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type Describable interface {
	// ReachableTag returns the most recent reachable tag,
	// preferring semver tags. It returns ErrorVersionNotFound if
	// no suitable tag is found.
	ReachableTag(rev string) (string, error)

	// TimeFromRevision returns the commit timestamp from the
	// revision rev.
	TimeFromRevision(rev string) (time.Time, error)
}

type FileHash string

type FileHashes struct {
	// contains filtered or unexported fields
}

type GoSource struct {
	// Path is the filepath to the top-level package
	Path string

	// SubPath is the top-level filepath relative to the root of
	// the repository, or "" if they are the same.
	SubPath string

	// Package is any import path in this project
	Package string
	// contains filtered or unexported fields
}

type Hasher interface {
	// Hash returns the file hash for the filename absPath, hashed
	// as though it were in the repository as filename
	// relativePath.
	Hash(relativePath, absPath string) (FileHash, error)
}

type Reference struct {
	// Tag is the semver tag within the upstream repository which
	// corresponds exactly to the vendored copy of the project. If
	// no tag corresponds Tag is "".
	Tag string

	// Rev is the upstream revision from which the vendored
	// copy was taken. If this is not known Reference is "".
	Rev string

	// Ver is the semantic version or pseudo-version for the
	// commit named in Reference. This is Tag if Tag is not "".
	Ver string
}

type RepoPath struct {
	vcs.RepoRoot

	// SubPath is the top-level filepath relative to the root of
	// the repository, or "" if they are the same.
	SubPath string

	Version string
}

type WorkingTree interface {
	io.Closer

	// Should be something that supports creating pseudo-versions.
	Describable

	// TagSync syncs the repo to the named tag.
	TagSync(tag string) error

	// VersionTags returns the semantic version tags.
	VersionTags() ([]string, error)

	// Revisions returns all revisions, newest to oldest.
	Revisions() ([]string, error)

	// FileHashesFromRef returns the file hashes for the tag or
	// revision ref. The returned FileHashes will be relative to
	// the subPath, which is itself relative to the repository
	// root.
	FileHashesFromRef(ref, subPath string) (*FileHashes, error)

	// RevSync syncs the repo to the named revision.
	RevSync(rev string) error

	// RevisionFromTag returns the revision ID from the tag.
	RevisionFromTag(tag string) (string, error)

	// StripImportComment removes import comments from package
	// declarations in the same way godep does, writing the result
	// (if changed) to w. It returns a boolean indicating whether
	// an import comment was removed.
	//
	// The file content may be written to w even if no change was made.
	StripImportComment(path string, w io.Writer) (bool, error)
}