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flags.ValidValueOrExit and os.Exit on Help

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This commit is contained in:
bth 2026-01-18 20:17:40 -08:00
commit c19b11e115
5 changed files with 32 additions and 24 deletions
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12
flags/flags.go
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@ -52,15 +52,20 @@ func HasDashPrefix(s string) bool {
return strings.HasPrefix(s, "-")
}
func MissingValueArg(args []string, i int) bool {
func MissingValue(args []string, i int) bool {
return i+1 == len(args) || HasDashPrefix(args[i+1])
}
func HelpMissingVal(flag string) {
fmt.Printf("%s needs a value assignment\n", flag)
// if no value ahead in the args, print error and exit
func ValidValueOrExit(args []string, i int) {
if MissingValue(args, i) {
fmt.Printf("%s needs a value assignment\n", args[i])
os.Exit(1)
}
}
// print out help string by reflecting over fields of provided opts struct
// and os.Exit(0)
func Help(subcmd string, opts any) {
v := reflect.ValueOf(opts)
t := v.Type()
@ -89,4 +94,5 @@ func Help(subcmd string, opts any) {
}
fmt.Printf("um %s%s\n", subcmd, positional)
w.Flush()
os.Exit(0)
}