This is a bustage fix that needs to get out quickly. Once landed we can take
the time to enable it on more directories, or preferably change it to a
blacklist.
MozReview-Commit-ID: Gbf7q2L0tg3
--HG--
extra : rebase_source : a58ae64c655b24e686710a663d4538b4cfe020f7
The initial motivation for this patch, was to prevent command lines that are
too long on Windows. To that end, there is a cap to the number of paths that
can be run per job. For now that cap is set to 50. This will allow for an
average path length of 160 characters, which should be sufficient with room to
spare.
But another big benefit of this patch is that we are running more things in
parallel. Previously, mozlint ran each linter in its own subprocess, but that's
it. If running eslint is 90% of the work, it'll still only get a single
process. This means we are wasting cores as soon as the other linters are
finished.
This patch chunks the number of specified paths such that there will be N*L
jobs where 'N' is the number of cores and 'L' is the number of linters. This
means even when there's a dominant linter, we'll be making better use of our
resources. This isn't perfect of course, as some paths might contain a small
number of files, and some will contain a very large number of files. But it's
a start
A limitation to this approach is that if there are fewer paths specified than
there are cores, we won't schedule enough jobs per linter to use those extra
cores. One idea might be to expand specified directories and individually list
all the paths under the directory. But this has some hairy edge cases that
would be tough to catch. Doing this in a non-hacky way would also require a
medium scale refactor.
So I propose further parallelization efforts be destined for follow-ups.
MozReview-Commit-ID: JRRu13AFaii
--HG--
extra : rebase_source : 242fb71fe0af8bd2a981bd10a7216bb897fe00ac
The initial motivation for this patch, was to prevent command lines that are
too long on Windows. To that end, there is a cap to the number of paths that
can be run per job. For now that cap is set to 50. This will allow for an
average path length of 160 characters, which should be sufficient with room to
spare.
But another big benefit of this patch is that we are running more things in
parallel. Previously, mozlint ran each linter in its own subprocess, but that's
it. If running eslint is 90% of the work, it'll still only get a single
process. This means we are wasting cores as soon as the other linters are
finished.
This patch chunks the number of specified paths such that there will be N*L
jobs where 'N' is the number of cores and 'L' is the number of linters. This
means even when there's a dominant linter, we'll be making better use of our
resources. This isn't perfect of course, as some paths might contain a small
number of files, and some will contain a very large number of files. But it's
a start
A limitation to this approach is that if there are fewer paths specified than
there are cores, we won't schedule enough jobs per linter to use those extra
cores. One idea might be to expand specified directories and individually list
all the paths under the directory. But this has some hairy edge cases that
would be tough to catch. Doing this in a non-hacky way would also require a
medium scale refactor.
So I propose further parallelization efforts be destined for follow-ups.
MozReview-Commit-ID: JRRu13AFaii
--HG--
extra : rebase_source : 6cd73d8b6888723de3410df043f7ed042ba3349f
This is a new module that will provide a place to store some common
abstractions around the 'blessings' module. The main entrypoint is:
from mozterm import Terminal
term = Terminal()
If blessings is available, this will return a blessings.Terminal()
object. If it isn't available, or something went wrong on import,
this will return a NullTerminal() object, which is a drop-in
replacement that does no formatting.
MozReview-Commit-ID: 6c63svm4tM5
--HG--
extra : rebase_source : 9ab221774d92a418d9b098d79bb2c88f75d937f8
This patch introduces a new report formatter for the mozlint
framework used by "./mach lint" that respects Unix output conventions,
popularised by grep(1), compilers, and preprocessors.
The output format looks like this:
testing/marionette/driver.js:1153:48: no-unused-vars error: 'resp' is defined but never used.
Many editors (ed, Emacs, vi, Acme) recognise this format, allowing
users to interact with the output like a hyperlink to jump to the
specified location in a file.
MozReview-Commit-ID: 3IyiFmNbtMY
--HG--
extra : rebase_source : a2628a999c187a1c43f3cc5d32e6db835028eca4
This also migrates the vcs.py test to mozversioncontrol and adds a new task for
it.
MozReview-Commit-ID: 9jTRkjNupVA
--HG--
extra : rebase_source : 400f27498e00ea45234ad7c951770b098e916b8e
Currently line linters (linters that open a file and process it line by line,
by applying a regex for example), don't handle directories. If a directory is
passed in, it will try to 'open' it, which fails. Directories can get hit if
the linter has a directory in its include directive or if the user passes in
--no-filter.
