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Overview ¶
Package posflag implements a koanf.Provider that reads commandline parameters as conf maps using spf13/pflag, a POSIX compliant alternative to Go's stdlib flag package.
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Constants ¶
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Variables ¶
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Functions ¶
Types ¶
type Posflag ¶
type Posflag struct {
// contains filtered or unexported fields
}
Posflag implements a pflag command line provider.
func Provider ¶
Provider returns a commandline flags provider that returns a nested map[string]interface{} of environment variable where the nesting hierarchy of keys are defined by delim. For instance, the delim "." will convert the key `parent.child.key: 1` to `{parent: {child: {key: 1}}}`.
It takes an optional (but recommended) Koanf instance to see if the the flags defined have been set from other providers, for instance, a config file. If they are not, then the default values of the flags are merged. If they do exist, the flag values are not merged but only the values that have been explicitly set in the command line are merged.
func ProviderWithFlag ¶ added in v1.3.2
func ProviderWithFlag(f *pflag.FlagSet, delim string, ko *koanf.Koanf, cb func(f *pflag.Flag) (string, interface{})) *Posflag
ProviderWithFlag takes pflag.FlagSet and a callback that takes *pflag.Flag and applies the callback to all items in the flagset. It does not parse pflag.Flag values and expects the callback to process the keys and values from *pflag.Flag however. FlagVal() can be used in the callbakc to avoid repeating the type-switch block for parsing values. Returning "" for the key causes the particular flag to be disregarded.
Example:
p := posflag.ProviderWithFlag(flagset, ".", ko, func(f *pflag.Flag) (string, interface{}) {
// Transform the key in whatever manner.
key := f.Name
// Use FlagVal() and then transform the value, or don't use it at all
// and add custom logic to parse the value.
val := posflag.FlagVal(flagset, f)
return key, val
})
func ProviderWithValue ¶ added in v0.16.0
func ProviderWithValue(f *pflag.FlagSet, delim string, ko *koanf.Koanf, cb func(key string, value string) (string, interface{})) *Posflag
ProviderWithValue works exactly the same as Provider except the callback takes a (key, value) with the variable name and value and allows their modification. This is useful for cases where complex types like slices separated by custom separators. Returning "" for the key causes the particular flag to be disregarded.
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