Rewrite plugin management configuration

home/.config/nvim/lua/plugins.lua

@@ -1,22 +1,8 @@
+local plugins = require("utility.plugins")
 local vim = require("vim")
 local cmd = vim.cmd
-local api = vim.api
 local fn = vim.fn
 
--- Automatically download (bootstrap) packer plugin manager
--- if it's not already installed
-local packer_install_path = fn.stdpath("data") .. "/site/pack/packer/start/packer.nvim"
-local packer_bootstrap
-if fn.empty(fn.glob(packer_install_path)) > 0 then
-  print("Installing packer plugin manager, please wait...")
-  packer_bootstrap = fn.system({
-      'git', 'clone', '--depth', '1',
-      'https://github.com/wbthomason/packer.nvim',
-      packer_install_path
-  })
-  print("Packer installed, reload vim to install plugins")
-end
-
 -- Automatically run :PackerCompile if plugins.lua is updated
 cmd[[
 augroup packer_user_config
@@ -25,100 +11,59 @@ augroup packer_user_config
 augroup end
 ]]
 
--- Returns the line to be executed after plugin is loaded, this
--- is useful for the `config` parameter of packer's use to
--- source `.vim` files or require `.lua` files
--- Expects a file path from pluginconf/ folder
-local function get_plugin_file(pluginconf_file)
-    local filename, extension = pluginconf_file:match("^(.+)(%..+)$")
-    if (extension == ".vim") then
-        -- Source wants absolute path
-        local pluginconf_path = fn.stdpath("config") .. "lua/pluginconf"
-        local source_line = string.format('source "%s/%s"', pluginconf_path, pluginconf_file)
-        return string.format("vim.fn.execute('%s')", source_line)
-    else
-        -- Require wants relative path from lua/
-        local pluginconf_path = "pluginconf"
-        return string.format('require("%s/%s")', pluginconf_path, filename)
-    end
+
+-- Extend plugins.get_plugin_file function and automatically pass a plugin_directory
+-- into it. Expects a relative path to the plugin file settings from this directory
+local function plug_cfg(plugin_file)
+    local plugin_directory = fn.stdpath("config") .. "lua/pluginconf"
+    plugins.get_plugin_file(plugin_file, plugin_directory)
 end
 
--- Make sure to add packer here, even if it's opt
-api.nvim_command("packadd packer.nvim")
 
 -- Define packer plugins
-return require("packer").startup({
-    function(use)
-        use("wbthomason/packer.nvim")
-        use('airblade/vim-gitgutter')
-        use('dhruvasagar/vim-table-mode')
-        use('tmhedberg/SimpylFold')
-        use('wakatime/vim-wakatime')
-        use('mhinz/vim-startify')
-        use('ryanoasis/vim-devicons')
-        use({
-            "tomasiser/vim-code-dark",
-            config = get_plugin_file("vim-code-dark.lua"),
-        })
-        use({
+local plugin_configs = {
+    { "airblade/vim-gitgutter" },
+    { "dhruvasagar/vim-table-mode" },
+    { "tmhedberg/SimpylFold" },
+    { "wakatime/vim-wakatime" },
+    { "mhinz/vim-startify" },
+    { "ryanoasis/vim-devicons" },
+    { "vimwiki/vimwiki", config = plug_cfg("vimwiki.lua") },
+    { "sheerun/vim-polyglot", setup = plug_cfg("polyglot.lua") },
+    { "tpope/vim-commentary", config = plug_cfg("commentary.lua") },
+    { "junegunn/fzf", run = function() fn['fzf#install']() end },
+    { "tomasiser/vim-code-dark", config = plug_cfg("vim-code-dark.lua") },
+    {
         "vim-airline/vim-airline",
-            config = get_plugin_file("airline.lua"),
+        config = plug_cfg("airline.lua"),
         requires = { "vim-airline/vim-airline-themes", opt = true },
-        })
-        use({
+    },
+    {
         "preservim/nerdtree",
-            config = get_plugin_file("nerdtree.lua"),
+        config = plug_cfg("nerdtree.lua"),
         requires = {
             { "Xuyuanp/nerdtree-git-plugin", opt = true },
             { "tiagofumo/vim-nerdtree-syntax-highlight", opt = true },
         },
-        })
-        use({
-            "vimwiki/vimwiki",
-            config = get_plugin_file("vimwiki.lua")
-        })
-        use({
-            "sheerun/vim-polyglot",
-            setup = get_plugin_file("polyglot.lua")
-        })
-        use({
-            "tpope/vim-commentary",
-            config = get_plugin_file("commentary.lua")
-        })
-        use({
+    },
+    {
         "mfussenegger/nvim-dap",
-            config = get_plugin_file("nvim-dap.lua"),
+        config = plug_cfg("nvim-dap.lua"),
         requires = { "mfussenegger/nvim-dap-python", opt = true },
-        })
-        use({
-            "junegunn/fzf",
-            run = function() fn['fzf#install']() end,
-        })
-        use({
+    },
+    {
         "junegunn/fzf.vim",
-            config = get_plugin_file("fzf.lua"),
+        config = plug_cfg("fzf.lua"),
         after = "fzf",
         requires = { "stsewd/fzf-checkout.vim", opt = true },
-        })
-        use({
+    },
+    {
         "neoclide/coc.nvim",
         branch = "release",
-            config = get_plugin_file("coc.vim"),
+        config = plug_cfg("coc.vim"),
         requires = { "antoinemadec/coc-fzf", opt = true },
-        })
-
-        -- Run sync if we've just bootstrapped packer
-        if packer_bootstrap then
-            require("packer").sync()
-        end
-    end,
-    config = {
-        display = {
-            open_fn = require('packer.util').float,
-        },
-        profile = {
-            enable = true,
-            threshold = 1, -- the amount in ms that a plugins load time must be over for it to be included in the profile
     },
 }
-})
+
+-- Set up packer and use given plugins
+plugins.packer_setup(plugin_configs)

