Package org.aesh.terminal.tty.utils

Class ColorUtils

java.lang.Object
org.aesh.terminal.tty.utils.ColorUtils
public final class ColorUtils extends Object
Utility methods for color conversion and tmux color detection.
Author:
Ståle W. Pedersen

  • Method Details

    • isDarkColor

      public static boolean isDarkColor(int[] rgb)
      Determine if an RGB color is dark based on perceived luminance.

      Uses ITU-R BT.601 coefficients: 0.299*R + 0.587*G + 0.114*B

      Parameters:
      rgb - the RGB color array [r, g, b] (0-255 each)
      Returns:
      true if the color is dark, false if light

    • palette256ToRGB

      public static int[] palette256ToRGB(int index)
      Convert a 256-color palette index to RGB.
      Parameters:
      index - the palette index (0-255)
      Returns:
      RGB array [r, g, b], or null if index is out of range

    • namedColorToRGB

      public static int[] namedColorToRGB(String name)
      Convert a named color to RGB.
      Parameters:
      name - the color name (e.g., "black", "red", "green")
      Returns:
      RGB array [r, g, b], or null if name is not recognized

    • parseTmuxColor

      public static int[] parseTmuxColor(String color)
      Parse a tmux color value.
      Parameters:
      color - the color string (e.g., "#282828", "colour235", "black")
      Returns:
      RGB array or null

    • parseTmuxStyle

      public static int[][] parseTmuxStyle(String style)
      Parse a tmux style string like "bg=colour235,fg=colour252" or "bg=#282828".
      Parameters:
      style - the tmux style string
      Returns:
      array of two RGB arrays: [foreground, background], either may be null

    • detectColorsFromTmux

      public static int[][] detectColorsFromTmux()
      Try to detect terminal colors by querying tmux options.

      Only works when running inside tmux. Queries the window-active-style option.

      Returns:
      array of two RGB arrays: [foreground, background], either may be null