This patch modifies LineLinters so that if a directory is detected, we search
for all relevant files under that directory. If 'extensions' is used, we'll
look for only files with appropriate extensions. Otherwise we assume the
linter wants every file.
MozReview-Commit-ID: D9lzTNuQTob
--HG--
extra : rebase_source : 0b952c06eae28b67b687813ff7e75b231b2dd4d3
This switches most tests over to use pytest as the runner instead of unittest (taking
advantage of the fact that pytest can run unittest based tests).
There were a couple tests that had failures when swithing to pytest:
config/tests/unit-expandlibs.py
xpcom/idl-parser/xpidl/runtests.py
For these tests, I added a runwith='unittest' argument so that they still run the
same way as before. Once we fix them to use pytest, the unittest logic in mozunit.py
can be deleted.
MozReview-Commit-ID: Gcsz6z8MeOi
--HG--
extra : rebase_source : 3c762422ce0af54cbbe7d9fc20085a2d1ebe7057
This allows .flake8 files to override one another, and fixes a pretty bad known
bug with our flake8 implementation. For example, say we have a .flake8 file at:
/foo/.flake8
Before this patch, if we ran |mach lint foo/bar|, the configuration defined in
that .flake8 file wouldn't get picked up. It would only work if running the
specific directory that contains it, e.g |mach lint foo|.
This change additionally allows multiple .flake8 files to be used. So if
there's one defined at both:
/.flake8
/foo/.flake8
Then running |mach lint foo/bar| will first apply the root .flake8, then the
one under /foo (overriding earlier configuration).
This bug still doesn't make flake8 configuration perfect though. Any directory
containing a .flake8 file still needs to be explicitly listed in the "include"
section of /tools/lint/flake8.yml. Otherwise in the example above, if running
|mach lint /|, it wouldn't be able to find /foo/.flake8. This is a hard problem
and is likely best solved by fixing flake8's upstream configuration handling.
Unfortunately this means we still can't switch from a whitelist to a blacklist.
MozReview-Commit-ID: 3DZAi1QHYYo
--HG--
extra : rebase_source : 51298c5847f6c2792581d9b312c87b70fa716ee1
There's a persistent test failure in automation that seems to have to do
with shutting down the `multiprocessing.Manager` that's used to get a
`Queue` to submit jobs to worker processes. After toying around with fixing
that I decided it would be simpler to just use concurrent.futures here,
since we already have it in-tree and it fits the use case here better
than using raw multiprocessing.
MozReview-Commit-ID: 8DdSvs2qp0q
--HG--
extra : rebase_source : 0b1cbb96bd3016778e4974a311722a8882f87216
While --fix previously worked with eslint, it is now more official (will show
up in the |mach lint --help|). ESlint is still the only thing that implements
it, but we can implement it for flake8 using the `autopep8` module.
--edit is a new concept that will open an editor for each failing file to let
you fix the errors manually. For now it is very naive (just opens the file),
and is only really useful if you have an editor integration for the linter(s).
But in the future I'd like to have editor-specific implementations for this.
For example, with vim, we can use -q to pass in an error file that will start
the editor pre-populated with a list of all errors that can then be easily
jumped to. Other editors may just open up to the line containing the error.
--fix and --edit can be used in conjunction with one another. Doing that means
only errors that can't be fixed automatically will show up in your editor.
MozReview-Commit-ID: 5JJJhMIrMIB
--HG--
extra : rebase_source : 2f78a77a91133d7fcc5620ecd5caa500decbce1b
While --fix previously worked with eslint, it is now more official (will show
up in the |mach lint --help|). ESlint is still the only thing that implements
it, but we can implement it for flake8 using the `autopep8` module.
--edit is a new concept that will open an editor for each failing file to let
you fix the errors manually. For now it is very naive (just opens the file),
and is only really useful if you have an editor integration for the linter(s).
But in the future I'd like to have editor-specific implementations for this.
For example, with vim, we can use -q to pass in an error file that will start
the editor pre-populated with a list of all errors that can then be easily
jumped to. Other editors may just open up to the line containing the error.
--fix and --edit can be used in conjunction with one another. Doing that means
only errors that can't be fixed automatically will show up in your editor.
