.
+            excs = [e for e in excludepaths if inc.contains(e)]
+
+            if path.contains(inc):
+                # If specified path is an ancestor of include path,
+                # then lint the include path.
+                keep.add(inc)
+
+                # We can't apply these exclude paths without explicitly
+                # including every sibling file. Rather than do that,
+                # just return them and hope the underlying linter will
+                # deal with them.
+                discard.update(excs)
+
+            elif inc.contains(path):
+                # If the include path is an ancestor of the specified
+                # path, then add the specified path only if there are
+                # no exclude paths in-between them.
+                if not any(e.contains(path) for e in excs):
+                    keep.add(path)
+
+        # Next handle include/exclude directives that
+        # contain globs.
+        if path.isfile:
+            # If the specified path is a file it must be both
+            # matched by an include directive and not matched
+            # by an exclude directive.
+            if not path.match(includeglobs):
+                continue
+
+            keep.add(path)
+        elif path.isdir:
+            # If the specified path is a directory, use a
+            # FileFinder to resolve all relevant globs.
+            path.exclude = [e.path for e in excludeglobs]
+            for pattern in includeglobs:
+                for p, f in path.finder.find(pattern.path):
+                    keep.add(path.join(p))
+
+    # Only pass paths we couldn't exclude here to the underlying linter
+    lintargs['exclude'] = [f.path for f in discard]
+    return [f.path for f in keep]
diff --git a/python/mozlint/mozlint/result.py b/python/mozlint/mozlint/result.py
new file mode 100644
index 000000000..0c56f1d76
--- /dev/null
+++ b/python/mozlint/mozlint/result.py
@@ -0,0 +1,88 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from json import dumps, JSONEncoder
+
+
+class ResultContainer(object):
+    """Represents a single lint error and its related metadata.
+
+    :param linter: name of the linter that flagged this error
+    :param path: path to the file containing the error
+    :param message: text describing the error
+    :param lineno: line number that contains the error
+    :param column: column containing the error
+    :param level: severity of the error, either 'warning' or 'error' (default 'error')
+    :param hint: suggestion for fixing the error (optional)
+    :param source: source code context of the error (optional)
+    :param rule: name of the rule that was violated (optional)
+    :param lineoffset: denotes an error spans multiple lines, of the form
+                       (<lineno offset>, <num lines>) (optional)
+    """
+
+    __slots__ = (
+        'linter',
+        'path',
+        'message',
+        'lineno',
+        'column',
+        'hint',
+        'source',
+        'level',
+        'rule',
+        'lineoffset',
+    )
+
+    def __init__(self, linter, path, message, lineno, column=None, hint=None,
+                 source=None, level=None, rule=None, lineoffset=None):
+        self.path = path
+        self.message = message
+        self.lineno = lineno
+        self.column = column
+        self.hint = hint
+        self.source = source
+        self.level = level or 'error'
+        self.linter = linter
+        self.rule = rule
+        self.lineoffset = lineoffset
+
+    def __repr__(self):
+        s = dumps(self, cls=ResultEncoder, indent=2)
+        return "ResultContainer({})".format(s)
+
+
+class ResultEncoder(JSONEncoder):
+    """Class for encoding :class:`~result.ResultContainer`s to json.
+
+    Usage:
+
+        json.dumps(results, cls=ResultEncoder)
+    """
+    def default(self, o):
+        if isinstance(o, ResultContainer):
+            return {a: getattr(o, a) for a in o.__slots__}
+        return JSONEncoder.default(self, o)
+
+
+def from_linter(lintobj, **kwargs):
+    """Create a :class:`~result.ResultContainer` from a LINTER definition.
+
+    Convenience method that pulls defaults from a LINTER
+    definition and forwards them.
