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@@ -0,0 +1,1280 @@
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+// Copyright 2014-2016 The Docker & Go Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style
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+// license that can be found in the LICENSE file.
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+
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+// Package mflag implements command-line flag parsing.
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+//
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+// Usage:
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+//
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+// Define flags using flag.String(), Bool(), Int(), etc.
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+//
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+// This declares an integer flag, -f or --flagname, stored in the pointer ip, with type *int.
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+// import "flag /github.com/docker/libnetwork/client/mflag"
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+// var ip = flag.Int([]string{"f", "-flagname"}, 1234, "help message for flagname")
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+// If you like, you can bind the flag to a variable using the Var() functions.
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+// var flagvar int
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+// func init() {
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+// // -flaghidden will work, but will be hidden from the usage
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+// flag.IntVar(&flagvar, []string{"f", "#flaghidden", "-flagname"}, 1234, "help message for flagname")
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+// }
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+// Or you can create custom flags that satisfy the Value interface (with
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+// pointer receivers) and couple them to flag parsing by
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+// flag.Var(&flagVal, []string{"name"}, "help message for flagname")
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+// For such flags, the default value is just the initial value of the variable.
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+//
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+// You can also add "deprecated" flags, they are still usable, but are not shown
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+// in the usage and will display a warning when you try to use them. `#` before
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+// an option means this option is deprecated, if there is an following option
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+// without `#` ahead, then that's the replacement, if not, it will just be removed:
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+// var ip = flag.Int([]string{"#f", "#flagname", "-flagname"}, 1234, "help message for flagname")
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+// this will display: `Warning: '-f' is deprecated, it will be replaced by '--flagname' soon. See usage.` or
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+// this will display: `Warning: '-flagname' is deprecated, it will be replaced by '--flagname' soon. See usage.`
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+// var ip = flag.Int([]string{"f", "#flagname"}, 1234, "help message for flagname")
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+// will display: `Warning: '-flagname' is deprecated, it will be removed soon. See usage.`
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+// so you can only use `-f`.
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+//
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+// You can also group one letter flags, bif you declare
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+// var v = flag.Bool([]string{"v", "-verbose"}, false, "help message for verbose")
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+// var s = flag.Bool([]string{"s", "-slow"}, false, "help message for slow")
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+// you will be able to use the -vs or -sv
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+//
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+// After all flags are defined, call
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+// flag.Parse()
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+// to parse the command line into the defined flags.
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+//
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+// Flags may then be used directly. If you're using the flags themselves,
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+// they are all pointers; if you bind to variables, they're values.
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+// fmt.Println("ip has value ", *ip)
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+// fmt.Println("flagvar has value ", flagvar)
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+//
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+// After parsing, the arguments after the flag are available as the
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+// slice flag.Args() or individually as flag.Arg(i).
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+// The arguments are indexed from 0 through flag.NArg()-1.
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+//
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+// Command line flag syntax:
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+// -flag
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+// -flag=x
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+// -flag="x"
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+// -flag='x'
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+// -flag x // non-boolean flags only
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+// One or two minus signs may be used; they are equivalent.
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+// The last form is not permitted for boolean flags because the
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+// meaning of the command
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+// cmd -x *
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+// will change if there is a file called 0, false, etc. You must
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+// use the -flag=false form to turn off a boolean flag.
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+//
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+// Flag parsing stops just before the first non-flag argument
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+// ("-" is a non-flag argument) or after the terminator "--".
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+//
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+// Integer flags accept 1234, 0664, 0x1234 and may be negative.
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+// Boolean flags may be 1, 0, t, f, true, false, TRUE, FALSE, True, False.
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+// Duration flags accept any input valid for time.ParseDuration.
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+//
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+// The default set of command-line flags is controlled by
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+// top-level functions. The FlagSet type allows one to define
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+// independent sets of flags, such as to implement subcommands
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+// in a command-line interface. The methods of FlagSet are
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+// analogous to the top-level functions for the command-line
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+// flag set.
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+
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+package mflag
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+
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+import (
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+ "errors"
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+ "fmt"
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+ "io"
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+ "os"
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+ "runtime"
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+ "sort"
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+ "strconv"
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+ "strings"
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+ "text/tabwriter"
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+ "time"
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+
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+ "github.com/docker/docker/pkg/homedir"
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+)
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+
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+// ErrHelp is the error returned if the flag -help is invoked but no such flag is defined.
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+var ErrHelp = errors.New("flag: help requested")
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+
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+// ErrRetry is the error returned if you need to try letter by letter
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+var ErrRetry = errors.New("flag: retry")
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+
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+// -- bool Value
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+type boolValue bool
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+
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+func newBoolValue(val bool, p *bool) *boolValue {
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+ *p = val
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+ return (*boolValue)(p)
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+}
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+
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+func (b *boolValue) Set(s string) error {
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+ v, err := strconv.ParseBool(s)
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+ *b = boolValue(v)
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+ return err
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+}
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+
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+func (b *boolValue) Get() interface{} { return bool(*b) }
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+
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+func (b *boolValue) String() string { return fmt.Sprintf("%v", *b) }
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+
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+func (b *boolValue) IsBoolFlag() bool { return true }
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+
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+// optional interface to indicate boolean flags that can be
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+// supplied without "=value" text
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+type boolFlag interface {
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+ Value
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+ IsBoolFlag() bool
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+}
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+
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+// -- int Value
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+type intValue int
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+
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+func newIntValue(val int, p *int) *intValue {
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+ *p = val
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+ return (*intValue)(p)
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+}
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+
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+func (i *intValue) Set(s string) error {
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+ v, err := strconv.ParseInt(s, 0, 64)
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+ *i = intValue(v)
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+ return err
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+}
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+
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+func (i *intValue) Get() interface{} { return int(*i) }
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+
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+func (i *intValue) String() string { return fmt.Sprintf("%v", *i) }
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+
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+// -- int64 Value
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+type int64Value int64
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+
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+func newInt64Value(val int64, p *int64) *int64Value {
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+ *p = val
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+ return (*int64Value)(p)
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+}
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+
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+func (i *int64Value) Set(s string) error {
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+ v, err := strconv.ParseInt(s, 0, 64)
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+ *i = int64Value(v)
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+ return err
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+}
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+
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+func (i *int64Value) Get() interface{} { return int64(*i) }
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+
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+func (i *int64Value) String() string { return fmt.Sprintf("%v", *i) }
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+
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+// -- uint Value