home/.config/nvim/lua/utility/plugins.lua

@@ -0,0 +1,122 @@
+local vim = require("vim")
+local cmd = vim.cmd
+local api = vim.api
+local fn = vim.fn
+
+-- This module contains several functions regarding packer plugin manager
+-- Most notably the get_plugin_file and packer_setup fucntions
+local M = {}
+
+-- Drectory containing the individual plugin configuration files.
+-- File to hold the compiled packer binary
+M.packer_compiled_path = fn.stdpath("config") .. "plugin/packer_compiled.lua"
+
+-- Return the line (string) to be executed with lua that loads in given plugin file.
+-- This is useful for the `config` or `setup` parameters of packer's use to either
+-- source `.vim` files, or require `.lua` files.
+-- Expects a `plugin_file` which is a relative path from the `plugin_directory` folder.
+function M.get_plugin_file(plugin_file, plugin_directory)
+    local filename, extension = plugin_file:match("^(.+)(%..+)$")
+    if (extension == ".vim") then
+        local source_line = string.format('source "%s/%s"', plugin_directory, plugin_file)
+        return string.format("vim.fn.execute('%s')", source_line)
+    else
+        return string.format('require("%s/%s")', plugin_directory, filename)
+    end
+end
+
+-- Download packer plugin manager in case it isn't already installed
+function M.packer_bootstrap()
+    local first_install = false
+    local present, packer = pcall(require, "packer")
+    if not present then
+        local packer_install_path = fn.stdpath("data") .. "/site/pack/packer/start/packer.nvim"
+        print("Clonning pakcer plugin manager, please wait...")
+        -- First remove the directory in case it already exists but packer isn't present
+        fn.delete(packer_install_path, "rf")
+        fn.system({
+            "git", "clone", "--depth", "1",
+            "https://github.com/wbthomason/packer.nvim",
+            packer_install_path
+        })
+
+        -- Make sure packer was installed properly
+        cmd("packadd packer.nvim")
+        present, packer = pcall(require, "packer")
+
+        if present then
+            print("Packer clonned successfully.")
+            first_install = true
+        else
+            print("Couldn't clone packer! Packer path: " .. packer_install_path .. "\n" .. packer)
+        end
+    end
+
+    return { present = present, first_install = first_install, packer = packer }
+end
+
+-- Initialize packer with our desired configuration
+-- If packer isn't instaleld, this also performs the installation
+function M.packer_init()
+    local details = M.packer_bootstrap()
+    -- Only continue if we actually managed to install packer
+    if not details.present then
+        return details
+    end
+
+    details.packer.init({
+        display = {
+            open_fn = function()
+                return require('packer.util').float({ border = "rounded" })
+            end,
+            prompt_border = "rounded",
+        },
+        git = {
+            -- Timeout for git clones in seconds
+            clone_timeout = 600,
+        },
+        profile = {
+            enable = true,
+            -- The time that a pluign's load time must surpass for it to be included
+            -- in the profile (in miliseconds)
+            threshold = 1,
+        },
+        compile_path = M.packer_compiled_path,
+    })
+
+    return details
+end
+
+-- Run packer's setup function and define all of the used plugins
+-- Expects table/list of tables holding the individual plugin settings
+function M.packer_setup(plugin_configs)
+    local details = M.packer_init()
+    if not details.present then
+        return false
+    end
+
+    local packer = details.packer
+    local use = packer.use
+    local first_install = details.first_install
+
+    -- Make sure to add packer here, even if it's opt
+    api.nvim_command("packadd packer.nvim")
+
+    return packer.startup(function()
+        -- We always want to let packer manage itself
+        use("wbthomason/packer.nvim")
+
+        -- Load the obtained plugins (in any)
+        if plugin_configs and not vim.tbl_isempty(plugin_configs) then
+            for _, plugin in pairs(plugin_configs) do
+                use(plugin)
+            end
+        end
+
+        if first_install then
+            packer.sync()
+        end
+    end)
+end
+
+return M