adding support for Float64SliceFlag

context.go

@@ -84,6 +84,15 @@ func (c *Context) Int64Slice(name string) []int64 {
 	return nil
 }
 
+// Float64Slice looks up the value of a local float64 slice flag, returns nil if no float
+// slice flag exists
+func (c *Context) Float64Slice(name string) []float64 {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupFloat64Slice(name, fs)
+	}
+	return nil
+}
+
 // Bool looks up the value of a local bool flag, returns false if no bool flag exists
 func (c *Context) Bool(name string) bool {
 	if fs := lookupFlagSet(name, c); fs != nil {
@@ -317,6 +326,14 @@ func lookupInt64Slice(name string, set *flag.FlagSet) []int64 {
 	return nil
 }
 
+func lookupFloat64Slice(name string, set *flag.FlagSet) []float64 {
+	f := set.Lookup(name)
+	if f != nil {
+		return (f.Value.(*Float64Slice)).Value()
+	}
+	return nil
+}
+
 func lookupGeneric(name string, set *flag.FlagSet) interface{} {
 	f := set.Lookup(name)
 	if f != nil {

flag.go

@@ -765,6 +765,111 @@ func (f *Float64Flag) Names() []string {
 	return flagNames(f)
 }
 
+
+
+
+// NewFloat64Slice makes a *Float64Slice with default values
+func NewFloat64Slice(defaults ...float64) *Float64Slice {
+	return &Float64Slice{slice: append([]float64{}, defaults...)}
+}
+
+
+// Float64Slice is an opaque type for []float64 to satisfy flag.Value
+type Float64Slice struct {
+	slice      []float64
+	hasBeenSet bool
+}
+
+// Set parses the value into a float64 and appends it to the list of values
+func (f *Float64Slice) Set(value string) error {
+	if !f.hasBeenSet {
+		f.slice = []float64{}
+		f.hasBeenSet = true
+	}
+
+	if strings.HasPrefix(value, slPfx) {
+		// Deserializing assumes overwrite
+		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
+		f.hasBeenSet = true
+		return nil
+	}
+
+	tmp, err := strconv.ParseFloat(value, 64)
+	if err != nil {
+		return err
+	}
+
+	f.slice = append(f.slice, tmp)
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (f *Float64Slice) String() string {
+	return fmt.Sprintf("%#v", f.slice)
+}
+
+// Serialized allows Float64Slice to fulfill Serializeder
+func (f *Float64Slice) Serialized() string {
+	jsonBytes, _ := json.Marshal(f.slice)
+	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
+}
+
+// Value returns the slice of float64s set by this flag
+func (f *Float64Slice) Value() []float64 {
+	return f.slice
+}
+
+// Float64SliceFlag is a float64 flag that can be specified multiple times on the
+// command-line
+type Float64SliceFlag struct {
+	Name    string
+	Aliases []string
+	Value   *Float64Slice
+	Usage   string
+	EnvVars []string
+	Hidden  bool
+}
+
+// String returns the usage
+func (f *Float64SliceFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Float64SliceFlag) Apply(set *flag.FlagSet) {
+	if f.EnvVars != nil {
+		for _, envVar := range f.EnvVars {
+			if envVal := os.Getenv(envVar); envVal != "" {
+				newVal := NewFloat64Slice()
+				for _, s := range strings.Split(envVal, ",") {
+					s = strings.TrimSpace(s)
+					err := newVal.Set(s)
+					if err != nil {
+						fmt.Fprintf(ErrWriter, err.Error())
+					}
+				}
+				f.Value = newVal
+				break
+			}
+		}
+	}
+
+	if f.Value == nil {
+		f.Value = NewFloat64Slice()
+	}
+
+	for _, name := range f.Names() {
+		set.Var(f.Value, name, f.Usage)
+	}
+}
+
+// Names returns the names of the flag.
+func (f *Float64SliceFlag) Names() []string {
+	return flagNames(f)
+}
+
+
+
 func visibleFlags(fl []Flag) []Flag {
 	visible := []Flag{}
 	for _, flag := range fl {
@@ -893,6 +998,9 @@ func stringifyFlag(f Flag) string {
 	case *Int64SliceFlag:
 		return withEnvHint(flagStringSliceField(f, "EnvVars"),
 			stringifyInt64SliceFlag(f.(*Int64SliceFlag)))
+	case *Float64SliceFlag:
+		return withEnvHint(flagStringSliceField(f, "EnvVars"),
+			stringifyFloat64SliceFlag(f.(*Float64SliceFlag)))
 	case *StringSliceFlag:
 		return withEnvHint(flagStringSliceField(f, "EnvVars"),
 			stringifyStringSliceFlag(f.(*StringSliceFlag)))
@@ -949,6 +1057,17 @@ func stringifyInt64SliceFlag(f *Int64SliceFlag) string {
 	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
 }
 
