Persist theme preference, dynamic auto theme with matugen

scripts/README-dynamic-theme.md

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+# Dynamic Theme Setup
+
+This setup adds wallpaper-aware "Auto" theme support to your Quickshell + Niri environment.
+
+## Prerequisites
+
+Install the required tools:
+
+```bash
+# Required for Material-You palette generation
+cargo install matugen
+
+# Required for JSON processing (usually pre-installed)
+sudo pacman -S jq  # Arch Linux
+# or: sudo apt install jq  # Ubuntu/Debian
+
+# Background setters (choose one)
+sudo pacman -S swaybg  # Simple and reliable
+# or: cargo install swww  # Smoother transitions
+```
+
+## Setup
+
+1. **Initial wallpaper setup:**
+   ```bash
+   # Set your initial wallpaper
+   ./scripts/set-wallpaper.sh /path/to/your/wallpaper.jpg
+   ```
+
+2. **Enable Niri color integration (optional):**
+   Add this line to your `~/.config/niri/config.kdl`:
+   ```kdl
+   !include "generated_colors.kdl"
+   ```
+
+3. **Enable Auto theme:**
+   Open Control Center → Theme Picker → Click the gradient "Auto" button
+
+## Usage
+
+### Change wallpaper and auto-update theme:
+```bash
+./scripts/set-wallpaper.sh /new/wallpaper.jpg
+```
+
+### Manual theme switching:
+- Use the Control Center theme picker
+- Preferences persist across restarts
+- Auto theme requires wallpaper symlink to exist
+
+## How it works
+
+1. **Color extraction:** `Colors.qml` uses Quickshell's ColorQuantizer to extract dominant colors from the wallpaper symlink
+2. **Persistence:** `Prefs.qml` stores your theme choice using PersistentProperties
+3. **Dynamic switching:** `Theme.qml` switches between static themes and wallpaper colors
+4. **Auto-reload:** Quickshell's file watching automatically reloads when the wallpaper symlink changes
+
+## Troubleshooting
+
+### "Dynamic theme requires wallpaper setup!" error
+Run the setup command:
+```bash
+./scripts/set-wallpaper.sh /path/to/your/wallpaper.jpg
+```
+
+### Colors don't update when changing wallpaper
+- Make sure you're using the script, not manually changing files
+- The symlink at `~/quickshell/current_wallpaper` must exist
+
+### Niri colors don't change
+- Ensure `!include "generated_colors.kdl"` is in your config.kdl
+- Check that matugen and jq are installed
+- Look for `~/.config/niri/generated_colors.kdl`

scripts/set-wallpaper.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+img=$1
+
+QS_DIR="$HOME/quickshell"
+mkdir -p "$QS_DIR"
+LINK="$QS_DIR/current_wallpaper"
+ln -sf -- "$img" "$LINK"
+swaybg -m fill -i "$LINK" & disown
+
+json="$(matugen image "$img" --json hex)"
+
+get() { jq -r "$1" <<<"$json"; }
+
+bg=$(get '.colors.dark.background')
+fg=$(get '.colors.dark.on_background')
+primary=$(get '.colors.dark.primary')
+secondary=$(get '.colors.dark.secondary')
+tertiary=$(get '.colors.dark.tertiary')
+tertiary_ctr=$(get '.colors.dark.tertiary_container')
+error=$(get '.colors.dark.error')
+inverse=$(get '.colors.dark.inverse_primary')
+
+bg_b=$(get '.colors.light.background')
+fg_b=$(get '.colors.light.on_background')
+primary_b=$(get '.colors.light.primary')
+secondary_b=$(get '.colors.light.secondary')
+tertiary_b=$(get '.colors.light.tertiary')
+tertiary_ctr_b=$(get '.colors.light.tertiary_container')
+error_b=$(get '.colors.light.error')
+inverse_b=$(get '.colors.light.inverse_primary')
+
+cat >"$QS_DIR/generated_niri_colors.kdl" <<EOF
+// AUTO-GENERATED on $(date)
+layout {
+    border {
+        active-color   "$primary"
+        inactive-color "$secondary"
+    }
+    focus-ring {
+        active-color   "$inverse"
+    }
+    background-color "$bg"
+}
+EOF
+echo "→ Niri colours:   $QS_DIR/generated_niri_colors.kdl"
+
+cat >"$QS_DIR/generated_ghostty_colors.conf" <<EOF
+# AUTO-GENERATED on $(date)
+
+background = $bg
+foreground = $fg
+cursor-color = $inverse
+selection-background = $secondary
+selection-foreground = #ffffff
+
+palette = 0=$bg
+palette = 1=$error
+palette = 2=$tertiary
+palette = 3=$secondary
+palette = 4=$primary
+palette = 5=$tertiary_ctr
+palette = 6=$inverse
+palette = 7=$fg
+palette = 8=$bg_b
+palette = 9=$error_b
+palette = 10=$tertiary_b
+palette = 11=$secondary_b
+palette = 12=$primary_b
+palette = 13=$tertiary_ctr_b
+palette = 14=$inverse_b
+palette = 15=$fg_b
+EOF
+echo "→ Ghostty theme:  $QS_DIR/generated_ghostty_colors.conf"
+echo "   (use in ghostty:  theme = $QS_DIR/generated_ghostty_colors.conf )"
+
+niri msg action do-screen-transition --delay-ms 100