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flag_str.go
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/
flag_str.go
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package eflag
import (
"os"
"strings"
)
// StringFlag is a string flag implements of Flag interface.
type StringFlag struct {
Name string
Usage string
EnvVar string
Default string
Variable *string
Action func(string, *FlagSet)
}
// Apply implements of Flag Apply function.
func (f *StringFlag) Apply(set *FlagSet) {
for _, field := range strings.Split(f.Name, ",") {
field = strings.TrimSpace(field)
if f.Variable != nil {
set.FlagSet.StringVar(f.Variable, field, getValueByEnvAndDefaultStrValue(f.EnvVar, f.Default), f.Usage)
}
set.FlagSet.String(field, getValueByEnvAndDefaultStrValue(f.EnvVar, f.Default), f.Usage)
set.actions[field] = f.Action
}
}
func getValueByEnvAndDefaultStrValue(envVar string, defaultValue string) string {
env := os.Getenv(envVar)
if env != "" {
return env
}
return defaultValue
}