chbg：现在用于systemd服务也能正常清理下载下来的临时文件叻

bin/chbg

@@ -132,19 +132,22 @@ done
 
 echo "Selected: $randomimage"
 
-if [ -f "$randomimage" ]; then
-  set_wallpaper "$randomimage"
-  exit 0
-fi
-
-tmpfile=$(mktemp)
-trap 'rm -f "$tmpfile"' EXIT
-if command -v curl >/dev/null 2>&1; then
-  curl -sSL "$randomimage" -o "$tmpfile"
-elif command -v wget >/dev/null 2>&1; then
-  wget -qO "$tmpfile" "$randomimage"
-else
+request_wallpaper() {
+  tmpfile=$(mktemp)
+  trap 'rm -f "$tmpfile"' EXIT
+  if command -v curl >/dev/null 2>&1; then
+    curl -sSL "$1" -o "$tmpfile"
+  elif command -v wget >/dev/null 2>&1; then
+    wget -qO "$tmpfile" "$1"
+  else
     echo "x) Unable to fetch image without 'curl' or 'wget'." >&2
     exit 2
+  fi
+  set_wallpaper "$tmpfile"
+}
+
+if [ -f "$randomimage" ]; then
+  set_wallpaper "$randomimage"
+else
+  request_wallpaper "$randomimage"
 fi
-set_wallpaper "$tmpfile"