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136 lines
2.4 KiB
136 lines
2.4 KiB
package arg
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"strings"
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"gitoa.ru/go-4devs/config"
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"gitoa.ru/go-4devs/config/value"
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)
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const Name = "arg"
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var _ config.Provider = (*Provider)(nil)
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type Option func(*Provider)
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func WithKeyFactory(factory func(s ...string) string) Option {
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return func(p *Provider) { p.key = factory }
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}
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func New(opts ...Option) *Provider {
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prov := Provider{
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key: func(s ...string) string {
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return strings.Join(s, "-")
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},
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args: make(map[string][]string, len(os.Args[1:])),
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name: Name,
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}
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for _, opt := range opts {
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opt(&prov)
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}
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return &prov
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}
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type Provider struct {
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args map[string][]string
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key func(...string) string
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name string
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}
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// nolint: cyclop
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// return name, value, error.
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func (p *Provider) parseOne(arg string) (string, string, error) {
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if arg[0] != '-' {
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return "", "", nil
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}
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numMinuses := 1
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if arg[1] == '-' {
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numMinuses++
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}
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name := strings.TrimSpace(arg[numMinuses:])
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if len(name) == 0 {
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return name, "", nil
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}
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if name[0] == '-' || name[0] == '=' {
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return "", "", fmt.Errorf("%w: bad flag syntax: %s", config.ErrInvalidValue, arg)
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}
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var val string
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for idx := 1; idx < len(name); idx++ {
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if name[idx] == '=' || name[idx] == ' ' {
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val = strings.TrimSpace(name[idx+1:])
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name = name[0:idx]
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break
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}
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}
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if val == "" && numMinuses == 1 && len(arg) > 2 {
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name, val = name[:1], name[1:]
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}
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return name, val, nil
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}
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func (p *Provider) parse() error {
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if len(p.args) > 0 {
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return nil
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}
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for _, arg := range os.Args[1:] {
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name, value, err := p.parseOne(arg)
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if err != nil {
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return err
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}
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if name != "" {
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p.args[name] = append(p.args[name], value)
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}
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}
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return nil
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}
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func (p *Provider) Name() string {
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return p.name
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}
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func (p *Provider) Value(_ context.Context, path ...string) (config.Value, error) {
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if err := p.parse(); err != nil {
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return nil, err
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}
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name := p.key(path...)
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if val, ok := p.args[name]; ok {
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switch {
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case len(val) == 1:
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return value.JString(val[0]), nil
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default:
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data, jerr := json.Marshal(val)
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if jerr != nil {
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return nil, fmt.Errorf("failed load data:%w", jerr)
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}
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return value.Decode(func(v interface{}) error {
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if err := json.Unmarshal(data, v); err != nil {
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return fmt.Errorf("unmarshal:%w", err)
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}
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return nil
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}), nil
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}
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}
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return nil, fmt.Errorf("%s:%w", p.Name(), config.ErrValueNotFound)
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}
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