291 lines
9.2 KiB
Go
291 lines
9.2 KiB
Go
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// Copyright 2013-2023 The Cobra Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cobra
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import (
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"fmt"
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"sort"
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"strings"
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flag "github.com/spf13/pflag"
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)
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const (
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requiredAsGroup = "cobra_annotation_required_if_others_set"
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oneRequired = "cobra_annotation_one_required"
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mutuallyExclusive = "cobra_annotation_mutually_exclusive"
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)
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// MarkFlagsRequiredTogether marks the given flags with annotations so that Cobra errors
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// if the command is invoked with a subset (but not all) of the given flags.
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func (c *Command) MarkFlagsRequiredTogether(flagNames ...string) {
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c.mergePersistentFlags()
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for _, v := range flagNames {
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f := c.Flags().Lookup(v)
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if f == nil {
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panic(fmt.Sprintf("Failed to find flag %q and mark it as being required in a flag group", v))
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}
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if err := c.Flags().SetAnnotation(v, requiredAsGroup, append(f.Annotations[requiredAsGroup], strings.Join(flagNames, " "))); err != nil {
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// Only errs if the flag isn't found.
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panic(err)
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}
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}
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}
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// MarkFlagsOneRequired marks the given flags with annotations so that Cobra errors
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// if the command is invoked without at least one flag from the given set of flags.
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func (c *Command) MarkFlagsOneRequired(flagNames ...string) {
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c.mergePersistentFlags()
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for _, v := range flagNames {
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f := c.Flags().Lookup(v)
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if f == nil {
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panic(fmt.Sprintf("Failed to find flag %q and mark it as being in a one-required flag group", v))
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}
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if err := c.Flags().SetAnnotation(v, oneRequired, append(f.Annotations[oneRequired], strings.Join(flagNames, " "))); err != nil {
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// Only errs if the flag isn't found.
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panic(err)
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}
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}
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}
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// MarkFlagsMutuallyExclusive marks the given flags with annotations so that Cobra errors
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// if the command is invoked with more than one flag from the given set of flags.
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func (c *Command) MarkFlagsMutuallyExclusive(flagNames ...string) {
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c.mergePersistentFlags()
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for _, v := range flagNames {
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f := c.Flags().Lookup(v)
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if f == nil {
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panic(fmt.Sprintf("Failed to find flag %q and mark it as being in a mutually exclusive flag group", v))
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}
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// Each time this is called is a single new entry; this allows it to be a member of multiple groups if needed.
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if err := c.Flags().SetAnnotation(v, mutuallyExclusive, append(f.Annotations[mutuallyExclusive], strings.Join(flagNames, " "))); err != nil {
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panic(err)
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}
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}
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}
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// ValidateFlagGroups validates the mutuallyExclusive/oneRequired/requiredAsGroup logic and returns the
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// first error encountered.
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func (c *Command) ValidateFlagGroups() error {
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if c.DisableFlagParsing {
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return nil
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}
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flags := c.Flags()
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// groupStatus format is the list of flags as a unique ID,
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// then a map of each flag name and whether it is set or not.
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groupStatus := map[string]map[string]bool{}
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oneRequiredGroupStatus := map[string]map[string]bool{}
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mutuallyExclusiveGroupStatus := map[string]map[string]bool{}
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flags.VisitAll(func(pflag *flag.Flag) {
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processFlagForGroupAnnotation(flags, pflag, requiredAsGroup, groupStatus)
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processFlagForGroupAnnotation(flags, pflag, oneRequired, oneRequiredGroupStatus)
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processFlagForGroupAnnotation(flags, pflag, mutuallyExclusive, mutuallyExclusiveGroupStatus)
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})
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if err := validateRequiredFlagGroups(groupStatus); err != nil {
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return err
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}
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if err := validateOneRequiredFlagGroups(oneRequiredGroupStatus); err != nil {
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return err
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}
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if err := validateExclusiveFlagGroups(mutuallyExclusiveGroupStatus); err != nil {
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return err
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}
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return nil
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}
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func hasAllFlags(fs *flag.FlagSet, flagnames ...string) bool {
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for _, fname := range flagnames {
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f := fs.Lookup(fname)
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if f == nil {
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return false
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}
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}
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return true
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}
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func processFlagForGroupAnnotation(flags *flag.FlagSet, pflag *flag.Flag, annotation string, groupStatus map[string]map[string]bool) {
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groupInfo, found := pflag.Annotations[annotation]
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if found {
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for _, group := range groupInfo {
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if groupStatus[group] == nil {
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flagnames := strings.Split(group, " ")
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// Only consider this flag group at all if all the flags are defined.
