Raito Bezarius e1f5a981ef libcmd/repl: rework command handler
It's 2026 and the command handler was entirely manual!

We introduce a basic command handler framework for the REPL that handles
all the previous (implicit) features reasonably well.

This also builds up the infrastructure for nicer features.

Most important feature is that now we can let external plugins adds
commands to the REPL.

There's slight REPL changes:

- errors for debugger commands are more explicit.
- short-hand have a long-hand version.
- help shows command sorted by std::map natural key sorting (based on aliases)
  while keeping the special syntaxes for the REPL language at the top.
- sections were introduced for Flakes commands.
- :st was merged into one command with an optional argument marker.

Change-Id: Ibd24f994491bf5d45d4b218fd84c0944ae5050fd
Signed-off-by: Raito Bezarius <raito@lix.systems>
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Lix

Lix is an implementation of Nix, a powerful package management system for Linux and other Unix systems that makes package management reliable and reproducible.

Read more about us at https://lix.systems.

Installation

On Linux and macOS the easiest way to install Lix is to run the following shell command (as a user other than root):

$ curl -sSf -L https://install.lix.systems/lix | sh -s -- install

For systems that already have a Nix implementation installed, such as NixOS systems, read our install page

Building And Developing

See our Hacking guide in our manual for instruction on how to set up a development environment and build Lix from source.

Additional Resources

License

Lix is released under LGPL-2.1-or-later.

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