coala: Add coala support

[gaocegege]

Closes #52
Ref coala/coala-bears#1750

Signed-off-by: Ce Gao ce.gao@outlook.com

[gaocegege]

coala is a perfect tool to lint and format the code in command line. But it seems that there is something wrong. I will comment the checkstyle bear now and uncomment it until the bug is fixed.

[jeremydouglass]

Excellent! Good use of coala to clean up the example sketches.

Please create an Issue for the checkstyle bear issue that references the appropriate commit line.

Please clarify what "add coala support" means -- give a bit more detail here and in the log file. For example, it could mean support for running coala manually against the repo, or support for Travis-ci integration of coala, or support for invoking coala from PDE. This will help non-core developers understand how they could use coala with Processing.R

[gaocegege]

#67 has been filed :) And I have added the introduction in #68 , I think it is better to add the detail into the documentation 🤔

WDYT

[jeremydouglass]

Good -- yes, I agree with you that the Coding Style section is the best place for it.

Good inclusion of references, e.g. to FormatR. Is the coala add.r module (bear) based on FormatR, and/or is it designed to follow the same rules?

[gaocegege]

Yes, the FormatRBear uses formatR as the backend.

FormatRBear

Check and correct formatting of R Code using known formatR utility.