dualfroz
544f3ffc57
BoolWithInverseFlag.String picked - or -- with len(name) == 1, which counts bytes, while the rest of the library uses prefixFor, which counts runes. a one-character non-ascii name or alias was shown as --ü in its help and as -ü for any other flag.
299 lines
9.6 KiB
Go
299 lines
9.6 KiB
Go
package cli
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import (
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"context"
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"fmt"
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"slices"
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"strings"
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)
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var DefaultInverseBoolPrefix = "no-"
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type BoolWithInverseFlag struct {
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Name string `json:"name"` // name of the flag
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Category string `json:"category"` // category of the flag, if any
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DefaultText string `json:"defaultText"` // default text of the flag for usage purposes
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HideDefault bool `json:"hideDefault"` // whether to hide the default value in output
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Usage string `json:"usage"` // usage string for help output
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Sources ValueSourceChain `json:"-"` // sources to load flag value from
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Required bool `json:"required"` // whether the flag is required or not
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Hidden bool `json:"hidden"` // whether to hide the flag in help output
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Deprecated string `json:"deprecated"` // deprecation message, if set a warning is printed when the flag is set
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Local bool `json:"local"` // whether the flag needs to be applied to subcommands as well
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Value bool `json:"defaultValue"` // default value for this flag if not set by from any source
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Destination *bool `json:"-"` // destination pointer for value when set
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Aliases []string `json:"aliases"` // Aliases that are allowed for this flag
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TakesFile bool `json:"takesFileArg"` // whether this flag takes a file argument, mainly for shell completion purposes
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Action func(context.Context, *Command, bool) error `json:"-"` // Action callback to be called when flag is set
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OnlyOnce bool `json:"onlyOnce"` // whether this flag can be duplicated on the command line
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Validator func(bool) error `json:"-"` // custom function to validate this flag value
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ValidateDefaults bool `json:"validateDefaults"` // whether to validate defaults or not
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Config BoolConfig `json:"config"` // Additional/Custom configuration associated with this flag type
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InversePrefix string `json:"invPrefix"` // The prefix used to indicate a negative value. Default: `env` becomes `no-env`
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// unexported fields for internal use
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count int // number of times the flag has been set
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hasBeenSet bool // whether the flag has been set from env or file
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fromSource bool // whether the current value came from Sources
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applied bool // whether the flag has been applied to a flag set already
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value Value // value representing this flag's value
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pset bool
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nset bool
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stringer FlagStringFunc // optional per-flag override of FlagStringer
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}
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// SetStringer overrides the [FlagStringFunc] used by this flag's String
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// method. Passing nil restores the default behavior of using the
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// package-level [FlagStringer]. This is used e.g. by
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// [MutuallyExclusiveFlags.Stringer].
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//
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// Note: unlike [FlagBase], BoolWithInverseFlag.String only honors the
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// stringer partially. The names segment (the part before the first tab,
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// e.g. "--[no-]env, -e") is always recomputed from Name/Aliases/InversePrefix
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// and cannot be overridden; only the tab-delimited details after it come
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// from the stringer's output.
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func (bif *BoolWithInverseFlag) SetStringer(s FlagStringFunc) {
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bif.stringer = s
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}
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func (bif *BoolWithInverseFlag) IsSet() bool {
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return bif.hasBeenSet
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}
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func (bif *BoolWithInverseFlag) Get() any {
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return bif.value.Get()
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}
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func (bif *BoolWithInverseFlag) RunAction(ctx context.Context, cmd *Command) error {
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if bif.Action != nil {
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return bif.Action(ctx, cmd, bif.Get().(bool))
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}
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return nil
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}
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func (bif *BoolWithInverseFlag) IsLocal() bool {
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return bif.Local
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}
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func (bif *BoolWithInverseFlag) inversePrefix() string {
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if bif.InversePrefix == "" {
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bif.InversePrefix = DefaultInverseBoolPrefix
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}
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return bif.InversePrefix
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}
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func (bif *BoolWithInverseFlag) PreParse() error {
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dest := bif.Destination
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if dest == nil {
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dest = new(bool)
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}
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*dest = bif.Value
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bif.value = &boolValue{
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destination: dest,
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count: bif.Config.Count,
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}
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// Validate the given default or values set from external sources as well
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if bif.Validator != nil && bif.ValidateDefaults {
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if err := bif.Validator(bif.value.Get().(bool)); err != nil {
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return err
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}
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}
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bif.applied = true
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return nil
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}
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func (bif *BoolWithInverseFlag) PostParse() error {
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tracef("postparse (flag=%[1]q)", bif.Name)
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if !bif.hasBeenSet {
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if val, source, found := bif.Sources.LookupWithSource(); found {
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if val == "" {
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val = "false"
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}
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if err := bif.Set(bif.Name, val); err != nil {
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return fmt.Errorf(
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"could not parse %[1]q as %[2]T value from %[3]s for flag %[4]s: %[5]s",
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val, bif.Value, source, bif.Name, err,
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)
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}
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bif.hasBeenSet = true
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bif.fromSource = true
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}
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}
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return nil
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}
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func (bif *BoolWithInverseFlag) Set(name, val string) error {
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// A value from Sources is only a fallback, so a value set afterwards
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// replaces it (see FlagBase.Set).
