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amfora/config/theme.go

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package config
import (
"fmt"
"sync"
"github.com/gdamore/tcell/v2"
)
// Functions to allow themeing configuration.
// UI element tcell.Colors are mapped to a string key, such as "error" or "tab_bg"
// These are the same keys used in the config file.
// Special color with no real color value
// Used for a default foreground color
// White is the terminal background is black, black if the terminal background is white
// Converted to a real color in this file before being sent out to other modules
const ColorFg = tcell.ColorSpecial | 2
// The same as ColorFg, but inverted
const ColorBg = tcell.ColorSpecial | 3
var themeMu = sync.RWMutex{}
var theme = map[string]tcell.Color{
// Map these for special uses in code
"ColorBg": ColorBg,
"ColorFg": ColorFg,
// Default values below
// Only the 16 Xterm system tcell.Colors are used, because those are the tcell.Colors overrided
// by the user's default terminal theme
// Used for cview.Styles.PrimitiveBackgroundColor
// Set to tcell.ColorDefault because that allows transparent terminals to work
// The rest of this theme assumes that the background is equivalent to black, but
// white colors switched to black later if the background is determined to be white.
//
// Also, this is set to tcell.ColorBlack in config.go if colors are disabled in the config.
"bg": tcell.ColorDefault,
"tab_num": tcell.ColorTeal,
"tab_divider": ColorFg,
"bottombar_label": tcell.ColorTeal,
"bottombar_text": ColorBg,
"bottombar_bg": ColorFg,
"scrollbar": ColorFg,
// Modals
"btn_bg": tcell.ColorTeal, // All modal buttons
"btn_text": tcell.ColorWhite, // White instead of ColorFg because background is known to be Teal
"dl_choice_modal_bg": tcell.ColorOlive,
"dl_choice_modal_text": tcell.ColorWhite,
"dl_modal_bg": tcell.ColorOlive,
"dl_modal_text": tcell.ColorWhite,
"info_modal_bg": tcell.ColorGray,
"info_modal_text": tcell.ColorWhite,
"error_modal_bg": tcell.ColorMaroon,
"error_modal_text": tcell.ColorWhite,
"yesno_modal_bg": tcell.ColorTeal,
"yesno_modal_text": tcell.ColorWhite,
"tofu_modal_bg": tcell.ColorMaroon,
"tofu_modal_text": tcell.ColorWhite,
"subscription_modal_bg": tcell.ColorTeal,
"subscription_modal_text": tcell.ColorWhite,
"input_modal_bg": tcell.ColorGreen,
"input_modal_text": tcell.ColorWhite,
"input_modal_field_bg": tcell.ColorNavy,
"input_modal_field_text": tcell.ColorWhite,
"bkmk_modal_bg": tcell.ColorTeal,
"bkmk_modal_text": tcell.ColorWhite,
"bkmk_modal_label": tcell.ColorYellow,
"bkmk_modal_field_bg": tcell.ColorNavy,
"bkmk_modal_field_text": tcell.ColorWhite,
"hdg_1": tcell.ColorRed,
"hdg_2": tcell.ColorLime,
"hdg_3": tcell.ColorFuchsia,
"amfora_link": tcell.ColorBlue,
"foreign_link": tcell.ColorPurple,
"link_number": tcell.ColorSilver,
"regular_text": ColorFg,
"quote_text": ColorFg,
"preformatted_text": ColorFg,
"list_text": ColorFg,
}
func SetColor(key string, color tcell.Color) {
themeMu.Lock()
// Use truecolor because this is only called with user-set tcell.Colors
// Which should be represented exactly
theme[key] = color.TrueColor()
themeMu.Unlock()
}
// GetColor will return tcell.ColorBlack if there is no tcell.Color for the provided key.
func GetColor(key string) tcell.Color {
themeMu.RLock()
defer themeMu.RUnlock()
color := theme[key]
if color == ColorFg {
if hasDarkTerminalBackground {
return tcell.ColorWhite
}
return tcell.ColorBlack
}
if color == ColorBg {
if hasDarkTerminalBackground {
return tcell.ColorBlack
}
return tcell.ColorWhite
}
return color
}
// colorToString converts a color to a string for use in a cview tag
func colorToString(color tcell.Color) string {
if color == tcell.ColorDefault {
return "-"
}
if color == ColorFg {
if hasDarkTerminalBackground {
return "white"
}
return "black"
}
if color == ColorBg {
if hasDarkTerminalBackground {
return "black"
}
return "white"
}
if color&tcell.ColorIsRGB == 0 {
// tcell.Color is not RGB/TrueColor, it's a tcell.Color from the default terminal
// theme as set above
// Return a tcell.Color name instead of a hex code, so that cview doesn't use TrueColor
return ColorToColorName[color]
}
// Color set by user, must be respected exactly so hex code is used
return fmt.Sprintf("#%06x", color.Hex())
}
// GetColorString returns a string that can be used in a cview tcell.Color tag,
// for the given theme key.
