DIY Make deuteranopia diffs red and blue instead of yellow and blue ​

This is one of our practical examples to override the semantic colors of the Modus themes (Stylistic variants using palette overrides). In this section we show how to implement a red+blue color coding for diffs in the themes modus-operandi-deuteranopia and modus-vivendi-deuteranopia. As those themes are optimized for users with red-green color deficiency, they do not use the typical red+green color coding for diffs, defaulting instead to yellow+blue which are discernible. Users with deuteranomaly or, generally, those who like a different aesthetic, can use the following to make diffs use the red+yellow+blue color coding for removed, changed, and added lines respectively. This is achieved by overriding the “changed” and “removed” entries to use the colors of regular modus-operandi and modus-vivendi.

emacs-lisp
(setq modus-operandi-deuteranopia-palette-overrides
      '((bg-changed         "#ffdfa9")
        (bg-changed-faint   "#ffefbf")
        (bg-changed-refine  "#fac090")
        (bg-changed-fringe  "#d7c20a")
        (fg-changed         "#553d00")
        (fg-changed-intense "#655000")

        (bg-removed         "#ffd8d5")
        (bg-removed-faint   "#ffe9e9")
        (bg-removed-refine  "#f3b5af")
        (bg-removed-fringe  "#d84a4f")
        (fg-removed         "#8f1313")
        (fg-removed-intense "#aa2222")))

(setq modus-vivendi-deuteranopia-palette-overrides
      '((bg-changed         "#363300")
        (bg-changed-faint   "#2a1f00")
        (bg-changed-refine  "#4a4a00")
        (bg-changed-fringe  "#8a7a00")
        (fg-changed         "#efef80")
        (fg-changed-intense "#c0b05f")

        (bg-removed         "#4f1119")
        (bg-removed-faint   "#380a0f")
        (bg-removed-refine  "#781a1f")
        (bg-removed-fringe  "#b81a1f")
        (fg-removed         "#ffbfbf")
        (fg-removed-intense "#ff9095")))

Reload the theme for changes to take effect.