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Explicitly support local flags overwriting persistent/inherited flags

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The current (desired) behavior when a Command specifies a flag that
has the same name as a persistent/inherited flag, is that the local
definition takes precedence. This change updates the various
Flag subset functions to respect that behavior:
* LocalFlags: now returns only the set of flags and persistent flags
  attached to the Command itself.
* InheritedFlags: now returns only the set of persistent flags inherited
  from the Command's parent(s), excluding any that are overwritten by a
  local flag.
* NonInheritedFlags: changed to an alias of LocalFlags.
* AllPersistentFlags: removed as not very useful; it returned the set
  of all persistent flags attached to the Command and its parent(s).

Default UsageTemplate updated to use LocalFlags and InheritedFlags
This commit is contained in:
Jeff Lowdermilk 2015-02-27 16:26:56 -08:00 committed by Brendan Burns
parent f8e1ec56bd
commit 5c9146990b
2 changed files with 84 additions and 66 deletions
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46
cobra_test.go
View file

@ -11,11 +11,14 @@ var _ = fmt.Println
var tp, te, tt, t1 []string
var flagb1, flagb2, flagb3, flagbr bool
var flags1, flags2, flags3 string
var flags1, flags2a, flags2b, flags3 string
var flagi1, flagi2, flagi3, flagir int
var globalFlag1 bool
var flagEcho, rootcalled bool
const strtwoParentHelp = "help message for parent flag strtwo"
const strtwoChildHelp = "help message for child flag strtwo"
var cmdPrint = &Command{
Use: "print [string to print]",
Short: "Print anything to the screen",
@ -72,11 +75,12 @@ func flagInit() {
cmdRootNoRun.ResetFlags()
cmdRootSameName.ResetFlags()
cmdRootWithRun.ResetFlags()
cmdRootNoRun.PersistentFlags().StringVarP(&flags2a, "strtwo", "t", "two", strtwoParentHelp)
cmdEcho.Flags().IntVarP(&flagi1, "intone", "i", 123, "help message for flag intone")
cmdTimes.Flags().IntVarP(&flagi2, "inttwo", "j", 234, "help message for flag inttwo")
cmdPrint.Flags().IntVarP(&flagi3, "intthree", "i", 345, "help message for flag intthree")
cmdEcho.PersistentFlags().StringVarP(&flags1, "strone", "s", "one", "help message for flag strone")
cmdTimes.PersistentFlags().StringVarP(&flags2, "strtwo", "t", "two", "help message for flag strtwo")
cmdTimes.PersistentFlags().StringVarP(&flags2b, "strtwo", "t", "2", strtwoChildHelp)
cmdPrint.PersistentFlags().StringVarP(&flags3, "strthree", "s", "three", "help message for flag strthree")
cmdEcho.Flags().BoolVarP(&flagb1, "boolone", "b", true, "help message for flag boolone")
cmdTimes.Flags().BoolVarP(&flagb2, "booltwo", "c", false, "help message for flag booltwo")
@ -381,6 +385,17 @@ func TestChildCommandFlags(t *testing.T) {
t.Errorf("Wrong error message displayed, \n %s", r.Output)
}
// Testing with persistent flag overwritten by child
noRRSetupTest("echo times --strtwo=child one two")
if flags2b != "child" {
t.Errorf("flag value should be child, %s given", flags2b)
}
if flags2a != "two" {
t.Errorf("unset flag should have default value, expecting two, given %s", flags2a)
}
// Testing flag with invalid input
r = noRRSetupTest("echo -i10E")
@ -437,6 +452,13 @@ func TestHelpCommand(t *testing.T) {
checkResultContains(t, r, cmdTimes.Long)
}
func TestChildCommandHelp(t *testing.T) {
c := noRRSetupTest("print --help")
checkResultContains(t, c, strtwoParentHelp)
r := noRRSetupTest("echo times --help")
checkResultContains(t, r, strtwoChildHelp)
}
func TestRunnableRootCommand(t *testing.T) {
fullSetupTest("")
@ -486,6 +508,26 @@ func TestRootHelp(t *testing.T) {
}
func TestFlagAccess(t *testing.T) {
initialize()
local := cmdTimes.LocalFlags()
inherited := cmdTimes.InheritedFlags()
for _, f := range []string{"inttwo", "strtwo", "booltwo"} {
if local.Lookup(f) == nil {
t.Errorf("LocalFlags expected to contain %s, Got: nil", f)
}
}
if inherited.Lookup("strone") == nil {
t.Errorf("InheritedFlags expected to contain strone, Got: nil")
}
if inherited.Lookup("strtwo") != nil {
t.Errorf("InheritedFlags shouldn not contain overwritten flag strtwo")
}
}
func TestRootNoCommandHelp(t *testing.T) {
x := rootOnlySetupTest("--help")

