1 files changed, 55 insertions, 0 deletions
diff --git a/bin/udt-accent b/bin/udt-accent
index e88a512..703f483 100755
--- a/bin/udt-accent
+++ b/bin/udt-accent
@@ -12,6 +12,7 @@ running `wal -i`, because `wal -i` rewrites the whole ~/.cache/wal directory
 including the terminal's ANSI colors. See the design spec for why that matters.
 """
 
+import json
 import math
 import os
 import subprocess
@@ -43,6 +44,19 @@ MIN_CHROMA = 10.0
 OUTPUT = Path.home() / ".cache" / "wal" / "udt-accent.rasi"
 BORDER_OUTPUT = Path.home() / ".cache" / "wal" / "udt-border.lua"
 DUNSTRC = Path.home() / ".cache" / "wal" / "dunstrc"
+COLORS_JSON = Path.home() / ".cache" / "wal" / "colors.json"
+
+# Catppuccin Macchiato, in pywal's slot order. Firefox is themed from this
+# via pywalfox, which reads colors.json and nothing else.
+MACCHIATO = {
+    "background": "#24273a", "foreground": "#cad3f5", "cursor": "#f4dbd6",
+    "colors": [
+        "#494d64", "#ed8796", "#a6da95", "#eed49f",
+        "#8aadf4", "#f5bde6", "#8bd5ca", "#b8c0e0",
+        "#5b6078", "#ed8796", "#a6da95", "#eed49f",
+        "#8aadf4", "#f5bde6", "#8bd5ca", "#a5adcb",
+    ],
+}
 
 
 def _to_lab(hexval):
@@ -166,6 +180,46 @@ def write_border(name):
         raise
 
 
+def write_colors_json(name, image):
+    """Rewrite colors.json as Macchiato with the accent in the highlight slots.
+
+    pywalfox reads this file and nothing else, so this is how Firefox tracks the
+    wallpaper. pywal wrote the file moments earlier with wallpaper-derived ANSI
+    colours; this replaces them wholesale, which is the point: the terminal
+    palette stays fixed Macchiato while only the accent moves.
+    """
+    hexval = ACCENTS[name]
+    colors = list(MACCHIATO["colors"])
+    # Slots 4 and 12 are pywalfox's link/highlight colour.
+    colors[4] = colors[12] = hexval
+
+    doc = {
+        "wallpaper": str(image),
+        "alpha": "100",
+        "special": {
+            "background": MACCHIATO["background"],
+            "foreground": MACCHIATO["foreground"],
+            "cursor": hexval,
+        },
+        "colors": {f"color{i}": c for i, c in enumerate(colors)},
+    }
+
+    fd, tmp = tempfile.mkstemp(dir=str(COLORS_JSON.parent), suffix=".tmp")
+    try:
+        with os.fdopen(fd, "w") as handle:
+            json.dump(doc, handle, indent=4)
+            handle.write("\n")
+        os.replace(tmp, COLORS_JSON)
+    except BaseException:
+        if os.path.exists(tmp):
+            os.unlink(tmp)
+        raise
+
+    # Firefox only picks the new colours up when pywalfox pushes them. Never
+    # fatal: pywalfox may not be installed, and the desktop theme is unaffected.
+    subprocess.run(["pywalfox", "update"], capture_output=True, check=False)
+
+
 def write_dunst(name):
     """Substitute the accent into the dunst config pywal just rendered.
 
@@ -209,6 +263,7 @@ def main(image):
     write_accent(name)
     write_border(name)
     write_dunst(name)
+    write_colors_json(name, image)
 
     # Hyprland only rereads its config on request, and may not be running.
     subprocess.run(["hyprctl", "reload"], capture_output=True, check=False)