+
+    :param lintobj: LINTER obj as defined in a .lint file
+    :param kwargs: same as :class:`~result.ResultContainer`
+    :returns: :class:`~result.ResultContainer` object
+    """
+    attrs = {}
+    for attr in ResultContainer.__slots__:
+        attrs[attr] = kwargs.get(attr, lintobj.get(attr))
+
+    if not attrs['linter']:
+        attrs['linter'] = lintobj.get('name')
+
+    if not attrs['message']:
+        attrs['message'] = lintobj.get('description')
+
+    return ResultContainer(**attrs)
diff --git a/python/mozlint/mozlint/roller.py b/python/mozlint/mozlint/roller.py
new file mode 100644
index 000000000..2d1608dd8
--- /dev/null
+++ b/python/mozlint/mozlint/roller.py
@@ -0,0 +1,154 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+import os
+import signal
+import sys
+import traceback
+from collections import defaultdict
+from Queue import Empty
+from multiprocessing import (
+    Manager,
+    Pool,
+    cpu_count,
+)
+
+from .errors import LintersNotConfigured
+from .types import supported_types
+from .parser import Parser
+from .vcs import VCSFiles
+
+
+def _run_linters(queue, paths, **lintargs):
+    parse = Parser()
+    results = defaultdict(list)
+    return_code = 0
+
+    while True:
+        try:
+            # The astute reader may wonder what is preventing the worker from
+            # grabbing the next linter from the queue after a SIGINT. Because
+            # this is a Manager.Queue(), it is itself in a child process which
+            # also received SIGINT. By the time the worker gets back here, the
+            # Queue is dead and IOError is raised.
+            linter_path = queue.get(False)
+        except (Empty, IOError):
+            return results, return_code
+
+        # Ideally we would pass the entire LINTER definition as an argument
+        # to the worker instead of re-parsing it. But passing a function from
+        # a dynamically created module (with imp) does not seem to be possible
+        # with multiprocessing on Windows.
+        linter = parse(linter_path)
+        func = supported_types[linter['type']]
+        res = func(paths, linter, **lintargs) or []
+
+        if not isinstance(res, (list, tuple)):
+            if res:
+                return_code = 1
+            continue
+
+        for r in res:
+            results[r.path].append(r)
+
+
+def _run_worker(*args, **lintargs):
+    try:
+        return _run_linters(*args, **lintargs)
+    except Exception:
+        # multiprocessing seems to munge worker exceptions, print
+        # it here so it isn't lost.
+        traceback.print_exc()
+        raise
+    finally:
+        sys.stdout.flush()
+
+
+class LintRoller(object):
+    """Registers and runs linters.
+
+    :param root: Path to which relative paths will be joined. If
+                 unspecified, root will either be determined from
+                 version control or cwd.
+    :param lintargs: Arguments to pass to the underlying linter(s).
+    """
+
+    def __init__(self, root=None, **lintargs):
+        self.parse = Parser()
+        self.vcs = VCSFiles()
+
+        self.linters = []
+        self.lintargs = lintargs
+        self.lintargs['root'] = root or self.vcs.root or os.getcwd()
+
+        self.return_code = None
+
+    def read(self, paths):
+        """Parse one or more linters and add them to the registry.
+
+        :param paths: A path or iterable of paths to linter definitions.
+        """
+        if isinstance(paths, basestring):
+            paths = (paths,)
+
+        for path in paths:
+            self.linters.append(self.parse(path))
+
+    def roll(self, paths=None, rev=None, workdir=None, num_procs=None):
+        """Run all of the registered linters against the specified file paths.
+
+        :param paths: An iterable of files and/or directories to lint.
+        :param rev: Lint all files touched by the specified revision.
+        :param workdir: Lint all files touched in the working directory.
+        :param num_procs: The number of processes to use. Default: cpu count
+        :return: A dictionary with file names as the key, and a list of
+                 :class:`~result.ResultContainer`s as the value.
+        """
+        paths = paths or []
+        if isinstance(paths, basestring):
+            paths = [paths]
+
+        if not self.linters:
+            raise LintersNotConfigured
+
+        # Calculate files from VCS
+        if rev:
+            paths.extend(self.vcs.by_rev(rev))
+        if workdir:
+            paths.extend(self.vcs.by_workdir())
+        paths = paths or ['.']
