nixvim(ui): install telescope

nixvim/config/default.nix

@@ -8,6 +8,7 @@
     # appearence
     ./bufferline.nix
     ./lualine.nix
+    ./telescope.nix
 
     # language support & lsp
     ./lsp.nix

nixvim/config/options.nix

@@ -2,4 +2,6 @@
   opts = {
     number = true;
   };
+
+  globals.mapleader = " ";
 }

nixvim/config/telescope.nix

@@ -0,0 +1,43 @@
+{
+  plugins.telescope = {
+    enable = true;
+    keymaps = {
+      "<leader><space>" = {
+        action = "find_files";
+        options = {
+          desc = "Find files in current directory";
+        };
+      };
+      "<leader>f" = {
+        action = "find_files";
+        options = {
+          desc = "Find files in current directory";
+        };
+      };
+      "<leader>/" = {
+        action = "live_grep";
+        options = {
+          desc = "Grep (root dir)";
+        };
+      };
+      "<leader>b" = {
+        action = "buffers";
+        options = {
+          desc = "Buffer list";
+        };
+      };
+      "<leader>fr" = {
+        action = "oldfiles";
+        options = {
+          desc = "Recent files";
+        };
+      };
+      "<leader>sD" = {
+        action = "diagnostics";
+        options = {
+          desc = "Workspace diagnostics";
+        };
+      };
+    };
+  };
+}