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+type uintValue uint
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+
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+func newUintValue(val uint, p *uint) *uintValue {
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+ *p = val
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+ return (*uintValue)(p)
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+}
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+
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+func (i *uintValue) Set(s string) error {
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+ v, err := strconv.ParseUint(s, 0, 64)
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+ *i = uintValue(v)
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+ return err
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+}
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+
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+func (i *uintValue) Get() interface{} { return uint(*i) }
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+
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+func (i *uintValue) String() string { return fmt.Sprintf("%v", *i) }
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+
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+// -- uint64 Value
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+type uint64Value uint64
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+
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+func newUint64Value(val uint64, p *uint64) *uint64Value {
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+ *p = val
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+ return (*uint64Value)(p)
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+}
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+
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+func (i *uint64Value) Set(s string) error {
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+ v, err := strconv.ParseUint(s, 0, 64)
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+ *i = uint64Value(v)
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+ return err
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+}
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+
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+func (i *uint64Value) Get() interface{} { return uint64(*i) }
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+
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+func (i *uint64Value) String() string { return fmt.Sprintf("%v", *i) }
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+
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+// -- uint16 Value
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+type uint16Value uint16
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+
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+func newUint16Value(val uint16, p *uint16) *uint16Value {
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+ *p = val
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+ return (*uint16Value)(p)
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+}
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+
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+func (i *uint16Value) Set(s string) error {
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+ v, err := strconv.ParseUint(s, 0, 16)
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+ *i = uint16Value(v)
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+ return err
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+}
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+
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+func (i *uint16Value) Get() interface{} { return uint16(*i) }
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+
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+func (i *uint16Value) String() string { return fmt.Sprintf("%v", *i) }
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+
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+// -- string Value
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+type stringValue string
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+
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+func newStringValue(val string, p *string) *stringValue {
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+ *p = val
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+ return (*stringValue)(p)
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+}
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+
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+func (s *stringValue) Set(val string) error {
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+ *s = stringValue(val)
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+ return nil
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+}
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+
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+func (s *stringValue) Get() interface{} { return string(*s) }
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+
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+func (s *stringValue) String() string { return fmt.Sprintf("%s", *s) }
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+
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+// -- float64 Value
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+type float64Value float64
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+
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+func newFloat64Value(val float64, p *float64) *float64Value {
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+ *p = val
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+ return (*float64Value)(p)
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+}
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+
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+func (f *float64Value) Set(s string) error {
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+ v, err := strconv.ParseFloat(s, 64)
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+ *f = float64Value(v)
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+ return err
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+}
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+
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+func (f *float64Value) Get() interface{} { return float64(*f) }
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+
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+func (f *float64Value) String() string { return fmt.Sprintf("%v", *f) }
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+
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+// -- time.Duration Value
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+type durationValue time.Duration
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+
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+func newDurationValue(val time.Duration, p *time.Duration) *durationValue {
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+ *p = val
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+ return (*durationValue)(p)
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+}
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+
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+func (d *durationValue) Set(s string) error {
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+ v, err := time.ParseDuration(s)
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+ *d = durationValue(v)
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+ return err
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+}
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+
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+func (d *durationValue) Get() interface{} { return time.Duration(*d) }
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+
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+func (d *durationValue) String() string { return (*time.Duration)(d).String() }
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+
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+// Value is the interface to the dynamic value stored in a flag.
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+// (The default value is represented as a string.)
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+//
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+// If a Value has an IsBoolFlag() bool method returning true,
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+// the command-line parser makes -name equivalent to -name=true
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+// rather than using the next command-line argument.
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+type Value interface {
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+ String() string
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+ Set(string) error
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+}
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+
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+// Getter is an interface that allows the contents of a Value to be retrieved.
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+// It wraps the Value interface, rather than being part of it, because it
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+// appeared after Go 1 and its compatibility rules. All Value types provided
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+// by this package satisfy the Getter interface.
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+type Getter interface {
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+ Value
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+ Get() interface{}
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+}
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+
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+// ErrorHandling defines how to handle flag parsing errors.
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+type ErrorHandling int
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+
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+// ErrorHandling strategies available when a flag parsing error occurs
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+const (
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+ ContinueOnError ErrorHandling = iota
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+ ExitOnError
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+ PanicOnError
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+)
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+
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+// A FlagSet represents a set of defined flags. The zero value of a FlagSet
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+// has no name and has ContinueOnError error handling.
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+type FlagSet struct {
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+ // Usage is the function called when an error occurs while parsing flags.
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+ // The field is a function (not a method) that may be changed to point to
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+ // a custom error handler.
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+ Usage func()
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+ ShortUsage func()
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+
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+ name string
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+ parsed bool
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+ actual map[string]*Flag
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+ formal map[string]*Flag
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+ args []string // arguments after flags
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+ errorHandling ErrorHandling
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+ output io.Writer // nil means stderr; use Out() accessor
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+ nArgRequirements []nArgRequirement
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+}
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+
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+// A Flag represents the state of a flag.
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+type Flag struct {
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+ Names []string // name as it appears on command line
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+ Usage string // help message
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+ Value Value // value as set
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+ DefValue string // default value (as text); for usage message
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+}
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+
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+type flagSlice []string
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+
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+func (p flagSlice) Len() int { return len(p) }
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+func (p flagSlice) Less(i, j int) bool {
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+ pi, pj := strings.TrimPrefix(p[i], "-"), strings.TrimPrefix(p[j], "-")
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+ lpi, lpj := strings.ToLower(pi), strings.ToLower(pj)
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+ if lpi != lpj {
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+ return lpi < lpj
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+ }
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+ return pi < pj
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+}
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+func (p flagSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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+
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+// sortFlags returns the flags as a slice in lexicographical sorted order.
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+func sortFlags(flags map[string]*Flag) []*Flag {
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+ var list flagSlice
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+
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+ // The sorted list is based on the first name, when flag map might use the other names.
