Colors layer

• Colorize all identifiers (Christmas tree mode :-)) with mostly unique colors, and the ability to choose saturation and lightness with rainbow-identifiers.
• Colorize only identifiers recognized as variables with color-identifiers.
• Colorize strings representing colors with the color they represent as background with rainbow-mode.
• Display a Nyan cat progress bar in the mode-line with nyan-mode.

To colorize variable identifiers using color-identifiers and its supported languages, set the layer variable colors-colorize-identifiers to variables.

If you want to colorize all identifiers using the more universal rainbow-identifiers method instead, set the layer variable colors-colorize-identifiers to all.

(setq-default dotspacemacs-configuration-layers '(
  (colors :variables colors-colorize-identifiers 'all)))

When using the value all (rainbow-identifiers method), the Saturation and Lightness used for colors can be set on a per-theme basis by adding an entry to the variable colors-theme-identifiers-sat&light. This is an alist where the key is a theme symbol and the value is a pair (saturation lightness).

For now, saturation and lightness are not supported via a variables value! Instead, you must push themes into the alist in your dotspacemacs/user-config section, and then refresh the values to ensure your overrides are applied to your current theme.

Two handy built-in functions makes both of those steps very easy.

Example:

(defun dotspacemacs/user-config ()
  ;; add per-theme sat&light overrides and refresh values for your current theme
  (colors/add-theme-sat&light 'mytheme '(50 50))
  (colors/add-theme-sat&light 'anothertheme '(90 40))
  (colors/refresh-theme-look)
  )

For all themes that lack per-theme overrides, it uses default saturation and lightness. You can configure your own defaults via colors-default-rainbow-identifiers-sat and colors-default-rainbow-identifiers-light, which can be set via variables.

(setq-default dotspacemacs-configuration-layers '(
  (colors :variables
    colors-colorize-identifiers 'all
    colors-default-rainbow-identifiers-sat 42
    colors-default-rainbow-identifiers-light 86)
  )

To enable the package nyan-mode just set the variable colors-enable-nyan-cat-progress-bar to t:

(setq-default dotspacemacs-configuration-layers '(
  (colors :variables colors-enable-nyan-cat-progress-bar t)))

It may be handy to enable it only when Emacs is running in a GUI. You can do that by using a quasi-quoted list which checks the Emacs mode:

(setq-default dotspacemacs-configuration-layers '(
  (colors :variables
          colors-enable-nyan-cat-progress-bar (display-graphic-p))))

The saturation and lightness of rainbow-identifier mode's colors can be adjusted live via the following transient-state:

rainbow-mode mode is different from both rainbow-identifiers and color-identifiers. It can be used together with either (or none) of the identifier colorizers.

All detected color codes in the current buffer will be highlighted as their actual color. However, for accurate display, this mode requires that you use GUI Emacs and that you haven't disabled sRGB mode (if your platform uses that).

To enable, you must manually toggle it on and off on a per-buffer basis with: SPC t C c

nyan-mode mode can be toggled on and off with: SPC t m n

Note that the toggle is local to the current buffer.