This repository contains a package that provides functionality very similar to filepath.Glob, but avoids the following pitfalls (at the expense of complexity):
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filepath.Glob cannot be cancelled. If it starts running on an extremely large directory tree, your goroutine is blocked until it finishes.
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filepath.Glob collects each directory's entire contents in a slice and sorts it - this is expensive for large directories.
This is not an officially supported Google product.
Aside from avoiding those pitfalls (and, by necessity, dropping the un-spoken promise that filepath.Glob returns directory contents sorted), this library strives to produce the same results as filepath.Glob. In fact, if when reading the code you think "this is an awkward retrofit of asynchronous API on to a synchronous algorithm", your observation is correct. This code was copy-pasted from the Go standard library and modified to provide asynchronous operation without altering the fundamental globbing algorithm: confidence in the algorithm's equivalence to filepath.Glob is valued before the code's independent beauty.