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+ nameMap := make(map[string]string)
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+
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+ for n, f := range flags {
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+ fName := strings.TrimPrefix(f.Names[0], "#")
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+ nameMap[fName] = n
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+ if len(f.Names) == 1 {
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+ list = append(list, fName)
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+ continue
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+ }
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+
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+ found := false
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+ for _, name := range list {
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+ if name == fName {
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+ found = true
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+ break
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+ }
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+ }
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+ if !found {
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+ list = append(list, fName)
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+ }
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+ }
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+ sort.Sort(list)
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+ result := make([]*Flag, len(list))
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+ for i, name := range list {
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+ result[i] = flags[nameMap[name]]
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+ }
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+ return result
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+}
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+
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+// Name returns the name of the FlagSet.
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+func (fs *FlagSet) Name() string {
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+ return fs.name
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+}
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+
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+// Out returns the destination for usage and error messages.
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+func (fs *FlagSet) Out() io.Writer {
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+ if fs.output == nil {
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+ return os.Stderr
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+ }
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+ return fs.output
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+}
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+
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+// SetOutput sets the destination for usage and error messages.
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+// If output is nil, os.Stderr is used.
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+func (fs *FlagSet) SetOutput(output io.Writer) {
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+ fs.output = output
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+}
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+
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+// VisitAll visits the flags in lexicographical order, calling fn for each.
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+// It visits all flags, even those not set.
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+func (fs *FlagSet) VisitAll(fn func(*Flag)) {
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+ for _, flag := range sortFlags(fs.formal) {
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+ fn(flag)
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+ }
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+}
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+
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+// VisitAll visits the command-line flags in lexicographical order, calling
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+// fn for each. It visits all flags, even those not set.
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+func VisitAll(fn func(*Flag)) {
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+ CommandLine.VisitAll(fn)
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+}
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+
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+// Visit visits the flags in lexicographical order, calling fn for each.
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+// It visits only those flags that have been set.
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+func (fs *FlagSet) Visit(fn func(*Flag)) {
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|
|
+ for _, flag := range sortFlags(fs.actual) {
|
|
|
+ fn(flag)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// Visit visits the command-line flags in lexicographical order, calling fn
|
|
|
+// for each. It visits only those flags that have been set.
|
|
|
+func Visit(fn func(*Flag)) {
|
|
|
+ CommandLine.Visit(fn)
|
|
|
+}
|
|
|
+
|
|
|
+// Lookup returns the Flag structure of the named flag, returning nil if none exists.
|
|
|
+func (fs *FlagSet) Lookup(name string) *Flag {
|
|
|
+ return fs.formal[name]
|
|
|
+}
|
|
|
+
|
|
|
+// IsSet indicates whether the specified flag is set in the given FlagSet
|
|
|
+func (fs *FlagSet) IsSet(name string) bool {
|
|
|
+ return fs.actual[name] != nil
|
|
|
+}
|
|
|
+
|
|
|
+// Lookup returns the Flag structure of the named command-line flag,
|
|
|
+// returning nil if none exists.
|
|
|
+func Lookup(name string) *Flag {
|
|
|
+ return CommandLine.formal[name]
|
|
|
+}
|
|
|
+
|
|
|
+// IsSet indicates whether the specified flag was specified at all on the cmd line.
|
|
|
+func IsSet(name string) bool {
|
|
|
+ return CommandLine.IsSet(name)
|
|
|
+}
|
|
|
+
|
|
|
+type nArgRequirementType int
|
|
|
+
|
|
|
+// Indicator used to pass to BadArgs function
|
|
|
+const (
|
|
|
+ Exact nArgRequirementType = iota
|
|
|
+ Max
|
|
|
+ Min
|
|
|
+)
|
|
|
+
|
|
|
+type nArgRequirement struct {
|
|
|
+ Type nArgRequirementType
|
|
|
+ N int
|
|
|
+}
|
|
|
+
|
|
|
+// Require adds a requirement about the number of arguments for the FlagSet.
|
|
|
+// The first parameter can be Exact, Max, or Min to respectively specify the exact,
|
|
|
+// the maximum, or the minimal number of arguments required.
|
|
|
+// The actual check is done in FlagSet.CheckArgs().
|
|
|
+func (fs *FlagSet) Require(nArgRequirementType nArgRequirementType, nArg int) {
|
|
|
+ fs.nArgRequirements = append(fs.nArgRequirements, nArgRequirement{nArgRequirementType, nArg})
|
|
|
+}
|
|
|
+
|
|
|
+// CheckArgs uses the requirements set by FlagSet.Require() to validate
|
|
|
+// the number of arguments. If the requirements are not met,
|
|
|
+// an error message string is returned.
|
|
|
+func (fs *FlagSet) CheckArgs() (message string) {
|
|
|
+ for _, req := range fs.nArgRequirements {
|
|
|
+ var arguments string
|
|
|
+ if req.N == 1 {
|
|
|
+ arguments = "1 argument"
|
|
|
+ } else {
|
|
|
+ arguments = fmt.Sprintf("%d arguments", req.N)
|
|
|
+ }
|
|
|
+
|
|
|
+ str := func(kind string) string {
|
|
|
+ return fmt.Sprintf("%q requires %s%s", fs.name, kind, arguments)
|
|
|
+ }
|
|
|
+
|
|
|
+ switch req.Type {
|
|
|
+ case Exact:
|
|
|
+ if fs.NArg() != req.N {
|
|
|
+ return str("")
|
|
|
+ }
|
|
|
+ case Max:
|
|
|
+ if fs.NArg() > req.N {
|
|
|
+ return str("a maximum of ")
|
|
|
+ }
|
|
|
+ case Min:
|
|
|
+ if fs.NArg() < req.N {
|
|
|
+ return str("a minimum of ")
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return ""
|
|
|
+}
|
|
|
+
|
|
|
+// Set sets the value of the named flag.
|
|
|
+func (fs *FlagSet) Set(name, value string) error {
|
|
|
+ flag, ok := fs.formal[name]
|
|
|
+ if !ok {
|
|
|
+ return fmt.Errorf("no such flag -%v", name)
|
|
|
+ }
|
|
|
+ if err := flag.Value.Set(value); err != nil {
|
|
|
+ return err
|
|
|
+ }
|
|
|
+ if fs.actual == nil {
|
|
|
+ fs.actual = make(map[string]*Flag)
|
|
|
+ }
|
|
|
+ fs.actual[name] = flag
|
|
|
+ return nil
|
|
|
+}
|
|
|
+
|
|
|
+// Set sets the value of the named command-line flag.
