github.com/marksheahan/packer@v0.10.2-0.20160613200515-1acb2d6645a0/helper/flag-kv/flag.go (about)

     1  package kvflag
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  )
     7  
     8  // Flag is a flag.Value implementation for parsing user variables
     9  // from the command-line in the format of '-var key=value'.
    10  type Flag map[string]string
    11  
    12  func (v *Flag) String() string {
    13  	return ""
    14  }
    15  
    16  func (v *Flag) Set(raw string) error {
    17  	idx := strings.Index(raw, "=")
    18  	if idx == -1 {
    19  		return fmt.Errorf("No '=' value in arg: %s", raw)
    20  	}
    21  
    22  	if *v == nil {
    23  		*v = make(map[string]string)
    24  	}
    25  
    26  	key, value := raw[0:idx], raw[idx+1:]
    27  	(*v)[key] = value
    28  	return nil
    29  }