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64 lines
3.2 KiB
Markdown
64 lines
3.2 KiB
Markdown
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# Upgrading from v3 to v4
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v4 is a complete rewrite with a focus on performance. Additionally,
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[doublestar] has been updated to use the new [io/fs] package for filesystem
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access. As a result, it is only supported by [golang] v1.16+.
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`Match()` and `PathMatch()` mostly did not change, besides big performance
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improvements. Their API is the same. However, note the following corner cases:
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* In previous versions of [doublestar], `PathMatch()` could accept patterns
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that used either platform-specific path separators, or `/`. This was
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undocumented and didn't match `filepath.Match()`. In v4, both `pattern` and
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`name` must be using appropriate path separators for the platform. You can
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use `filepath.FromSlash()` to change `/` to platform-specific separators if
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you aren't sure.
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* In previous versions of [doublestar], a pattern such as `path/to/a/**` would
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_not_ match `path/to/a`. In v4, this pattern _will_ match because if `a` was
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a directory, `Glob()` would return it. In other words, the following returns
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true: `Match("path/to/a/**", "path/to/a")`
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`Glob()` changed from using a [doublestar]-specific filesystem abstraction (the
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`OS` interface) to the [io/fs] package. As a result, it now takes a `fs.FS` as
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its first argument. This change has a couple ramifications:
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* Like `io/fs.Glob`, `pattern` must use a `/` as path separator, even on
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platforms that use something else. You can use `filepath.ToSlash()` on your
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patterns if you aren't sure.
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* Patterns that contain `/./` or `/../` are invalid. The [io/fs] package
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rejects them, returning an IO error. Since `Glob()` ignores IO errors, it'll
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end up being silently rejected. You can run `path.Clean()` to ensure they are
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removed from the pattern.
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v4 also added a `GlobWalk()` function that is slightly more performant than
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`Glob()` if you just need to iterate over the results and don't need a string
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slice. You also get `fs.DirEntry` objects for each result, and can quit early
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if your callback returns an error.
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# Upgrading from v2 to v3
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v3 introduced using `!` to negate character classes, in addition to `^`. If any
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of your patterns include a character class that starts with an exclamation mark
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(ie, `[!...]`), you'll need to update the pattern to escape or move the
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exclamation mark. Note that, like the caret (`^`), it only negates the
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character class if it is the first character in the character class.
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# Upgrading from v1 to v2
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The change from v1 to v2 was fairly minor: the return type of the `Open` method
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on the `OS` interface was changed from `*os.File` to `File`, a new interface
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exported by doublestar. The new `File` interface only defines the functionality
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doublestar actually needs (`io.Closer` and `Readdir`), making it easier to use
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doublestar with [go-billy], [afero], or something similar. If you were using
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this functionality, updating should be as easy as updating `Open's` return
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type, since `os.File` already implements `doublestar.File`.
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If you weren't using this functionality, updating should be as easy as changing
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your dependencies to point to v2.
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[afero]: https://github.com/spf13/afero
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[doublestar]: https://github.com/bmatcuk/doublestar
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[go-billy]: https://github.com/src-d/go-billy
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[golang]: http://golang.org/
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[io/fs]: https://golang.org/pkg/io/fs/
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