options

package
v12.112.1 Latest Latest
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 Go to latest Published: Mar 29, 2024 License: Apache-2.0 Imports: 5 Imported by: 23

Documentation

Overview

Package options provides methods for working with command-line options

Index

Examples

Constants

View Source 
const (
	STRING uint8 = iota // String option
	INT                 // Int/Uint option
	BOOL                // Boolean option
	FLOAT               // Floating number option
	MIXED               // String or boolean option
)

Options types

View Source 
const (
	ERROR_UNSUPPORTED = iota
	ERROR_DUPLICATE_LONGNAME
	ERROR_DUPLICATE_SHORTNAME
	ERROR_OPTION_IS_NIL
	ERROR_EMPTY_VALUE
	ERROR_REQUIRED_NOT_SET
	ERROR_WRONG_FORMAT
	ERROR_CONFLICT
	ERROR_BOUND_NOT_SET
	ERROR_UNSUPPORTED_VALUE
)

Error codes

Variables

View Source 
var (
	// ErrNilOptions returns if options struct is nil
	ErrNilOptions = fmt.Errorf("Options struct is nil")

	// ErrNilMap returns if options map is nil
	ErrNilMap = fmt.Errorf("Options map is nil")

	// ErrEmptyName returns if option have no name
	ErrEmptyName = fmt.Errorf("One or more options do not have a name")
)
View Source 
var MergeSymbol = " "

MergeSymbol used for joining several mergeble options with string value

Functions

func Add 

func Add(name string, opt *V) error

Add adds new supported option

Example 
// Add options
Add("u:user", &V{Type: STRING, Value: "john"})
Add("l:lines", &V{Type: INT, Min: 1, Max: 100})

args, _ := Parse()

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Lines: %d\n", GetI("l:lines"))

Output:

func AddMap 

func AddMap(optMap Map) []error

AddMap adds map with supported options

Example 
// Add options
AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

args, _ := Parse()

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Lines: %d\n", GetI("l:lines"))

Output:

func F added in v12.108.0 

func F(opt string) string

F formats option name (shortcut for Format)

func Format added in v12.94.0 

func Format(opt string) string

Format formats option name

Example 
o := "t:test"

fmt.Printf("Option: %s\n", Format(o))

Output:

Option: -t/--test

func GetB 

func GetB(name string) bool

GetB returns option value as boolean

Example 
args, _ := Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Force: %t\n", GetB("f:force"))

Output:

func GetF 

func GetF(name string) float64

GetF returns option value as floating number

Example 
args, _ := Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"r:ratio": {Type: FLOAT},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Ratio: %g\n", GetF("r:ratio"))

Output:

func GetI 

func GetI(name string) int

GetI returns option value as integer

Example 
args, _ := Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Lines: %d\n", GetI("l:lines"))

Output:

func GetS 

func GetS(name string) string

GetS returns option value as string

Example 
args, _ := Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", GetS("u:user"))
fmt.Printf("Lines: %d\n", GetI("l:lines"))

Output:

func Has 

func Has(name string) bool

Has checks if option with given name exists and set

Example 
args, _ := Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Has user option: %t\n", Has("u:user"))
fmt.Printf("Has lines option: %t\n", Has("l:lines"))

Output:

func Is added in v12.47.0 

func Is(name string, value any) bool

Is checks if option with given name has given value

Example 
Parse(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

if Is("u:user", "bob") && Is("lines", 10) {
	fmt.Println("User is bob and lines number is 10")
}

Output:

func Merge added in v12.94.0 

func Merge(opts ...string) string

Merge merges several options into string

func ParseOptionName 

func ParseOptionName(opt string) (string, string)

