make telescope work better in projects

lua/conf/plugins/telescope.lua

@@ -1,6 +1,26 @@
 local misc = require("core.misc")
 local map = misc.map
 
+--- get the root directory for telescope to search
+---@return string the root directory
+local function root_dir()
+  local clients = vim.lsp.get_clients({ bufnr = 0 })
+  if #clients > 0 then
+    return clients[1].config.root_dir
+  end
+
+  return "."
+end
+
+--- wrap a telebuilt picker to make it work for the current project root
+---@param fn function telebuilt function
+---@return function the new function
+local function telebuilt_picker(fn)
+  return function()
+    fn { cwd = root_dir() }
+  end
+end
+
 return { "nvim-telescope/telescope.nvim",
   disable = not vim.fn.has("nvim-0.9.0"),
   requires = {
@@ -56,12 +76,14 @@ return { "nvim-telescope/telescope.nvim",
 
     -- keymaps
     local telebuilt = require("telescope.builtin")
-    map("n", "<leader>f", telebuilt.find_files, { desc = "Find files." })
-    map("n", "<leader>o", telebuilt.oldfiles, { desc = "Find old." })
-    map("n", "<leader>s", telebuilt.live_grep, { desc = "Find strings." })
-    map("n", "<leader>i", telebuilt.help_tags, {
-      desc = "find help tags."
+    map("n", "<leader>f", telebuilt_picker(telebuilt.find_files), {
+      desc = "Find files."
     })
+    map("n", "<leader>o", telebuilt.oldfiles, { desc = "Find old." })
+    map("n", "<leader>s", telebuilt_picker(telebuilt.live_grep), {
+      desc = "Find strings."
+    })
+    map("n", "<leader>i", telebuilt.help_tags, { desc = "find help tags." })
     map("n", "<leader>l", telebuilt.lsp_document_symbols, {
       desc = "Find symbols."
     })
@@ -78,7 +100,9 @@ return { "nvim-telescope/telescope.nvim",
 
     -- enable previewing in the default colorscheme switcher
     telebuilt.colorscheme = function()
-      require("telescope.builtin.__internal").colorscheme { enable_preview = true }
+      require("telescope.builtin.__internal").colorscheme {
+        enable_preview = true
+      }
     end
   end
 }