|
|
|
+func Set(name, value string) error {
|
|
|
+ return CommandLine.Set(name, value)
|
|
|
+}
|
|
|
+
|
|
|
+// isZeroValue guesses whether the string represents the zero
|
|
|
+// value for a flag. It is not accurate but in practice works OK.
|
|
|
+func isZeroValue(value string) bool {
|
|
|
+ switch value {
|
|
|
+ case "false":
|
|
|
+ return true
|
|
|
+ case "":
|
|
|
+ return true
|
|
|
+ case "0":
|
|
|
+ return true
|
|
|
+ }
|
|
|
+ return false
|
|
|
+}
|
|
|
+
|
|
|
+// PrintDefaults prints, to standard error unless configured
|
|
|
+// otherwise, the default values of all defined flags in the set.
|
|
|
+func (fs *FlagSet) PrintDefaults() {
|
|
|
+ writer := tabwriter.NewWriter(fs.Out(), 20, 1, 3, ' ', 0)
|
|
|
+ home := homedir.Get()
|
|
|
+
|
|
|
+ // Don't substitute when HOME is /
|
|
|
+ if runtime.GOOS != "windows" && home == "/" {
|
|
|
+ home = ""
|
|
|
+ }
|
|
|
+
|
|
|
+ // Add a blank line between cmd description and list of options
|
|
|
+ if fs.FlagCount() > 0 {
|
|
|
+ fmt.Fprintln(writer, "")
|
|
|
+ }
|
|
|
+
|
|
|
+ fs.VisitAll(func(flag *Flag) {
|
|
|
+ names := []string{}
|
|
|
+ for _, name := range flag.Names {
|
|
|
+ if name[0] != '#' {
|
|
|
+ names = append(names, name)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if len(names) > 0 && len(flag.Usage) > 0 {
|
|
|
+ val := flag.DefValue
|
|
|
+
|
|
|
+ if home != "" && strings.HasPrefix(val, home) {
|
|
|
+ val = homedir.GetShortcutString() + val[len(home):]
|
|
|
+ }
|
|
|
+
|
|
|
+ if isZeroValue(val) {
|
|
|
+ format := " -%s"
|
|
|
+ fmt.Fprintf(writer, format, strings.Join(names, ", -"))
|
|
|
+ } else {
|
|
|
+ format := " -%s=%s"
|
|
|
+ fmt.Fprintf(writer, format, strings.Join(names, ", -"), val)
|
|
|
+ }
|
|
|
+ for _, line := range strings.Split(flag.Usage, "\n") {
|
|
|
+ fmt.Fprintln(writer, "\t", line)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ })
|
|
|
+ writer.Flush()
|
|
|
+}
|
|
|
+
|
|
|
+// PrintDefaults prints to standard error the default values of all defined command-line flags.
|
|
|
+func PrintDefaults() {
|
|
|
+ CommandLine.PrintDefaults()
|
|
|
+}
|
|
|
+
|
|
|
+// defaultUsage is the default function to print a usage message.
|
|
|
+func defaultUsage(fs *FlagSet) {
|
|
|
+ if fs.name == "" {
|
|
|
+ fmt.Fprintf(fs.Out(), "Usage:\n")
|
|
|
+ } else {
|
|
|
+ fmt.Fprintf(fs.Out(), "Usage of %s:\n", fs.name)
|
|
|
+ }
|
|
|
+ fs.PrintDefaults()
|
|
|
+}
|
|
|
+
|
|
|
+// NOTE: Usage is not just defaultUsage(CommandLine)
|
|
|
+// because it serves (via godoc flag Usage) as the example
|
|
|
+// for how to write your own usage function.
|
|
|
+
|
|
|
+// Usage prints to standard error a usage message documenting all defined command-line flags.
|
|
|
+// The function is a variable that may be changed to point to a custom function.
|
|
|
+var Usage = func() {
|
|
|
+ fmt.Fprintf(CommandLine.Out(), "Usage of %s:\n", os.Args[0])
|
|
|
+ PrintDefaults()
|
|
|
+}
|
|
|
+
|
|
|
+// ShortUsage prints to standard error a usage message documenting the standard command layout
|
|
|
+// The function is a variable that may be changed to point to a custom function.
|
|
|
+var ShortUsage = func() {
|
|
|
+ fmt.Fprintf(CommandLine.output, "Usage of %s:\n", os.Args[0])
|
|
|
+}
|
|
|
+
|
|
|
+// FlagCount returns the number of flags that have been defined.
|
|
|
+func (fs *FlagSet) FlagCount() int { return len(sortFlags(fs.formal)) }
|
|
|
+
|
|
|
+// FlagCountUndeprecated returns the number of undeprecated flags that have been defined.
|
|
|
+func (fs *FlagSet) FlagCountUndeprecated() int {
|
|
|
+ count := 0
|
|
|
+ for _, flag := range sortFlags(fs.formal) {
|
|
|
+ for _, name := range flag.Names {
|
|
|
+ if name[0] != '#' {
|
|
|
+ count++
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return count
|
|
|
+}
|
|
|
+
|
|
|
+// NFlag returns the number of flags that have been set.
|
|
|
+func (fs *FlagSet) NFlag() int { return len(fs.actual) }
|
|
|
+
|
|
|
+// NFlag returns the number of command-line flags that have been set.
|
|
|
+func NFlag() int { return len(CommandLine.actual) }
|
|
|
+
|
|
|
+// Arg returns the i'th argument. Arg(0) is the first remaining argument
|
|
|
+// after flags have been processed.
|
|
|
+func (fs *FlagSet) Arg(i int) string {
|
|
|
+ if i < 0 || i >= len(fs.args) {
|
|
|
+ return ""
|
|
|
+ }
|
|
|
+ return fs.args[i]
|
|
|
+}
|
|
|
+
|
|
|
+// Arg returns the i'th command-line argument. Arg(0) is the first remaining argument
|
|
|
+// after flags have been processed.
|
|
|
+func Arg(i int) string {
|
|
|
+ return CommandLine.Arg(i)
|
|
|
+}
|
|
|
+
|
|
|
+// NArg is the number of arguments remaining after flags have been processed.
