Added shortcut to copy formatted notification text via xclip

[Jaywalker]

Provides the copy shortcut, which sends the notification text formatted as specified by clipboard_format to the program specified in xclip.

Example of added config:

[global]
        clipboard_format = "%s - %b"
        xclip = /usr/bin/xclip -selection clipboard

[shortcuts]
        copy = ctrl+c

[copy-format-override]
        appname = Mumble
        clipboard_format = "%b"

[tsipinakis]

I'm hesitant to merge this as-is as it's clearly designed to satisfy a single use-case, and introduces two three new setting knobs in the process in an already complicated configuration file.

I'd much rather this be transformed into something like what's described in #669. Specifically, create a way to define custom actions for notifications that call a script when activated. With that, this usecase can be satisfied by using a script that calls xclip while additionally allowing many more similar hacks with notifications.

Now, that's obviously a much bigger chunk of work but it's the Right Thing To Do™ if we want to avoid future configuration restructures and compatibility breakages.
Would you be willing to work on something like that to get it merged?

[infokiller]

@tsipinakis I'm curious why you think your suggestion is much more work. My thinking is that work required is adding configuration syntax to add custom actions, which basically call a script with the notification data (for example first arg is title, second arg is content, etc).
Am I missing something? Thanks!

[tsipinakis]

No, that's pretty much it, but it's harder as you have to introduce some new concepts in the configuration and notification code, i.e. a list of all actions that can be run, a way to tell client actions and dunst actions apart etc.

If you're thinking of working on it don't be discouraged though, it's definitely doable and you can feel free to ping me if you need help.

[infokiller]

Gotcha, thanks for the explanation. I'll see if I can carve out some time to work on this.