mirror of
https://github.com/Luzifer/ansible-role-version.git
synced 2024-12-24 11:31:21 +00:00
179 lines
3.8 KiB
Go
179 lines
3.8 KiB
Go
package plumbing
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import (
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"errors"
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"fmt"
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"strings"
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)
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const (
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refPrefix = "refs/"
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refHeadPrefix = refPrefix + "heads/"
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refTagPrefix = refPrefix + "tags/"
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refRemotePrefix = refPrefix + "remotes/"
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refNotePrefix = refPrefix + "notes/"
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symrefPrefix = "ref: "
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)
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// RefRevParseRules are a set of rules to parse references into short names.
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// These are the same rules as used by git in shorten_unambiguous_ref.
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// See: https://github.com/git/git/blob/e0aaa1b6532cfce93d87af9bc813fb2e7a7ce9d7/refs.c#L417
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var RefRevParseRules = []string{
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"refs/%s",
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"refs/tags/%s",
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"refs/heads/%s",
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"refs/remotes/%s",
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"refs/remotes/%s/HEAD",
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}
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var (
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ErrReferenceNotFound = errors.New("reference not found")
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)
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// ReferenceType reference type's
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type ReferenceType int8
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const (
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InvalidReference ReferenceType = 0
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HashReference ReferenceType = 1
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SymbolicReference ReferenceType = 2
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)
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func (r ReferenceType) String() string {
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switch r {
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case InvalidReference:
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return "invalid-reference"
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case HashReference:
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return "hash-reference"
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case SymbolicReference:
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return "symbolic-reference"
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}
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return ""
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}
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// ReferenceName reference name's
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type ReferenceName string
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// IsBranch check if a reference is a branch
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func (r ReferenceName) IsBranch() bool {
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return strings.HasPrefix(string(r), refHeadPrefix)
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}
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// IsNote check if a reference is a note
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func (r ReferenceName) IsNote() bool {
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return strings.HasPrefix(string(r), refNotePrefix)
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}
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// IsRemote check if a reference is a remote
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func (r ReferenceName) IsRemote() bool {
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return strings.HasPrefix(string(r), refRemotePrefix)
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}
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// IsTag check if a reference is a tag
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func (r ReferenceName) IsTag() bool {
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return strings.HasPrefix(string(r), refTagPrefix)
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}
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func (r ReferenceName) String() string {
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return string(r)
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}
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// Short returns the short name of a ReferenceName
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func (r ReferenceName) Short() string {
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s := string(r)
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res := s
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for _, format := range RefRevParseRules {
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_, err := fmt.Sscanf(s, format, &res)
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if err == nil {
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continue
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}
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}
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return res
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}
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const (
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HEAD ReferenceName = "HEAD"
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Master ReferenceName = "refs/heads/master"
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)
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// Reference is a representation of git reference
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type Reference struct {
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t ReferenceType
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n ReferenceName
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h Hash
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target ReferenceName
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}
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// NewReferenceFromStrings creates a reference from name and target as string,
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// the resulting reference can be a SymbolicReference or a HashReference base
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// on the target provided
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func NewReferenceFromStrings(name, target string) *Reference {
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n := ReferenceName(name)
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if strings.HasPrefix(target, symrefPrefix) {
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target := ReferenceName(target[len(symrefPrefix):])
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return NewSymbolicReference(n, target)
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}
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return NewHashReference(n, NewHash(target))
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}
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// NewSymbolicReference creates a new SymbolicReference reference
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func NewSymbolicReference(n, target ReferenceName) *Reference {
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return &Reference{
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t: SymbolicReference,
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n: n,
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target: target,
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}
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}
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// NewHashReference creates a new HashReference reference
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func NewHashReference(n ReferenceName, h Hash) *Reference {
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return &Reference{
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t: HashReference,
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n: n,
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h: h,
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}
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}
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// Type return the type of a reference
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func (r *Reference) Type() ReferenceType {
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return r.t
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}
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// Name return the name of a reference
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func (r *Reference) Name() ReferenceName {
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return r.n
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}
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// Hash return the hash of a hash reference
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func (r *Reference) Hash() Hash {
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return r.h
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}
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// Target return the target of a symbolic reference
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func (r *Reference) Target() ReferenceName {
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return r.target
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}
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// Strings dump a reference as a [2]string
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func (r *Reference) Strings() [2]string {
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var o [2]string
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o[0] = r.Name().String()
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switch r.Type() {
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case HashReference:
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o[1] = r.Hash().String()
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case SymbolicReference:
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o[1] = symrefPrefix + r.Target().String()
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}
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return o
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}
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func (r *Reference) String() string {
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s := r.Strings()
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return fmt.Sprintf("%s %s", s[1], s[0])
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}
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