MozReview-Commit-ID: 5JJJhMIrMIB
--HG--
extra : rebase_source : 889c825dcde5e950e35bc64539b299988f82ac68
We should have CI Lint YAML files in the tree.
MozReview-Commit-ID: IMOKGhxKFJW
--HG--
extra : rebase_source : 8c695dcb3a81b6683bc76ba663feeacb3126691e
We should have CI Lint YAML files in the tree.
MozReview-Commit-ID: IMOKGhxKFJW
--HG--
extra : rebase_source : a2e47f5c5517e999fe21bac4f86491611bd0cece
We should have CI Lint YAML files in the tree.
MozReview-Commit-ID: IMOKGhxKFJW
--HG--
extra : rebase_source : 0ef71f24141a531833d48f2a305183dd808f00f5
Create a test for version control related functionality.
MozReview-Commit-ID: GXd27O69GNg
--HG--
extra : rebase_source : 56ce4a38b591fd62f05fbaed0ff05d56ec127422
The underlying commands to mozlint's vcs.py had a few problems. This:
1. Ensures deleted files aren't considered in both hg and git
2. Automatically determines the default remote repo and branch when using --outgoing with git
3. Excludes metadata from output of the git command used with --outgoing
4. Adds --cached to the git command for --workdir, which lints all staged files
MozReview-Commit-ID: EBtM3MCiCDs
--HG--
extra : rebase_source : 982b24acd81c86e383b28b8a71bcd51a041e60f4
The old method had a bunch of 'if vcs == git' statements and the like. This
made it hard to follow code paths for a given vcs system. I think this refactor
makes things cleaner to read. It shouldn't be changing any functionality.
MozReview-Commit-ID: EBtM3MCiCDs
--HG--
extra : rebase_source : 9c0fda3f4f824351bae852af25bcd2240b1b1024
The rev option is inherently broken. It does let you lint files touched by any
revision, but it doesn't update those files to that revision first. Instead,
they get linted at whatever the working directory is and their results are
bogus. Even if we did some magic to update the files to the proper revision
with in-memory version control magic, the config files would still be out of
date.
Plus, the new --outgoing option does pretty much the only thing --rev was good
for. Rather than cause confusion, I think it's better to just remove the
option.
MozReview-Commit-ID: 2y2UnfIkvsR
--HG--
extra : rebase_source : 9b5c142270c98905d71ebb89d1620e91914c0b47
This was a regression from bug 1288432. The 'extensions' config in mozlint required a
leading period, but eslint requires them without the period (and this got copied over
to the linter definition). The result was mozlint filtering out any files (not dirs)
that were passed in.
This just modifies mozlint to strip out the period so both are acceptable.
MozReview-Commit-ID: CbNynYzrbGz
--HG--
extra : rebase_source : 51c740cb1d2febaee3ae46784f83381cda5e5eaa
Rather than using .lint.py files that contain a LINTER object, linter definitions are now in
standalone .yml files. In the case of external linters that need to run python code, the payload
is now of the form:
<module path>:<object path>
The <module path> is the import path to the module, and <object path> is the callable object to
use within that module. It is up to the consumer of mozlint to ensure the <module path> lives on
sys.path. For example, if an external lint's function lives in package 'foo', file 'bar.py' and
function 'lint', the payload would read:
foo.bar:lint
This mechanism was borrowed from taskcluster.
MozReview-Commit-ID: AIsfbVmozy4
--HG--
rename : python/mozlint/test/linters/badreturncode.lint.py => python/mozlint/test/linters/badreturncode.yml
rename : python/mozlint/test/linters/explicit_path.lint.py => python/mozlint/test/linters/explicit_path.yml
rename : python/mozlint/test/linters/external.lint.py => python/mozlint/test/linters/external.yml
rename : python/mozlint/test/linters/invalid_exclude.lint.py => python/mozlint/test/linters/invalid_exclude.yml
rename : python/mozlint/test/linters/invalid_extension.lnt => python/mozlint/test/linters/invalid_extension.ym
rename : python/mozlint/test/linters/invalid_include.lint.py => python/mozlint/test/linters/invalid_include.yml
rename : python/mozlint/test/linters/invalid_type.lint.py => python/mozlint/test/linters/invalid_type.yml
rename : python/mozlint/test/linters/missing_attrs.lint.py => python/mozlint/test/linters/missing_attrs.yml
rename : python/mozlint/test/linters/missing_definition.lint.py => python/mozlint/test/linters/missing_definition.yml
rename : python/mozlint/test/linters/raises.lint.py => python/mozlint/test/linters/raises.yml
rename : python/mozlint/test/linters/regex.lint.py => python/mozlint/test/linters/regex.yml
rename : python/mozlint/test/linters/string.lint.py => python/mozlint/test/linters/string.yml
rename : python/mozlint/test/linters/structured.lint.py => python/mozlint/test/linters/structured.yml
extra : rebase_source : bda3926712234123355c5af71c6453ce869b19fc
Back when the class was written, for the packaging code, it made sense
that the default was True. But now that it's used all over the place,
and that the vast majority of uses are with find_executables=False, it
makes more sense for that to be the default.
