144 lines
3.4 KiB
Go
144 lines
3.4 KiB
Go
package config
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import (
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"errors"
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"strings"
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"gopkg.in/src-d/go-git.v4/plumbing"
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)
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const (
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refSpecWildcard = "*"
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refSpecForce = "+"
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refSpecSeparator = ":"
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)
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var (
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ErrRefSpecMalformedSeparator = errors.New("malformed refspec, separators are wrong")
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ErrRefSpecMalformedWildcard = errors.New("malformed refspec, mismatched number of wildcards")
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)
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// RefSpec is a mapping from local branches to remote references
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// The format of the refspec is an optional +, followed by <src>:<dst>, where
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// <src> is the pattern for references on the remote side and <dst> is where
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// those references will be written locally. The + tells Git to update the
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// reference even if it isn’t a fast-forward.
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// eg.: "+refs/heads/*:refs/remotes/origin/*"
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//
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// https://git-scm.com/book/es/v2/Git-Internals-The-Refspec
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type RefSpec string
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// Validate validates the RefSpec
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func (s RefSpec) Validate() error {
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spec := string(s)
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if strings.Count(spec, refSpecSeparator) != 1 {
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return ErrRefSpecMalformedSeparator
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}
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sep := strings.Index(spec, refSpecSeparator)
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if sep == len(spec)-1 {
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return ErrRefSpecMalformedSeparator
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}
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ws := strings.Count(spec[0:sep], refSpecWildcard)
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wd := strings.Count(spec[sep+1:], refSpecWildcard)
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if ws == wd && ws < 2 && wd < 2 {
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return nil
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}
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return ErrRefSpecMalformedWildcard
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}
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// IsForceUpdate returns if update is allowed in non fast-forward merges.
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func (s RefSpec) IsForceUpdate() bool {
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return s[0] == refSpecForce[0]
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}
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// IsDelete returns true if the refspec indicates a delete (empty src).
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func (s RefSpec) IsDelete() bool {
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return s[0] == refSpecSeparator[0]
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}
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// Src return the src side.
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func (s RefSpec) Src() string {
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spec := string(s)
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var start int
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if s.IsForceUpdate() {
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start = 1
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} else {
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start = 0
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}
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end := strings.Index(spec, refSpecSeparator)
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return spec[start:end]
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}
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// Match match the given plumbing.ReferenceName against the source.
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func (s RefSpec) Match(n plumbing.ReferenceName) bool {
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if !s.IsWildcard() {
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return s.matchExact(n)
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}
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return s.matchGlob(n)
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}
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// IsWildcard returns true if the RefSpec contains a wildcard.
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func (s RefSpec) IsWildcard() bool {
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return strings.Contains(string(s), refSpecWildcard)
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}
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func (s RefSpec) matchExact(n plumbing.ReferenceName) bool {
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return s.Src() == n.String()
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}
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func (s RefSpec) matchGlob(n plumbing.ReferenceName) bool {
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src := s.Src()
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name := n.String()
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wildcard := strings.Index(src, refSpecWildcard)
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var prefix, suffix string
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prefix = src[0:wildcard]
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if len(src) > wildcard+1 {
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suffix = src[wildcard+1:]
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}
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return len(name) >= len(prefix)+len(suffix) &&
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strings.HasPrefix(name, prefix) &&
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strings.HasSuffix(name, suffix)
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}
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// Dst returns the destination for the given remote reference.
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func (s RefSpec) Dst(n plumbing.ReferenceName) plumbing.ReferenceName {
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spec := string(s)
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start := strings.Index(spec, refSpecSeparator) + 1
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dst := spec[start:]
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src := s.Src()
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if !s.IsWildcard() {
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return plumbing.ReferenceName(dst)
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}
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name := n.String()
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ws := strings.Index(src, refSpecWildcard)
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wd := strings.Index(dst, refSpecWildcard)
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match := name[ws : len(name)-(len(src)-(ws+1))]
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return plumbing.ReferenceName(dst[0:wd] + match + dst[wd+1:])
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}
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func (s RefSpec) String() string {
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return string(s)
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}
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// MatchAny returns true if any of the RefSpec match with the given ReferenceName.
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func MatchAny(l []RefSpec, n plumbing.ReferenceName) bool {
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for _, r := range l {
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if r.Match(n) {
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return true
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}
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}
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return false
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}
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