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if !hasAllFlags(flags, flagnames...) {
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continue
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}
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groupStatus[group] = map[string]bool{}
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for _, name := range flagnames {
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groupStatus[group][name] = false
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}
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}
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groupStatus[group][pflag.Name] = pflag.Changed
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}
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}
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}
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func validateRequiredFlagGroups(data map[string]map[string]bool) error {
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keys := sortedKeys(data)
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for _, flagList := range keys {
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flagnameAndStatus := data[flagList]
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unset := []string{}
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for flagname, isSet := range flagnameAndStatus {
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if !isSet {
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unset = append(unset, flagname)
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}
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}
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if len(unset) == len(flagnameAndStatus) || len(unset) == 0 {
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continue
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}
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// Sort values, so they can be tested/scripted against consistently.
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sort.Strings(unset)
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return fmt.Errorf("if any flags in the group [%v] are set they must all be set; missing %v", flagList, unset)
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}
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return nil
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}
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func validateOneRequiredFlagGroups(data map[string]map[string]bool) error {
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keys := sortedKeys(data)
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for _, flagList := range keys {
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flagnameAndStatus := data[flagList]
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var set []string
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for flagname, isSet := range flagnameAndStatus {
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if isSet {
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set = append(set, flagname)
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}
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}
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if len(set) >= 1 {
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continue
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}
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// Sort values, so they can be tested/scripted against consistently.
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sort.Strings(set)
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return fmt.Errorf("at least one of the flags in the group [%v] is required", flagList)
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}
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return nil
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}
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func validateExclusiveFlagGroups(data map[string]map[string]bool) error {
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keys := sortedKeys(data)
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for _, flagList := range keys {
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flagnameAndStatus := data[flagList]
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var set []string
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for flagname, isSet := range flagnameAndStatus {
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if isSet {
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set = append(set, flagname)
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}
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}
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if len(set) == 0 || len(set) == 1 {
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continue
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}
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// Sort values, so they can be tested/scripted against consistently.
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sort.Strings(set)
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return fmt.Errorf("if any flags in the group [%v] are set none of the others can be; %v were all set", flagList, set)
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}
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return nil
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}
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func sortedKeys(m map[string]map[string]bool) []string {
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keys := make([]string, len(m))
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i := 0
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for k := range m {
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keys[i] = k
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i++
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}
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sort.Strings(keys)
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return keys
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}
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// enforceFlagGroupsForCompletion will do the following:
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// - when a flag in a group is present, other flags in the group will be marked required
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// - when none of the flags in a one-required group are present, all flags in the group will be marked required
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// - when a flag in a mutually exclusive group is present, other flags in the group will be marked as hidden
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// This allows the standard completion logic to behave appropriately for flag groups
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func (c *Command) enforceFlagGroupsForCompletion() {
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if c.DisableFlagParsing {
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return
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}
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flags := c.Flags()
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groupStatus := map[string]map[string]bool{}
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oneRequiredGroupStatus := map[string]map[string]bool{}
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mutuallyExclusiveGroupStatus := map[string]map[string]bool{}
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c.Flags().VisitAll(func(pflag *flag.Flag) {
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processFlagForGroupAnnotation(flags, pflag, requiredAsGroup, groupStatus)
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processFlagForGroupAnnotation(flags, pflag, oneRequired, oneRequiredGroupStatus)
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processFlagForGroupAnnotation(flags, pflag, mutuallyExclusive, mutuallyExclusiveGroupStatus)
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})
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// If a flag that is part of a group is present, we make all the other flags
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// of that group required so that the shell completion suggests them automatically
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for flagList, flagnameAndStatus := range groupStatus {
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for _, isSet := range flagnameAndStatus {
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if isSet {
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// One of the flags of the group is set, mark the other ones as required
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for _, fName := range strings.Split(flagList, " ") {
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_ = c.MarkFlagRequired(fName)
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}
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}
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}
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}
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// If none of the flags of a one-required group are present, we make all the flags
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// of that group required so that the shell completion suggests them automatically
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for flagList, flagnameAndStatus := range oneRequiredGroupStatus {
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set := 0
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for _, isSet := range flagnameAndStatus {
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if isSet {
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set++
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}
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}
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// None of the flags of the group are set, mark all flags in the group
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// as required
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if set == 0 {
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for _, fName := range strings.Split(flagList, " ") {
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_ = c.MarkFlagRequired(fName)
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}
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}
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}
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// If a flag that is mutually exclusive to others is present, we hide the other
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// flags of that group so the shell completion does not suggest them
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for flagList, flagnameAndStatus := range mutuallyExclusiveGroupStatus {
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for flagName, isSet := range flagnameAndStatus {
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if isSet {
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// One of the flags of the mutually exclusive group is set, mark the other ones as hidden
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// Don't mark the flag that is already set as hidden because it may be an
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// array or slice flag and therefore must continue being suggested
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for _, fName := range strings.Split(flagList, " ") {
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if fName != flagName {
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flag := c.Flags().Lookup(fName)
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flag.Hidden = true
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}
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}
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}
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}
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}
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}
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