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https://github.com/mum4k/termdash.git
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503c0ada52
Our tcell library incorrectly referenced tcell color values rather than just names. The values aren't part of the public API and did change with the update to v2. This commit switches our tcell library to using the public constants exported by the `tcell` project. Also aligning our color definition of the first 16 colors with `tcell` and Xterm. Adding two additional colors to make this change backward compatible with `termbox-go`.
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cell
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import (
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"fmt"
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)
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// color.go defines constants for cell colors.
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// Color is the color of a cell.
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type Color int
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// String implements fmt.Stringer()
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func (cc Color) String() string {
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if n, ok := colorNames[cc]; ok {
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return n
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}
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return fmt.Sprintf("Color:%d", cc)
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}
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// colorNames maps Color values to human readable names.
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var colorNames = map[Color]string{
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ColorDefault: "ColorDefault",
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ColorBlack: "ColorBlack",
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ColorRed: "ColorRed",
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ColorGreen: "ColorGreen",
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ColorYellow: "ColorYellow",
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ColorBlue: "ColorBlue",
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ColorMagenta: "ColorMagenta",
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ColorCyan: "ColorCyan",
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ColorWhite: "ColorWhite",
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}
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// The supported terminal colors.
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const (
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ColorDefault Color = iota
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// The 16 Xterm colors.
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// See https://jonasjacek.github.io/colors/
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ColorBlack
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ColorMaroon
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ColorGreen
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ColorOlive
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ColorNavy
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ColorPurple
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ColorTeal
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ColorSilver
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ColorGray
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ColorRed
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ColorLime
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ColorYellow
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ColorBlue
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ColorFuchsia
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ColorAqua
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ColorWhite
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)
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// Colors defined for backward compatibility with termbox-go.
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const (
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ColorMagenta Color = ColorPurple
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ColorCyan Color = ColorTeal
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)
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// ColorNumber sets a color using its number.
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// Make sure your terminal is set to a terminalapi.ColorMode that supports the
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// target color. The provided value must be in the range 0-255.
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// Larger or smaller values will be reset to the default color.
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//
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// For reference on these colors see the Xterm number in:
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// https://jonasjacek.github.io/colors/
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func ColorNumber(n int) Color {
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if n < 0 || n > 255 {
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return ColorDefault
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}
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return Color(n + 1) // Colors are off-by-one due to ColorDefault being zero.
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}
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// ColorRGB6 sets a color using the 6x6x6 terminal color.
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// Make sure your terminal is set to the terminalapi.ColorMode256 mode.
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// The provided values (r, g, b) must be in the range 0-5.
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// Larger or smaller values will be reset to the default color.
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//
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// For reference on these colors see:
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// https://superuser.com/questions/783656/whats-the-deal-with-terminal-colors
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func ColorRGB6(r, g, b int) Color {
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for _, c := range []int{r, g, b} {
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if c < 0 || c > 5 {
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return ColorDefault
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}
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}
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// Explanation:
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// https://stackoverflow.com/questions/27159322/rgb-values-of-the-colors-in-the-ansi-extended-colors-index-17-255
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return Color(0x10 + 36*r + 6*g + b + 1) // Colors are off-by-one due to ColorDefault being zero.
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}
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// ColorRGB24 sets a color using the 24 bit web color scheme.
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// Make sure your terminal is set to the terminalapi.ColorMode256 mode.
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// The provided values (r, g, b) must be in the range 0-255.
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// Larger or smaller values will be reset to the default color.
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//
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// For reference on these colors see the RGB column in:
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// https://jonasjacek.github.io/colors/
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func ColorRGB24(r, g, b int) Color {
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for _, c := range []int{r, g, b} {
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if c < 0 || c > 255 {
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return ColorDefault
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}
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}
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return ColorRGB6(r/51, g/51, b/51)
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}
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