Split plugin loading logic from the configuration (#796)

lua/plugin-loader.lua

@@ -0,0 +1,46 @@
+local plugin_loader = {}
+
+function plugin_loader:init()
+  local execute = vim.api.nvim_command
+  local fn = vim.fn
+
+  local install_path = fn.stdpath "data" .. "/site/pack/packer/start/packer.nvim"
+  if fn.empty(fn.glob(install_path)) > 0 then
+    execute("!git clone https://github.com/wbthomason/packer.nvim " .. install_path)
+    execute "packadd packer.nvim"
+  end
+
+  local packer_ok, packer = pcall(require, "packer")
+  if not packer_ok then
+    return
+  end
+
+  packer.init {
+    -- package_root = require("packer.util").join_paths(vim.fn.stdpath "data", "lvim", "pack"),
+    git = { clone_timeout = 300 },
+    display = {
+      open_fn = function()
+        return require("packer.util").float { border = "single" }
+      end,
+    },
+  }
+
+  self.packer = packer
+  return self
+end
+
+function plugin_loader:load(configurations)
+  return self.packer.startup(function(use)
+    for _, plugins in ipairs(configurations) do
+      for _, plugin in ipairs(plugins) do
+        use(plugin)
+      end
+    end
+  end)
+end
+
+return {
+  init = function()
+    return plugin_loader:init()
+  end,
+}