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// Copyright 2019 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package flag
import (
"flag"
"strconv"
"strings"
"go.chromium.org/luci/common/errors"
)
// boolSliceFlag is a flag.Getter implementation representing an []bool.
type boolSliceFlag []bool
// String returns a comma-separated string representation of the flag values.
func (f boolSliceFlag) String() string {
s := make([]string, len(f))
for n, i := range f {
s[n] = strconv.FormatBool(i)
}
return strings.Join(s, ", ")
}
// Set records seeing a flag value.
func (f *boolSliceFlag) Set(val string) error {
b, err := strconv.ParseBool(val)
if err != nil {
return errors.Reason("values must be booleans").Err()
}
*f = append(*f, b)
return nil
}
// Get retrieves the flag value.
func (f boolSliceFlag) Get() interface{} {
return []bool(f)
}
// BoolSlice returns a flag.Getter which reads flags into the given []bool pointer.
func BoolSlice(b *[]bool) flag.Getter {
return (*boolSliceFlag)(b)
}