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package globalflag
import (
"flag"
"fmt"
"strings"
"github.com/spf13/pflag"
)
// AddGlobalFlags explicitly registers flags that libraries (log, verflag, etc.) register
// against the global flagsets from "flag".
// We do this in order to prevent unwanted flags from leaking into the component's flagset.
func AddGlobalFlags(fs *pflag.FlagSet, name string) {
fs.BoolP("help", "h", false, fmt.Sprintf("help for %s", name))
}
// normalize replaces underscores with hyphens
// we should always use hyphens instead of underscores when registering component flags.
func normalize(s string) string {
return strings.ReplaceAll(s, "_", "-")
}
// Register adds a flag to local that targets the Value associated with the Flag named globalName in flag.CommandLine.
func Register(local *pflag.FlagSet, globalName string) {
if f := flag.CommandLine.Lookup(globalName); f != nil {
pflagFlag := pflag.PFlagFromGoFlag(f)
pflagFlag.Name = normalize(pflagFlag.Name)
local.AddFlag(pflagFlag)
} else {
panic(fmt.Sprintf("failed to find flag in global flagset (flag): %s", globalName))
}
}
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