ISSUE-86: Allow to use inverted negative patterns

[mrmlnc]

What is the purpose of this pull request?

So, this is «present» PR for original problem described in the issue (#86).

What changes did you make? (Give an overview)

This is introduction of the concept of «inverted negative patterns».

The inverted negative pattern is a usual negative pattern inside the ignore option. This pattern will be used as a positive pattern when searching.

FileSystem Tree

fixtures
├── invalid.bar
├── invalid.json
├── invalid.svg
├── invalid.txt
├── invalid.xml
└── nested
    ├── valid.abc
    ├── valid.json
    ├── valid.txt
    └── valid.svg

Default behavior

const entries = fg.sync(['**/*'], {
    cwd: 'fixtures'
}).sort();

// [
//   'invalid.bar', 'invalid.json', 'invalid.svg', 'invalid.txt', 'invalid.xml',
//   'nested/valid.abc', 'nested/valid.json', 'nested/valid.txt', 'nested/valid.svg'
// ]

Behavior with inverted negative patterns

const entries = fg.sync(['**/*'], {
    ignore: ['!*.txt'], // only files with the «txt» extension and only at any level of the tree
    cwd: 'fixtures'
}).sort();

// [ 'invalid.txt' ]

const entries = fg.sync(['**/*'], {
    ignore: ['!**/*.{txt,svg}', '*'], // only txt or svg at any level of the tree, but not on the first
    cwd: 'fixtures'
}).sort();

// [ 'nested/valid.txt', 'nested/valid.svg' ]

const entries = fg.sync(['**/*'], {
    ignore: ['!**/*.{txt,svg}', '**/*.txt'], // only svg at any level of the tree
    cwd: 'fixtures'
}).sort();

// [ 'invalid.svg', 'nested/valid.svg' ]

[mrmlnc]

@evilebottnawi, please take a look at this functionality. Tests in the file-type-lint package pass fine.

[alexander-akait]

@mrmlnc looks like doesn't work as expected
pattern:

const patterns = [ 
      '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/**/valid*.*',
      '!**/.git/**',
      '!./.git/**',
      '!**/node_modules/**',
      '!./node_modules/**',
      '!**/bower_components/**',
      '!./bower_components/**',
      '!**/vendor/**',
      '!./vendor/**' 
];

fg(patterns, { ignore: [`!**/*.{yaml,xml}`] }).then((entries) => console.log(entries));

Output:

[ '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/encodings.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/misc.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/modules.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/php.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/vcs.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/watcherTasks.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/workspace.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/coverage/clover.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/codeStyles/codeStyleConfig.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/dictionaries/sheo13666q.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/.idea/inspectionProfiles/Project_Default.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/invalid.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/invalid.yaml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/valid.xml',
      '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/valid.yaml' ]

Expected:

[
  '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/valid.xml',
  '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/valid.yaml',
  '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/nested/valid.xml',
  '/home/evilebottnawi/IdeaProjects/file-type-lint/src/__tests__/fixtures/nested/valid.yaml',
 ]

Not respected process.cwd() and nested is not preset 😕

[mrmlnc]

Outdated.