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85 lines
2.1 KiB
85 lines
2.1 KiB
4 years ago
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## FileList
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A FileList is a lazy-evaluated list of files. When given a list
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of glob patterns for possible files to be included in the file
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list, instead of searching the file structures to find the files,
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a FileList holds the pattern for latter use.
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This allows you to define a FileList to match any number of
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files, but only search out the actual files when then FileList
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itself is actually used. The key is that the first time an
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element of the FileList/Array is requested, the pending patterns
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are resolved into a real list of file names.
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### Usage
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Add files to the list with the `include` method. You can add glob
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patterns, individual files, or RegExp objects. When the Array
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methods are invoked on the FileList, these items are resolved to
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an actual list of files.
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```javascript
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var fl = new FileList();
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fl.include('test/*.js');
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fl.exclude('test/helpers.js');
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```
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Use the `exclude` method to override inclusions. You can use this
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when your inclusions are too broad.
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### Array methods
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FileList has lazy-evaluated versions of most of the array
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methods, including the following:
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* join
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* pop
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* push
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* concat
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* reverse
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* shift
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* unshift
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* slice
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* splice
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* sort
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* filter
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* forEach
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* some
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* every
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* map
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* indexOf
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* lastIndexOf
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* reduce
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* reduceRight
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When you call one of these methods, the items in the FileList
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will be resolved to the full list of files, and the method will
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be invoked on that result.
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### Special `length` method
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`length`: FileList includes a length *method* (instead of a
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property) which returns the number of actual files in the list
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once it's been resolved.
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### FileList-specific methods
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`include`: Add a filename/glob/regex to the list
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`exclude`: Override inclusions by excluding a filename/glob/regex
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`resolve`: Resolve the items in the FileList to the full list of
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files. This method is invoked automatically when one of the array
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methods is called.
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`toArray`: Immediately resolves the list of items, and returns an
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actual array of filepaths.
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`clearInclusions`: Clears any pending items -- must be used
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before resolving the list.
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`clearExclusions`: Clears the list of exclusions rules.
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