Squashed commit of the following:

commit a39cd5398670443fb6eb1b5e644a348c0ed86662
Author: aceforeverd <teapot@aceforeverd.com>
Date:   Sun Sep 1 10:53:07 2024 +0800

    cd.lua

commit 421f185
Author: aceforeverd <teapot@aceforeverd.com>
Date:   Sat Aug 31 13:37:29 2024 +0800

    Initial find root function from project.nvim

lua/aceforeverd/cd.lua

@@ -0,0 +1,55 @@
+--- Set directory for curent buffer. By LSPs firstly, if non available, use fallback function
+--- @param fallback {fn: function, hint: string} Fallback function info returns root directory as string
+local function find_root(fallback)
+  local ft = vim.api.nvim_get_option_value('filetype', { buf = 0 })
+  local clients = vim.lsp.get_clients({ bufnr = 0 })
+
+  local dirs = vim
+    .iter(clients)
+    :filter(function(client)
+      local filetypes = client.config.filetypes
+      if filetypes and vim.tbl_contains(filetypes, ft) then
+        return true
+      end
+
+      return false
+    end)
+    :map(function(client)
+      return { root = client.config.root_dir, client = client.name }
+    end)
+    :totable()
+
+  if type(fallback) == 'table' then
+    local dir = fallback.fn()
+    if dir ~= nil and dir ~= '' then
+      table.insert(dirs, { root = dir, client = fallback.hint })
+    end
+  end
+
+  if #dirs == 0 then
+    vim.notify('no rule to cd')
+    return
+  end
+
+  local verbose_status = vim.trim(vim.fn.execute('verbose pwd'))
+
+  vim.ui.select(dirs, {
+    prompt = 'SELECT ROOT. ' .. verbose_status,
+    format_item = function(info)
+      return string.format('%s [%s]', info.root, info.client)
+    end,
+  }, function(choice)
+    if choice ~= nil then
+      if vim.fn.getcwd() ~= choice.root then
+        vim.notify('setting root to ' .. choice.root, vim.log.levels.INFO, {})
+        vim.fn.chdir(choice.root)
+      else
+        vim.notify('root already in ' .. choice.root, vim.log.levels.INFO, {})
+      end
+    end
+  end)
+end
+
+return {
+  find_root = find_root,
+}

lua/aceforeverd/cmd.lua

@@ -11,7 +11,7 @@ return {
     -- Sg <pattern> [<dir1> <dir2> ...]
     vim.api.nvim_create_user_command(
       'Sg',
-      require('aceforeverd.keymap.init').ast_grep_search,
+      require('aceforeverd.grep').ast_grep,
       -- TODO: custom complete function
       { nargs = '+', desc = 'ast grep search', complete = 'dir' }
     )

lua/aceforeverd/grep.lua

@@ -0,0 +1,40 @@
+--[[--
+Copyright (c) 2024 Ace <teapot@aceforeverd.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+--]]--
+
+---@param opts table ast grep search pattern
+local function ast_grep_search(opts)
+  local args = opts.fargs
+  local pattern = args[1]
+
+  local cmds = { 'ast-grep', 'run', '--heading', 'never', '--pattern', pattern }
+  for i = 2, #args, 1 do
+    table.insert(cmds, args[i])
+  end
+
+  local expr = string.format(
+    'system([%s])',
+    vim.iter(cmds):map(function(v)
+      return vim.fn.shellescape(v)
+    end):join(", ")
+  )
+  vim.cmd('lgetexpr ' .. expr)
+  vim.cmd('lopen')
+end
+
+return {
+  ast_grep = ast_grep_search
+}

lua/aceforeverd/init.lua

@@ -59,6 +59,7 @@ function M.setup()
   })
 
   require('aceforeverd.cmd').setup()
+  require('aceforeverd.keymap').setup()
   require('aceforeverd.plugins').setup()
 
   -- keymap guideline

lua/aceforeverd/keymap/init.lua

@@ -1,24 +1,8 @@
----@param opts table ast grep search pattern
-local function ast_grep_search(opts)
-  local args = opts.fargs
-  local pattern = args[1]
-
-  local cmds = { 'ast-grep', 'run', '--heading', 'never', '--pattern', pattern }
-  for i = 2, #args, 1 do
-    table.insert(cmds, args[i])
-  end
-
-  local expr = string.format(
-    'system([%s])',
-    vim.iter(cmds):map(function(v)
-      return vim.fn.shellescape(v)
-    end):join(", ")
-  )
-  vim.cmd('lgetexpr ' .. expr)
-  vim.cmd('lopen')
-end
-
 return {
+  setup = function()
+    vim.keymap.set('n', '<leader>cd', function()
+      require('aceforeverd.cd').find_root({ fn = vim.fn['FindRootDirectory'], hint = 'vim-rooter' })
+    end, { desc = 'set root directory', remap = false })
+  end,
   select_browse_plugin = require('aceforeverd.keymap.plugin_browse').select_browse_plugin,
-  ast_grep_search = ast_grep_search,
 }

lua/aceforeverd/lsp/init.lua

@@ -67,7 +67,7 @@ function M.go()
         fieldalignment = true,
         shadow = true,
       },
-    }
+    },
   }
   go_cfg.capabilities.textDocument.completion.dynamicRegistration = true