Add printing total count when rubocop --format offences

[ma2gedev]

I would like to know total count when rubocop --format offences so print total offence counts.

BEFORE

1  Proc
1  WordArray

AFTER

1  Proc
1  WordArray
--
2  Total

[yujinakayama]

Though I'm on the fence about this, originally the offence count formatter was intended to be used together with another formatter like:

# Use both progress formatter (the default) and offence count formatter
$ rubocop -fp -fo
# ...
spec/unit/presenter_spec.rb:116:61: C: Place the . on the next line, together with the method name.
        expect(StringUtils).to have_received(:wrap_with_sgr).
                                                            ^

21 files inspected, 73 offences detected

32  DotPosition
17  SingleLineMethods
15  EmptyLineBetweenDefs
2   LineLength
2   TrailingComma
2   AlignParameters
2   MethodLength
1   CyclomaticComplexity

[bbatsov]

@yujinakayama I guess you should extend the documentation on formatter, since outside of you, me and @jonas054 most people probably don't know they can chain formatters.

[yujinakayama]

@bbatsov Sure. In fact it's described in the text of --help, but it's obscure.

By the way, after my first reaction, I tend to agree this change now. It would be useful if the formatter can be used alone also, and I don't think it's too verbose even if it's combined with another formatter:

21 files inspected, 73 offences detected

32  DotPosition
17  SingleLineMethods
15  EmptyLineBetweenDefs
2   LineLength
2   TrailingComma
2   AlignParameters
2   MethodLength
1   CyclomaticComplexity
--
73  Total

[bbatsov]

@yujinakayama OK.

@ma2gedev Update the changelog and squash all commits into one.

[ma2gedev]

Thanks for explain background about offence count formatter, I understood it.

[ma2gedev]

I squashed all commits with the changelog.

[bbatsov]

That should be in a section "Changes". You should also add your github handle to the bottom of the changelog.

[bbatsov]

The README and the relevant spec should also be updated.

[ma2gedev]

Thanks for mentoring me. I updated the changelog, spec and README.

[bbatsov]

@ma2gedev You're welcome. Thanks for your contribution!

[ma2gedev]

@bbatsov Thanks!