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color_mode.go
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color_mode.go
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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package terminalapi
// color_mode.go defines the terminal color modes.
// ColorMode represents a color mode of a terminal.
type ColorMode int
// String implements fmt.Stringer()
func (cm ColorMode) String() string {
if n, ok := colorModeNames[cm]; ok {
return n
}
return "ColorModeUnknown"
}
// colorModeNames maps ColorMode values to human readable names.
var colorModeNames = map[ColorMode]string{
ColorModeNormal: "ColorModeNormal",
ColorMode256: "ColorMode256",
ColorMode216: "ColorMode216",
ColorModeGrayscale: "ColorModeGrayscale",
}
// Supported color modes.
const (
// ColorModeNormal supports 8 "system" colors.
// These are defined as constants in the cell package.
ColorModeNormal ColorMode = iota
// ColorMode256 enables using any of the 256 terminal colors.
// 0-7: the 8 "system" colors accessible in ColorModeNormal.
// 8-15: the 8 "bright system" colors.
// 16-231: the 216 different terminal colors.
// 232-255: the 24 different shades of grey.
ColorMode256
// ColorMode216 supports only the third range of the ColorMode256, i.e the
// 216 different terminal colors. However in this mode the colors are zero
// based, so the caller doesn't need to provide an offset.
ColorMode216
// ColorModeGrayscale supports only the fourth range of the ColorMode256,
// i.e the 24 different shades of grey. However in this mode the colors are
// zero based, so the caller doesn't need to provide an offset.
ColorModeGrayscale
)