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flags: factor AddFlagsFromOptions from cmd

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This is in preparation for generalising the backend config
This commit is contained in:
Nick Craig-Wood 2024-07-01 18:09:58 +01:00
parent 671a15f65f
commit c6ab37a59f
2 changed files with 46 additions and 51 deletions
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33
cmd/cmd.go
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@ -522,41 +522,12 @@ var backendFlags map[string]struct{}
func AddBackendFlags() {
backendFlags = map[string]struct{}{}
for _, fsInfo := range fs.Registry {
done := map[string]struct{}{}
flags.AddFlagsFromOptions(pflag.CommandLine, fsInfo.Prefix, fsInfo.Options)
// Store the backend flag names for the help generator
for i := range fsInfo.Options {
opt := &fsInfo.Options[i]
// Skip if done already (e.g. with Provider options)
if _, doneAlready := done[opt.Name]; doneAlready {
continue
}
done[opt.Name] = struct{}{}
// Make a flag from each option
name := opt.FlagName(fsInfo.Prefix)
found := pflag.CommandLine.Lookup(name) != nil
if !found {
// Take first line of help only
help := strings.TrimSpace(opt.Help)
if nl := strings.IndexRune(help, '\n'); nl >= 0 {
help = help[:nl]
}
help = strings.TrimRight(strings.TrimSpace(help), ".!?")
if opt.IsPassword {
help += " (obscured)"
}
flag := pflag.CommandLine.VarPF(opt, name, opt.ShortOpt, help)
flags.SetDefaultFromEnv(pflag.CommandLine, name)
if _, isBool := opt.Default.(bool); isBool {
flag.NoOptDefVal = "true"
}
// Hide on the command line if requested
if opt.Hide&fs.OptionHideCommandLine != 0 {
flag.Hidden = true
}
backendFlags[name] = struct{}{}
} else {
fs.Errorf(nil, "Not adding duplicate flag --%s", name)
}
// flag.Hidden = true
}
}
}

62
fs/config/flags/flags.go
View File

@ -151,7 +151,7 @@ func installFlag(flags *pflag.FlagSet, name string, groupsString string) {
}
// Add flag to Group if it is a global flag
if flags == pflag.CommandLine {
if groupsString != "" && flags == pflag.CommandLine {
for _, groupName := range strings.Split(groupsString, ",") {
if groupName == "rc-" {
groupName = "RC"
@ -165,24 +165,6 @@ func installFlag(flags *pflag.FlagSet, name string, groupsString string) {
}
}
// SetDefaultFromEnv constructs a name from the flag passed in and
// sets the default from the environment if possible
//
// Used to create backend flags like --skip-links
func SetDefaultFromEnv(flags *pflag.FlagSet, name string) {
envKey := fs.OptionToEnv(name)
envValue, found := os.LookupEnv(envKey)
if found {
flag := flags.Lookup(name)
if flag == nil {
log.Fatalf("Couldn't find flag --%q", name)
}
fs.Debugf(nil, "Setting default for %s=%q from environment variable %s", name, envValue, envKey)
//err = tempValue.Set()
flag.DefValue = envValue
}
}
// StringP defines a flag which can be set by an environment variable
//
// It is a thin wrapper around pflag.StringP
@ -350,3 +332,45 @@ func CountVarP(flags *pflag.FlagSet, p *int, name, shorthand string, usage strin
flags.CountVarP(p, name, shorthand, usage)
installFlag(flags, name, groups)
}
// AddFlagsFromOptions takes a slice of fs.Option and adds flags for all of them
func AddFlagsFromOptions(flags *pflag.FlagSet, prefix string, options fs.Options) {
done := map[string]struct{}{}
for i := range options {
opt := &options[i]
// Skip if done already (e.g. with Provider options)
if _, doneAlready := done[opt.Name]; doneAlready {
continue
}
done[opt.Name] = struct{}{}
// Make a flag from each option
if prefix == "" {
opt.NoPrefix = true
}
name := opt.FlagName(prefix)
found := flags.Lookup(name) != nil
if !found {
// Take first line of help only
help := strings.TrimSpace(opt.Help)
if nl := strings.IndexRune(help, '\n'); nl >= 0 {
help = help[:nl]
}
help = strings.TrimRight(strings.TrimSpace(help), ".!?")
if opt.IsPassword {
help += " (obscured)"
}
flag := flags.VarPF(opt, name, opt.ShortOpt, help)
installFlag(flags, name, opt.Groups)
if _, isBool := opt.Default.(bool); isBool {
flag.NoOptDefVal = "true"
}
// Hide on the command line if requested
if opt.Hide&fs.OptionHideCommandLine != 0 {
flag.Hidden = true
}
} else {
fs.Errorf(nil, "Not adding duplicate flag --%s", name)
}
// flag.Hidden = true
}
}