chore(setup): make setup idempotent (#1340)

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree.lua

@@ -13,6 +13,7 @@ local core = require "nvim-tree.core"
 local reloaders = require "nvim-tree.actions.reloaders"
 local copy_paste = require "nvim-tree.actions.copy-paste"
 local collapse_all = require "nvim-tree.actions.collapse-all"
+local git = require "nvim-tree.git"
 
 local _config = {}
 
@@ -323,7 +324,7 @@ function M.change_dir(name)
 end
 
 local function setup_autocommands(opts)
-  local augroup_id = api.nvim_create_augroup("NvimTree", {})
+  local augroup_id = api.nvim_create_augroup("NvimTree", { clear = true })
   local function create_nvim_tree_autocmd(name, custom_opts)
     local default_opts = { group = augroup_id }
     api.nvim_create_autocmd(name, vim.tbl_extend("force", default_opts, custom_opts))
@@ -391,6 +392,16 @@ local function setup_autocommands(opts)
       end,
     })
   end
+
+  if opts.diagnostics.enable then
+    create_nvim_tree_autocmd("DiagnosticChanged", {
+      callback = require("nvim-tree.diagnostics").update,
+    })
+    create_nvim_tree_autocmd("User", {
+      pattern = "CocDiagnosticChange",
+      callback = require("nvim-tree.diagnostics").update,
+    })
+  end
 end
 
 local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
@@ -623,11 +634,6 @@ function M.setup(conf)
     return
   end
 
-  if M.setup_called then
-    utils.warn "nvim-tree.lua setup called multiple times"
-    return
-  end
-  M.setup_called = true
   M.init_root = vim.fn.getcwd()
 
   legacy.migrate_legacy_options(conf or {})
@@ -668,8 +674,24 @@ function M.setup(conf)
     require("nvim-web-devicons").setup()
   end
 
-  setup_vim_commands()
   setup_autocommands(opts)
+  require("nvim-tree.watcher").purge_watchers()
+
+  if not M.setup_called then
+    setup_vim_commands()
+  end
+
+  if M.setup_called and view.is_visible() then
+    view.close()
+    view.abandon_current_window()
+  end
+
+  if M.setup_called and core.get_explorer() ~= nil then
+    git.purge_state()
+    TreeExplorer = nil
+  end
+
+  M.setup_called = true
 
   vim.schedule(function()
     M.on_enter(netrw_disabled)

lua/nvim-tree/actions/init.lua

@@ -7,8 +7,7 @@ local util = require "nvim-tree.utils"
 local nvim_tree_callback = require("nvim-tree.config").nvim_tree_callback
 
 -- BEGIN_DEFAULT_MAPPINGS
-local M = {
-  mappings = {
+local DEFAULT_MAPPINGS = {
   {
     key = { "<CR>", "o", "<2-LeftMouse>" },
     action = "edit",
@@ -219,11 +218,14 @@ local M = {
     action = "toggle_help",
     desc = "toggle help",
   },
-  },
-  custom_keypress_funcs = {},
 }
 -- END_DEFAULT_MAPPINGS
 
+local M = {
+  mappings = {},
+  custom_keypress_funcs = {},
+}
+
 local keypress_funcs = {
   close = view.close,
   close_node = require("nvim-tree.actions.movements").parent_node(true),
@@ -397,6 +399,22 @@ local function copy_mappings(user_mappings)
   return user_mappings
 end
 
+local function cleanup_existing_mappings()
+  local bufnr = view.get_bufnr()
+  if bufnr == nil or not a.nvim_buf_is_valid(bufnr) then
+    return
+  end
+  for _, b in pairs(M.mappings) do
+    if type(b.key) == "table" then
+      for _, key in pairs(b.key) do
+        a.nvim_buf_del_keymap(bufnr, b.mode or "n", key)
+      end
+    else
+      a.nvim_buf_del_keymap(bufnr, b.mode or "n", b.key)
+    end
+  end
+end
+
 local DEFAULT_MAPPING_CONFIG = {
   custom_only = false,
   list = {},
@@ -413,6 +431,9 @@ function M.setup(opts)
   require("nvim-tree.actions.copy-paste").setup(opts)
   require("nvim-tree.actions.expand-all").setup(opts)
 
+  cleanup_existing_mappings()
+  M.mappings = vim.deepcopy(DEFAULT_MAPPINGS)
+
   local user_map_config = (opts.view or {}).mappings or {}
   local options = vim.tbl_deep_extend("force", DEFAULT_MAPPING_CONFIG, user_map_config)
   if options.custom_only then

lua/nvim-tree/diagnostics.lua

@@ -8,16 +8,6 @@ local M = {}
 
 local GROUP = "NvimTreeDiagnosticSigns"
 
