What I would really like to see is more integration between terminal emulator and the shell (and commands you run in it). Currently in Fedora/GNOME the shell prompt is set up to make the terminal notify you (with a native GUI notification) about long running commands completing. That's cool, but we could go so much further.
For one, the shell could let the terminal know the current directory, hostname, username, git branch, current command, last command status, etc. etc.
The terminal then would display that info in its GUI, and perhaps even let you interact with it (imagine a GtkPopover for changing git branches and a Nautilus-like pathbar for the cwd!) We could then shrink back the prompt back to a simple dollar sign.
That would already be infinitely cool, but it gets better.
What if the shell could send its completions to the terminal and the terminal would display them in a native autocomplete widget (like in Builder)?
What if the terminal could track where the output of each command is and allow you to collapse/expand it with a GtkExpander? What if it could visually present each command and its output as this expandable card, along with the time it was issued and the time it took to run (like `time` outputs) and its exist code? And if it failed, paint that card red? And if it segfaulted, add a button to duck duck go the error, run ABRT or even run dnf debuginfo-install and coredumpctl gdb?
What if pagers like `less` could make use of the native scrolling instead of faking it by moving lines? What if `man` rendered the content to HTML (or GTK's native markup format) and presented it as an actual page, sort of like what you get by running `yelp man:foo` but right there in the terminal?
What if `ls` could make use of the native list/table widget and render file icons, just like Nautilus? What if you could expand the folders it outputs right there using mouse and get a tree view?
Don't tell me that fish or vim already display completions in a pop-up using some magical pseudographics. I'm not talking about abusing the old grid-of-characters model of terminals. I'm talking about making the shell and the terminal communicate better so we can use *native* (e.g. GTK+) widgets for what is traditionally done using text-based interfaces.
Mind, just like currently `ls` knows to columnize and colorize its output and `grep` knows to highlight the matches in red *when outputting to a terminal*, but fall back to plain text when piped to something, what I'm describing here would simply fall back to plain text when piped or run in a less magical terminal. So this is about enhancing the existing tools, not about breaking compatibility in any way.
And at the same time that would really get the terminal/shell experience from "emulating ancient hardware to be able to do stuff we haven't yet made a GUI for" to "a way to do advanced stuff with your computer using a command-based interface".
That would truly be a command-based interface for the 21th century. That would be something I'd be proud, not ashamed, to show off to Windows users as the advanced way to tune your system.
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