nixos config

modules/scripts/cursor-preview-all.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Extracts a small preview PNG (closest to 32px) for every installed
+# cursor theme's "left_ptr" cursor into a cache directory, one per theme
+# named "<theme>.png". Xcursor files are a binary format QML's Image
+# element can't decode directly, so this is a one-time render step —
+# already-cached themes are skipped.
+#
+# usage: cursor-preview-all <cache-dir>
+set -euo pipefail
+
+cache_dir="${1:?usage: cursor-preview-all <cache-dir>}"
+mkdir -p "$cache_dir"
+
+dirs=(
+    "$HOME/.icons"
+    "$HOME/.local/share/icons"
+    "/run/current-system/sw/share/icons"
+    "/etc/profiles/per-user/$USER/share/icons"
+)
+
+render_one() {
+    local theme="$1"
+    local src="$2"
+    local out="$cache_dir/$theme.png"
+    [ -e "$out" ] && return 0
+
+    local tmp
+    tmp=$(mktemp -d)
+    trap 'rm -rf "$tmp"' RETURN
+
+    xcur2png -q -d "$tmp" -c "$tmp/conf" -i 1 "$src" > /dev/null 2>&1 || return 0
+
+    local best=""
+    local best_diff=999999
+    for png in "$tmp"/*.png; do
+        [ -e "$png" ] || continue
+        local w
+        w=$(identify -format "%w" "$png" 2>/dev/null || echo 0)
+        local diff=$(( w > 32 ? w - 32 : 32 - w ))
+        if [ "$diff" -lt "$best_diff" ]; then
+            best_diff=$diff
+            best="$png"
+        fi
+    done
+    [ -n "$best" ] && cp "$best" "$out"
+}
+
+for d in "${dirs[@]}"; do
+    [ -d "$d" ] || continue
+    for theme_dir in "$d"/*/; do
+        [ -f "${theme_dir}cursors/left_ptr" ] || continue
+        render_one "$(basename "$theme_dir")" "${theme_dir}cursors/left_ptr"
+    done
+done