-local function get_lowest_severity(diagnostics)
-  local severity = math.huge
-  for _, v in ipairs(diagnostics) do
-    if v.severity < severity then
-      severity = v.severity
-    end
-  end
-  return severity
-end
-
 local severity_levels = { Error = 1, Warning = 2, Information = 3, Hint = 4 }
 local sign_names = {
   { "NvimTreeSignError", "NvimTreeLspDiagnosticsError" },
@@ -38,10 +28,6 @@ end
 local function from_nvim_lsp()
   local buffer_severity = {}
 
-  -- vim.lsp.diagnostic.get_all was deprecated in nvim 0.7 and replaced with vim.diagnostic.get
-  -- This conditional can be removed when the minimum required version of nvim is changed to 0.7.
-  if vim.diagnostic then
-    -- nvim version >= 0.7
   for _, diagnostic in ipairs(vim.diagnostic.get()) do
     local buf = diagnostic.bufnr
     if a.nvim_buf_is_valid(buf) then
@@ -52,18 +38,6 @@ local function from_nvim_lsp()
       end
     end
   end
-  else
-    -- nvim version < 0.7
-    for buf, diagnostics in pairs(vim.lsp.diagnostic.get_all()) do
-      if a.nvim_buf_is_valid(buf) then
-        local bufname = a.nvim_buf_get_name(buf)
-        if not buffer_severity[bufname] then
-          local severity = get_lowest_severity(diagnostics)
-          buffer_severity[bufname] = severity
-        end
-      end
-    end
-  end
 
   return buffer_severity
 end
@@ -157,6 +131,11 @@ local links = {
 
 function M.setup(opts)
   M.enable = opts.diagnostics.enable
+
+  if M.enable then
+    log.line("diagnostics", "setup")
+  end
+
   M.show_on_dirs = opts.diagnostics.show_on_dirs
   vim.fn.sign_define(sign_names[1][1], { text = opts.diagnostics.icons.error, texthl = sign_names[1][2] })
   vim.fn.sign_define(sign_names[2][1], { text = opts.diagnostics.icons.warning, texthl = sign_names[2][2] })
@@ -166,17 +145,6 @@ function M.setup(opts)
   for lhs, rhs in pairs(links) do
     vim.cmd("hi def link " .. lhs .. " " .. rhs)
   end
-
-  if M.enable then
-    log.line("diagnostics", "setup")
-    a.nvim_create_autocmd("DiagnosticChanged", {
-      callback = M.update,
-    })
-    a.nvim_create_autocmd("User", {
-      pattern = "CocDiagnosticChange",
-      callback = M.update,
-    })
-  end
 end
 
 return M

lua/nvim-tree/explorer/filters.lua

@@ -64,6 +64,7 @@ function M.setup(opts)
     filter_git_ignored = opts.git.ignore,
   }
 
+  M.ignore_list = {}
   M.exclude_list = opts.filters.exclude
 
   local custom_filter = opts.filters.custom

lua/nvim-tree/git/init.lua

@@ -134,6 +134,11 @@ function M.load_project_status(cwd)
   return M.projects[project_root]
 end
 
+function M.purge_state()
+  M.projects = {}
+  M.cwd_to_project_root = {}
+end
+
 function M.setup(opts)
   M.config = opts.git
   M.config.watcher = opts.filesystem_watchers

lua/nvim-tree/watcher.lua

@@ -3,14 +3,14 @@ local uv = vim.loop
 local log = require "nvim-tree.log"
 local utils = require "nvim-tree.utils"
 
-local M = {}
-local Watcher = {
+local M = {
   _watchers = {},
 }
+local Watcher = {}
 Watcher.__index = Watcher
 
 function Watcher.new(opts)
-  for _, existing in ipairs(Watcher._watchers) do
+  for _, existing in ipairs(M._watchers) do
     if existing._opts.absolute_path == opts.absolute_path then
       log.line("watcher", "Watcher:new using existing '%s'", opts.absolute_path)
       return existing
@@ -25,7 +25,7 @@ function Watcher.new(opts)
 
   watcher = watcher:start()
 
-  table.insert(Watcher._watchers, watcher)
+  table.insert(M._watchers, watcher)
 
   return watcher
 end
@@ -74,4 +74,11 @@ end
 
 M.Watcher = Watcher
 
+function M.purge_watchers()
+  for _, watcher in pairs(M._watchers) do
+    watcher:stop()
+  end
+  M._watchers = {}
+end
+
 return M

scripts/generate_default_mappings.lua

@@ -9,7 +9,7 @@ local max_action_help = 0
 local outs_help = {}
 local outs_lua = {}
 
-for _, m in pairs(M.mappings) do
+for _, m in pairs(DEFAULT_MAPPINGS) do
   local out
   if type(m.key) == "table" then
     local first = true