ParseOptionName parses combined name and returns long and short options

func Q 

func Q(opts ...string) string

Q merges several options into string (shortcut for Merge)

func Split added in v12.77.0 

func Split(name string) []string

Split splits mergeble option to it's values

Example 
// Use null-terminated string instead of default whitespace for merge.
// Note that the merge symbol must be set before the parsing options.
MergeSymbol = "\x00"

args, _ := Parse(Map{
	"u:user":  {Mergeble: true},
	"r:ratio": {Type: FLOAT},
})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Users: %s\n", Split("u:user"))
fmt.Printf("Ratio: %g\n", GetF("r:ratio"))

Output:

Types

type Argument added in v12.45.0 

type Argument string

Argument is command argument

func (Argument) Base added in v12.45.0 

func (a Argument) Base() Argument

Base is shorthand analog of path.Base

Example 
opts := NewOptions()

input := "run /srv/app//conf/myapp.conf"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Clean: %s\n", args.Get(1).Clean())
fmt.Printf("Base: %s\n", args.Get(1).Base())
fmt.Printf("Dir: %s\n", args.Get(1).Dir())
fmt.Printf("Ext: %s\n", args.Get(1).Ext())
fmt.Printf("IsAbs: %t\n", args.Get(1).IsAbs())

Output:

Arguments: [run /srv/app//conf/myapp.conf]
Clean: /srv/app/conf/myapp.conf
Base: myapp.conf
Dir: /srv/app/conf
Ext: .conf
IsAbs: true

func (Argument) Bool added in v12.45.0 

func (a Argument) Bool() (bool, error)

Int converts argument to int

Example 
opts := NewOptions()

input := "release yes"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
force, _ := args.Get(1).Bool()
fmt.Printf("Force: %t\n", force)

Output:

Arguments: [release yes]
Force: true

func (Argument) Clean added in v12.45.0 

func (a Argument) Clean() Argument

Clean is shorthand analog of path.Clean

Example 
opts := NewOptions()

input := "run /srv/app//conf/myapp.conf"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Clean: %s\n", args.Get(1).Clean())
fmt.Printf("Base: %s\n", args.Get(1).Base())
fmt.Printf("Dir: %s\n", args.Get(1).Dir())
fmt.Printf("Ext: %s\n", args.Get(1).Ext())
fmt.Printf("IsAbs: %t\n", args.Get(1).IsAbs())

Output:

Arguments: [run /srv/app//conf/myapp.conf]
Clean: /srv/app/conf/myapp.conf
Base: myapp.conf
Dir: /srv/app/conf
Ext: .conf
IsAbs: true

func (Argument) Dir added in v12.45.0 

func (a Argument) Dir() Argument

Dir is shorthand analog of path.Dir

Example 
opts := NewOptions()

input := "run /srv/app//conf/myapp.conf"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Clean: %s\n", args.Get(1).Clean())
fmt.Printf("Base: %s\n", args.Get(1).Base())
fmt.Printf("Dir: %s\n", args.Get(1).Dir())
fmt.Printf("Ext: %s\n", args.Get(1).Ext())
fmt.Printf("IsAbs: %t\n", args.Get(1).IsAbs())

Output:

Arguments: [run /srv/app//conf/myapp.conf]
Clean: /srv/app/conf/myapp.conf
Base: myapp.conf
Dir: /srv/app/conf
Ext: .conf
IsAbs: true

func (Argument) Ext added in v12.45.0 

func (a Argument) Ext() Argument

Ext is shorthand analog of path.Ext

Example 
opts := NewOptions()

input := "run /srv/app//conf/myapp.conf"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Clean: %s\n", args.Get(1).Clean())
fmt.Printf("Base: %s\n", args.Get(1).Base())
fmt.Printf("Dir: %s\n", args.Get(1).Dir())
fmt.Printf("Ext: %s\n", args.Get(1).Ext())
fmt.Printf("IsAbs: %t\n", args.Get(1).IsAbs())

Output:

Arguments: [run /srv/app//conf/myapp.conf]
Clean: /srv/app/conf/myapp.conf
Base: myapp.conf
Dir: /srv/app/conf
Ext: .conf
IsAbs: true

func (Argument) Float added in v12.45.0 

func (a Argument) Float() (float64, error)