|
|
|
+func (fs *FlagSet) NArg() int { return len(fs.args) }
|
|
|
+
|
|
|
+// NArg is the number of arguments remaining after flags have been processed.
|
|
|
+func NArg() int { return len(CommandLine.args) }
|
|
|
+
|
|
|
+// Args returns the non-flag arguments.
|
|
|
+func (fs *FlagSet) Args() []string { return fs.args }
|
|
|
+
|
|
|
+// Args returns the non-flag command-line arguments.
|
|
|
+func Args() []string { return CommandLine.args }
|
|
|
+
|
|
|
+// BoolVar defines a bool flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a bool variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) BoolVar(p *bool, names []string, value bool, usage string) {
|
|
|
+ fs.Var(newBoolValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// BoolVar defines a bool flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a bool variable in which to store the value of the flag.
|
|
|
+func BoolVar(p *bool, names []string, value bool, usage string) {
|
|
|
+ CommandLine.Var(newBoolValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Bool defines a bool flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a bool variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Bool(names []string, value bool, usage string) *bool {
|
|
|
+ p := new(bool)
|
|
|
+ fs.BoolVar(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Bool defines a bool flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a bool variable that stores the value of the flag.
|
|
|
+func Bool(names []string, value bool, usage string) *bool {
|
|
|
+ return CommandLine.Bool(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// IntVar defines an int flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to an int variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) IntVar(p *int, names []string, value int, usage string) {
|
|
|
+ fs.Var(newIntValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// IntVar defines an int flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to an int variable in which to store the value of the flag.
|
|
|
+func IntVar(p *int, names []string, value int, usage string) {
|
|
|
+ CommandLine.Var(newIntValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Int defines an int flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of an int variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Int(names []string, value int, usage string) *int {
|
|
|
+ p := new(int)
|
|
|
+ fs.IntVar(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Int defines an int flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of an int variable that stores the value of the flag.
|
|
|
+func Int(names []string, value int, usage string) *int {
|
|
|
+ return CommandLine.Int(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Int64Var defines an int64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to an int64 variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) Int64Var(p *int64, names []string, value int64, usage string) {
|
|
|
+ fs.Var(newInt64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Int64Var defines an int64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to an int64 variable in which to store the value of the flag.
|
|
|
+func Int64Var(p *int64, names []string, value int64, usage string) {
|
|
|
+ CommandLine.Var(newInt64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Int64 defines an int64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of an int64 variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Int64(names []string, value int64, usage string) *int64 {
|
|
|
+ p := new(int64)
|
|
|
+ fs.Int64Var(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Int64 defines an int64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of an int64 variable that stores the value of the flag.
|
|
|
+func Int64(names []string, value int64, usage string) *int64 {
|
|
|
+ return CommandLine.Int64(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// UintVar defines a uint flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) UintVar(p *uint, names []string, value uint, usage string) {
|
|
|
+ fs.Var(newUintValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// UintVar defines a uint flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint variable in which to store the value of the flag.
|
|
|
+func UintVar(p *uint, names []string, value uint, usage string) {
|
|
|
+ CommandLine.Var(newUintValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint defines a uint flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Uint(names []string, value uint, usage string) *uint {
|
|
|
+ p := new(uint)
|
|
|
+ fs.UintVar(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Uint defines a uint flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint variable that stores the value of the flag.
|
|
|
+func Uint(names []string, value uint, usage string) *uint {
|
|
|
+ return CommandLine.Uint(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint64Var defines a uint64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint64 variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) Uint64Var(p *uint64, names []string, value uint64, usage string) {
|
|
|
+ fs.Var(newUint64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint64Var defines a uint64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint64 variable in which to store the value of the flag.
|
|
|
+func Uint64Var(p *uint64, names []string, value uint64, usage string) {
|
|
|
+ CommandLine.Var(newUint64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint64 defines a uint64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint64 variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Uint64(names []string, value uint64, usage string) *uint64 {
|
|
|
+ p := new(uint64)
|
|
|
+ fs.Uint64Var(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Uint64 defines a uint64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint64 variable that stores the value of the flag.
|
|
|
+func Uint64(names []string, value uint64, usage string) *uint64 {
|
|
|
+ return CommandLine.Uint64(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint16Var defines a uint16 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint16 variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) Uint16Var(p *uint16, names []string, value uint16, usage string) {
|
|
|
+ fs.Var(newUint16Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint16Var defines a uint16 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a uint16 variable in which to store the value of the flag.
|
|
|
+func Uint16Var(p *uint16, names []string, value uint16, usage string) {
|
|
|
+ CommandLine.Var(newUint16Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Uint16 defines a uint16 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint16 variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Uint16(names []string, value uint16, usage string) *uint16 {
|
|
|
+ p := new(uint16)
|
|
|
+ fs.Uint16Var(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Uint16 defines a uint16 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a uint16 variable that stores the value of the flag.
|
|
|
+func Uint16(names []string, value uint16, usage string) *uint16 {
|
|
|
+ return CommandLine.Uint16(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// StringVar defines a string flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a string variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) StringVar(p *string, names []string, value string, usage string) {
|
|
|
+ fs.Var(newStringValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// StringVar defines a string flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a string variable in which to store the value of the flag.
|
|
|
+func StringVar(p *string, names []string, value string, usage string) {
|
|
|
+ CommandLine.Var(newStringValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// String defines a string flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a string variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) String(names []string, value string, usage string) *string {
|
|
|
+ p := new(string)
|
|
|
+ fs.StringVar(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// String defines a string flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a string variable that stores the value of the flag.
|
|
|
+func String(names []string, value string, usage string) *string {
|
|
|
+ return CommandLine.String(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Float64Var defines a float64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a float64 variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) Float64Var(p *float64, names []string, value float64, usage string) {
|
|
|
+ fs.Var(newFloat64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Float64Var defines a float64 flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a float64 variable in which to store the value of the flag.
