Shortcuts you invent, rules you write, gestures you own - all still just data

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/hypr/looks.lua

@@ -37,6 +37,53 @@ local accentPair = accents[prefs.get("accentName", "blue")] or accents.blue
 local accentStart = accentScheme == "light" and accentPair.light or accentPair.dark
 local accentEnd = accentScheme == "light" and accentPair.lightSecondary or accentPair.darkSecondary
 
+-- ── Color filters ───────────────────────────────────────────────────────────
+--
+-- Grayscale and three color-blindness corrections, as end-of-pipe screen
+-- shaders. Hyprland composites the desktop and then runs one fragment shader
+-- over the result, so a filter here covers every window, the shell, the cursor
+-- and video alike -- which is the only way a filter is honest.
+--
+-- The PREFERENCE is the enum, not the path. That split is deliberate: storing
+-- the path would put a filesystem location a person can edit into the value
+-- that becomes `decoration:screen_shader`, and it would make the stored value
+-- disagree with what hyprctl reports back (which is the path), failing the
+-- schema shape and write-sweep contracts. So PreferenceSchema's colorFilter
+-- entry carries no `hypr:` block, and the enum→path mapping is written twice
+-- on purpose: here, for reloads and for the moment before the shell starts,
+-- and in services/SystemSettings.qml's applyColorFilter for the live apply.
+-- The two lists have to be edited together.
+--
+-- "none" and anything unrecognised both produce the empty string, which is
+-- what Hyprland reads as "no shader" -- and is the value it needs to be given
+-- to turn one OFF, since there is no way to unset the option.
+local shaderDir = (function()
+    local configHome = os.getenv("XDG_CONFIG_HOME")
+    if configHome == nil or configHome == "" then
+        local home = os.getenv("HOME")
+        if home == nil or home == "" then
+            return nil
+        end
+        configHome = home .. "/.config"
+    end
+    return configHome .. "/hypr/shaders"
+end)()
+
+local colorFilters = {
+    grayscale    = "grayscale.frag",
+    protanopia   = "protanopia.frag",
+    deuteranopia = "deuteranopia.frag",
+    tritanopia   = "tritanopia.frag",
+}
+
+local colorFilterShader = ""
+do
+    local file = colorFilters[prefs.get("colorFilter", "none")]
+    if file ~= nil and shaderDir ~= nil then
+        colorFilterShader = shaderDir .. "/" .. file
+    end
+end
+
 hl.config({
     general = {
         gaps_in  = prefs.get("gapsIn", 5),
@@ -145,6 +192,11 @@ hl.config({
 
         -- Off: costs real frame time and reads as smeary on a 60Hz panel.
         motion_blur = { enabled = false },
+
+        -- The accessibility color filter, resolved above. Empty when off, and
+        -- empty costs nothing: Hyprland skips the pass entirely rather than
+        -- running an identity shader.
+        screen_shader = colorFilterShader,
     },
 
     animations = { enabled = prefs.get("animationsEnabled", true) },