[FEATURE] Preserve Dynamic Content After "Hot-Reload"

[hwangthienhoang]

Description of the requested feature

Issue:

Currently, whenever Eww resources (e.g., yuck, scss, etc.) are updated, the windows reload, and all dynamic content rendered previously is lost.

Example:

When toggling dark mode (which updates scss), my list of notifications is cleared. These notifications are rendered using a deflisten variable. While switching to defpoll could bypass this issue, it’s not an ideal solution due to potential performance and design concerns.

Suggested Solutions:

Introduce :initial with CLI/Method Support:
Allow :initial attributes to access the results of CLI methods or other attributes dynamically.

I'm seeking a clean and efficient approach to handle this scenario and would appreciate any solutions or improvements.

Proposed configuration syntax

No response

Additional context

;; (deflisten notifications :other_initial "cat /.cache/notifications.json" "/.config/eww/scripts/notictl.sh listen -total")
(defpoll notifications :initial '{"count": 0, "notifications": [], "popups": []}' :interval "1s" "cat ~/.cache/notifications.json")``