|
|
|
+func Float64Var(p *float64, names []string, value float64, usage string) {
|
|
|
+ CommandLine.Var(newFloat64Value(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Float64 defines a float64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a float64 variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Float64(names []string, value float64, usage string) *float64 {
|
|
|
+ p := new(float64)
|
|
|
+ fs.Float64Var(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Float64 defines a float64 flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a float64 variable that stores the value of the flag.
|
|
|
+func Float64(names []string, value float64, usage string) *float64 {
|
|
|
+ return CommandLine.Float64(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// DurationVar defines a time.Duration flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a time.Duration variable in which to store the value of the flag.
|
|
|
+func (fs *FlagSet) DurationVar(p *time.Duration, names []string, value time.Duration, usage string) {
|
|
|
+ fs.Var(newDurationValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// DurationVar defines a time.Duration flag with specified name, default value, and usage string.
|
|
|
+// The argument p points to a time.Duration variable in which to store the value of the flag.
|
|
|
+func DurationVar(p *time.Duration, names []string, value time.Duration, usage string) {
|
|
|
+ CommandLine.Var(newDurationValue(value, p), names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Duration defines a time.Duration flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a time.Duration variable that stores the value of the flag.
|
|
|
+func (fs *FlagSet) Duration(names []string, value time.Duration, usage string) *time.Duration {
|
|
|
+ p := new(time.Duration)
|
|
|
+ fs.DurationVar(p, names, value, usage)
|
|
|
+ return p
|
|
|
+}
|
|
|
+
|
|
|
+// Duration defines a time.Duration flag with specified name, default value, and usage string.
|
|
|
+// The return value is the address of a time.Duration variable that stores the value of the flag.
|
|
|
+func Duration(names []string, value time.Duration, usage string) *time.Duration {
|
|
|
+ return CommandLine.Duration(names, value, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// Var defines a flag with the specified name and usage string. The type and
|
|
|
+// value of the flag are represented by the first argument, of type Value, which
|
|
|
+// typically holds a user-defined implementation of Value. For instance, the
|
|
|
+// caller could create a flag that turns a comma-separated string into a slice
|
|
|
+// of strings by giving the slice the methods of Value; in particular, Set would
|
|
|
+// decompose the comma-separated string into the slice.
|
|
|
+func (fs *FlagSet) Var(value Value, names []string, usage string) {
|
|
|
+ // Remember the default value as a string; it won't change.
|
|
|
+ flag := &Flag{names, usage, value, value.String()}
|
|
|
+ for _, name := range names {
|
|
|
+ name = strings.TrimPrefix(name, "#")
|
|
|
+ _, alreadythere := fs.formal[name]
|
|
|
+ if alreadythere {
|
|
|
+ var msg string
|
|
|
+ if fs.name == "" {
|
|
|
+ msg = fmt.Sprintf("flag redefined: %s", name)
|
|
|
+ } else {
|
|
|
+ msg = fmt.Sprintf("%s flag redefined: %s", fs.name, name)
|
|
|
+ }
|
|
|
+ fmt.Fprintln(fs.Out(), msg)
|
|
|
+ panic(msg) // Happens only if flags are declared with identical names
|
|
|
+ }
|
|
|
+ if fs.formal == nil {
|
|
|
+ fs.formal = make(map[string]*Flag)
|
|
|
+ }
|
|
|
+ fs.formal[name] = flag
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// Var defines a flag with the specified name and usage string. The type and
|
|
|
+// value of the flag are represented by the first argument, of type Value, which
|
|
|
+// typically holds a user-defined implementation of Value. For instance, the
|
|
|
+// caller could create a flag that turns a comma-separated string into a slice
|
|
|
+// of strings by giving the slice the methods of Value; in particular, Set would
|
|
|
+// decompose the comma-separated string into the slice.
|
|
|
+func Var(value Value, names []string, usage string) {
|
|
|
+ CommandLine.Var(value, names, usage)
|
|
|
+}
|
|
|
+
|
|
|
+// failf prints to standard error a formatted error and usage message and
|
|
|
+// returns the error.
|
|
|
+func (fs *FlagSet) failf(format string, a ...interface{}) error {
|
|
|
+ err := fmt.Errorf(format, a...)
|
|
|
+ fmt.Fprintln(fs.Out(), err)
|
|
|
+ if os.Args[0] == fs.name {
|
|
|
+ fmt.Fprintf(fs.Out(), "See '%s --help'.\n", os.Args[0])
|
|
|
+ } else {
|
|
|
+ fmt.Fprintf(fs.Out(), "See '%s %s --help'.\n", os.Args[0], fs.name)
|
|
|
+ }
|
|
|
+ return err
|
|
|
+}
|
|
|
+
|
|
|
+// usage calls the Usage method for the flag set, or the usage function if
|
|
|
+// the flag set is CommandLine.
|
|
|
+func (fs *FlagSet) usage() {
|
|
|
+ if fs == CommandLine {
|
|
|
+ Usage()
|
|
|
+ } else if fs.Usage == nil {
|
|
|
+ defaultUsage(fs)
|
|
|
+ } else {
|
|
|
+ fs.Usage()
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+func trimQuotes(str string) string {
|
|
|
+ if len(str) == 0 {
|
|
|
+ return str
|
|
|
+ }
|
|
|
+ type quote struct {
|
|
|
+ start, end byte
|
|
|
+ }
|
|
|
+
|
|
|
+ // All valid quote types.
|
|
|
+ quotes := []quote{
|
|
|
+ // Double quotes
|
|
|
+ {
|
|
|
+ start: '"',
|
|
|
+ end: '"',
|
|
|
+ },
|
|
|
+
|
|
|
+ // Single quotes
|
|
|
+ {
|
|
|
+ start: '\'',
|
|
|
+ end: '\'',
|
|
|
+ },
|
|
|
+ }
|
|
|
+
|
|
|
+ for _, quote := range quotes {
|
|
|
+ // Only strip if outermost match.
|
|
|
+ if str[0] == quote.start && str[len(str)-1] == quote.end {
|
|
|
+ str = str[1 : len(str)-1]
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return str
|
|
|
+}
|
|
|
+
|
|
|
+// parseOne parses one flag. It reports whether a flag was seen.