+        paths = map(os.path.abspath, paths)
+
+        # Set up multiprocessing
+        m = Manager()
+        queue = m.Queue()
+
+        for linter in self.linters:
+            queue.put(linter['path'])
+
+        num_procs = num_procs or cpu_count()
+        num_procs = min(num_procs, len(self.linters))
+        pool = Pool(num_procs)
+
+        all_results = defaultdict(list)
+        workers = []
+        for i in range(num_procs):
+            workers.append(
+                pool.apply_async(_run_worker, args=(queue, paths), kwds=self.lintargs))
+        pool.close()
+
+        # ignore SIGINT in parent so we can still get partial results
+        # from child processes. These should shutdown quickly anyway.
+        signal.signal(signal.SIGINT, signal.SIG_IGN)
+        self.return_code = 0
+        for worker in workers:
+            # parent process blocks on worker.get()
+            results, return_code = worker.get()
+            if results or return_code:
+                self.return_code = 1
+            for k, v in results.iteritems():
+                all_results[k].extend(v)
+        return all_results
diff --git a/python/mozlint/mozlint/types.py b/python/mozlint/mozlint/types.py
new file mode 100644
index 000000000..2f49ae2bf
--- /dev/null
+++ b/python/mozlint/mozlint/types.py
@@ -0,0 +1,142 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+import re
+import sys
+from abc import ABCMeta, abstractmethod
+
+from mozlog import get_default_logger, commandline, structuredlog
+from mozlog.reader import LogHandler
+
+from . import result
+from .pathutils import filterpaths
+
+
+class BaseType(object):
+    """Abstract base class for all types of linters."""
+    __metaclass__ = ABCMeta
+    batch = False
+
+    def __call__(self, paths, linter, **lintargs):
+        """Run `linter` against `paths` with `lintargs`.
+
+        :param paths: Paths to lint. Can be a file or directory.
+        :param linter: Linter definition paths are being linted against.
+        :param lintargs: External arguments to the linter not defined in
+                         the definition, but passed in by a consumer.
+        :returns: A list of :class:`~result.ResultContainer` objects.
+        """
+        paths = filterpaths(paths, linter, **lintargs)
+        if not paths:
+            print("{}: no files to lint in specified paths".format(linter['name']))
+            return
+
+        if self.batch:
+            return self._lint(paths, linter, **lintargs)
+
+        errors = []
+        try:
+            for p in paths:
+                result = self._lint(p, linter, **lintargs)
+                if result:
+                    errors.extend(result)
+        except KeyboardInterrupt:
+            pass
+        return errors
+
+    @abstractmethod
+    def _lint(self, path):
+        pass
+
+
+class LineType(BaseType):
+    """Abstract base class for linter types that check each line individually.
+
+    Subclasses of this linter type will read each file and check the provided
+    payload against each line one by one.
+    """
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def condition(payload, line):
+        pass
+
+    def _lint(self, path, linter, **lintargs):
+        payload = linter['payload']
+
+        with open(path, 'r') as fh:
+            lines = fh.readlines()
+
+        errors = []
+        for i, line in enumerate(lines):
+            if self.condition(payload, line):
+                errors.append(result.from_linter(linter, path=path, lineno=i+1))
+
+        return errors
+
+
+class StringType(LineType):
+    """Linter type that checks whether a substring is found."""
+
+    def condition(self, payload, line):
+        return payload in line
+
+
+class RegexType(LineType):
+    """Linter type that checks whether a regex match is found."""
+
+    def condition(self, payload, line):
+        return re.search(payload, line)
+
+
+class ExternalType(BaseType):
+    """Linter type that runs an external function.
+
+    The function is responsible for properly formatting the results
+    into a list of :class:`~result.ResultContainer` objects.
