Update rules for ruby

[knu]

• Add support for mass assignment
• Make rules stricter to reduce noises
• Use \W intead of \j, since the latter does not seem to work well (namely with git-grep)

[coveralls]

Coverage remained the same at 97.31% when pulling dff0612 on knu:update_rules_for_ruby into 3b4ab94 on jacktasia:master.

[knu]

Another point: This adds support for git-grep, while removing use of (rather pointless) (?:...) which git-grep with -E given does not understand.

I think you could just use -P because almost all distributions of git has PCRE support compiled in including those of macOS and FreeBSD, not just Linux. However, that is another story.

[knu]

Will fix the build failures.

[jacktasia]

Thanks for working on this! I'll merge it as soon as all the tests pass. Please let me know if I can help.

I think you could just use -P because almost all distributions of git has PCRE support compiled in including those of macOS and FreeBSD, not just Linux.

I can't remember now, but there was some OS/Distro back when I started this project where the default/built-in grep did not have support for -P. It might have been an older version macOS. That said, I am open to switching to using it I'd just need to do some tests and explicitly check if it -P is supported and then warn the user if it won't work.

[coveralls]

Coverage remained the same at 97.31% when pulling f7008df on knu:update_rules_for_ruby into 3b4ab94 on jacktasia:master.

[coveralls]

Coverage remained the same at 97.31% when pulling e294eff on knu:update_rules_for_ruby into 3b4ab94 on jacktasia:master.

[jacktasia]

Thanks!