ISSUE-394: expand patterns with brace expansion to avoid some matching issues

[mrmlnc]

What is the purpose of this pull request?

Solves some of the problems with matching patterns containing brace expansion. Primary solves the problem when the pattern has duplicate slashes after it is expanded (#394), or the micromatch package does not correctly generate a regular expression (#365).

What changes did you make? (Give an overview)

Expand patterns with brace expansions once at the very beginning of pattern processing when generating tasks.

This solution can lead to a slight slowdown in matching in the case of a large set of patterns after expansion. Problems with performance should deal with the issues as they come.

fg.sync('fixtures/{.directory,first,first/nested,second,second/nested,third,third/library,third/library/a,third/library/b}/*')

// PR: 6ms
// Master: 5.5ms

fg.generateTasks

fg.generateTasks(/* … */);
// Master
[
  {
    dynamic: true,
    positive: [
      'fixtures/{.directory,first,first/nested,second,second/nested,third,third/library,third/library/a,third/library/b}/*'
    ],
    negative: [],
    base: 'fixtures',
    patterns: [
      'fixtures/{.directory,first,first/nested,second,second/nested,third,third/library,third/library/a,third/library/b}/*'
    ]
  }
]

// PR
[
  {
    dynamic: true,
    positive: [
      'fixtures/first/*'
    ],
    negative: [],
    base: 'fixtures/first',
    patterns: [
      'fixtures/first/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/third/*'
    ],
    negative: [],
    base: 'fixtures/third',
    patterns: [
      'fixtures/third/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/second/*'
    ],
    negative: [],
    base: 'fixtures/second',
    patterns: [
      'fixtures/second/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/.directory/*'
    ],
    negative: [],
    base: 'fixtures/.directory',
    patterns: [
      'fixtures/.directory/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/first/nested/*'
    ],
    negative: [],
    base: 'fixtures/first/nested',
    patterns: [
      'fixtures/first/nested/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/second/nested/*'
    ],
    negative: [],
    base: 'fixtures/second/nested',
    patterns: [
      'fixtures/second/nested/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/third/library/*'
    ],
    negative: [],
    base: 'fixtures/third/library',
    patterns: [
      'fixtures/third/library/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/third/library/a/*'
    ],
    negative: [],
    base: 'fixtures/third/library/a',
    patterns: [
      'fixtures/third/library/a/*'
    ]
  },
  {
    dynamic: true,
    positive: [
      'fixtures/third/library/b/*'
    ],
    negative: [],
    base: 'fixtures/third/library/b',
    patterns: [
      'fixtures/third/library/b/*'
    ]
  }
]

In the future, we can learn to forcibly group patterns into groups if one base directory has 2+ nested directories in adjacent patterns.