Dynamically Toggle Between Colour Schemes in Existing Tabs and Windows Without Recompiling

I've been wondering about how to load the Solarized themes and switch between light and dark with a key stroke toggle.

This should be possible, but will require changing a few things.

You'll have to send a PR to add a hook that gets called right as Termonad is about to launch. Probably around here:

https://github.com/cdepillabout/termonad/blob/db185e34a4b678183d8d1b1ce0be4c8bf3532fc8/src/Termonad/App.hs#L421-L422

In your own config, you'll have to override that hook to define a new key binding for each existing terminal.

Here's an example of defining a key binding (this code defines the Alt-1, Alt-2, etc bindings for switching tabs):

https://github.com/cdepillabout/termonad/blob/db185e34a4b678183d8d1b1ce0be4c8bf3532fc8/src/Termonad/Keys.hs

https://github.com/cdepillabout/termonad/blob/db185e34a4b678183d8d1b1ce0be4c8bf3532fc8/src/Termonad/Term.hs#L345-L346

Your key binding will have to call a function that loops through all the open tabs and sets the colors for the terminal.

Here's where that is currently being done:

https://github.com/cdepillabout/termonad/blob/db185e34a4b678183d8d1b1ce0be4c8bf3532fc8/src/Termonad/Config/Colour.hs#L453-L479

This is only setting colors for a single terminal, so you'll have to change it so it loops through all tabs.

Here's a function that loops through all tabs (although this is changing the font size):

https://github.com/cdepillabout/termonad/blob/db185e34a4b678183d8d1b1ce0be4c8bf3532fc8/src/Termonad/App.hs#L192-L199

Originally posted by @cdepillabout in https://github.com/cdepillabout/termonad/issues/94#issuecomment-450806022

Read the hook in src/Termonad/Types.hs and its launch point in src/Termonad/App.hs first, then inspect key bindings in src/Termonad/Keys.hs and src/Termonad/Term.hs. Compare the single-terminal color update in src/Termonad/Config/Colour.hs with the tab loop in src/Termonad/App.hs; done means a configurable key binding can switch colors across all open tabs and windows without recompiling.