Int converts argument to int

Example 
opts := NewOptions()

input := "ratio 2.37"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
lines, _ := args.Get(1).Float()
fmt.Printf("Ratio: %g\n", lines)

Output:

Arguments: [ratio 2.37]
Ratio: 2.37

func (Argument) Int added in v12.45.0 

func (a Argument) Int() (int, error)

Int converts argument to int

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
lines, _ := args.Get(2).Int()
fmt.Printf("Lines: %d\n", lines)

Output:

Arguments: [head file.txt 10]
Lines: 10

func (Argument) Int64 added in v12.45.0 

func (a Argument) Int64() (int64, error)

Int64 converts argument to int64

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
lines, _ := args.Get(2).Int64()
fmt.Printf("Lines: %d\n", lines)

Output:

Arguments: [head file.txt 10]
Lines: 10

func (Argument) Is added in v12.49.0 

func (a Argument) Is(value any) bool

Is returns true if argument equals to given value

Example 
opts := NewOptions()

input := "parse fileA.txt fileB.jpg fileC.txt"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Command is \"parse\": %t\n", args.Get(0).Is("parse"))
fmt.Printf("Command is \"clear\": %t\n", args.Get(0).Is("clear"))

Output:

Arguments: [parse fileA.txt fileB.jpg fileC.txt]
Command is "parse": true
Command is "clear": false

func (Argument) IsAbs added in v12.45.0 

func (a Argument) IsAbs() bool

IsAbs is shorthand analog of path.IsAbs

Example 
opts := NewOptions()

input := "run /srv/app//conf/myapp.conf"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Clean: %s\n", args.Get(1).Clean())
fmt.Printf("Base: %s\n", args.Get(1).Base())
fmt.Printf("Dir: %s\n", args.Get(1).Dir())
fmt.Printf("Ext: %s\n", args.Get(1).Ext())
fmt.Printf("IsAbs: %t\n", args.Get(1).IsAbs())

Output:

Arguments: [run /srv/app//conf/myapp.conf]
Clean: /srv/app/conf/myapp.conf
Base: myapp.conf
Dir: /srv/app/conf
Ext: .conf
IsAbs: true

func (Argument) Match added in v12.45.0 

func (a Argument) Match(pattern string) (bool, error)

Match is shorthand analog of path.Match

Example 
opts := NewOptions()

input := "parse fileA.txt fileB.jpg"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
m1, _ := args.Get(1).Match("*.txt")
m2, _ := args.Get(2).Match("*.txt")
fmt.Printf("%s is match: %t\n", args.Get(1), m1)
fmt.Printf("%s is match: %t\n", args.Get(2), m2)

Output:

Arguments: [parse fileA.txt fileB.jpg]
fileA.txt is match: true
fileB.jpg is match: false

func (Argument) String added in v12.45.0 

func (a Argument) String() string

String converts argument to string

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Command: %s\n", args.Get(0).String())

Output:

Arguments: [head file.txt 10]
Command: head

func (Argument) ToLower added in v12.45.0 

func (a Argument) ToLower() Argument

ToLower returns argument converted to lower case

Example 
opts := NewOptions()

input := "add-user John"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", args.Get(1).ToLower().String())

Output:

Arguments: [add-user John]
User: john

func (Argument) ToUpper added in v12.45.0 

func (a Argument) ToUpper() Argument

ToUpper returns argument converted to upper case

Example 
opts := NewOptions()

input := "add-user John"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", args.Get(1).ToUpper().String())

Output:

Arguments: [add-user John]
User: JOHN

func (Argument) Uint added in v12.45.0 

func (a Argument) Uint() (uint64, error)

Uint converts argument to uint

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
lines, _ := args.Get(2).Uint()
fmt.Printf("Lines: %d\n", lines)

Output:

