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ipn: use cmd/cloner for Prefs.Clone

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Also, make cmd/cloner's top-level "func Clone" generation opt-in.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-10-19 10:46:30 -07:00
committed by Brad Fitzpatrick
parent 6cc6e251a9
commit 7c8ca28c74
4 changed files with 75 additions and 29 deletions
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39
cmd/cloner/cloner.go
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@@ -33,6 +33,7 @@ var (
flagTypes = flag.String("type", "", "comma-separated list of types; required")
flagOutput = flag.String("output", "", "output file; required")
flagBuildTags = flag.String("tags", "", "compiler build tags to apply")
flagCloneFunc = flag.Bool("clonefunc", false, "add a top-level Clone func")
)
func main() {
@@ -98,25 +99,27 @@ func main() {
w := func(format string, args ...interface{}) {
fmt.Fprintf(buf, format+"\n", args...)
}
w("// Clone duplicates src into dst and reports whether it succeeded.")
w("// To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,")
w("// where T is one of %s.", *flagTypes)
w("func Clone(dst, src interface{}) bool {")
w(" switch src := src.(type) {")
for _, typeName := range typeNames {
w(" case *%s:", typeName)
w(" switch dst := dst.(type) {")
w(" case *%s:", typeName)
w(" *dst = *src.Clone()")
w(" return true")
w(" case **%s:", typeName)
w(" *dst = src.Clone()")
w(" return true")
w(" }")
if *flagCloneFunc {
w("// Clone duplicates src into dst and reports whether it succeeded.")
w("// To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,")
w("// where T is one of %s.", *flagTypes)
w("func Clone(dst, src interface{}) bool {")
w(" switch src := src.(type) {")
for _, typeName := range typeNames {
w(" case *%s:", typeName)
w(" switch dst := dst.(type) {")
w(" case *%s:", typeName)
w(" *dst = *src.Clone()")
w(" return true")
w(" case **%s:", typeName)
w(" *dst = src.Clone()")
w(" return true")
w(" }")
}
w(" }")
w(" return false")
w("}")
}
w(" }")
w(" return false")
w("}")
contents := new(bytes.Buffer)
fmt.Fprintf(contents, header, *flagTypes, pkg.Name)