--HG--
extra : rebase_source : ff813735fc0d53093f348f20eb77ee03e9b09d4e
This is an educated guess in an attempt to solve a hard to reproduce intermittent. This
also makes sure the original SIGINT handler is restored after running the linters.
MozReview-Commit-ID: HRo0GRlSN5L
--HG--
extra : rebase_source : 7b8bf4b5818d741b5ab6a38c8c56f4eb53a801c8
This deprecates PYTHON_UNIT_TESTS and replaces it with PYTHON_UNITTEST_MANIFESTS.
In the build system, this means python unittests will be treated the same as all
other test suites that use manifestparser. New manifests called 'python.ini' have
been created for all test directories containing python unittests.
MozReview-Commit-ID: IBHG7Thif2D
--HG--
extra : rebase_source : 11a92a2bc544d067946bbd774975140147458caa
This fixes a UnicodeDecodeError when sys.stdout's encoding can't handle unicode.
MozReview-Commit-ID: 3INna8MRje5
--HG--
extra : rebase_source : bb8f3b5cbdbb6601b6946d5fbb7396848f22b5c6
This replaces the "return_code" property on the LintRoller object with a list of "failed"
linters. This is a bit more useful as it lets us know exactly which linters had a problem
(whereas previously we just knew *something* went wrong). This patch pushes determining
the return code back into cli.py, which I think is fine.
In addition, we now pass the list of failed linters into the formatter. This allows us to
clarify exactly how many linters hit a failure which is a lot better than a seemingly
"successful" summary message.
Finally I also removed the "no files to lint" message because I've seen several people
confuse it for an error. I'll probably add it back as a debug log message when we switch
to using mozlog for output.
MozReview-Commit-ID: 4wyCeOZdOf8
--HG--
extra : rebase_source : 23810a8ab8dd9cbbad6b9e965ccff7214f947fbc
If a linter returns a status code instead of a list of results, mozlint will throw away
that status code and move on to the next linter. We should make sure that status code
bubbles all the way up to the cli.
MozReview-Commit-ID: 9fXpmtlUUT1
--HG--
extra : rebase_source : 84c80d1b24d7233d0c4c6e38b23e775110776d1f
This avoids printing harmless (but confusing) errors to the log. For instance, git users
will see a '.hg not found!' error in the output even though not finding an hg repo is
expected in that case.
MozReview-Commit-ID: DBPOabcV7PA
--HG--
extra : rebase_source : a40de185cd4bf0c58917065d1331e0e663b92b94
Versions of mercurial older than 3.0 don't support the -T shorthand for
the --template option. While most people should be using something
newer, it can still happen that some run an older version, and it's
still trivial to support them by using the long option.
--HG--
extra : rebase_source : 1507aea436779495045df48b044a58f4af1382be
This is mostly to maintain backwards compatibility with the |mach eslint| command. But it's also going to be used in
automation. The 'mozlint-eslint' task will need to pass in --quiet to eslint.
Maybe in the future we should remove this ability and only allow well-defined arguments in mozlint. But for now it's
convenient and allows us to land the eslint->mozlint patch series quicker.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : ad7f0cdeb57ed8a99becb90d761d73ef45ce853a
Some linters, such as flake8, will lint invalid file extensions if you explicitly pass them in. E.g,
|flake8 foobar.js| will result in flake8 attempting to lint a JS file. This is a problem because passing
in files explicitly is exactly what the --rev/--workdir options do. If a developer modifies a JS file
then runs |mach lint -l flake8 -w|, that JS file will get linted.
