added nvim-tree, autosave, and autopair plugins

lua/custom/plugins/autosave.lua

@@ -0,0 +1,37 @@
+return {
+  'pocco81/auto-save.nvim',
+  opts = {
+    enabled = true,    -- start auto-save when the plugin is loaded (i.e. when your package manager loads it)
+    execution_message = {
+      message = function() -- message to print on save
+        return ("AutoSave: saved at " .. vim.fn.strftime("%H:%M:%S"))
+      end,
+      dim = 0.18,                                    -- dim the color of `message`
+      cleaning_interval = 1250,                      -- (milliseconds) automatically clean MsgArea after displaying `message`. See :h MsgArea
+    },
+    trigger_events = { "InsertLeave", "TextChanged" }, -- vim events that trigger auto-save. See :h events
+    -- function that determines whether to save the current buffer or not
+    -- return true: if buffer is ok to be saved
+    -- return false: if it's not ok to be saved
+    condition = function(buf)
+      local fn = vim.fn
+      local utils = require("auto-save.utils.data")
+
+      if
+          fn.getbufvar(buf, "&modifiable") == 1 and
+          utils.not_in(fn.getbufvar(buf, "&filetype"), {}) then
+        return true            -- met condition(s), can save
+      end
+      return false             -- can't save
+    end,
+    write_all_buffers = false, -- write all buffers when the current one meets `condition`
+    debounce_delay = 135,      -- saves the file at most every `debounce_delay` milliseconds
+    callbacks = {              -- functions to be executed at different intervals
+      enabling = nil,          -- ran when enabling auto-save
+      disabling = nil,         -- ran when disabling auto-save
+      before_asserting_save = nil, -- ran before checking `condition`
+      before_saving = nil,     -- ran before doing the actual save
+      after_saving = nil       -- ran after doing the actual save
+    }
+  }
+}