Arguments: [head file.txt 10]
Lines: 10

type Arguments 

type Arguments []Argument

Arguments is a slice with with command argument

func NewArguments added in v12.45.0 

func NewArguments(args ...string) Arguments

NewArguments creates new arguments slice from given strings

Example 
args := NewArguments("head", "file.txt", "10")

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Command: %s\n", args.Get(0).String())
fmt.Printf("File: %s\n", args.Get(1).String())

lines, _ := args.Get(2).Int()
fmt.Printf("Lines: %d\n", lines)

Output:

Arguments: [head file.txt 10]
Command: head
File: file.txt
Lines: 10

func Parse 

func Parse(optMap ...Map) (Arguments, []error)

Parse parses slice with raw options

Example 
// Key is option in format "short-name:long-name" or "long-name"
// We highly recommend defining options names as constants
optMap := Map{
	"s:string":   {},                                     // By default, argument has string type
	"S:string2":  {Type: STRING, Value: "Default value"}, // You can predefine default values
	"int":        {Type: INT},                            // Integer without short name
	"I:int2":     {Type: INT, Min: 1, Max: 10},           // Integer with limits
	"f:float":    {Type: FLOAT, Value: 10.0},             // Float
	"b:boolean":  {Type: BOOL},                           // Boolean
	"r:required": {Type: INT, Required: true},            // Some options can be marked as required
	"m:merg":     {Type: STRING, Mergeble: true},         // Mergeble options can be defined more than one time
	"h:help":     {Type: BOOL, Alias: "u:usage about"},   // You can define argument aliases
	"e:example":  {Conflicts: "s:string S:string2"},      // Option conflicts with string and string2 (options can't be set at same time)
	"E:example2": {Bound: "int I:int2"},                  // Option bound with int and int2 (options must be set at same time)
}

// args is a slice with command arguments
args, errs := Parse(optMap)

if len(errs) != 0 {
	for _, err := range errs {
		fmt.Printf("Error: %v\n", err)
		os.Exit(1)
	}
}

if Has("s:string") {
	fmt.Println("\"--string/-s\" is set")
} else {
	fmt.Println("\"--string/-s\" is not set")
}

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("First argument: %s\n\n", args.Get(0).String())

fmt.Printf("string → %s\n", GetS("string"))
fmt.Printf("int → %d\n", GetI("int"))
fmt.Printf("float → %f\n", GetF("f:float"))
fmt.Printf("boolean → %t\n", GetB("b:boolean"))

Output:

func (Arguments) Append added in v12.45.0 

func (a Arguments) Append(args ...string) Arguments

Append adds arguments to the end of the arguments slices

Example 
opts := NewOptions()

input := "head file.txt"
args, _ := opts.Parse(strings.Split(input, " "))

args = args.Append("10")

fmt.Printf("Arguments: %v\n", args.Strings())

Output:

Arguments: [head file.txt 10]

func (Arguments) Filter added in v12.45.0 

func (a Arguments) Filter(pattern string) Arguments

Filter filters arguments by a given glob pattern. This method works only with files. It means that for a given path only the last part will be checked for pattern matching.

Example 
opts := NewOptions()

input := "parse fileA.txt fileB.jpg fileC.txt"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Text files: %s\n", args[1:].Filter("*.txt"))

Output:

Arguments: [parse fileA.txt fileB.jpg fileC.txt]
Text files: [fileA.txt fileC.txt]

func (Arguments) Flatten added in v12.66.0 

func (a Arguments) Flatten() string

Flatten converts arguments to the string (useful for custom parsing logic)

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args.Flatten())

Output:

Arguments: head file.txt 10

func (Arguments) Get 

func (a Arguments) Get(index int) Argument

Get returns argument with given index

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Command: %s\n", args.Get(0).String())
fmt.Printf("File: %s\n", args.Get(1).String())

lines, _ := args.Get(2).Int()
fmt.Printf("Lines: %d\n", lines)

Output:

