diff --git a/modules/desktop.nix b/modules/desktop.nix
index 380b922..118ad50 100644
--- a/modules/desktop.nix
+++ b/modules/desktop.nix
@@ -83,6 +83,7 @@ in with lib; {
         # custom scripts
         window-screenshot desktop-ctl em-record em-play em-play-loop
         pa_applet
+        brightnessctl
       ];
       # i3 {{{
       xsession = {
@@ -178,6 +179,9 @@ in with lib; {
               "XF86AudioPlay" = "exec playerctl play";
               "XF86AudioStop" = "exec playerctl stop";
 
+              "XF86MonBrightnessUp" = "exec brightnessctl set 5%+";
+              "XF86MonBrightnessDown" = "exec brightnessctl set 5%-";
+
               # macros
               "${mod}+q" = "exec em-record.sh";
               "${mod}+p" = "exec em-play.sh";
diff --git a/modules/neovim.nix b/modules/neovim.nix
index 6aa4ae9..431b830 100644
--- a/modules/neovim.nix
+++ b/modules/neovim.nix
@@ -54,9 +54,11 @@ in with lib; {
         coc = {
           enable = true;
           settings = {
-            rust-analyzer.server.path = "${pkgs.rust-analyzer.outPath}/bin/rust-analyzer";
+            rust-analyzer.server.path = "${pkgs.rust-analyzer}/bin/rust-analyzer";
           };
           pluginConfig = ''
+            let mapleader = "\<Space>"
+
             nmap <silent> gd <Plug>(coc-definition)
             nmap <silent> gy <Plug>(coc-type-definition)
             nmap <silent> gi <Plug>(coc-implementation)
@@ -65,7 +67,57 @@ in with lib; {
             nmap gr <Plug>(coc-rename)
             nmap <leader>ac  <Plug>(coc-codeaction)
             nmap <leader>qf  <Plug>(coc-fix-current)
-          '';
+
+            
+            " Use tab for trigger completion with characters ahead and navigate.
+            " NOTE: There's always complete item selected by default, you may want to enable
+            " no select by `"suggest.noselect": true` in your configuration file.
+            " NOTE: Use command ':verbose imap <tab>' to make sure tab is not mapped by
+            " other plugin before putting this into your config.
+            inoremap <silent><expr> <TAB>
+                  \ coc#pum#visible() ? coc#pum#next(1) :
+                  \ CheckBackspace() ? "\<Tab>" :
+                  \ coc#refresh()
+            inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
+
+            if has('nvim-0.4.0') || has('patch-8.2.0750')
+              nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
+              nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
+              inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
+              inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
+              vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
+              vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
+            endif
+
+
+            " Make <CR> to accept selected completion item or notify coc.nvim to format
+            " <C-g>u breaks current undo, please make your own choice.
+            inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
+                                          \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
+
+            function! CheckBackspace() abort
+              let col = col('.') - 1
+              return !col || getline('.')[col - 1]  =~# '\s'
+            endfunction
+                        " Make <CR> to accept selected completion item or notify coc.nvim to format
+            " <C-g>u breaks current undo, please make your own choice.
+            inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm()
+                                          \: "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
+
+            function! CheckBackspace() abort
+              let col = col('.') - 1
+              return !col || getline('.')[col - 1]  =~# '\s'
+            endfunction
+
+            " Use <c-space> to trigger completion.
+            if has('nvim')
+              inoremap <silent><expr> <c-space> coc#refresh()
+            else
+              inoremap <silent><expr> <c-@> coc#refresh()
+            endif
+            
+            nmap <leader>rn <Plug>(coc-rename)
+            '';
         };
         # }}}
         extraConfig = ''
@@ -91,48 +143,6 @@ in with lib; {
           set cindent
           set tabstop=4
           set shiftwidth=4
-
-          " Emacs Insert mode/command mode hotkeys {{{
-          " movement
-          inoremap <C-f> <Right>
-          inoremap <C-b> <Left>
-          inoremap <C-p> <Up>
-          inoremap <C-n> <Down>
-          cnoremap <C-f> <Right>
-          cnoremap <C-b> <Left>
-          cnoremap <C-p> <Up>
-          cnoremap <C-n> <Down>
-
-          inoremap <C-e> <C-o>$
-          inoremap <C-a> <C-o>_
-          cnoremap <C-e> <C-o>$
-          cnoremap <C-a> <C-o>_
-
-          inoremap <M-f> <C-Right>
-          inoremap <M-b> <C-Left>
-          inoremap <M-e> <C-o>)
-          inoremap <M-a> <C-o>(
-          cnoremap <M-f> <C-Right>
-          cnoremap <M-b> <C-Left>
-          cnoremap <M-e> <C-o>)
-          cnoremap <M-a> <C-o>(
-
-          inoremap <M-<> <Esc>ggi
-          inoremap <M->> <Esc>Gi
-          cnoremap <M-<> <Esc>ggi
-          cnoremap <M->> <Esc>Gi
-
-          " editing
-          inoremap <C-d> <Del>
-          inoremap <M-BS> <C-o>db
-          inoremap <M-d> <C-o>de
-          cnoremap <C-d> <Del>
-          cnoremap <M-BS> <C-o>db
-          cnoremap <M-d> <C-o>de
-
-          inoremap <C-s> <C-o>/
-          inoremap <C-r> <C-o>?
-          " }}}
         '';
       };
     };