github.com/uber/kraken@v0.1.4/utils/flagutil/flagutil.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package flagutil
    15  
    16  import (
    17  	"flag"
    18  	"strconv"
    19  )
    20  
    21  // Ints allows specifying a slice of ints via flags, where multiple flags of the
    22  // same name append to the slice.
    23  type Ints []int
    24  
    25  var _ flag.Value = (*Ints)(nil)
    26  
    27  func (i *Ints) String() string {
    28  	return "list of ints"
    29  }
    30  
    31  // Set appends v to i.
    32  func (i *Ints) Set(v string) error {
    33  	n, err := strconv.Atoi(v)
    34  	if err != nil {
    35  		return err
    36  	}
    37  	*i = append(*i, n)
    38  	return nil
    39  }