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flags.go
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flags.go
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// Package flags is a wrapper for the default flag package. All types and functions allow checking if a flag was set.
//
// Example:
//
// flags.Bool("local", false, "")
//
// flag.Parse()
//
// flag.Lookup("local").Value.(*flags.IntType).IsSet()
package flags
import (
"errors"
"flag"
"strconv"
"github.com/barchart/common-go/pkg/configuration/database"
)
// Bool defines a bool flag with specified name, default value, and usage string.
func Bool(name string, value bool, usage string) {
v := BoolValue{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Bool defines a database flag with specified name, default value, and usage string.
func Database(name string, value database.Database, usage string) {
v := DatabaseValue{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Float64 defines a float64 flag with specified name, default value, and usage string.
func Float64(name string, value float64, usage string) {
v := Float64Value{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Int defines a int flag with specified name, default value, and usage string.
func Int(name string, value int, usage string) {
v := IntValue{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Int64 defines a int64 flag with specified name, default value, and usage string.
func Int64(name string, value int64, usage string) {
v := Int64Value{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// String defines a string flag with specified name, default value, and usage string.
func String(name string, value string, usage string) {
v := StringValue{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Uint defines a uint flag with specified name, default value, and usage string.
func Uint(name string, value uint, usage string) {
v := UintValue{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// Uint64 defines a uint64 flag with specified name, default value, and usage string.
func Uint64(name string, value uint64, usage string) {
v := Uint64Value{
set: false,
value: value,
}
flag.Var(&v, name, usage)
}
// errParse is returned by Set if a flag's value fails to parse, such as with an invalid integer for Int.
// It then gets wrapped through failf to provide more information.
var errParse = errors.New("parse error")
// errRange is returned by Set if a flag's value is out of range.
// It then gets wrapped through failf to provide more information.
var errRange = errors.New("value out of range")
func numError(err error) error {
ne, ok := err.(*strconv.NumError)
if !ok {
return err
}
if ne.Err == strconv.ErrSyntax {
return errParse
}
if ne.Err == strconv.ErrRange {
return errRange
}
return err
}