Linter rule ideas

[scripthunter7]

In this issue, we can collect the main linter rule ideas. A linter rule basically targets a specific problem and the rules can be enabled / disabled individually in the linter config. Let's try to define each rule as best as possible.

Example rules:

• Check unopened / unclosed if directives. For example:

  ! Unopened if:
  !#endif
  rule
  ! Unclosed if:
  !#if (adguard)
  rule
  

• Warning on multilple selectors. For example:

  ! Multiple selectors are used simultaneously within the rule:
  example.com##.ad, .ad2
  ! But this is ok:
  example.net###.ad
  

  • Suggest fix (the linter can suggest a fix):

    example.com##.ad
    example.com##.ad2
    example.net###.ad
    

• Check redundant wildcards. For example:

  ! Redundant *^
  example.*^
  ! Redundant *
  ex**ample.com
  

@ameshkov @Alex-302