// It will return "#000000" if there is no tcell.Color for the provided key.
func GetColorString(key string) string {
themeMu.RLock()
defer themeMu.RUnlock()
return colorToString(theme[key])
}
// GetContrastingColor returns tcell.ColorBlack if tcell.Color is brighter than gray
// otherwise returns tcell.ColorWhite if tcell.Color is dimmer than gray
// if tcell.Color is tcell.ColorDefault (undefined luminance) this returns tcell.ColorDefault
func GetContrastingColor(color tcell.Color) tcell.Color {
if color == tcell.ColorDefault {
// tcell.Color should never be tcell.ColorDefault
// only config keys which end in bg are allowed to be set to default
// and the only way the argument of this function is set to tcell.ColorDefault
// is if both the text and bg of an element in the UI are set to default
return tcell.ColorDefault
}
r, g, b := color.RGB()
luminance := (77*r + 150*g + 29*b + 1<<7) >> 8
const gray = 119 // The middle gray
if luminance > gray {
return tcell.ColorBlack
}
return tcell.ColorWhite
}
// GetTextColor is the Same as GetColor, unless the key is "default".
// This happens on focus of a UI element which has a bg of default, in which case
// It return tcell.ColorBlack or tcell.ColorWhite, depending on which is more readable
func GetTextColor(key, bg string) tcell.Color {
themeMu.RLock()
defer themeMu.RUnlock()
color := theme[key].TrueColor()
if color != tcell.ColorDefault {
return color
}
return GetContrastingColor(theme[bg].TrueColor())
}
// GetTextColorString is the Same as GetColorString, unless the key is "default".
// This happens on focus of a UI element which has a bg of default, in which case
// It return tcell.ColorBlack or tcell.ColorWhite, depending on which is more readable
func GetTextColorString(key, bg string) string {
return colorToString(GetTextColor(key, bg))
}
// Inverted version of a tcell map
// https://github.com/gdamore/tcell/blob/v2.3.3/color.go#L845
var ColorToColorName = map[tcell.Color]string{
tcell.ColorBlack: "black",
tcell.ColorMaroon: "maroon",
tcell.ColorGreen: "green",
tcell.ColorOlive: "olive",
tcell.ColorNavy: "navy",
tcell.ColorPurple: "purple",
tcell.ColorTeal: "teal",
tcell.ColorSilver: "silver",
tcell.ColorGray: "gray",
tcell.ColorRed: "red",
tcell.ColorLime: "lime",
tcell.ColorYellow: "yellow",
tcell.ColorBlue: "blue",
tcell.ColorFuchsia: "fuchsia",
tcell.ColorAqua: "aqua",
tcell.ColorWhite: "white",
tcell.ColorAliceBlue: "aliceblue",
tcell.ColorAntiqueWhite: "antiquewhite",
tcell.ColorAquaMarine: "aquamarine",
tcell.ColorAzure: "azure",
tcell.ColorBeige: "beige",
tcell.ColorBisque: "bisque",
tcell.ColorBlanchedAlmond: "blanchedalmond",
tcell.ColorBlueViolet: "blueviolet",
tcell.ColorBrown: "brown",
tcell.ColorBurlyWood: "burlywood",
tcell.ColorCadetBlue: "cadetblue",
tcell.ColorChartreuse: "chartreuse",
tcell.ColorChocolate: "chocolate",
tcell.ColorCoral: "coral",
tcell.ColorCornflowerBlue: "cornflowerblue",
tcell.ColorCornsilk: "cornsilk",
tcell.ColorCrimson: "crimson",
tcell.ColorDarkBlue: "darkblue",
tcell.ColorDarkCyan: "darkcyan",
tcell.ColorDarkGoldenrod: "darkgoldenrod",
tcell.ColorDarkGray: "darkgray",
tcell.ColorDarkGreen: "darkgreen",
tcell.ColorDarkKhaki: "darkkhaki",
tcell.ColorDarkMagenta: "darkmagenta",
tcell.ColorDarkOliveGreen: "darkolivegreen",
tcell.ColorDarkOrange: "darkorange",
tcell.ColorDarkOrchid: "darkorchid",
tcell.ColorDarkRed: "darkred",
tcell.ColorDarkSalmon: "darksalmon",
tcell.ColorDarkSeaGreen: "darkseagreen",
