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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| package prompt | ||
|
|
||
| import ( | ||
| "context" | ||
| "flag" | ||
| "fmt" | ||
|
|
||
| "github.com/gobwas/flagutil/parse" | ||
| "github.com/gobwas/prompt" | ||
| ) | ||
|
|
||
| type FlagInfo struct { | ||
| Message string | ||
| Options []string | ||
| Multiple bool | ||
| Boolean bool | ||
| } | ||
|
|
||
| type FlagInfoMapper interface { | ||
| FlagInfo(context.Context, *flag.Flag) (FlagInfo, error) | ||
| } | ||
|
|
||
| type FlagInfoFunc func(context.Context, *flag.Flag) (FlagInfo, error) | ||
|
|
||
| func (fn FlagInfoFunc) FlagInfo(ctx context.Context, f *flag.Flag) (FlagInfo, error) { | ||
| return fn(ctx, f) | ||
| } | ||
|
|
||
| type FlagInfoMap map[string]FlagInfo | ||
|
|
||
| func (m FlagInfoMap) FlagInfo(_ context.Context, f *flag.Flag) (FlagInfo, error) { | ||
| return m[f.Name], nil | ||
| } | ||
|
|
||
| var DefaultMessage = func(f *flag.Flag, c FlagInfo) string { | ||
| m := "Specify " + f.Name + " value" | ||
| if c.Multiple { | ||
| m += "(s)" | ||
| } | ||
| m += " (" + f.Usage + ")" | ||
| return m | ||
| } | ||
|
|
||
| type Parser struct { | ||
| Retry bool | ||
| FlagInfo FlagInfoMapper | ||
| Message func(*flag.Flag, FlagInfo) string | ||
| } | ||
|
|
||
| func (p *Parser) Parse(ctx context.Context, fs parse.FlagSet) (err error) { | ||
| fs.VisitUnspecified(func(f *flag.Flag) { | ||
| if err != nil { | ||
| return | ||
| } | ||
| repeat: | ||
| var set []string | ||
| set, err = p.values(ctx, f) | ||
| if err != nil { | ||
| return | ||
| } | ||
| for i, s := range set { | ||
| err = fs.Set(f.Name, s) | ||
| if err != nil && p.Retry && i == 0 { | ||
| // i == 0 is required to not leave partially configured flags. | ||
| fmt.Println(err) | ||
| goto repeat | ||
| } | ||
| if err != nil { | ||
| break | ||
| } | ||
| } | ||
| }) | ||
| return err | ||
| } | ||
|
|
||
| func (p *Parser) values(ctx context.Context, f *flag.Flag) ([]string, error) { | ||
| cfg, err := p.info(ctx, f) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| switch { | ||
| case cfg.Options != nil: | ||
| return p.opt(ctx, f, cfg) | ||
|
|
||
| case cfg.Boolean || isBoolFlag(f): | ||
| return p.confirm(ctx, f, cfg) | ||
|
|
||
| default: | ||
| return p.readLine(ctx, f, cfg) | ||
| } | ||
| } | ||
|
|
||
| func (p *Parser) info(ctx context.Context, f *flag.Flag) (_ FlagInfo, err error) { | ||
| if x := p.FlagInfo; x != nil { | ||
| return x.FlagInfo(ctx, f) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (p *Parser) message(f *flag.Flag, c FlagInfo) string { | ||
| if msg := c.Message; msg != "" { | ||
| return msg | ||
| } | ||
| if fn := p.Message; fn != nil { | ||
| return fn(f, c) | ||
| } | ||
| return DefaultMessage(f, c) | ||
| } | ||
|
|
||
| func (p *Parser) opt(ctx context.Context, f *flag.Flag, c FlagInfo) (set []string, err error) { | ||
| s := prompt.Select{ | ||
| Message: p.message(f, c), | ||
| Options: c.Options, | ||
| } | ||
| var xs []int | ||
| if c.Multiple { | ||
| xs, err = s.Multiple(ctx) | ||
| } else { | ||
| xs = []int{-1} | ||
| xs[0], err = s.Single(ctx) | ||
| } | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| set = make([]string, len(xs)) | ||
| for i, x := range xs { | ||
| set[i] = c.Options[x] | ||
| } | ||
| return set, nil | ||
| } | ||
|
|
||
| func (p *Parser) confirm(ctx context.Context, f *flag.Flag, c FlagInfo) (set []string, err error) { | ||
| q := prompt.Question{ | ||
| Message: p.message(f, c), | ||
| Strict: true, | ||
| Mode: prompt.QuestionSuffix, | ||
| } | ||
| v, err := q.Confirm(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return []string{fmt.Sprintf("%t", v)}, nil | ||
| } | ||
|
|
||
| func (p *Parser) readLine(ctx context.Context, f *flag.Flag, c FlagInfo) (set []string, err error) { | ||
| pt := prompt.Prompt{ | ||
| Message: p.message(f, c) + " ", | ||
| Default: f.Value.String(), | ||
| } | ||
| line, err := pt.ReadLine(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return []string{line}, nil | ||
| } | ||
|
|
||
| func isBoolFlag(f *flag.Flag) bool { | ||
| x, ok := f.Value.(interface { | ||
| IsBoolFlag() bool | ||
| }) | ||
| return ok && x.IsBoolFlag() | ||
| } |