Hey everyone, thanks very much for offering support for Pylint. I was trying to use the new linter out and encountered this error:
```
>>> [16] <exec> $ "pylint" "--reports=no" "--msg-template= {line}|{column}|{msg_id}|{symbol}|{msg} " "C:\codes\armi\setup.py"
<<< [12] <lint> 680,114 us
>>> [17] <lint> PyLint <paths = 1>
<<< [16] <exec> 720,123 us
<<< [17] <lint> 720,123 us
[2015-08-18 10:57:29] EXCEPTION: (PhutilAggregateException) Some linters failed:
- Exception: Parameter passed to "setLine()" must be an integer. at [<arcanist>\src\lint\engine\ArcanistLintEngine.php:273]
arcanist(head=master, ref.master=fe8ed2a6f8b0), phutil(head=master, ref.master=e509fc30ae78)
#0 <#2> ArcanistLintMessage::validateInteger(string, string) called at [<arcanist>\src\lint\ArcanistLintMessage.php:75]
#1 <#2> ArcanistLintMessage::setLine(string) called at [<arcanist>\src\lint\linter\ArcanistPyLintLinter.php:135]
#2 <#2> ArcanistPyLintLinter::parseLinterOutput(string, integer, string, string) called at [<arcanist>\src\lint\linter\ArcanistExternalLinter.php:355]
#3 <#2> ArcanistExternalLinter::resolveFuture(string, ExecFuture) called at [<arcanist>\src\lint\linter\ArcanistFutureLinter.php:34]
#4 <#2> ArcanistFutureLinter::didLintPaths(array) called at [<arcanist>\src\lint\engine\ArcanistLintEngine.php:600]
#5 <#2> ArcanistLintEngine::executeDidLintOnPaths(ArcanistPyLintLinter, array) called at [<arcanist>\src\lint\engine\ArcanistLintEngine.php:551]
#6 <#2> ArcanistLintEngine::executeLintersOnChunk(array, array) called at [<arcanist>\src\lint\engine\ArcanistLintEngine.php:479]
#7 <#2> ArcanistLintEngine::executeLinters(array) called at [<arcanist>\src\lint\engine\ArcanistLintEngine.php:217]
#8 ArcanistLintEngine::run() called at [<arcanist>\src\workflow\ArcanistLintWorkflow.php:336]
#9 ArcanistLintWorkflow::run() called at [<arcanist>\scripts\arcanist.php:382]
```
I didn't see any relevant tickets about `pylint` with a few searches here so forgive me if I missed an already existing discussion.
I went poking about and noticed the regular expression match in `<arcanist>\src\lint\ArcanistLintMessage.php` wasn't operating on the input correctly:
```
// Strings like "234" are fine, coerce them to integers.
if (is_string($value) && preg_match('/^\d+\z/', $value)) {
$value = (int)$value;
}
```
I didn't see any relevant tickets about `pylint` with a few searches here so forgive me if I missed an already existing discussion.
I looked at some input and saw " 53" with the leading space. Changing the regex to `'/^\s*\d+\z/'` confirmed this and the linting continued on, operating correctly.
On a bit of a guess I noticed that the source of the input `"--msg-template= {line}|{column}|{msg_id}|{symbol}|{msg} "` has extra spacing. Trying out the following before/after code in `<src>\src\lint\linter\ArcanistPyLintLinter.php` and removing the regex change, things still worked.
```
- $options[] = '--msg-template="{line}|{column}|{msg_id}|{symbol}|{msg}"';
+ $options[] = '--msg-template={line}|{column}|{msg_id}|{symbol}|{msg}';
```
So, I'm guessing the quotations were being replaced with spacing to not break the enclosing quotations on the `msg-template`. If I'm right, would you like me to contribute to the code base after running some tests? or have some more veteran contributor remove the possibly excess quotations? I'm not sure if this is a problem that only occurs in my environment, but for what it's worth I updated arcanist, libphutil, and pylint to the latest.
Thanks again!