nix-dotfiles/home-manager/nvim/dotnet.lua

local dotnet_has_set_status_line

function DetachSolution()
	vim.g.current_sln_path = nil
	-- TODO: unregister key bindings again
end

local function on_line(data, _, context)
	-- Keep the window alive if there were warnings
	if string.match(data, "%s[1-9]%d* Warning%(s%)") then
		context.warn = context.warn + 1
	end
end
local function on_complete(context, code, _)
	if code ~= 0 then
		print("Exit code " .. code)
		context.errs = context.errs + 1
	end

	if context.errs == 0 and context.warn == 0 then
		-- Close the temporary floating window (but keep it alive if the
		-- cursor is in it)
		local cur_win = vim.api.nvim_get_current_win()
		local cur_buf = vim.api.nvim_win_get_buf(cur_win)
		if cur_buf ~= context.buffer then
			vim.api.nvim_win_close(context.window, true)
		end
		print("All builds successful")
	end
end

function GetCurrentSln()
	if vim.g.current_sln_path then
		return vim.g.current_sln_path
	else
		return nil
	end
end

function BuildDotNetSolution()
	if vim.g.current_sln_path then
		local context = BuildUtils.create_window()
		context.errs = 0
		context.warn = 0
		BuildUtils.run("dotnet", { "build", vim.g.current_sln_path }, "dotnet build", context, on_line, on_complete)
	end
end

function TestDotNetSolution()
	if vim.g.current_sln_path then
		local context = BuildUtils.create_window()
		context.warn = 0
		context.errs = 0
		BuildUtils.run("dotnet", { "test", vim.g.current_sln_path }, "dotnet test", context, on_line, on_complete)
	end
end

function CurrentSlnOrEmpty()
	local sln = GetCurrentSln()
	if sln then
		return sln
	else
		return ""
	end
end

function RegisterSolution(sln_path)
	vim.g.current_sln_path = sln_path

	if not dotnet_has_set_status_line then
		dotnet_has_set_status_line = true
		vim.o.statusline = vim.o.statusline .. "  %{v:lua.CurrentSlnOrEmpty()}"
	end

	local whichkey = require("which-key")
	whichkey.register({
		s = {
			name = ".NET solution",
			b = { BuildDotNetSolution, "Build .NET solution" },
			t = { TestDotNetSolution, "Test .NET solution" },
		},
	}, { prefix = vim.api.nvim_get_var("maplocalleader"), buffer = vim.api.nvim_get_current_buf() })
end

local function find_nearest_slns()
	local path = vim.fn.expand("%:p:h") -- Get the full path of the current buffer's directory

	while path and path ~= "/" do
		local sln_paths = vim.fn.glob(path .. "/*.sln", nil, true)
		if #sln_paths > 0 then
			return sln_paths
		end
		path = vim.fn.fnamemodify(path, ":h") -- Move up one directory
	end

	return {}
end

local function FindAndRegisterSolution(should_override)
	if not should_override and GetCurrentSln() ~= nil then
		RegisterSolution(GetCurrentSln())
	end

	local solutions = find_nearest_slns()
	if not solutions or #solutions == 0 then
		print("No .sln file found in any parent directory.")
		return
	elseif #solutions == 1 then
		-- Exactly one solution found; register it directly
		RegisterSolution(solutions[1])
	elseif #solutions > 1 then
		-- Multiple solutions found; use Telescope to pick one
		local pickers = require("telescope.pickers")
		local finders = require("telescope.finders")
		local actions = require("telescope.actions")
		local action_state = require("telescope.actions.state")
		local conf = require("telescope.config").values

		pickers
			.new({}, {
				prompt_title = "Select a Solution File",
				finder = finders.new_table({
					results = solutions,
					entry_maker = function(entry)
						return {
							value = entry,
							display = entry,
							ordinal = entry,
						}
					end,
				}),
				sorter = conf.generic_sorter({}),
				attach_mappings = function(prompt_bufnr, _)
					actions.select_default:replace(function()
						local selection = action_state.get_selected_entry()
						actions.close(prompt_bufnr)
						RegisterSolution(selection.value)
					end)
					return true
				end,
			})
			:find()
	end
end

vim.api.nvim_create_autocmd({ "BufReadPost", "BufNewFile" }, {
	pattern = "*.sln",
	callback = function()
		if GetCurrentSln() == nil then
			RegisterSolution(vim.fn.expand("%:p"))
		end
	end,
})

vim.api.nvim_create_autocmd("FileType", {
	pattern = { "fsharp", "cs" },
	callback = function()
		FindAndRegisterSolution(false)
	end,
})