|
|
|
+func (fs *FlagSet) parseOne() (bool, string, error) {
|
|
|
+ if len(fs.args) == 0 {
|
|
|
+ return false, "", nil
|
|
|
+ }
|
|
|
+ s := fs.args[0]
|
|
|
+ if len(s) == 0 || s[0] != '-' || len(s) == 1 {
|
|
|
+ return false, "", nil
|
|
|
+ }
|
|
|
+ if s[1] == '-' && len(s) == 2 { // "--" terminates the flags
|
|
|
+ fs.args = fs.args[1:]
|
|
|
+ return false, "", nil
|
|
|
+ }
|
|
|
+ name := s[1:]
|
|
|
+ if len(name) == 0 || name[0] == '=' {
|
|
|
+ return false, "", fs.failf("bad flag syntax: %s", s)
|
|
|
+ }
|
|
|
+
|
|
|
+ // it's a flag. does it have an argument?
|
|
|
+ fs.args = fs.args[1:]
|
|
|
+ hasValue := false
|
|
|
+ value := ""
|
|
|
+ if i := strings.Index(name, "="); i != -1 {
|
|
|
+ value = trimQuotes(name[i+1:])
|
|
|
+ hasValue = true
|
|
|
+ name = name[:i]
|
|
|
+ }
|
|
|
+
|
|
|
+ m := fs.formal
|
|
|
+ flag, alreadythere := m[name] // BUG
|
|
|
+ if !alreadythere {
|
|
|
+ if name == "-help" || name == "help" || name == "h" { // special case for nice help message.
|
|
|
+ fs.usage()
|
|
|
+ return false, "", ErrHelp
|
|
|
+ }
|
|
|
+ if len(name) > 0 && name[0] == '-' {
|
|
|
+ return false, "", fs.failf("flag provided but not defined: -%s", name)
|
|
|
+ }
|
|
|
+ return false, name, ErrRetry
|
|
|
+ }
|
|
|
+ if fv, ok := flag.Value.(boolFlag); ok && fv.IsBoolFlag() { // special case: doesn't need an arg
|
|
|
+ if hasValue {
|
|
|
+ if err := fv.Set(value); err != nil {
|
|
|
+ return false, "", fs.failf("invalid boolean value %q for -%s: %v", value, name, err)
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ fv.Set("true")
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // It must have a value, which might be the next argument.
|
|
|
+ if !hasValue && len(fs.args) > 0 {
|
|
|
+ // value is the next arg
|
|
|
+ hasValue = true
|
|
|
+ value, fs.args = fs.args[0], fs.args[1:]
|
|
|
+ }
|
|
|
+ if !hasValue {
|
|
|
+ return false, "", fs.failf("flag needs an argument: -%s", name)
|
|
|
+ }
|
|
|
+ if err := flag.Value.Set(value); err != nil {
|
|
|
+ return false, "", fs.failf("invalid value %q for flag -%s: %v", value, name, err)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if fs.actual == nil {
|
|
|
+ fs.actual = make(map[string]*Flag)
|
|
|
+ }
|
|
|
+ fs.actual[name] = flag
|
|
|
+ for i, n := range flag.Names {
|
|
|
+ if n == fmt.Sprintf("#%s", name) {
|
|
|
+ replacement := ""
|
|
|
+ for j := i; j < len(flag.Names); j++ {
|
|
|
+ if flag.Names[j][0] != '#' {
|
|
|
+ replacement = flag.Names[j]
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if replacement != "" {
|
|
|
+ fmt.Fprintf(fs.Out(), "Warning: '-%s' is deprecated, it will be replaced by '-%s' soon. See usage.\n", name, replacement)
|
|
|
+ } else {
|
|
|
+ fmt.Fprintf(fs.Out(), "Warning: '-%s' is deprecated, it will be removed soon. See usage.\n", name)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return true, "", nil
|
|
|
+}
|
|
|
+
|
|
|
+// Parse parses flag definitions from the argument list, which should not
|
|
|
+// include the command name. Must be called after all flags in the FlagSet
|
|
|
+// are defined and before flags are accessed by the program.
|
|
|
+// The return value will be ErrHelp if -help was set but not defined.
|
|
|
+func (fs *FlagSet) Parse(arguments []string) error {
|
|
|
+ fs.parsed = true
|
|
|
+ fs.args = arguments
|
|
|
+ for {
|
|
|
+ seen, name, err := fs.parseOne()
|
|
|
+ if seen {
|
|
|
+ continue
|
|
|
+ }
|
|
|
+ if err == nil {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ if err == ErrRetry {
|
|
|
+ if len(name) > 1 {
|
|
|
+ err = nil
|
|
|
+ for _, letter := range strings.Split(name, "") {
|
|
|
+ fs.args = append([]string{"-" + letter}, fs.args...)
|
|
|
+ seen2, _, err2 := fs.parseOne()
|
|
|
+ if seen2 {
|
|
|
+ continue
|
|
|
+ }
|
|
|
+ if err2 != nil {
|
|
|
+ err = fs.failf("flag provided but not defined: -%s", name)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if err == nil {
|
|
|
+ continue
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ err = fs.failf("flag provided but not defined: -%s", name)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ switch fs.errorHandling {
|
|
|
+ case ContinueOnError:
|
|
|
+ return err
|
|
|
+ case ExitOnError:
|
|
|
+ os.Exit(125)
|
|
|
+ case PanicOnError:
|
|
|
+ panic(err)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return nil
|
|
|
+}
|
|
|
+
|
|
|
+// ParseFlags is a utility function that adds a help flag if withHelp is true,
|
|
|
+// calls fs.Parse(args) and prints a relevant error message if there are
|
|
|
+// incorrect number of arguments. It returns error only if error handling is
|
|
|
+// set to ContinueOnError and parsing fails. If error handling is set to
|
|
|
+// ExitOnError, it's safe to ignore the return value.