+    """
+    batch = True
+
+    def _lint(self, files, linter, **lintargs):
+        payload = linter['payload']
+        return payload(files, **lintargs)
+
+
+class LintHandler(LogHandler):
+    def __init__(self, linter):
+        self.linter = linter
+        self.results = []
+
+    def lint(self, data):
+        self.results.append(result.from_linter(self.linter, **data))
+
+
+class StructuredLogType(BaseType):
+    batch = True
+
+    def _lint(self, files, linter, **lintargs):
+        payload = linter["payload"]
+        handler = LintHandler(linter)
+        logger = linter.get("logger")
+        if logger is None:
+            logger = get_default_logger()
+        if logger is None:
+            logger = structuredlog.StructuredLogger(linter["name"])
+            commandline.setup_logging(logger, {}, {"mach": sys.stdout})
+        logger.add_handler(handler)
+        try:
+            payload(files, logger, **lintargs)
+        except KeyboardInterrupt:
+            pass
+        return handler.results
+
+supported_types = {
+    'string': StringType(),
+    'regex': RegexType(),
+    'external': ExternalType(),
+    'structured_log': StructuredLogType()
+}
+"""Mapping of type string to an associated instance."""
diff --git a/python/mozlint/mozlint/vcs.py b/python/mozlint/mozlint/vcs.py
new file mode 100644
index 000000000..6a118f2e6
--- /dev/null
+++ b/python/mozlint/mozlint/vcs.py
@@ -0,0 +1,62 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import subprocess
+
+
+class VCSFiles(object):
+    def __init__(self):
+        self._root = None
+        self._vcs = None
+
+    @property
+    def root(self):
+        if self._root:
+            return self._root
+
+        # First check if we're in an hg repo, if not try git
+        commands = (
+            ['hg', 'root'],
+            ['git', 'rev-parse', '--show-toplevel'],
+        )
+
+        for cmd in commands:
+            proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            output = proc.communicate()[0].strip()
+
+            if proc.returncode == 0:
+                self._vcs = cmd[0]
+                self._root = output
+                return self._root
+
+    @property
+    def vcs(self):
+        return self._vcs or (self.root and self._vcs)
+
+    @property
+    def is_hg(self):
+        return self.vcs == 'hg'
+
+    @property
+    def is_git(self):
+        return self.vcs == 'git'
+
+    def _run(self, cmd):
+        files = subprocess.check_output(cmd).split()
+        return [os.path.join(self.root, f) for f in files]
+
+    def by_rev(self, rev):
+        if self.is_hg:
+            return self._run(['hg', 'log', '--template', '{files % "\\n{file}"}', '-r', rev])
+        elif self.is_git:
+            return self._run(['git', 'diff', '--name-only', rev])
+        return []
+
+    def by_workdir(self):
+        if self.is_hg:
+            return self._run(['hg', 'status', '-amn'])
+        elif self.is_git:
+            return self._run(['git', 'diff', '--name-only'])
+        return []
diff --git a/python/mozlint/setup.py b/python/mozlint/setup.py
new file mode 100644
index 000000000..62d25c38b
--- /dev/null
+++ b/python/mozlint/setup.py
@@ -0,0 +1,26 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from setuptools import setup
+
+VERSION = 0.1
+DEPS = ["mozlog>=3.4"]
+
+setup(
+    name='mozlint',
+    description='Framework for registering and running micro lints',
+    license='MPL 2.0',
+    author='Andrew Halberstadt',
+    author_email='ahalberstadt@mozilla.com',
+    url='',
+    packages=['mozlint'],
+    version=VERSION,
+    classifiers=[
+        'Environment :: Console',
+        'Development Status :: 3 - Alpha',
+        'License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)',
+        'Natural Language :: English',
+    ],
+    install_requires=DEPS,
+)
diff --git a/python/mozlint/test/__init__.py b/python/mozlint/test/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/python/mozlint/test/conftest.py b/python/mozlint/test/conftest.py
new file mode 100644
index 000000000..e171798b0
--- /dev/null
+++ b/python/mozlint/test/conftest.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+
+import pytest
+
+from mozlint import LintRoller
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+
+@pytest.fixture
+def lint(request):
+    lintargs = getattr(request.module, 'lintargs', {})
+    return LintRoller(root=here, **lintargs)
+
+
+@pytest.fixture(scope='session')
+def filedir():
+    return os.path.join(here, 'files')
+
+
+@pytest.fixture(scope='module')
+def files(filedir, request):
+    suffix_filter = getattr(request.module, 'files', [''])
+    return [os.path.join(filedir, p) for p in os.listdir(filedir)
+            if any(p.endswith(suffix) for suffix in suffix_filter)]
+
+
+@pytest.fixture(scope='session')
+def lintdir():
+    return os.path.join(here, 'linters')
+
+
+@pytest.fixture(scope='module')
+def linters(lintdir, request):
+    suffix_filter = getattr(request.module, 'linters', ['.lint'])
+    return [os.path.join(lintdir, p) for p in os.listdir(lintdir)
+            if any(p.endswith(suffix) for suffix in suffix_filter)]
diff --git a/python/mozlint/test/files/foobar.js b/python/mozlint/test/files/foobar.js
new file mode 100644
index 000000000..d9754d0a2
--- /dev/null
+++ b/python/mozlint/test/files/foobar.js
@@ -0,0 +1,2 @@
+// Oh no.. we called this variable foobar, bad!
