Generalize plugin enable/disable API

Signed-off-by: Micah Halter <micah@balena.io>

.luacheckrc

@@ -8,6 +8,7 @@ globals = {
   "_HTOP_TOGGLE",
   "vim",
   "C",
+  "packer_plugins",
 }
 
 -- Rerun tests only if their modification time changed

init.lua

@@ -11,15 +11,17 @@ utils.bootstrap()
 
 local sources = {
   "core.options",
-  "core.autocmds",
   "core.plugins",
+  "core.autocmds",
   "core.mappings",
 }
 
 for _, source in ipairs(sources) do
   local status_ok, fault = pcall(require, source)
   if not status_ok then
     error("Failed to load " .. source .. "\n\n" .. fault)
+  elseif source == "core.plugins" then
+    utils.compiled()
   end
 end
 
@@ -32,8 +34,6 @@ if status_ok then
   end
 end
 
-utils.compiled()
-
 local polish = utils.user_plugin_opts "polish"
 if type(polish) == "function" then
   polish()

lua/core/autocmds.lua

@@ -1,7 +1,6 @@
 local M = {}
 
 local utils = require "core.utils"
-local config = utils.user_settings()
 
 vim.cmd [[
   augroup packer_user_config
@@ -18,7 +17,7 @@ vim.cmd [[
   augroup end
 ]]
 
-if config.enabled.dashboard and config.enabled.bufferline then
+if utils.is_available "dashboard-nvim" and utils.is_available "bufferline.nvim" then
   vim.cmd [[
     augroup dashboard_settings
       autocmd!

lua/core/mappings.lua

@@ -1,6 +1,6 @@
 local M = {}
 
-local config = require("core.utils").user_settings()
+local utils = require "core.utils"
 
 local opts = { noremap = true, silent = true }
 local map = vim.api.nvim_set_keymap
@@ -24,7 +24,7 @@ map("n", "<C-Left>", "<cmd>lua require'smart-splits'.resize_left(2)<cr>", opts)
 map("n", "<C-Right>", "<cmd>lua require'smart-splits'.resize_right(2)<cr>", opts)
 
 -- Navigate buffers
-if config.enabled.bufferline then
+if utils.is_available "bufferline.nvim" then
   map("n", "<S-l>", "<cmd>BufferLineCycleNext<cr>", opts)
   map("n", "<S-h>", "<cmd>BufferLineCyclePrev<cr>", opts)
   map("n", "}", "<cmd>BufferLineMoveNext<cr>", opts)
@@ -57,13 +57,13 @@ map("n", "<leader>li", "<cmd>LspInfo<cr>", opts)
 map("n", "<leader>lI", "<cmd>LspInstallInfo<cr>", opts)
 
 -- NeoTree
-if config.enabled.neo_tree then
+if utils.is_available "neo-tree.nvim" then
   map("n", "<leader>e", "<cmd>Neotree toggle<CR>", opts)
   map("n", "<leader>o", "<cmd>Neotree focus<CR>", opts)
 end
 
 -- Dashboard
-if config.enabled.dashboard then
+if utils.is_available "dashboard-nvim" then
   map("n", "<leader>d", "<cmd>Dashboard<CR>", opts)
   map("n", "<leader>fn", "<cmd>DashboardNewFile<CR>", opts)
   map("n", "<leader>db", "<cmd>Dashboard<CR>", opts)
@@ -73,7 +73,7 @@ if config.enabled.dashboard then
 end
 
 -- GitSigns
-if config.enabled.gitsigns then
+if utils.is_available "gitsigns.nvim" then
   map("n", "<leader>gj", "<cmd>lua require 'gitsigns'.next_hunk()<cr>", opts)
   map("n", "<leader>gk", "<cmd>lua require 'gitsigns'.prev_hunk()<cr>", opts)
   map("n", "<leader>gl", "<cmd>lua require 'gitsigns'.blame_line()<cr>", opts)
@@ -123,7 +123,7 @@ map("n", "<leader>lr", "<cmd>lua vim.lsp.buf.rename()<CR>", opts)
 map("n", "<leader>ld", "<cmd>lua vim.diagnostic.open_float()<CR>", opts)
 
 -- Comment
-if config.enabled.comment then
+if utils.is_available "Comment.nvim" then
   map("n", "<leader>/", "<cmd>lua require('Comment.api').toggle_current_linewise()<cr>", opts)
   map("v", "<leader>/", "<esc><cmd>lua require('Comment.api').toggle_linewise_op(vim.fn.visualmode())<CR>", opts)
 end
@@ -135,7 +135,7 @@ map("n", "<C-s>", "<cmd>w!<CR>", opts)
 map("n", "<C-q>", "<cmd>q!<CR>", opts)
 
 -- Terminal
-if config.enabled.toggle_term then
+if utils.is_available "nvim-toggleterm.lua" then
   map("n", "<C-\\>", "<cmd>ToggleTerm<CR>", opts)
   map("n", "<leader>gg", "<cmd>lua require('core.utils').toggle_term_cmd('lazygit')<CR>", opts)
   map("n", "<leader>tn", "<cmd>lua require('core.utils').toggle_term_cmd('node')<CR>", opts)
@@ -149,7 +149,7 @@ if config.enabled.toggle_term then
 end
 
 -- SymbolsOutline
-if config.enabled.symbols_outline then
+if utils.is_available "symbols-outline.nvim" then
   map("n", "<leader>lS", "<cmd>SymbolsOutline<CR>", opts)
 end
 

lua/core/utils.lua

@@ -159,6 +159,10 @@ function M.label_plugins(plugins)
   return labelled
 end
 
+function M.is_available(plugin)
+  return packer_plugins ~= nil and packer_plugins[plugin] ~= nil
+end
+
 function M.update()
   local Job = require "plenary.job"