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37 lines
722 B
Go
37 lines
722 B
Go
package flagutil
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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)
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// Usage prints s and optional description for all the flags if -h or -help flag is passed to the app.
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func Usage(s string) {
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f := flag.CommandLine.Output()
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fmt.Fprintf(f, "%s\n", s)
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if hasHelpFlag(os.Args[1:]) {
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flag.PrintDefaults()
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} else {
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fmt.Fprintf(f, `Run "%s -help" in order to see the description for all the available flags`+"\n", os.Args[0])
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}
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}
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func hasHelpFlag(args []string) bool {
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for _, arg := range args {
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if isHelpArg(arg) {
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return true
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}
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}
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return false
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}
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func isHelpArg(arg string) bool {
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if !strings.HasPrefix(arg, "-") {
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return false
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}
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arg = strings.TrimPrefix(arg[1:], "-")
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return arg == "h" || arg == "help"
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}
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