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count.go (2963B)

      1 package pflag
      2 
      3 import "strconv"
      4 
      5 // -- count Value
      6 type countValue int
      7 
      8 func newCountValue(val int, p *int) *countValue {
      9 	*p = val
     10 	return (*countValue)(p)
     11 }
     12 
     13 func (i *countValue) Set(s string) error {
     14 	// "+1" means that no specific value was passed, so increment
     15 	if s == "+1" {
     16 		*i = countValue(*i + 1)
     17 		return nil
     18 	}
     19 	v, err := strconv.ParseInt(s, 0, 0)
     20 	*i = countValue(v)
     21 	return err
     22 }
     23 
     24 func (i *countValue) Type() string {
     25 	return "count"
     26 }
     27 
     28 func (i *countValue) String() string { return strconv.Itoa(int(*i)) }
     29 
     30 func countConv(sval string) (interface{}, error) {
     31 	i, err := strconv.Atoi(sval)
     32 	if err != nil {
     33 		return nil, err
     34 	}
     35 	return i, nil
     36 }
     37 
     38 // GetCount return the int value of a flag with the given name
     39 func (f *FlagSet) GetCount(name string) (int, error) {
     40 	val, err := f.getFlagType(name, "count", countConv)
     41 	if err != nil {
     42 		return 0, err
     43 	}
     44 	return val.(int), nil
     45 }
     46 
     47 // CountVar defines a count flag with specified name, default value, and usage string.
     48 // The argument p points to an int variable in which to store the value of the flag.
     49 // A count flag will add 1 to its value every time it is found on the command line
     50 func (f *FlagSet) CountVar(p *int, name string, usage string) {
     51 	f.CountVarP(p, name, "", usage)
     52 }
     53 
     54 // CountVarP is like CountVar only take a shorthand for the flag name.
     55 func (f *FlagSet) CountVarP(p *int, name, shorthand string, usage string) {
     56 	flag := f.VarPF(newCountValue(0, p), name, shorthand, usage)
     57 	flag.NoOptDefVal = "+1"
     58 }
     59 
     60 // CountVar like CountVar only the flag is placed on the CommandLine instead of a given flag set
     61 func CountVar(p *int, name string, usage string) {
     62 	CommandLine.CountVar(p, name, usage)
     63 }
     64 
     65 // CountVarP is like CountVar only take a shorthand for the flag name.
     66 func CountVarP(p *int, name, shorthand string, usage string) {
     67 	CommandLine.CountVarP(p, name, shorthand, usage)
     68 }
     69 
     70 // Count defines a count flag with specified name, default value, and usage string.
     71 // The return value is the address of an int variable that stores the value of the flag.
     72 // A count flag will add 1 to its value every time it is found on the command line
     73 func (f *FlagSet) Count(name string, usage string) *int {
     74 	p := new(int)
     75 	f.CountVarP(p, name, "", usage)
     76 	return p
     77 }
     78 
     79 // CountP is like Count only takes a shorthand for the flag name.
     80 func (f *FlagSet) CountP(name, shorthand string, usage string) *int {
     81 	p := new(int)
     82 	f.CountVarP(p, name, shorthand, usage)
     83 	return p
     84 }
     85 
     86 // Count defines a count flag with specified name, default value, and usage string.
     87 // The return value is the address of an int variable that stores the value of the flag.
     88 // A count flag will add 1 to its value evey time it is found on the command line
     89 func Count(name string, usage string) *int {
     90 	return CommandLine.CountP(name, "", usage)
     91 }
     92 
     93 // CountP is like Count only takes a shorthand for the flag name.
     94 func CountP(name, shorthand string, usage string) *int {
     95 	return CommandLine.CountP(name, shorthand, usage)
     96 }