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Add only missing persistent flags of parents in mergePersistentFlags

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As persistent flags of parents can only be added, we don't need to always
check them every time, so make updateParentsPflags return only added flags.

Performance improvement:
benchmark                     old ns/op     new ns/op     delta
BenchmarkInheritedFlags-4     5595          4412          -21.14%
BenchmarkLocalFlags-4         3235          2667          -17.56%

benchmark                     old allocs     new allocs     delta
BenchmarkInheritedFlags-4     39             24             -38.46%
BenchmarkLocalFlags-4         21             15             -28.57%

benchmark                     old bytes     new bytes     delta
BenchmarkInheritedFlags-4     1000          600           -40.00%
BenchmarkLocalFlags-4         544           408           -25.00%
This commit is contained in:
Albert Nigmatzianov 2017-04-06 15:28:17 +02:00
parent 6202b5942b
commit 3d89ed4908
2 changed files with 32 additions and 19 deletions
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2
cobra_test.go
View file

@ -675,7 +675,7 @@ func TestPersistentFlags(t *testing.T) {
fullSetupTest("echo times -s again -c -p test here")
if strings.Join(tt, " ") != "test here" {
t.Errorf("flags didn't leave proper args remaining..%s given", tt)
t.Errorf("flags didn't leave proper args remaining. %s given", tt)
}
if flags1 != "again" {

49
command.go
View file

@ -772,6 +772,7 @@ func (c *Command) initHelpCmd() {
func (c *Command) ResetCommands() {
c.commands = nil
c.helpCommand = nil
c.parentsPflags = nil
}
// Sorts commands by their names.
@ -1083,7 +1084,6 @@ func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
// LocalFlags returns the local FlagSet specifically set in the current command.
func (c *Command) LocalFlags() *flag.FlagSet {
c.mergePersistentFlags()
c.updateParentsPersistentFlags()
if c.lflags == nil {
c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@ -1106,7 +1106,6 @@ func (c *Command) LocalFlags() *flag.FlagSet {
// InheritedFlags returns all flags which were inherited from parents commands.
func (c *Command) InheritedFlags() *flag.FlagSet {
c.mergePersistentFlags()
c.updateParentsPersistentFlags()
if c.iflags == nil {
c.iflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
@ -1226,10 +1225,37 @@ func (c *Command) Parent() *Command {
return c.parent
}
func (c *Command) updateParentsPersistentFlags() {
// mergePersistentFlags merges c.PersistentFlags() to c.Flags()
// and adds missing persistent flags of all parents.
func (c *Command) mergePersistentFlags() {
if c.HasPersistentFlags() {
c.PersistentFlags().VisitAll(func(f *flag.Flag) {
if c.Flags().Lookup(f.Name) == nil {
c.Flags().AddFlag(f)
}
})
}
added := c.updateParentsPflags()
if len(added) > 0 {
for _, f := range added {
if c.Flags().Lookup(f.Name) == nil {
c.Flags().AddFlag(f)
}
}
}
}
// updateParentsPflags updates c.parentsPflags by adding
// new persistent flags of all parents and returns added flags.
// If c.parentsPflags == nil, it makes new.
//
// This function must be used ONLY in mergePersistentFlags.
func (c *Command) updateParentsPflags() (added []*flag.Flag) {
if c.parentsPflags == nil {
c.parentsPflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
c.parentsPflags.SetOutput(c.OutOrStderr())
c.parentsPflags.SortFlags = false
}
c.VisitParents(func(x *Command) {
@ -1237,24 +1263,11 @@ func (c *Command) updateParentsPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if c.parentsPflags.Lookup(f.Name) == nil {
c.parentsPflags.AddFlag(f)
added = append(added, f)
}
})
}
})
}
func (c *Command) mergePersistentFlags() {
flags := c.Flags()
merge := func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if flags.Lookup(f.Name) == nil {
flags.AddFlag(f)
}
})
}
}
merge(c)
c.VisitParents(merge)
return added
}