Add coc.nvim with all kind of settings, etc.

custom.vim.example

@@ -1,3 +1,4 @@
 "Here you can define your own custom settings like
 "let g:use_sound = 1
-"let g:use_autocomplete = 2
+"let g:use_autocomplete = 1
+"let g:use_coc = 1

init.vim

@@ -97,6 +97,7 @@ let g:use_autocomplete=1
 let g:use_bufkill = 1
 let g:use_buftabline = 1
 let g:use_clang_format = 0
+let g:use_coc = 0
 let g:use_comfortable_motion = 0
 let g:use_cpp = 1
 let g:use_font = 0
@@ -111,6 +112,7 @@ let g:use_nerdtree = 1
 let g:use_pandoc = 0
 let g:use_polyglot = 0
 let g:use_python = 1
+let g:use_rust = 1
 let g:use_sound = 0
 let g:use_sxhkd = 1
 let g:use_templator = 0
@@ -265,6 +267,22 @@ if g:use_javacomplete == 1
 endif
 " ===
 
+" ===
+" CoC
+" ===
+if g:use_coc == 1
+    Plug 'neoclide/coc.nvim', {'branch': 'release'}
+endif
+" ===
+
+" ===
+" Rust
+" ===
+if g:use_rust == 1
+    Plug 'rust-lang/rust.vim'
+endif
+" ===
+
 " ===
 " Special functionality
 " ===
@@ -565,6 +583,60 @@ if g:use_autocomplete == 3
 endif
 " ===
 
+" ===
+" Setup CoC
+" ===
+if g:use_coc == 1
+    set updatetime=300
+
+    set shortmess+=c
+
+    if has("patch-8.1.1564")
+        set signcolumn=number
+    else
+        set signcolumn=yes
+    endif
+
+    inoremap <silent><expr> <C-Space> coc#refresh()
+
+    nmap <silent> [g <Plug>(coc-diagnostic-prev)
+    nmap <silent> ]g <Plug>(coc-diagnostic-next)
+
+    nmap <silent> gd <Plug>(coc-definition)
+    nmap <silent> gy <Plug>(coc-type-definition)
+    nmap <silent> gi <Plug>(coc-implementation)
+    nmap <silent> gr <Plug>(coc-references)
+
+    nnoremap <silent> K :call <SID>show_documentation()<CR>
+
+    function! s:show_documentation()
+        if (index(['vim','help'], &filetype) >= 0)
+            execute 'h '.expand('<cword>')
+        elseif (coc#rpc#ready())
+            call CocActionAsync('doHover')
+        else
+            execute '!' . &keywordprg . " " . expand('<cword>')
+        endif
+    endfunction
+
+    autocmd CursorHold * silent call CocActionAsync('highlight')
+
+    nmap <leader>rn <Plug>(coc-rename)
+
+    xmap <leader>f  <Plug>(coc-format-selected)
+    nmap <leader>f  <Plug>(coc-format-selected)
+
+    xmap <leader>a  <Plug>(coc-codeaction-selected)
+    nmap <leader>a  <Plug>(coc-codeaction-selected)
+    nmap <leader>ac  <Plug>(coc-codeaction)
+    nmap <leader>qf  <Plug>(coc-fix-current)
+
+    nnoremap <silent> <leader>y :<C-u>CocList -A --normal yank<CR>
+
+    let g:coc_gloabl_extensions = ['coc-clangd', 'coc-cmake', 'coc-html', 'coc-html-css-support', 'coc-java', 'coc-json', 'coc-markdownlint', 'coc-omnisharp', 'coc-prettier', 'coc-pyright', 'coc-rust-analyzer', 'coc-sh', 'coc-snippets', 'coc-xml', 'coc-yank']
+endif
+" ===
+
 " ===
 " Setup fswitch
 " ===