Create nix interpreter output

lua/plugconfig.lua

@@ -25,6 +25,11 @@ require("pascal_mode")
 -- Ada mode (supported by plugins)
 require("ada_mode")
 
+-- Markdown Preview
+vim.g.mkdp_auto_start = 0
+vim.g.mkdp_browser = "epiphany"
+vim.g.mkdp_echo_preview_url = 1
+
 -- Misc configuration
 if vim == nil then
 	vim = {}

lua/plugins.lua

@@ -61,10 +61,11 @@ return {
 	{
 		"iamcco/markdown-preview.nvim",
 		cmd = { "MarkdownPreviewToggle", "MarkdownPreview", "MarkdownPreviewStop" },
-		ft = { "markdown" },
-		build = function()
-			vim.fn["mkdp#util#install"]()
+		build = "cd app && npm install",
+		init = function()
+			vim.g.mkdp_filetypes = { "markdown" }
 		end,
+		ft = { "markdown" },
 	},
 
 	-- Themes

lua/vanilla.lua

@@ -45,3 +45,61 @@ vim.keymap.set("n", "<leader>lm", ":set number<cr>")
 -- switch mode
 vim.keymap.set("n", "<leader>na", ":set norelativenumber<cr>")
 vim.keymap.set("n", "<leader>nr", ":set relativenumber<cr>")
+
+-- Nix mode
+local nix_interpreter_buffer = -1
+local nix_interpreter_window = -1
+
+-- @name run_nix_interpreter
+-- @param
+-- @short Run nix and output to a buffer on the right
+local function run_nix_interpreter()
+	local original_win = vim.api.nvim_get_current_win()
+	vim.cmd("vsplit")
+	nix_interpreter_buffer = vim.api.nvim_create_buf(false, true)
+	vim.api.nvim_win_set_buf(0, nix_interpreter_buffer)
+	nix_interpreter_window = vim.api.nvim_get_current_win()
+	vim.api.nvim_set_current_win(original_win)
+end
+
+-- @name update_nix_interpreter
+-- @param
+-- @short Run nix enterpreter on that file.
+local function update_nix_interpreter()
+	local filename = vim.api.nvim_buf_get_name(0)
+	if filename == "" then
+		vim.api.nvim_buf_set_lines(nix_interpreter_buffer, 0, -1, false, {
+			"Error: Current buffer has no file name.",
+		})
+		return
+	end
+	local cmd = { "nix-instantiate", "--eval", filename }
+	local output = vim.fn.systemlist(cmd)
+	if vim.v.shell_error ~= 0 then
+		table.insert(output, 1, "Error running nix-instantiate:")
+	end
+	vim.api.nvim_buf_set_lines(nix_interpreter_buffer, 0, -1, false, output)
+end
+
+-- @name close_nix_interpreter
+-- @param
+-- @short Closes the window and buffer of the interpreter
+local function close_nix_interpreter()
+	vim.api.nvim_buf_delete(nix_interpreter_buffer)
+	vim.api.nvim_win_close(nix_interpreter_window)
+end
+
+vim.api.nvim_create_autocmd({ "BufEnter" }, {
+	pattern = { "*.nix" },
+	callback = run_nix_interpreter,
+})
+
+vim.api.nvim_create_autocmd({ "BufWritePost" }, {
+	pattern = { "*.nix" },
+	callback = update_nix_interpreter,
+})
+
+vim.api.nvim_create_autocmd({ "BufLeave" }, {
+	pattern = { "*.nix" },
+	callback = close_nix_interpreter,
+})