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x/model: clarify Merge semantics

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This commit is contained in:
Blake Mizerany 2024-04-04 15:03:54 -07:00
parent 6aa9795c4f
commit cfe0bb6bb6
1 changed files with 11 additions and 9 deletions
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20
x/model/name.go
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@ -175,19 +175,21 @@ func ParseName(s string) Name {
return r
}
// Merge folds the domain, namespace, tag, and build of b into a if not set.
// The name is left untouched.
// Merge performs a partial merge of dst into src. Only the non-name parts
// are merged. The name part is always left untouched. Other parts are
// merged if and only if they are missing in dst.
//
// Use this for merging a ref with a default ref.
func Merge(a, b Name) Name {
// Use this for merging a fully qualified ref with a partial ref, such as
// when filling in a missing parts with defaults.
func Merge(dst, src Name) Name {
return Name{
// name is left untouched
nick: a.nick,
nick: dst.nick,
domain: cmp.Or(a.domain, b.domain),
namespace: cmp.Or(a.namespace, b.namespace),
tag: cmp.Or(a.tag, b.tag),
build: cmp.Or(a.build, b.build),
domain: cmp.Or(dst.domain, src.domain),
namespace: cmp.Or(dst.namespace, src.namespace),
tag: cmp.Or(dst.tag, src.tag),
build: cmp.Or(dst.build, src.build),
}
}