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flag: make zero FlagSet useful

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This makes it possible to use a FlagSet as a
field in a larger struct.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5036041
This commit is contained in:
Russ Cox 2011-09-15 17:04:51 -04:00
parent bb0c8b3b66
commit 1505cae05d
2 changed files with 21 additions and 4 deletions
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22
src/pkg/flag/flag.go
View File

@ -286,6 +286,9 @@ func (f *FlagSet) Set(name, value string) bool {
if !ok {
return false
}
if f.actual == nil {
f.actual = make(map[string]*Flag)
}
f.actual[name] = flag
return true
}
@ -559,6 +562,9 @@ func (f *FlagSet) Var(value Value, name string, usage string) {
fmt.Fprintf(os.Stderr, "%s flag redefined: %s\n", f.name, name)
panic("flag redefinition") // Happens only if flags are declared with identical names
}
if f.formal == nil {
f.formal = make(map[string]*Flag)
}
f.formal[name] = flag
}
@ -586,6 +592,8 @@ func (f *FlagSet) failf(format string, a ...interface{}) os.Error {
func (f *FlagSet) usage() {
if f == commandLine {
Usage()
} else if f.Usage == nil {
defaultUsage(f)
} else {
f.Usage()
}
@ -657,6 +665,9 @@ func (f *FlagSet) parseOne() (bool, os.Error) {
return false, f.failf("invalid value %q for flag: -%s", value, name)
}
}
if f.actual == nil {
f.actual = make(map[string]*Flag)
}
f.actual[name] = flag
return true, nil
}
@ -713,10 +724,15 @@ var commandLine = NewFlagSet(os.Args[0], ExitOnError)
func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet {
f := &FlagSet{
name: name,
actual: make(map[string]*Flag),
formal: make(map[string]*Flag),
errorHandling: errorHandling,
}
f.Usage = func() { defaultUsage(f) }
return f
}
// Init sets the name and error handling property for a flag set.
// By default, the zero FlagSet uses an empty name and the
// ContinueOnError error handling policy.
func (f *FlagSet) Init(name string, errorHandling ErrorHandling) {
f.name = name
f.errorHandling = errorHandling
}

3
src/pkg/flag/flag_test.go
View File

@ -180,7 +180,8 @@ func (f *flagVar) Set(value string) bool {
}
func TestUserDefined(t *testing.T) {
flags := NewFlagSet("test", ContinueOnError)
var flags FlagSet
flags.Init("test", ContinueOnError)
var v flagVar
flags.Var(&v, "v", "usage")
if err := flags.Parse([]string{"-v", "1", "-v", "2", "-v=3"}); err != nil {