Arguments: [head file.txt 10]
Command: head
File: file.txt
Lines: 10

func (Arguments) Has 

func (a Arguments) Has(index int) bool

Has returns true if arguments contains argument with given index

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Has command: %t\n", args.Has(0))

Output:

Arguments: [head file.txt 10]
Has command: true

func (Arguments) Last added in v12.45.0 

func (a Arguments) Last() Argument

Get returns the last argument

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Last argument: %s\n", args.Last())

Output:

Arguments: [head file.txt 10]
Last argument: 10

func (Arguments) Strings added in v12.45.0 

func (a Arguments) Strings() []string

Strings converts arguments to slice with strings

Example 
opts := NewOptions()

input := "head file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args.Strings())

Output:

Arguments: [head file.txt 10]

func (Arguments) Unshift added in v12.45.0 

func (a Arguments) Unshift(args ...string) Arguments

Unshift adds arguments to the beginning of the arguments slices

Example 
opts := NewOptions()

input := "file.txt 10"
args, _ := opts.Parse(strings.Split(input, " "))

args = args.Unshift("head")

fmt.Printf("Arguments: %v\n", args.Strings())

Output:

Arguments: [head file.txt 10]

type Map 

type Map map[string]*V

Map is map with list of options

func (Map) Delete added in v12.108.0 

func (m Map) Delete(name string) bool

Delete removes option from map

Example 
optName := "t:test"

m := Map{
	optName: &V{Value: "abcd"},
}

if m.Delete(optName) {
	fmt.Printf("Option %s deleted\n", F(optName))
} else {
	fmt.Printf("There is no option %s\n", F(optName))
}

Output:

Option -t/--test deleted

func (Map) Set added in v12.108.0 

func (m Map) Set(name string, opt *V) error

Set set option in map Note that if the option is already set, it will be replaced

Example 
m := Map{}

err := m.Set("t:test", &V{Value: "abcd"})

if err != nil {
	panic(err.Error())
}

Output:

func (Map) String added in v12.111.0 

func (m Map) String() string

String returns string representation of options map

Example 
m := Map{
	"s:size": &V{
		Type:      INT,
		Value:     25,
		Alias:     "items",
		Conflicts: "E:empty",
		Bound:     "c:create",
		Min:       10,
		Max:       1000,
	},
}

fmt.Println(m.String())

Output:

options.Map[size:Int{Value:25 Min:10 Max:1000 Alias:items Conflicts:E:empty Bound:c:create}]

type OptionError 

type OptionError struct {
	Option      string
	BoundOption string
	Type        int
}

OptionError is argument parsing error

func (OptionError) Error 

func (e OptionError) Error() string

type Options 

type Options struct {
	// contains filtered or unexported fields
}

Options is options struct

func NewOptions 

func NewOptions() *Options

NewOptions creates new options struct

Example 
opts := NewOptions()

// Add options
opts.Add("u:user", &V{Type: STRING, Value: "john"})
opts.Add("l:lines", &V{Type: INT, Min: 1, Max: 100})

// args contains unparsed values
input := "-u bob -l 12 file.txt"
args, errs := opts.Parse(strings.Split(input, " "))

if len(errs) != 0 {
	for _, err := range errs {
		fmt.Printf("Error: %v\n", err)
		os.Exit(1)
	}
}

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) Add 

func (opts *Options) Add(name string, option *V) error

Add adds a new option

Example 
opts := NewOptions()

// Add options
opts.Add("u:user", &V{Type: STRING, Value: "john"})
opts.Add("l:lines", &V{Type: INT, Min: 1, Max: 100})

args, _ := opts.Parse([]string{"-u", "bob", "-l", "12", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) AddMap 

func (opts *Options) AddMap(optMap Map) []error

AddMap adds map with supported options

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

args, _ := opts.Parse([]string{"-u", "bob", "-l", "12", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) GetB 

func (opts *Options) GetB(name string) bool

GetB returns option value as boolean

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"f:force": {Type: BOOL},
})

args, _ := opts.Parse([]string{"-u", "bob", "-f", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Force: %t\n", opts.GetB("f:force"))