+func stringifyFloat64SliceFlag(f *Float64SliceFlag) string {
+	defaultVals := []string{}
+	if f.Value != nil && len(f.Value.Value()) > 0 {
+		for _, i := range f.Value.Value() {
+			defaultVals = append(defaultVals, strings.TrimRight(strings.TrimRight(fmt.Sprintf("%f", i), "0"), "."))
+		}
+	}
+
+	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
+}
+
 func stringifyStringSliceFlag(f *StringSliceFlag) string {
 	defaultVals := []string{}
 	if f.Value != nil && len(f.Value.Value()) > 0 {

flag_test.go

@@ -482,6 +482,49 @@ func TestFloat64FlagApply_SetsAllNames(t *testing.T) {
 	expect(t, v, float64(43.33333))
 }
 
+
+var float64SliceFlagTests = []struct {
+	name     string
+	aliases  []string
+	value    *Float64Slice
+	expected string
+}{
+	{"heads", nil, NewFloat64Slice(), "--heads value\t"},
+	{"H", nil, NewFloat64Slice(), "-H value\t"},
+	{"heads", []string{"H"}, NewFloat64Slice(float64(0.1234), float64(-10.5)),
+		"--heads value, -H value\t(default: 0.1234, -10.5)"},
+}
+
+func TestFloat64SliceFlagHelpOutput(t *testing.T) {
+	for _, test := range float64SliceFlagTests {
+		flag := Float64SliceFlag{Name: test.name, Aliases: test.aliases, Value: test.value}
+		output := flag.String()
+
+		if output != test.expected {
+			t.Errorf("%q does not match %q", output, test.expected)
+		}
+	}
+}
+
+func TestFloat64SliceFlagWithEnvVarHelpOutput(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("APP_SMURF", "0.1234,-10.5")
+	for _, test := range float64SliceFlagTests {
+		flag := Float64SliceFlag{Name: test.name, Value: test.value, EnvVars: []string{"APP_SMURF"}}
+		output := flag.String()
+
+		expectedSuffix := " [$APP_SMURF]"
+		if runtime.GOOS == "windows" {
+			expectedSuffix = " [%APP_SMURF%]"
+		}
+		if !strings.HasSuffix(output, expectedSuffix) {
+			t.Errorf("%q does not end with"+expectedSuffix, output)
+		}
+	}
+}
+
+
+
 var genericFlagTests = []struct {
 	name     string
 	value    Generic
@@ -1057,6 +1100,48 @@ func TestParseMultiFloat64FromEnvCascade(t *testing.T) {
 	a.Run([]string{"run"})
 }
 
+
+func TestParseMultiFloat64SliceFromEnv(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("APP_INTERVALS", "0.1,-10.5")
+
+	(&App{
+		Flags: []Flag{
+			&Float64SliceFlag{Name: "intervals", Aliases: []string{"i"}, Value: NewFloat64Slice(), EnvVars: []string{"APP_INTERVALS"}},
+		},
+		Action: func(ctx *Context) error {
+			if !reflect.DeepEqual(ctx.Float64Slice("intervals"), []float64{0.1, -10.5}) {
+				t.Errorf("main name not set from env")
+			}
+			if !reflect.DeepEqual(ctx.Float64Slice("i"), []float64{0.1, -10.5}) {
+				t.Errorf("short name not set from env")
+			}
+			return nil
+		},
+	}).Run([]string{"run"})
+}
+
+func TestParseMultiFloat64SliceFromEnvCascade(t *testing.T) {
+	os.Clearenv()
+	os.Setenv("APP_INTERVALS", "0.1234,-10.5")
+
+	(&App{
+		Flags: []Flag{
+			&Float64SliceFlag{Name: "intervals", Aliases: []string{"i"}, Value: NewFloat64Slice(), EnvVars: []string{"COMPAT_INTERVALS", "APP_INTERVALS"}},
+		},
+		Action: func(ctx *Context) error {
+			if !reflect.DeepEqual(ctx.Float64Slice("intervals"), []float64{0.1234, -10.5}) {
+				t.Errorf("main name not set from env")
+			}
+			if !reflect.DeepEqual(ctx.Float64Slice("i"), []float64{0.1234, -10.5}) {
+				t.Errorf("short name not set from env")
+			}
+			return nil
+		},
+	}).Run([]string{"run"})
+}
+
+
 func TestParseMultiBool(t *testing.T) {
 	a := App{
 		Flags: []Flag{