func assertPeeledRef(t *testing.T, peeledRef objects.Ref, oid *objects.ObjectId) {
symbolic, target := peeledRef.Target()
util.Assert(t, !symbolic)
if target == nil {
t.Fatalf("nil target")
}
util.AssertEqualString(t, target.(*objects.ObjectId).String(), oid.String())
util.AssertEqualString(t, peeledRef.ObjectId().String(), oid.String())
util.AssertPanic(t, func() {
s := target.(string)
s += "" // for compilation
})
}
func assertSymbolicRef(t *testing.T, symbolicRef objects.Ref, tget string) {
symbolic, target := symbolicRef.Target()
util.Assert(t, symbolic)
if target == nil {
t.Fatalf("nil target")
}
util.AssertEqualString(t, target.(string), tget)
util.AssertPanic(t, func() {
oid := target.(*objects.ObjectId)
oid.String() // for compilation
})
util.AssertPanic(t, func() {
oid := symbolicRef.ObjectId()
oid.String() // for compilation
})
}
// PeelRef resolves the final target oid of the ref and returns
// a peeled ref for this target. It examines the target of the
// given ref and if the target is symbolic, it is followed and
// resolved. This process repeats as many times as necessary to
// obtain a peeled ref.
func PeelRef(repo Repository, r objects.Ref) (objects.Ref, error) {
var (
err error
symbolic bool
target interface{}
)
// TODO: make a limit
for {
symbolic, target = r.Target()
if symbolic {
r, err = repo.Ref(target.(string))
if err != nil {
return nil, err
}
} else {
break
}
}
return r, nil
}
// TODO: come up with a better name for this
func (f *formatter) Deref(r objects.Ref) (int, error) {
return fmt.Fprintf(f.Writer, "%s %s^{}", r.Commit(), r.Name())
}
func (f *formatter) Ref(r objects.Ref) (int, error) {
_, rf := r.Target() // symbolic or oid
return fmt.Fprintf(f.Writer, "%s %s", rf, r.Name())
}