Add current_model function to the API

[guillaumeboehm]

I had a little need for something like this in my confs. And I felt like it could be a useful addition so here's a PR.

I'm still testing it a bit so I'll undraft it in a bit and after adding some unit tests.

[cameronr]

@sudo-tee This specific change looks fine to me.

It does make me wonder, tho, if there's a better way to initialize state.current_model. Currently, it's kind of lazily set, usually via topbar:

opencode.nvim/lua/opencode/ui/topbar.lua

Lines 12 to 16 in c3ad995

	local function format_model_info()
	if not state.current_model or state.current_model == '' then
	local info = config_file.get_opencode_config()
	state.current_model = info and info.model
	end

Also possible it gets set by renderer:

opencode.nvim/lua/opencode/ui/renderer.lua

Lines 932 to 935 in c3ad995

	function M._update_stats_from_message(message)
	if not state.current_model and message.info.providerID and message.info.providerID ~= '' then
	state.current_model = message.info.providerID .. '/' .. message.info.modelID
	end

Or it can be specifically selected:

opencode.nvim/lua/opencode/core.lua

Lines 180 to 189 in c3ad995

	function M.configure_provider()
	require('opencode.provider').select(function(selection)
	if not selection then
	if state.windows then
	ui.focus_input()
	end
	return
	end
	local model_str = string.format('%s/%s', selection.provider, selection.model)
	state.current_model = model_str

Would it be better to explicitly initialize so it's always well defined? Or maybe have a way in state to specify a default initializer function on read when a value is nil?

[sudo-tee]

You are right. I've been thinking about that lately since I got annoyed by the fact that after a restart if you had a session with a specific model it defaults back to the default model instead of picking the one from the last message.

The model should probably be set when the config is loaded if the config specifies one. And should also be determined by the last message in an active session. But it's tricky because if a new session is created after, it should be reset to default IMHO.

A default initializer is a good idea, but only triggered once the config is loaded.

I hope it makes sense?

[cameronr]

I'll take a stab at solving this.