|
|
|
+func (fs *FlagSet) ParseFlags(args []string, withHelp bool) error {
|
|
|
+ var help *bool
|
|
|
+ if withHelp {
|
|
|
+ help = fs.Bool([]string{"#help", "-help"}, false, "Print usage")
|
|
|
+ }
|
|
|
+ if err := fs.Parse(args); err != nil {
|
|
|
+ return err
|
|
|
+ }
|
|
|
+ if help != nil && *help {
|
|
|
+ fs.SetOutput(os.Stdout)
|
|
|
+ fs.Usage()
|
|
|
+ os.Exit(0)
|
|
|
+ }
|
|
|
+ if str := fs.CheckArgs(); str != "" {
|
|
|
+ fs.SetOutput(os.Stderr)
|
|
|
+ fs.ReportError(str, withHelp)
|
|
|
+ fs.ShortUsage()
|
|
|
+ os.Exit(1)
|
|
|
+ }
|
|
|
+ return nil
|
|
|
+}
|
|
|
+
|
|
|
+// ReportError is a utility method that prints a user-friendly message
|
|
|
+// containing the error that occurred during parsing and a suggestion to get help
|
|
|
+func (fs *FlagSet) ReportError(str string, withHelp bool) {
|
|
|
+ if withHelp {
|
|
|
+ if os.Args[0] == fs.Name() {
|
|
|
+ str += ".\nSee '" + os.Args[0] + " --help'"
|
|
|
+ } else {
|
|
|
+ str += ".\nSee '" + os.Args[0] + " " + fs.Name() + " --help'"
|
|
|
+ }
|
|
|
+ }
|
|
|
+ fmt.Fprintf(fs.Out(), "%s: %s.\n", os.Args[0], str)
|
|
|
+}
|
|
|
+
|
|
|
+// Parsed reports whether fs.Parse has been called.
|
|
|
+func (fs *FlagSet) Parsed() bool {
|
|
|
+ return fs.parsed
|
|
|
+}
|
|
|
+
|
|
|
+// Parse parses the command-line flags from os.Args[1:]. Must be called
|
|
|
+// after all flags are defined and before flags are accessed by the program.
|
|
|
+func Parse() {
|
|
|
+ // Ignore errors; CommandLine is set for ExitOnError.
|
|
|
+ CommandLine.Parse(os.Args[1:])
|
|
|
+}
|
|
|
+
|
|
|
+// Parsed returns true if the command-line flags have been parsed.
|
|
|
+func Parsed() bool {
|
|
|
+ return CommandLine.Parsed()
|
|
|
+}
|
|
|
+
|
|
|
+// CommandLine is the default set of command-line flags, parsed from os.Args.
|
|
|
+// The top-level functions such as BoolVar, Arg, and on are wrappers for the
|
|
|
+// methods of CommandLine.
|
|
|
+var CommandLine = NewFlagSet(os.Args[0], ExitOnError)
|
|
|
+
|
|
|
+// NewFlagSet returns a new, empty flag set with the specified name and
|
|
|
+// error handling property.
|
|
|
+func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet {
|
|
|
+ f := &FlagSet{
|
|
|
+ name: name,
|
|
|
+ errorHandling: errorHandling,
|
|
|
+ }
|
|
|
+ return f
|
|
|
+}
|
|
|
+
|
|
|
+// Init sets the name and error handling property for a flag set.
|
|
|
+// By default, the zero FlagSet uses an empty name and the
|
|
|
+// ContinueOnError error handling policy.
|
|
|
+func (fs *FlagSet) Init(name string, errorHandling ErrorHandling) {
|
|
|
+ fs.name = name
|
|
|
+ fs.errorHandling = errorHandling
|
|
|
+}
|
|
|
+
|
|
|
+type mergeVal struct {
|
|
|
+ Value
|
|
|
+ key string
|
|
|
+ fset *FlagSet
|
|
|
+}
|
|
|
+
|
|
|
+func (v mergeVal) Set(s string) error {
|
|
|
+ return v.fset.Set(v.key, s)
|
|
|
+}
|
|
|
+
|
|
|
+func (v mergeVal) IsBoolFlag() bool {
|
|
|
+ if b, ok := v.Value.(boolFlag); ok {
|
|
|
+ return b.IsBoolFlag()
|
|
|
+ }
|
|
|
+ return false
|
|
|
+}
|
|
|
+
|
|
|
+// Name returns the name of a mergeVal.
|
|
|
+// If the original value had a name, return the original name,
|
|
|
+// otherwise, return the key asinged to this mergeVal.
|
|
|
+func (v mergeVal) Name() string {
|
|
|
+ type namedValue interface {
|
|
|
+ Name() string
|
|
|
+ }
|
|
|
+ if nVal, ok := v.Value.(namedValue); ok {
|
|
|
+ return nVal.Name()
|
|
|
+ }
|
|
|
+ return v.key
|
|
|
+}
|
|
|
+
|
|
|
+// Merge is an helper function that merges n FlagSets into a single dest FlagSet
|
|
|
+// In case of name collision between the flagsets it will apply
|
|
|
+// the destination FlagSet's errorHandling behavior.
|
|
|
+func Merge(dest *FlagSet, flagsets ...*FlagSet) error {
|
|
|
+ for _, fset := range flagsets {
|
|
|
+ if fset.formal == nil {
|
|
|
+ continue
|
|
|
+ }
|
|
|
+ for k, f := range fset.formal {
|
|
|
+ if _, ok := dest.formal[k]; ok {
|
|
|
+ var err error
|
|
|
+ if fset.name == "" {
|
|
|
+ err = fmt.Errorf("flag redefined: %s", k)
|
|
|
+ } else {
|
|
|
+ err = fmt.Errorf("%s flag redefined: %s", fset.name, k)
|
|
|
+ }
|
|
|
+ fmt.Fprintln(fset.Out(), err.Error())
|
|
|
+ // Happens only if flags are declared with identical names
|
|
|
+ switch dest.errorHandling {
|
|
|
+ case ContinueOnError:
|
|
|
+ return err
|
|
|
+ case ExitOnError:
|
|
|
+ os.Exit(2)
|
|
|
+ case PanicOnError:
|
|
|
+ panic(err)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ newF := *f
|
|
|
+ newF.Value = mergeVal{f.Value, k, fset}
|
|
|
+ if dest.formal == nil {
|
|
|
+ dest.formal = make(map[string]*Flag)
|
|
|
+ }
|
|
|
+ dest.formal[k] = &newF
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return nil
|
|
|
+}
|
|
|
+
|
|
|
+// IsEmpty reports if the FlagSet is actually empty.
|
|
|
+func (fs *FlagSet) IsEmpty() bool {
|
|
|
+ return len(fs.actual) == 0
|
|
|
+}
|
Santhosh Manohar