init

lua/timer/init.lua

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+-- Creates an object for the module. All of the module's
+-- functions are associated with this object, which is
+-- returned when the module is called with `require`.
+local M = {}
+
+function M.greet()
+  print("Hello World")
+end
+
+-- Routes calls made to this module to functions in the
+-- plugin's other modules.
+return M

plugin/timer.vim

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+" Title:        Example Plugin
+" Description:  A plugin to provide an example for creating Neovim plugins.
+" Last Change:  8 November 2021
+" Maintainer:   Example User <https://github.com/example-user>
+
+" Prevents the plugin from being loaded multiple times. If the loaded
+" variable exists, do nothing more. Otherwise, assign the loaded
+" variable and continue running this instance of the plugin.
+if exists("g:loaded_exampleplugin")
+    finish
+endif
+let g:loaded_exampleplugin = 1
+
+" Defines a package path for Lua. This facilitates importing the
+" Lua modules from the plugin's dependency directory.
+let s:lua_rocks_deps_loc =  expand("<sfile>:h:r") . "/../lua/example-plugin/deps"
+exe "lua package.path = package.path .. '"
+" Exposes the plugin's functions for use as commands in Neovim.
+command! -nargs=0 Greet lua require("example-plugin").greet()