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// SPDX-FileCopyrightText: 2020 Ethel Morgan
//
// SPDX-License-Identifier: MIT
/*
Package flag wraps Go's built-in flag package, with the addition of idiomatic custom flags.
Custom Flags
Custom flags are wrappers around Go's built-in string flags, with a parser
func. They can be used to parse custom flag types, or to have custom flag
validators, while keeping the parsing & validation with the flag's definition.
var (
urlFlag = flag.Custom("url", "", "url to GET", func(raw string) (interface{}, error) {
return url.Parse(raw)
})
outputFlag = flag.Custom("output", "", "output format", func(raw string) (interface{}, error) {
if !(raw == "table" || raw == "json") {
return nil, fmt.Errorf("must be either json or table, got %v", raw)
}
return raw, nil
})
)
func main() {
flag.Parse()
urlFlag := (*urlFlag).(*url.URL)
outputFlag := (*outputFlag).(string)
}
*/
package flag
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