To prevent this, mozlint needs to handle file extensions instead of relying on the underlying linter to
do it. This patch adds an "extensions" config option to the LINTER dict, and will filter these files out
as part of the 'filterpaths' steps.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : 6fea2942b2db1bea7deca1d6738546362b6ebd65
This will make specifying terminal colours cleaner and provide fallbacks for terminals
with only 8 colours. It also tweaks the 'grey' color to match an update to the eslint
stylish formatter.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : 8d3242edc54bf6505aa2e60cdb08cb0dd9743dd3
It's important to use absolute paths so lint errors for the same files don't show up in two
different places. For example, eslint will absolutize a relative path, whereas flake8 will
not.
This patch also makes sure all include/exclude paths are joined to the mozlint 'root' that
was previously calculated from vcs.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : 9b88ee70a997d3f7b6cc0eb849e47931d5726f20
Previously, vcs related stuff was resolved in the cli.py module. But it's possible
for consumers to bypass the cli and instantiate a LintRoller directly. In fact this
is what the mozlint tests do.
Now that we always try to find the vcs root, calling into vcs is no longer optional.
This patch moves the VCSFiles class to a new vcs.py module and makes LintRoller
responsible for instantiating it instead of cli.py.
MozReview-Commit-ID: 5yA3gDZ1UGM
--HG--
extra : rebase_source : 96adc0ca01e8220b0432b64c96c478fc526db756
extra : source : 709c1e521ad3eb466c3434000aed7f71ebf37365
This makes sure we return absolute paths from the VCSFiles class. This is done so we don't accidentally normalize
the relative paths onto $CWD in the event the relative path is valid in both places.
MozReview-Commit-ID: 2QIuR2YqFos
--HG--
extra : rebase_source : 2e82b4a5cf9a18856bbcb8d04fdc916ff7e72deb
This makes it easier to pass configuration to the filterpaths method. In
the future, 'root' and 'extensions' will both be used here.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : 19ddf511ebd24a1a6c21f7c06b67ab64e78e7903
Some linters, such as flake8, will lint invalid file extensions if you explicitly pass them in. E.g,
|flake8 foobar.js| will result in flake8 attempting to lint a JS file. This is a problem because passing
in files explicitly is exactly what the --rev/--workdir options do. If a developer modifies a JS file
then runs |mach lint -l flake8 -w|, that JS file will get linted.
To prevent this, mozlint needs to handle file extensions instead of relying on the underlying linter to
do it. This patch adds an "extensions" config option to the LINTER dict, and will filter these files out
as part of the 'filterpaths' steps.
MozReview-Commit-ID: KYhC6SEySC3
--HG--
extra : rebase_source : 46807a4913660f33e691b864c2c59c448902dfa5
This removes the unnecessary setting of c-basic-offset from all
python-mode files.
This was automatically generated using
perl -pi -e 's/; *c-basic-offset: *[0-9]+//'
... on the affected files.
The bulk of these files are moz.build files but there a few others as
well.
MozReview-Commit-ID: 2pPf3DEiZqx
--HG--
extra : rebase_source : 0a7dcac80b924174a2c429b093791148ea6ac204
This adds two parameters, --rev and --workdir. Each works both with mercurial and git (though the syntax for
specifying revisions is different between them). The value is simply forwarded to either |hg log| or |git diff|
so syntax like |mach lint -r .~4::.| or |mach lint -r "HEAD~4 HEAD"| will work as expected.
MozReview-Commit-ID: aOGp2Yrncs
--HG--
extra : rebase_source : d2cb834d4cc1a083171a3551af4e72c8a7d14021
There is currently no built-in user interface to mozlint. The only existing interface is the
external cli provided by |mach lint|. However, in the future mozlint may need to be used in a
context where mach isn't readily available (i.e version-control-tools). This patch basically
just moves the cli logic out of mach_commands.py, and into mozlint core. That way it can be
re-used in other places without needing to be re-implemented.
The |mach lint setup| subcommand was removed because apparently subcommands don't work with
the parser attribute. Nothing was using it yet anyway, so I removed it for now. It may get
re-added in some form in the future.
MozReview-Commit-ID: aOGp2Yrncs
--HG--
extra : rebase_source : 8f7530de96e5c131d2ed5bfcdd7a159329401e5b
This makes it easier to lint a path that otherwise wouldn't have been linted due to the include/exclude
directives. Now, you can pass in -n/--no-filter instead of needing to modify the linter configuration file.
