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.

(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.