+var foobar = "a string";
diff --git a/python/mozlint/test/files/foobar.py b/python/mozlint/test/files/foobar.py
new file mode 100644
index 000000000..e1677b3fd
--- /dev/null
+++ b/python/mozlint/test/files/foobar.py
@@ -0,0 +1,2 @@
+# Oh no.. we called this variable foobar, bad!
+foobar = "a string"
diff --git a/python/mozlint/test/files/no_foobar.js b/python/mozlint/test/files/no_foobar.js
new file mode 100644
index 000000000..6b95d646c
--- /dev/null
+++ b/python/mozlint/test/files/no_foobar.js
@@ -0,0 +1,2 @@
+// What a relief
+var properlyNamed = "a string";
diff --git a/python/mozlint/test/linters/badreturncode.lint b/python/mozlint/test/linters/badreturncode.lint
new file mode 100644
index 000000000..398d51a55
--- /dev/null
+++ b/python/mozlint/test/linters/badreturncode.lint
@@ -0,0 +1,21 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+def lint(files, **lintargs):
+    return 1
+
+
+LINTER = {
+    'name': "BadReturnCodeLinter",
+    'description': "Returns an error code no matter what",
+    'include': [
+        'files',
+    ],
+    'type': 'external',
+    'extensions': ['.js', '.jsm'],
+    'payload': lint,
+}
diff --git a/python/mozlint/test/linters/explicit_path.lint b/python/mozlint/test/linters/explicit_path.lint
new file mode 100644
index 000000000..8c1a88a1f
--- /dev/null
+++ b/python/mozlint/test/linters/explicit_path.lint
@@ -0,0 +1,13 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "ExplicitPathLinter",
+    'description': "Only lint a specific file name",
+    'rule': 'no-foobar',
+    'include': [
+        'no_foobar.js',
+    ],
+    'type': 'string',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/external.lint b/python/mozlint/test/linters/external.lint
new file mode 100644
index 000000000..dcae419db
--- /dev/null
+++ b/python/mozlint/test/linters/external.lint
@@ -0,0 +1,30 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from mozlint import result
+
+
+def lint(files, **lintargs):
+    results = []
+    for path in files:
+        with open(path, 'r') as fh:
+            for i, line in enumerate(fh.readlines()):
+                if 'foobar' in line:
+                    results.append(result.from_linter(
+                        LINTER, path=path, lineno=i+1, column=1, rule="no-foobar"))
+    return results
+
+
+LINTER = {
+    'name': "ExternalLinter",
+    'description': "It's bad to have the string foobar in js files.",
+    'include': [
+        'files',
+    ],
+    'type': 'external',
+    'extensions': ['.js', '.jsm'],
+    'payload': lint,
+}
diff --git a/python/mozlint/test/linters/invalid_exclude.lint b/python/mozlint/test/linters/invalid_exclude.lint
new file mode 100644
index 000000000..be6d0045c
--- /dev/null
+++ b/python/mozlint/test/linters/invalid_exclude.lint
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "BadExcludeLinter",
+    'description': "Has an invalid exclude directive.",
+    'exclude': [0, 1],  # should be a list of strings
+    'type': 'string',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/invalid_extension.lnt b/python/mozlint/test/linters/invalid_extension.lnt
new file mode 100644
index 000000000..3cb8153a0
--- /dev/null
+++ b/python/mozlint/test/linters/invalid_extension.lnt
@@ -0,0 +1,9 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "BadExtensionLinter",
+    'description': "Has an invalid file extension.",
+    'type': 'string',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/invalid_include.lint b/python/mozlint/test/linters/invalid_include.lint
new file mode 100644
index 000000000..343d5e195
--- /dev/null
+++ b/python/mozlint/test/linters/invalid_include.lint
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "BadIncludeLinter",
