nix/nvim: add gitgutter plugin

nix/progs/nvim/default.nix

@@ -21,6 +21,7 @@ let
     material-vim          # modern theme with true colors support
     vim-nix               # nix support
     vim-easymotion        # highlights keys to move quickly
+    vim-gitgutter         # shows git diff markers in the sign column
     nerdtree              # tree explorer
     nerdtree-git-plugin   # shows files git status on the NerdTree
     neoformat             # formating code

nix/progs/nvim/plugins.vim

@@ -30,3 +30,11 @@ aug fmt
   au!
   au BufWritePre * try | undojoin | Neoformat | catch /E790/ | Neoformat | endtry
 aug END
+
+" GitGutter
+let g:gitgutter_sign_priority = 1
+let g:gitgutter_set_sign_backgrounds = 0
+let g:gitgutter_map_keys = 0
+
+nnoremap <leader>ghp :GitGutterPreviewHunk<CR>
+