How can I replace dashes/hyphens in flag names with underscores?

[sagikazarmark]

Flags are usually in the form of this-is-a-flag whereas Viper keys are usually dot notated.

[sagikazarmark]

Answered by @megapctr in #1044 (comment):

I found a solution, this issue is just for folks who may also be struggling with this. Feel free to close it, unless you think it's worth mentioning in the readme.

I wanted to keep my CLI flags in kebab-case and my config keys in snake_case. I've been searching for something like EnvKeyReplacer but for flags. Turns out pflag.FlagSet has a function for normalizing flag names.

This solved my issue:

// bind cmd flags to viper, replacing dashes with underscores
f := cmd.Flags()
normalizeFunc := f.GetNormalizeFunc()
f.SetNormalizeFunc(func(fs *pflag.FlagSet, name string) pflag.NormalizedName {
    result := normalizeFunc(fs, name)
    name = strings.ReplaceAll(string(result), "-", "_")
    return pflag.NormalizedName(name)
 })
 viper.BindPFlags(f)

I found a solution, this issue is just for folks who may also be struggling with this. Feel free to close it, unless you think it's worth mentioning in the readme.

I wanted to keep my CLI flags in kebab-case and my config keys in snake_case. I've been searching for something like EnvKeyReplacer but for flags. Turns out pflag.FlagSet has a function for normalizing flag names.

This solved my issue:

// bind cmd flags to viper, replacing dashes with underscores
f := cmd.Flags()
normalizeFunc := f.GetNormalizeFunc()
f.SetNormalizeFunc(func(fs *pflag.FlagSet, name string) pflag.NormalizedName {
    result := normalizeFunc(fs, name)
    name = strings.ReplaceAll(string(result), "-", "_")
    return pflag.NormalizedName(name)
 })
 viper.BindPFlags(f)

[ffalor]

When I do this for persistent flags the flag names are changed breaking subcommands. Does this only work for regular flags or am I doing something wrong.

Nvm.. just not going to use cobra lol.

Thanks!