Output:

Arguments: [file.txt]
User: bob
Force: true

func (*Options) GetF 

func (opts *Options) GetF(name string) float64

GetF returns option value as floating number

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"r:ratio": {Type: FLOAT},
})

args, _ := opts.Parse([]string{"-u", "bob", "-r", "2.35", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Ratio: %g\n", opts.GetF("r:ratio"))

Output:

Arguments: [file.txt]
User: bob
Ratio: 2.35

func (*Options) GetI 

func (opts *Options) GetI(name string) int

GetI returns option value as integer

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

args, _ := opts.Parse([]string{"-u", "bob", "-l", "12", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) GetS 

func (opts *Options) GetS(name string) string

GetS returns option value as string

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

args, _ := opts.Parse([]string{"-u", "bob", "-l", "12", "file.txt"})

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) Has 

func (opts *Options) Has(name string) bool

Has checks if option with given name exists and set

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Type: STRING, Value: "john"},
	"l:lines": {Type: INT, Min: 1, Max: 100},
})

input := "-u bob file.txt"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Has user option: %t\n", opts.Has("u:user"))
fmt.Printf("Has lines option: %t\n", opts.Has("l:lines"))

Output:

Arguments: [file.txt]
Has user option: true
Has lines option: false

func (*Options) Is added in v12.47.0 

func (opts *Options) Is(name string, value any) bool

Is checks if option with given name has given value

func (*Options) Parse 

func (opts *Options) Parse(rawOpts []string, optMap ...Map) (Arguments, []error)

Parse parses slice with raw options

Example 
opts := NewOptions()

input := "-u bob -l 12 file.txt"
args, _ := opts.Parse(
	strings.Split(input, " "),
	Map{
		"u:user":  {Type: STRING, Value: "john"},
		"l:lines": {Type: INT, Min: 1, Max: 100},
	},
)

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("User: %s\n", opts.GetS("u:user"))
fmt.Printf("Lines: %d\n", opts.GetI("l:lines"))

Output:

Arguments: [file.txt]
User: bob
Lines: 12

func (*Options) Split added in v12.77.0 

func (opts *Options) Split(name string) []string

Split splits mergeble option to it's values

Example 
opts := NewOptions()

// Add options
opts.AddMap(Map{
	"u:user":  {Mergeble: true},
	"r:ratio": {Type: FLOAT},
})

// Use null-terminated string instead of default whitespace for merge.
// Note that the merge symbol must be set before the parsing options.
MergeSymbol = "\x00"

input := "-u bob -u john -u dave -r 3.14 file.txt"
args, _ := opts.Parse(strings.Split(input, " "))

fmt.Printf("Arguments: %v\n", args)
fmt.Printf("Users: %s\n", opts.Split("u:user"))
fmt.Printf("Ratio: %g\n", opts.GetF("r:ratio"))

Output:

Arguments: [file.txt]
Users: [bob john dave]
Ratio: 3.14

type V 

type V struct {
	Type      uint8   // option type
	Max       float64 // maximum integer option value
	Min       float64 // minimum integer option value
	Alias     string  // list of aliases
	Conflicts string  // list of conflicts options
	Bound     string  // list of bound options
	Mergeble  bool    // option supports options value merging
	Required  bool    // option is required

	Value any // default value
	// contains filtered or unexported fields
}

V is basic option struct

func (*V) String added in v12.111.0 

func (v *V) String() string

String returns string representation of option

Example 
v := &V{
	Type:      INT,
	Value:     25,
	Alias:     "items",
	Conflicts: "E:empty",
	Bound:     "c:create",
	Min:       10,
	Max:       1000,
}

fmt.Println(v.String())

Output:

Int{Value:25 Min:10 Max:1000 Alias:items Conflicts:E:empty Bound:c:create}

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