+    'description': "Has an invalid include directive.",
+    'include': 'should be a list',
+    'type': 'string',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/invalid_type.lint b/python/mozlint/test/linters/invalid_type.lint
new file mode 100644
index 000000000..9e5926c5a
--- /dev/null
+++ b/python/mozlint/test/linters/invalid_type.lint
@@ -0,0 +1,9 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "BadTypeLinter",
+    'description': "Has an invalid type.",
+    'type': 'invalid',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/missing_attrs.lint b/python/mozlint/test/linters/missing_attrs.lint
new file mode 100644
index 000000000..380512b64
--- /dev/null
+++ b/python/mozlint/test/linters/missing_attrs.lint
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "MissingAttrsLinter",
+    'description': "Missing type and payload",
+}
diff --git a/python/mozlint/test/linters/missing_definition.lint b/python/mozlint/test/linters/missing_definition.lint
new file mode 100644
index 000000000..a84b305d2
--- /dev/null
+++ b/python/mozlint/test/linters/missing_definition.lint
@@ -0,0 +1,4 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+# No LINTER variable
diff --git a/python/mozlint/test/linters/raises.lint b/python/mozlint/test/linters/raises.lint
new file mode 100644
index 000000000..f17e18733
--- /dev/null
+++ b/python/mozlint/test/linters/raises.lint
@@ -0,0 +1,19 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from mozlint.errors import LintException
+
+
+def lint(files, **lintargs):
+    raise LintException("Oh no something bad happened!")
+
+
+LINTER = {
+    'name': "RaisesLinter",
+    'description': "Raises an exception",
+    'type': 'external',
+    'payload': lint,
+}
diff --git a/python/mozlint/test/linters/regex.lint b/python/mozlint/test/linters/regex.lint
new file mode 100644
index 000000000..439cadf36
--- /dev/null
+++ b/python/mozlint/test/linters/regex.lint
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "RegexLinter",
+    'description': "Make sure the string 'foobar' never appears "
+                   "in a js variable file because it is bad.",
+    'rule': 'no-foobar',
+    'include': [
+        '**/*.js',
+        '**/*.jsm',
+    ],
+    'type': 'regex',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/string.lint b/python/mozlint/test/linters/string.lint
new file mode 100644
index 000000000..46bf0e8b8
--- /dev/null
+++ b/python/mozlint/test/linters/string.lint
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+
+LINTER = {
+    'name': "StringLinter",
+    'description': "Make sure the string 'foobar' never appears "
+                   "in browser js files because it is bad.",
+    'rule': 'no-foobar',
+    'include': [
+        '**/*.js',
+        '**/*.jsm',
+    ],
+    'type': 'string',
+    'payload': 'foobar',
+}
diff --git a/python/mozlint/test/linters/structured.lint b/python/mozlint/test/linters/structured.lint
new file mode 100644
index 000000000..e8be8d7b3
--- /dev/null
+++ b/python/mozlint/test/linters/structured.lint
@@ -0,0 +1,28 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+def lint(files, logger, **kwargs):
+    for path in files:
+        with open(path, 'r') as fh:
+            for i, line in enumerate(fh.readlines()):
+                if 'foobar' in line:
+                    logger.lint_error(path=path,
+                                      lineno=i+1,
+                                      column=1,
+                                      rule="no-foobar")
+
+
+LINTER = {
+    'name': "StructuredLinter",
+    'description': "It's bad to have the string foobar in js files.",
+    'include': [
+        'files',
+    ],
+    'type': 'structured_log',
+    'extensions': ['.js', '.jsm'],
