go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/flag/stringsetflag/stringsetflag_test.go (about)

     1  // Copyright 2016 The LUCI Authors.
     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  
    15  package stringsetflag
    16  
    17  import (
    18  	"flag"
    19  	"fmt"
    20  	"os"
    21  )
    22  
    23  // Example demonstrates how to use stringlistflag.
    24  func Example() {
    25  	sset := Flag{}
    26  
    27  	fs := flag.NewFlagSet("test", flag.ContinueOnError)
    28  	fs.Var(&sset, "color", "favorite color, may be repeated.")
    29  	fs.SetOutput(os.Stdout)
    30  
    31  	fs.PrintDefaults()
    32  
    33  	// Flag parsing.
    34  	fs.Parse([]string{"-color", "Violet", "-color", "Red", "-color", "Violet"})
    35  	fmt.Printf("Value is: %s\n", sset)
    36  
    37  	fmt.Println("Likes Blue:", sset.Data.Has("Blue"))
    38  	fmt.Println("Likes Red:", sset.Data.Has("Red"))
    39  
    40  	// Output:
    41  	// -color value
    42  	//     	favorite color, may be repeated.
    43  	// Value is: Red,Violet
    44  	// Likes Blue: false
    45  	// Likes Red: true
    46  }