package cli import "flag" // StringFlag is a flag with type string type StringFlag struct { Name string Usage string EnvVar string FilePath string Required bool Hidden bool TakesFile bool Value string Destination *string } // String returns a readable representation of this value // (for usage defaults) func (f StringFlag) String() string { return FlagStringer(f) } // GetName returns the name of the flag func (f StringFlag) GetName() string { return f.Name } // IsRequired returns whether or not the flag is required func (f StringFlag) IsRequired() bool { return f.Required } // TakesValue returns true of the flag takes a value, otherwise false func (f StringFlag) TakesValue() bool { return true } // GetUsage returns the usage string for the flag func (f StringFlag) GetUsage() string { return f.Usage } // GetValue returns the flags value as string representation and an empty // string if the flag takes no value at all. func (f StringFlag) GetValue() string { return f.Value } // Apply populates the flag given the flag set and environment // Ignores errors func (f StringFlag) Apply(set *flag.FlagSet) { _ = f.ApplyWithError(set) } // ApplyWithError populates the flag given the flag set and environment func (f StringFlag) ApplyWithError(set *flag.FlagSet) error { if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok { f.Value = envVal } eachName(f.Name, func(name string) { if f.Destination != nil { set.StringVar(f.Destination, name, f.Value, f.Usage) return } set.String(name, f.Value, f.Usage) }) return nil } // String looks up the value of a local StringFlag, returns // "" if not found func (c *Context) String(name string) string { return lookupString(name, c.flagSet) } // GlobalString looks up the value of a global StringFlag, returns // "" if not found func (c *Context) GlobalString(name string) string { if fs := lookupGlobalFlagSet(name, c); fs != nil { return lookupString(name, fs) } return "" } func lookupString(name string, set *flag.FlagSet) string { f := set.Lookup(name) if f != nil { parsed, err := f.Value.String(), error(nil) if err != nil { return "" } return parsed } return "" }