Improve startuptime | remove un-needed plugins | lazy load plugin highlights too

removed nvim-gps as nvim-navic or winbar.nvim will be added when v0.8 neovim releases. Removed lsp signature as I was able to emulate showing args with the default signature help() window

lua/core/lazy_load.lua

@@ -0,0 +1,111 @@
+-- https://github.com/max397574/omega-nvim/blob/master/lua/omega/modules/ui/bufferline.lua
+local lazy_load = function(tb)
+   vim.api.nvim_create_autocmd(tb.events, {
+      pattern = "*",
+      group = vim.api.nvim_create_augroup(tb.augroup_name, {}),
+      callback = function()
+         if tb.condition() then
+            vim.api.nvim_del_augroup_by_name(tb.augroup_name)
+
+            -- dont defer for treesitter as it will show slow highlighting
+            -- This deferring only happens only when we do "nvim filename"
+            if tb.plugins ~= "nvim-treesitter" then
+               vim.defer_fn(function()
+                  vim.cmd("PackerLoad " .. tb.plugins)
+               end, 0)
+            else
+               vim.cmd("PackerLoad " .. tb.plugins)
+            end
+         end
+      end,
+   })
+end
+
+local M = {}
+
+M.bufferline = function()
+   lazy_load {
+      events = { "BufNewFile", "BufAdd", "TabEnter" },
+      augroup_name = "BufferLineLazy",
+      plugins = "bufferline.nvim",
+
+      condition = function()
+         return #vim.fn.getbufinfo { buflisted = 1 } >= 2
+      end,
+   }
+end
+
+M.colorizer = function()
+   lazy_load {
+      events = { "BufRead", "BufNewFile" },
+      augroup_name = "ColorizerLazy",
+      plugins = "nvim-colorizer.lua",
+
+      condition = function()
+         local items = { "#", "rgb", "hsl" }
+
+         for _, val in ipairs(items) do
+            if vim.fn.search(val) ~= 0 then
+               return true
+            end
+         end
+      end,
+   }
+end
+
+-- load certain plugins only when there's a file opened in the buffer
+-- if "nvim-file" is executed -> load the plugin after nvim gui loads
+-- This gives an instant preview of nvim with the file opened
+
+M.on_file_open = function()
+   lazy_load {
+      events = { "BufRead", "BufWinEnter", "BufNewFile" },
+      augroup_name = "BeLazyOnFileOpen",
+      plugins = "nvim-lsp-installer indent-blankline.nvim",
+
+      condition = function()
+         local file = vim.fn.expand "%"
+         return file ~= "NvimTree_1" and file ~= "[packer]" and file ~= ""
+      end,
+   }
+end
+
+M.treesitter = function()
+   lazy_load {
+      events = { "BufRead", "BufWinEnter", "BufNewFile" },
+      augroup_name = "Treesitter_lazy",
+      plugins = "nvim-treesitter",
+
+      condition = function()
+         local file = vim.fn.expand "%"
+         return file ~= "NvimTree_1" and file ~= "[packer]" and file ~= ""
+      end,
+   }
+end
+
+M.gitsigns = function()
+   -- taken from https://github.com/max397574
+   vim.api.nvim_create_autocmd({ "BufAdd", "VimEnter" }, {
+      callback = function()
+         local function onexit(code, _)
+            if code == 0 then
+               vim.schedule(function()
+                  require("packer").loader "gitsigns.nvim"
+               end)
+            end
+         end
+         local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
+         if lines ~= { "" } then
+            vim.loop.spawn("git", {
+               args = {
+                  "ls-files",
+                  "--error-unmatch",
+                  vim.fn.expand "%",
+               },
+            }, onexit)
+         end
+      end,
+   })
+end
+
+return M