104
command.go
View file

@ -46,6 +46,8 @@ type Command struct {
flags *flag.FlagSet
// Set of flags childrens of this command will inherit
pflags *flag.FlagSet
// Flags that are declared specifically by this command (not inherited).
lflags *flag.FlagSet
// Run runs the command.
// The args are the arguments after the command name.
Run func(cmd *Command, args []string)
@ -218,8 +220,8 @@ Available Commands: {{range .Commands}}{{if .Runnable}}
{{end}}
{{ if .HasLocalFlags}}Flags:
{{.LocalFlags.FlagUsages}}{{end}}
{{ if .HasAnyPersistentFlags}}Global Flags:
{{.AllPersistentFlags.FlagUsages}}{{end}}{{if .HasParent}}{{if and (gt .Commands 0) (gt .Parent.Commands 1) }}
{{ if .HasInheritedFlags}}Global Flags:
{{.InheritedFlags.FlagUsages}}{{end}}{{if .HasParent}}{{if and (gt .Commands 0) (gt .Parent.Commands 1) }}
Additional help topics: {{if gt .Commands 0 }}{{range .Commands}}{{if not .Runnable}} {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if gt .Parent.Commands 1 }}{{range .Parent.Commands}}{{if .Runnable}}{{if not (eq .Name $cmd.Name) }}{{end}}
{{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{end}}
{{end}}{{ if .HasSubCommands }}
@ -726,14 +728,9 @@ func (c *Command) LocalFlags() *flag.FlagSet {
c.mergePersistentFlags()
local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
allPersistent := c.AllPersistentFlags()
c.Flags().VisitAll(func(f *flag.Flag) {
if allPersistent.Lookup(f.Name) == nil {
local.AddFlag(f)
}
c.lflags.VisitAll(func(f *flag.Flag) {
local.AddFlag(f)
})
return local
}
@ -741,44 +738,34 @@ func (c *Command) LocalFlags() *flag.FlagSet {
func (c *Command) InheritedFlags() *flag.FlagSet {
c.mergePersistentFlags()
local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
inherited := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
local := c.LocalFlags()
var rmerge func(x *Command)
var rmerge func(x *Command)
rmerge = func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if local.Lookup(f.Name) == nil {
local.AddFlag(f)
}
})
}
if x.HasParent() {
rmerge(x.parent)
}
}
rmerge = func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if inherited.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
inherited.AddFlag(f)
}
})
}
if x.HasParent() {
rmerge(x.parent)
}
}
if c.HasParent() {
rmerge(c.parent)
}
return local
return inherited
}
// All Flags which were not inherited from parent commands
func (c *Command) NonInheritedFlags() *flag.FlagSet {
c.mergePersistentFlags()
local := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
inheritedFlags := c.InheritedFlags()
c.Flags().VisitAll(func(f *flag.Flag) {
if inheritedFlags.Lookup(f.Name) == nil {
local.AddFlag(f)
}
})
return local
return c.LocalFlags()
}
// Get the Persistent FlagSet specifically set in the current command
@ -793,29 +780,6 @@ func (c *Command) PersistentFlags() *flag.FlagSet {
return c.pflags
}
// Get the Persistent FlagSet traversing the Command hierarchy
func (c *Command) AllPersistentFlags() *flag.FlagSet {
allPersistent := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
var visit func(x *Command)
visit = func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
if allPersistent.Lookup(f.Name) == nil {
allPersistent.AddFlag(f)
}
})
}
if x.HasParent() {
visit(x.parent)
}
}
visit(c)
return allPersistent
}
// For use in testing
func (c *Command) ResetFlags() {
c.flagErrorBuf = new(bytes.Buffer)
@ -836,16 +800,15 @@ func (c *Command) HasPersistentFlags() bool {
return c.PersistentFlags().HasFlags()
}
// Does the command hierarchy contain persistent flags
func (c *Command) HasAnyPersistentFlags() bool {
return c.AllPersistentFlags().HasFlags()
}
// Does the command has flags specifically declared locally
func (c *Command) HasLocalFlags() bool {
return c.LocalFlags().HasFlags()
}
func (c *Command) HasInheritedFlags() bool {
return c.InheritedFlags().HasFlags()
}
// Climbs up the command tree looking for matching flag
func (c *Command) Flag(name string) (flag *flag.Flag) {
flag = c.Flags().Lookup(name)
@ -892,6 +855,19 @@ func (c *Command) Parent() *Command {
func (c *Command) mergePersistentFlags() {
var rmerge func(x *Command)
// Save the set of local flags
if c.lflags == nil {
c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
if c.flagErrorBuf == nil {
c.flagErrorBuf = new(bytes.Buffer)
}
c.lflags.SetOutput(c.flagErrorBuf)
addtolocal := func(f *flag.Flag) {
c.lflags.AddFlag(f)
}
c.Flags().VisitAll(addtolocal)
c.PersistentFlags().VisitAll(addtolocal)
}
rmerge = func(x *Command) {
if x.HasPersistentFlags() {
x.PersistentFlags().VisitAll(func(f *flag.Flag) {