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if bif.fromSource {
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bif.fromSource = false
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bif.count = 0
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bif.pset = false
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bif.nset = false
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}
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if bif.count > 0 && bif.OnlyOnce {
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return fmt.Errorf("can't duplicate this flag")
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}
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bif.hasBeenSet = true
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if slices.Contains(append([]string{bif.Name}, bif.Aliases...), name) {
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if bif.nset {
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return fmt.Errorf("cannot set both flags `--%s` and `--%s`", bif.Name, bif.inversePrefix()+bif.Name)
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}
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if err := bif.value.Set(val); err != nil {
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return err
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}
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bif.pset = true
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} else {
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if bif.pset {
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return fmt.Errorf("cannot set both flags `--%s` and `--%s`", bif.Name, bif.inversePrefix()+bif.Name)
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}
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if err := bif.value.Set("false"); err != nil {
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return err
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}
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bif.nset = true
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}
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bif.count++
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if bif.Validator != nil {
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return bif.Validator(bif.value.Get().(bool))
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}
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return nil
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}
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func (bif *BoolWithInverseFlag) Names() []string {
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names := append([]string{bif.Name}, bif.Aliases...)
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for _, name := range names {
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names = append(names, bif.inversePrefix()+name)
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}
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return names
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}
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func (bif *BoolWithInverseFlag) IsRequired() bool {
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return bif.Required
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}
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func (bif *BoolWithInverseFlag) IsVisible() bool {
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return !bif.Hidden
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}
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// String implements the standard Stringer interface.
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//
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// Example for BoolFlag{Name: "env"}
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// --[no-]env (default: false)
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//
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// Example for BoolFlag{Name: "env", Aliases: []string{"e"}}
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// --[no-]env, -e (default: false)
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func (bif *BoolWithInverseFlag) String() string {
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fs := FlagStringer
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if bif.stringer != nil {
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fs = bif.stringer
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}
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out := fs(bif)
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i := strings.Index(out, "\t")
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// single character flags are prefixed with `-` instead of `--`
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prefix := prefixFor(bif.Name)
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// Guard against a FlagStringer that returns a string without a tab (e.g.
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// a custom stringer or the default stringer when the flag does not
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// implement DocGenerationFlag). In that case treat the entire output as
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// the tab-delimited suffix so the slice never goes out of bounds.
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if i < 0 {
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i = 0
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}
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var aliasParts []string
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for _, alias := range bif.Aliases {
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aliasParts = append(aliasParts, prefixFor(alias)+alias)
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}
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names := fmt.Sprintf("%s[%s]%s", prefix, bif.inversePrefix(), bif.Name)
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if len(aliasParts) > 0 {
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names = names + ", " + strings.Join(aliasParts, ", ")
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}
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return fmt.Sprintf("%s%s", names, out[i:])
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}
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// IsBoolFlag returns whether the flag doesn't need to accept args
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func (bif *BoolWithInverseFlag) IsBoolFlag() bool {
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return true
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}
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// Count returns the number of times this flag has been invoked
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func (bif *BoolWithInverseFlag) Count() int {
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return bif.count
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}
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// GetDefaultText returns the default text for this flag
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func (bif *BoolWithInverseFlag) GetDefaultText() string {
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if bif.DefaultText != "" {
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return bif.DefaultText
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}
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return boolValue{}.ToString(bif.Value)
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}
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// GetDeprecated returns the deprecation message of the flag
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func (bif *BoolWithInverseFlag) GetDeprecated() string {
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return bif.Deprecated
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}
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// GetCategory returns the category of the flag
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func (bif *BoolWithInverseFlag) GetCategory() string {
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return bif.Category
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}
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func (bif *BoolWithInverseFlag) SetCategory(c string) {
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bif.Category = c
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}
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// GetUsage returns the usage string for the flag
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func (bif *BoolWithInverseFlag) GetUsage() string {
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return bif.Usage
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}
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// GetEnvVars returns the env vars for this flag
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func (bif *BoolWithInverseFlag) GetEnvVars() []string {
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return bif.Sources.EnvKeys()
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}
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// GetValue returns the flags value as string representation and an empty
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// string if the flag takes no value at all.
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func (bif *BoolWithInverseFlag) GetValue() string {
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return ""
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}
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func (bif *BoolWithInverseFlag) TakesValue() bool {
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return false
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}
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// IsDefaultVisible returns true if the flag is not hidden, otherwise false
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func (bif *BoolWithInverseFlag) IsDefaultVisible() bool {
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return !bif.HideDefault
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}
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// TypeName is used for stringify/docs. For bool its a no-op
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func (bif *BoolWithInverseFlag) TypeName() string {
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return "bool"
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}
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func (bif *BoolWithInverseFlag) SchemaType() string {
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return "boolean"
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}
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func (bif *BoolWithInverseFlag) SchemaItemsType() string {
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return ""
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}
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