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enhancement: Add
--color flag to cerbos compile
By default, the output color level is detected from the environment by checking if stdout is a TTY and looking for various environment variables. See https://pkg.go.dev/github.com/jwalton/go-supportscolor for details. Signed-off-by: Andrew Haines <haines@cerbos.dev>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // Copyright 2021-2022 Zenauth Ltd. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
|
||
| package outputcolor | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "reflect" | ||
|
|
||
| "github.com/alecthomas/kong" | ||
| "github.com/jwalton/go-supportscolor" | ||
| ) | ||
|
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||
| type Level uint8 | ||
|
|
||
| const ( | ||
| None = Level(supportscolor.None) | ||
| Basic = Level(supportscolor.Basic) | ||
| Ansi256 = Level(supportscolor.Ansi256) | ||
| Ansi16m = Level(supportscolor.Ansi16m) | ||
| ) | ||
|
|
||
| var TypeMapper = kong.TypeMapper(reflect.TypeOf((*Level)(nil)), kong.MapperFunc(decode)) | ||
|
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| func (l *Level) Resolve(disable bool) Level { | ||
| if disable { | ||
| return None | ||
| } | ||
|
|
||
| if l != nil { | ||
| return *l | ||
| } | ||
|
|
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| return Level(supportscolor.SupportsColor(os.Stdout.Fd(), supportscolor.SniffFlagsOption(false)).Level) | ||
| } | ||
|
|
||
| func (l Level) Enabled() bool { | ||
| return l > None | ||
| } | ||
|
|
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| func decode(ctx *kong.DecodeContext, target reflect.Value) error { | ||
| level, err := scan(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| target.Set(reflect.ValueOf(level)) | ||
| return nil | ||
| } | ||
|
|
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| func scan(ctx *kong.DecodeContext) (*Level, error) { | ||
| token := ctx.Scan.Peek() | ||
|
|
||
| switch token.Type { | ||
| case kong.FlagValueToken: | ||
| return parse(ctx.Scan.Pop().Value) | ||
|
|
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| case kong.ShortFlagTailToken, kong.UntypedToken: | ||
| level, err := parse(token.Value) | ||
| if err == nil { | ||
| ctx.Scan.Pop() | ||
| return level, nil | ||
| } | ||
| } | ||
|
|
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| return pointer(Basic), nil | ||
| } | ||
|
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| func parse(v interface{}) (*Level, error) { | ||
| s, ok := v.(string) | ||
| if !ok { | ||
| return nil, fmt.Errorf("invalid flag value (expected string, got %T)", v) | ||
| } | ||
|
|
||
| switch s { | ||
| case "auto": | ||
| return nil, nil | ||
|
|
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| case "false", "never": | ||
| return pointer(None), nil | ||
|
|
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| case "true", "always": | ||
| return pointer(Basic), nil | ||
|
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| case "256": | ||
| return pointer(Ansi256), nil | ||
|
|
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| case "16m", "full", "truecolor": | ||
| return pointer(Ansi16m), nil | ||
|
|
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| default: | ||
| return nil, fmt.Errorf("invalid value for output color level: %q", s) | ||
| } | ||
| } | ||
|
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| func pointer(level Level) *Level { | ||
| return &level | ||
| } |
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