Created
February 13, 2021 14:36
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Golang custom flag usage
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| package main | |
| import ( | |
| "flag" | |
| "fmt" | |
| ) | |
| func main() { | |
| flag.String("a", "", "flag 1") | |
| flag.String("b", "", "flag 2") | |
| flag.String("c", "", "flag 3") | |
| flag.Usage = func() { | |
| flagSet := flag.CommandLine | |
| fmt.Printf("Usage of %s:\n", "./tool") | |
| order := []string{"a", "b", "c"} | |
| for _, name := range order { | |
| flag := flagSet.Lookup(name) | |
| fmt.Printf("-%s\t%s\n", flag.Name,flag.Usage) | |
| } | |
| } | |
| flag.Parse() | |
| } | |
| /* | |
| [ output ] | |
| Usage of ./tool: | |
| -a flag 1 | |
| -b flag 2 | |
| -c flag 3 | |
| */ |
What is the difference between this and flag.PrintDefaults()?
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works like a charm, thanks!