Added control statement spacing linter #81

[mmzoo]

/ Good
div = 'This is what the official slim documentation uses consistently'

/ Bad
div= 'This is not allowed by the linter.'
div=    'Neither is this'
div         = 'Neither is this'

Notice that this error can only occur with = but not with -

div - bad

/ Compiles to:
/ <div>- bad</div>

[ermolaev]

Hi, it nice rule, but not work if using == https://github.com/slim-template/slim#output-without-html-escaping-

h1 == page_header(@page)

ControlStatementSpacing: Please add a space before and after the =

[swrobel]

I notice this doesn't have any opinion on =ok which, according to my source files, does not seem to raise an error. In my opinion, = ok (with the space) should be enforced. Any opinions from the author or @sds?

[mmzoo]

I consistently use the space as it's more readable. Slim's official snippets also keep that standard. I thought this was already enforced 😄

I just checked, you're right and it is not enforced, the following test fails (i.e. nothing is reported):

  context 'control statement without element and without space' do
    let(:slim) { '=ok' }

    it { should report_lint }
  end