Feature: Add --out flag to ng lint

[philipooo]

Use-case

In our CI we use SonarQube and the TypeScript plugin which can parse the tslint output and translate it into issues. To generate the output I want to use ng lint.

Request

Because there is no way to store the output of ng lint --format json into a valid json file it would be useful to add the --out argument and pass it to tslint.

[clydin]

The next release will allow you to properly redirect the output to a file.
ref: #4917

[filipesilva]

Closing as answered. Thanks to @moritz-h for implementing it!

[philipooo]

Awesome. Thank you!

[moritz-h]

@filipesilva @clydin @philipooo
Thanks for mentioning my fix. But this was only the easy small part I did. There is a even bigger issue for using ng lint formatted output in CI. See #4849. There I found the error source, but I don't know how it could be fixed. I just have a workaround for pmd format:

ng lint --format pmd > result.xml
tr -d '\n' < result.xml > result-fix.xml # all text in one line for sed
sed -i -e 's/<\/pmd><pmd version="tslint">//g' result-fix.xml # fix xml

[denisharder]

Hello, which release has the --out option in? I can't seem to find it in the code.
I don't see it within the latest beta tag:
https://github.com/angular/angular-cli/blob/v1.5.0-beta.2/packages/%40angular/cli/commands/lint.ts

[LayZeeDK]

Thanks for the workaround, @moritz-h. I had some trouble on Windows but got it working with two commands:

ng lint --format pmd > result.xml
sed -i -r -n -e "/<pmd version=\"tslint\">/,${p}" result.xml

[moritz-h]

@LayZeeDK The problem with messed up xml is fixed long time ago. See the issue I referenced above.
The tr and sed workaround is not needed anymore, just do:

ng lint --format pmd > result.xml

[siegenthalerroger]

This was never actually added from what I can see, please revisit this. It would be a great simplification.

[GregorioPerego]

It would be really great to have that "--output" option.

Right now the only possibility to store the tslint result in a file is by redirecting standard output stream to a file, but it sometimes includes the ANSI escapes (colors) in the generated file, making the file not well-formatted. Example:
ng lint wp --format checkstyle --force > ../target/tslint-result.xml

Thanks

[westonpace]

@GregorioPerego It appears redirecting to a file is the intended way to do this. The fix mentioned above by @moritz-h was to enable that. If the format is non-human readable and there are illegal characters in the output then that would be a separate bug on it's own.

[rtaft]

ng lint --format json > lint.json
The content of the file is not json as all the other log output is there. --silent hides the json and leaves the debug output.

[westonpace]

@rtaft I think you are encoutnering #12674

[rtaft]

@westonpace yes, that sounds about right, thank you