Allow creating "virtual" plugins which load lua script but do not

register with vim-plug

lua/config/_plugins.lua

@@ -24,6 +24,7 @@ return merge({
 
 	require('config/plugins/tmp'),
 
+	require('config/plugins/lang-beancount'),
 	require('config/plugins/lang-php'),
 
 })

lua/config/_settings.lua

@@ -50,6 +50,9 @@ return {
 		-- a file.
 		undofile = true,
 
+		-- Allow mouse only in normal mode
+		mouse = 'n',
+
 	},
 	-- global variables
 	-- these are things you would apply with `let g:thing=value`

lua/config/plugins/lang-beancount.lua

@@ -0,0 +1,17 @@
+return {
+--------------------------------------------------------------------------------
+-- Beancount
+--------------------------------------------------------------------------------
+
+
+	----------------------------------------------------------------------------
+	-- Improve handling of beancount accounting files
+	--
+	{
+		name = 'nukevim/beancount',
+		opts = {
+			virtual = true
+		}
+	},
+
+}

lua/config/plugins/ui.lua

@@ -111,7 +111,8 @@ return {
 	-- Highlight hex codes (and in css, css named colors + rgb/hsl, etc) by
 	-- colouring their background to match the colour.
 	--
-	{ name = 'ap/vim-css-color' },
+	-- Disabled because it's causing warnings when closing files with colours in them.
+	{ enable = false, name = 'ap/vim-css-color' },
 
 	----------------------------------------------------------------------------
 	-- Dim inactive buffers
@@ -146,4 +147,14 @@ return {
 		}
 	},
 
+	----------------------------------------------------------------------------
+	-- Better undotree interface
+	--
+	{
+		name = 'mbbill/undotree',
+		opts = {
+			['on'] = { 'UndotreeToggle' }
+		}
+	},
+
 }

lua/module/plugins.lua

@@ -78,7 +78,7 @@ function M:commit()
 			-- so we can just install it after.
 			if (plugin_enabled and (plugin_installed or self.auto_install) and plugin_required_providers and plugin_required_binaries and plugin_required_plugins) then
 				self:enablePlugin(plugin)
-				if (not plugin_installed) then self.needs_install = true end
+				if (not plugin_installed and not plugin.opts.virtual) then self.needs_install = true end
 				table.remove(plugins, idx)
 
 			-- Otherwise if any of these conditions occur then we know the plugin
@@ -118,7 +118,9 @@ end
 
 -- Once we determine a plugin should be loaded, this actually does it
 function M:enablePlugin(plugin)
-	package_manager:add(plugin.name, plugin.opts)
+	if (plugin.opts.virtual ~= true) then
+		package_manager:add(plugin.name, plugin.opts)
+	end
 
 	-- Register key bindings
 	if (plugin.keys ~= nil) then