+    'payload': lint,
+}
diff --git a/python/mozlint/test/test_formatters.py b/python/mozlint/test/test_formatters.py
new file mode 100644
index 000000000..b9e6512b2
--- /dev/null
+++ b/python/mozlint/test/test_formatters.py
@@ -0,0 +1,90 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import unicode_literals
+
+import json
+import sys
+from collections import defaultdict
+
+import pytest
+
+from mozlint import ResultContainer
+from mozlint import formatters
+
+
+@pytest.fixture
+def results(scope='module'):
+    containers = (
+        ResultContainer(
+            linter='foo',
+            path='a/b/c.txt',
+            message="oh no foo",
+            lineno=1,
+        ),
+        ResultContainer(
+            linter='bar',
+            path='d/e/f.txt',
+            message="oh no bar",
+            hint="try baz instead",
+            level='warning',
+            lineno=4,
+            column=2,
+            rule="bar-not-allowed",
+        ),
+        ResultContainer(
+            linter='baz',
+            path='a/b/c.txt',
+            message="oh no baz",
+            lineno=4,
+            source="if baz:",
+        ),
+    )
+    results = defaultdict(list)
+    for c in containers:
+        results[c.path].append(c)
+    return results
+
+
+def test_stylish_formatter(results):
+    expected = """
+a/b/c.txt
+  1  error  oh no foo  (foo)
+  4  error  oh no baz  (baz)
+
+d/e/f.txt
+  4:2  warning  oh no bar  bar-not-allowed (bar)
+
+\u2716 3 problems (2 errors, 1 warning)
+""".strip()
+
+    fmt = formatters.get('stylish', disable_colors=True)
+    assert expected == fmt(results)
+
+
+def test_treeherder_formatter(results):
+    expected = """
+TEST-UNEXPECTED-ERROR | a/b/c.txt:1 | oh no foo (foo)
+TEST-UNEXPECTED-ERROR | a/b/c.txt:4 | oh no baz (baz)
+TEST-UNEXPECTED-WARNING | d/e/f.txt:4:2 | oh no bar (bar-not-allowed)
+""".strip()
+
+    fmt = formatters.get('treeherder')
+    assert expected == fmt(results)
+
+
+def test_json_formatter(results):
+    fmt = formatters.get('json')
+    formatted = json.loads(fmt(results))
+
+    assert set(formatted.keys()) == set(results.keys())
+
+    slots = ResultContainer.__slots__
+    for errors in formatted.values():
+        for err in errors:
+            assert all(s in err for s in slots)
+
+
+if __name__ == '__main__':
+    sys.exit(pytest.main(['--verbose', __file__]))
diff --git a/python/mozlint/test/test_parser.py b/python/mozlint/test/test_parser.py
new file mode 100644
index 000000000..e18e7a5a9
--- /dev/null
+++ b/python/mozlint/test/test_parser.py
@@ -0,0 +1,55 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+
+import pytest
+
+from mozlint.parser import Parser
+from mozlint.errors import (
+    LinterNotFound,
+    LinterParseError,
+)
+
+
+@pytest.fixture(scope='module')
+def parse(lintdir):
+    parser = Parser()
+
+    def _parse(name):
+        path = os.path.join(lintdir, name)
+        return parser(path)
+    return _parse
+
+
+def test_parse_valid_linter(parse):
+    lintobj = parse('string.lint')
+    assert isinstance(lintobj, dict)
+    assert 'name' in lintobj
+    assert 'description' in lintobj
+    assert 'type' in lintobj
+    assert 'payload' in lintobj
+
+
+@pytest.mark.parametrize('linter', [
+    'invalid_type.lint',
+    'invalid_extension.lnt',
+    'invalid_include.lint',
+    'invalid_exclude.lint',
+    'missing_attrs.lint',
+    'missing_definition.lint',
+])
+def test_parse_invalid_linter(parse, linter):
+    with pytest.raises(LinterParseError):
+        parse(linter)
+
+
+def test_parse_non_existent_linter(parse):
+    with pytest.raises(LinterNotFound):
+        parse('missing_file.lint')
+
+
+if __name__ == '__main__':
+    sys.exit(pytest.main(['--verbose', __file__]))
