Add a post on calendar widget

content/posts/calendar_widget_for_sway_and_wayland_alpha/note.md

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+X-Date: 2021-09-20T21:42:33Z
+X-Note-Id: 215c8ea2-68d7-4347-9e47-287b0a2f7f5a
+Subject: Calendar widget for sway/wayland: alpha
+X-Slug: calendar_widget_for_sway_and_wayland_alpha
+
+I've started writing myself a widget to show the next
+meeting I have. When clicked, it should open Zoom or
+whatever video conferencing link is specified in location/description.
+
+It was quite a ride. First, there are no existing solutions for Linux
+that allow you to access calendars from command-line. At least there
+are none that support all existing popular email providers.
+
+When you add an email/calendar account in Gnome, what it does under
+the hood is use Evolution libraries to handle connections and data
+storage. Evolution is very old (started around 2001) and written
+in plain C. All existing libraries for it are written in C as well.
+
+The only thing I've found that I could dismantle and rewrite
+is the gnome-shell applet that shows you the next calendar events.
+Unfortunately again, it's written in C and uses `libecal` to connect
+to Evolution. It's large and complex and will require a lot of work
+to get in shape.
+
+I have the code for my CLI [here on github](https://github.com/knazarov/cal-cli).
+
+It's possible that eventually I'll rewrite it to Vala, because it has
+native support of Gnome libraries and is easier to write in than plain C.