MozReview-Commit-ID: GMJuE2C1NyY
--HG--
extra : rebase_source : 03627e930f76903ad629cb01b58c4ae7372e4bb1
This is a really simple and ugly formatter that is compatible with
treeherder's error highlighting mechanism. It is designed to be identical
to the current eslint output on treeherder:
https://dxr.mozilla.org/mozilla-central/rev/4d63dde701b47b8661ab7990f197b6b60e543839/tools/lint/eslint-formatter.js
Eventually eslint will also use this and we can remove that file. Once
bug 1276486 is fixed, we can make this look a little nicer. But for now
it gets the job done.
MozReview-Commit-ID: CwfWPcwWFxF
--HG--
extra : transplant_source : %F3PJ%CB%27%A5%82U%D2%CF%B3%9E%A7%9F%0F%A4%F4%E9%5D%BB
This is a really simple and ugly formatter that is compatible with
treeherder's error highlighting mechanism. It is designed to be identical
to the current eslint output on treeherder:
https://dxr.mozilla.org/mozilla-central/rev/4d63dde701b47b8661ab7990f197b6b60e543839/tools/lint/eslint-formatter.js
Eventually eslint will also use this and we can remove that file. Once
bug 1276486 is fixed, we can make this look a little nicer. But for now
it gets the job done.
MozReview-Commit-ID: CwfWPcwWFxF
--HG--
extra : rebase_source : 8dd39aefec1064e0836c847c6d223db43df4755b
Currently a bug in python (https://bugs.python.org/issue8296) is preventing a KeyboardInterrupt from
reaching the parent process, meaning we can't kill the process with SIGINT. There is a workaround to
this bug, but instead I decided to ignore SIGINT in the parent process completely. Now, each child
process is responsible for handling SIGINT on its own. Since child processes should all shutdown
relatively quickly anyway, this effectively also ends the parent process.
The benefit of doing it this way is that each child process can return the results they have collected
to date. So when a developer hits Ctrl-C, they'll still see some (but not all) formatted lint output.
The downside is that a poorly implemented external linter could block the parent process from exiting
quickly, but if this happens we should just fix the linter.
MozReview-Commit-ID: 2tRJgtmoPYP
--HG--
extra : rebase_source : e72282bcc29c9b22690168dc973a817236cdf8ca
For now, only the following two directories will be linted:
python/mozlint
tools/lint
New directories can be added by adding them to the 'include'
directive in tools/lint/flake8.lint. They all default to the
configuration specified in topsrcdir/.flake8. Subdirectories
can override this configuration by creating their own .flake8
file.
MozReview-Commit-ID: Eag48Lnkp3l
--HG--
extra : rebase_source : 6d98c9fef80055a48cc2622848aa04c3045b747e
The current algorithm for filtering down tests is too naive. For example, given the following
directory structured:
parent
- foo
- bar
- baz
And the following include/exclude directives:
include = ['foo']
exclude = ['foo/bar']
Then running ./mach lint parent and ./mach lint foo/baz should both lint all files in baz but
no files in bar. This provides a nice way to include/exclude directories, while allowing the
underlying linters to find appropriate files to lint *within* those directories.
tl;dr - Straight file paths (no globs) will be passed straight to the underlying linter as is.
While paths with globs will first be resolved to a list of matching file paths.
MozReview-Commit-ID: Eag48Lnkp3l
--HG--
extra : rebase_source : 18ce2231bc4198b1e811d39f9803f0d5e03d982e
Mozlint provides two main benefits:
1. A common system for defining lints across multiple languages
2. A common interface and result format for running them
This commit only adds the core library, it does not add any consumers of mozlint just yet.
MozReview-Commit-ID: CSQzq5del5k
--HG--
extra : rebase_source : b520b96177281a1b1770edf53a01cbc2196f494f
Andrew Halberstadt
Gurzau Raul
Andreas Tolfsen
Steve Armand
Ted Mielczarek
Tom Prince
Sebastian Hengst
Justin Wood
Ryan VanderMeulen
Wes Kocher
Dyex
Mark Banner
Carsten "Tomcat" Book
Mike Hommey
Francesco Pischedda
James Graham
Iris Hsiao
Tom Tromey