Update 'coc' configuration

.vimrc

@@ -135,29 +135,72 @@ call plug#end()
 """""""""""""""
 
 " Coc
+
+" `neoclide/coc.nvim` {{{
 let g:coc_global_extensions = [
+  \'coc-dictionary',
+  \'coc-syntax',
   \'coc-eslint',
   \'coc-prettier',
   \'coc-tsserver',
-  \'coc-python',
   \'coc-html',
   \'coc-emmet',
   \'coc-css',
   \'coc-svg',
   \'coc-svelte',
+  \'coc-jedi',
   \'coc-json',
-  \'coc-markdownlint',
   \'coc-yaml',
   \'coc-snippets',
-  \'coc-clangd'
+  \'coc-clangd',
+  \'coc-bibtex' 
   \]
 " Autocomplete
-imap <tab> <Plug>(coc-snippets-expand)
-nn <leader>es :CocCommand snippets.editSnippets<cr>
-ino <silent><expr><c-j> pumvisible() ? "\<c-n>" :
-  \ coc#refresh()
-ino <expr><c-k> pumvisible() ? "\<C-p>" : "k"
+"
+
+" `coc-snippets`
+
+" TODO: is this block even necessary anymore?
+"
+" I use `coc-snippets-exand-jump` here as it is more flexible afaics
+" As stated in the docs:
+" `coc-snippets-expand`      Expand snippet w/ current inserted text
+" `coc-snippets-expand-jump` Expand snippet or jump to next placeholder of current snippet if possible
+
+" Use tab for expansion in every context Don't use it for jumping as
+" expansions have priority over jumping (which is not always what you want)
+"
+" E.g. You don't want to expand `time` to say `12:05` upon `<tab>`bing to go
+" from arguments to body in a function snippet
+
+inor <silent><expr> <TAB> 
+  \ coc#pum#visible() ? coc#_select_confirm() :
+  \ coc#expandable() ? "\<C-r>=coc#rpc#request('doKeymap', ['snippets-expand-jump',''])\<CR>" :
+  \ "\<TAB>"
+
+" Use <c-j> and <c-k> to move through suggestions
+" Open suggestions if not yet open
+
+inor <silent><expr> <c-j> coc#pum#visible() ? coc#pum#next(1) : coc#refresh()
+
+" NOTE: As the followning interfered with digraphs, I replaced `coc#refresh`
+" with `"\<C-g>u\<c-k>"` which afaik just does c-k when no completion menu is
+" shown
+" ```
+" inor <silent><expr> <c-k> coc#pum#visible() ? coc#pum#prev(1) : coc#refresh()
+" ```
+
+inor <silent><expr> <c-k> coc#pum#visible() ? coc#pum#prev(1) : "\<C-g>u\<c-k>"
+
+" NOTE: this is cutting text in visual mode, it is replaces `$VISUAL` on next
+" expansion
+"
+" although I mapped it, I have yet to test this feature
+
+vmap <tab> <Plug>(coc-snippets-select)
+
 ino <expr><cr> complete_info()["selected"] != "-1" ? "\<c-y>" : "\<c-g>u\<CR>"
+
 " Show doccumentation
 fu! s:show_documentation()
   if (index(['vim','help'], &filetype) >= 0)
@@ -166,13 +209,12 @@ fu! s:show_documentation()
     call CocAction('doHover')
   endif
 endfunction
-nnoremap K :call show_documentation()
+nn <leader>es :CocCommand snippets.editSnippets<cr>
 " Code action on cursor position
 nm <leader>do <Plug>(coc-codeaction)
-" Coc statusline
-se statusline^=%{coc#status()}%{get(b:,'coc_current_function','')}
-" Prettier command
+" Commands
 com! -nargs=0 Prettier :CocCommand prettier.formatFile
+" }}}
 
 " `.../copilot` {{{