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