diff --git a/python/mozlint/test/test_roller.py b/python/mozlint/test/test_roller.py
new file mode 100644
index 000000000..b4b82c346
--- /dev/null
+++ b/python/mozlint/test/test_roller.py
@@ -0,0 +1,82 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+
+import pytest
+
+from mozlint import ResultContainer
+from mozlint.errors import LintersNotConfigured, LintException
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+
+
+linters = ('string.lint', 'regex.lint', 'external.lint')
+
+
+def test_roll_no_linters_configured(lint, files):
+    with pytest.raises(LintersNotConfigured):
+        lint.roll(files)
+
+
+def test_roll_successful(lint, linters, files):
+    lint.read(linters)
+
+    result = lint.roll(files)
+    assert len(result) == 1
+    assert lint.return_code == 1
+
+    path = result.keys()[0]
+    assert os.path.basename(path) == 'foobar.js'
+
+    errors = result[path]
+    assert isinstance(errors, list)
+    assert len(errors) == 6
+
+    container = errors[0]
+    assert isinstance(container, ResultContainer)
+    assert container.rule == 'no-foobar'
+
+
+def test_roll_catch_exception(lint, lintdir, files):
+    lint.read(os.path.join(lintdir, 'raises.lint'))
+
+    # suppress printed traceback from test output
+    old_stderr = sys.stderr
+    sys.stderr = open(os.devnull, 'w')
+    with pytest.raises(LintException):
+        lint.roll(files)
+    sys.stderr = old_stderr
+
+
+def test_roll_with_excluded_path(lint, linters, files):
+    lint.lintargs.update({'exclude': ['**/foobar.js']})
+
+    lint.read(linters)
+    result = lint.roll(files)
+
+    assert len(result) == 0
+    assert lint.return_code == 0
+
+
+def test_roll_with_invalid_extension(lint, lintdir, filedir):
+    lint.read(os.path.join(lintdir, 'external.lint'))
+    result = lint.roll(os.path.join(filedir, 'foobar.py'))
+    assert len(result) == 0
+    assert lint.return_code == 0
+
+
+def test_roll_with_failure_code(lint, lintdir, files):
+    lint.read(os.path.join(lintdir, 'badreturncode.lint'))
+
+    assert lint.return_code is None
+    result = lint.roll(files)
+    assert len(result) == 0
+    assert lint.return_code == 1
+
+
+if __name__ == '__main__':
+    sys.exit(pytest.main(['--verbose', __file__]))
diff --git a/python/mozlint/test/test_types.py b/python/mozlint/test/test_types.py
new file mode 100644
index 000000000..ee0ea9b63
--- /dev/null
+++ b/python/mozlint/test/test_types.py
@@ -0,0 +1,50 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import sys
+
+import pytest
+
+from mozlint.result import ResultContainer
+
+
+@pytest.fixture
+def path(filedir):
+    def _path(name):
+        return os.path.join(filedir, name)
+    return _path
+
+
+@pytest.fixture(params=['string.lint', 'regex.lint', 'external.lint', 'structured.lint'])
+def linter(lintdir, request):
+    return os.path.join(lintdir, request.param)
+
+
+def test_linter_types(lint, linter, files, path):
+    lint.read(linter)
+    result = lint.roll(files)
+    assert isinstance(result, dict)
+    assert path('foobar.js') in result
+    assert path('no_foobar.js') not in result
+
+    result = result[path('foobar.js')][0]
+    assert isinstance(result, ResultContainer)
+
+    name = os.path.basename(linter).split('.')[0]
+    assert result.linter.lower().startswith(name)
+
+
+def test_no_filter(lint, lintdir, files):
+    lint.read(os.path.join(lintdir, 'explicit_path.lint'))
+    result = lint.roll(files)
+    assert len(result) == 0
+
+    lint.lintargs['use_filters'] = False
+    result = lint.roll(files)
+    assert len(result) == 2
+
+
+if __name__ == '__main__':
+    sys.exit(pytest.main(['--verbose', __file__]))
-- 
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