tcell.ColorDarkSlateBlue: "darkslateblue",
tcell.ColorDarkSlateGray: "darkslategray",
tcell.ColorDarkTurquoise: "darkturquoise",
tcell.ColorDarkViolet: "darkviolet",
tcell.ColorDeepPink: "deeppink",
tcell.ColorDeepSkyBlue: "deepskyblue",
tcell.ColorDimGray: "dimgray",
tcell.ColorDodgerBlue: "dodgerblue",
tcell.ColorFireBrick: "firebrick",
tcell.ColorFloralWhite: "floralwhite",
tcell.ColorForestGreen: "forestgreen",
tcell.ColorGainsboro: "gainsboro",
tcell.ColorGhostWhite: "ghostwhite",
tcell.ColorGold: "gold",
tcell.ColorGoldenrod: "goldenrod",
tcell.ColorGreenYellow: "greenyellow",
tcell.ColorHoneydew: "honeydew",
tcell.ColorHotPink: "hotpink",
tcell.ColorIndianRed: "indianred",
tcell.ColorIndigo: "indigo",
tcell.ColorIvory: "ivory",
tcell.ColorKhaki: "khaki",
tcell.ColorLavender: "lavender",
tcell.ColorLavenderBlush: "lavenderblush",
tcell.ColorLawnGreen: "lawngreen",
tcell.ColorLemonChiffon: "lemonchiffon",
tcell.ColorLightBlue: "lightblue",
tcell.ColorLightCoral: "lightcoral",
tcell.ColorLightCyan: "lightcyan",
tcell.ColorLightGoldenrodYellow: "lightgoldenrodyellow",
tcell.ColorLightGray: "lightgray",
tcell.ColorLightGreen: "lightgreen",
tcell.ColorLightPink: "lightpink",
tcell.ColorLightSalmon: "lightsalmon",
tcell.ColorLightSeaGreen: "lightseagreen",
tcell.ColorLightSkyBlue: "lightskyblue",
tcell.ColorLightSlateGray: "lightslategray",
tcell.ColorLightSteelBlue: "lightsteelblue",
tcell.ColorLightYellow: "lightyellow",
tcell.ColorLimeGreen: "limegreen",
tcell.ColorLinen: "linen",
tcell.ColorMediumAquamarine: "mediumaquamarine",
tcell.ColorMediumBlue: "mediumblue",
tcell.ColorMediumOrchid: "mediumorchid",
tcell.ColorMediumPurple: "mediumpurple",
tcell.ColorMediumSeaGreen: "mediumseagreen",
tcell.ColorMediumSlateBlue: "mediumslateblue",
tcell.ColorMediumSpringGreen: "mediumspringgreen",
tcell.ColorMediumTurquoise: "mediumturquoise",
tcell.ColorMediumVioletRed: "mediumvioletred",
tcell.ColorMidnightBlue: "midnightblue",
tcell.ColorMintCream: "mintcream",
tcell.ColorMistyRose: "mistyrose",
tcell.ColorMoccasin: "moccasin",
tcell.ColorNavajoWhite: "navajowhite",
tcell.ColorOldLace: "oldlace",
tcell.ColorOliveDrab: "olivedrab",
tcell.ColorOrange: "orange",
tcell.ColorOrangeRed: "orangered",
tcell.ColorOrchid: "orchid",
tcell.ColorPaleGoldenrod: "palegoldenrod",
tcell.ColorPaleGreen: "palegreen",
tcell.ColorPaleTurquoise: "paleturquoise",
tcell.ColorPaleVioletRed: "palevioletred",
tcell.ColorPapayaWhip: "papayawhip",
tcell.ColorPeachPuff: "peachpuff",
tcell.ColorPeru: "peru",
tcell.ColorPink: "pink",
tcell.ColorPlum: "plum",
tcell.ColorPowderBlue: "powderblue",
tcell.ColorRebeccaPurple: "rebeccapurple",
tcell.ColorRosyBrown: "rosybrown",
tcell.ColorRoyalBlue: "royalblue",
tcell.ColorSaddleBrown: "saddlebrown",
tcell.ColorSalmon: "salmon",
tcell.ColorSandyBrown: "sandybrown",
tcell.ColorSeaGreen: "seagreen",
tcell.ColorSeashell: "seashell",
tcell.ColorSienna: "sienna",
tcell.ColorSkyblue: "skyblue",
tcell.ColorSlateBlue: "slateblue",
tcell.ColorSlateGray: "slategray",
tcell.ColorSnow: "snow",
tcell.ColorSpringGreen: "springgreen",
tcell.ColorSteelBlue: "steelblue",
tcell.ColorTan: "tan",
tcell.ColorThistle: "thistle",
tcell.ColorTomato: "tomato",
tcell.ColorTurquoise: "turquoise",
tcell.ColorViolet: "violet",
tcell.ColorWheat: "wheat",
tcell.ColorWhiteSmoke: "whitesmoke",
tcell.ColorYellowGreen: "yellowgreen",
}
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