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gdash-countdown-clock is a simple Common Lisp + Parenscript web app
presenting a countdown clock for the next meeting scheduled in my
Google calendar. The calendar agenda is polled via Google's API and
published to an ActiveMQ topic. See
https://github.com/atgreen/gdash-gcal-poll for the trivial
implementation. gdash-countdown-clock listens to that topic and
pushes the "Next Meeting" time into the browser via some AJAX magic.
Background colour changes to the webapp at the T-5 and T-2 minute
marks are implemented through CSS content. The colour changes are
what alerts users to upcoming meetings.
I use gdash-countdown-clock as part of a personal grafana dashboard.
It is presented through a grafana HTML text panel with the following
content:
Grafana currently includes a countdown timer vizualization, but the
countdown time is static, and defined in the panel definition itself.
This was not sufficient for my use case -- alerting me to upcoming
meetings.
This project is carrying a local version of cl-stomp, which contains a
feature (heart-beat support) that is now upstream, but not currently
available via quicklisp.