From b953ccae123050337ddf66b8c80bdbdb6b9e4103 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kier=C3=A1n=20Meinhardt?= <kmein@posteo.de>
Date: Tue, 4 Jul 2023 21:44:32 +0200
Subject: [PATCH] feat(neovim): completion via cmp

---
 lib/vim/init.lua | 47 ++++++++++++++++++++++++++++++++++++++++++-----
 lib/vim/init.vim | 47 ++++++++++-------------------------------------
 packages/vim.nix | 11 ++++++++---
 3 files changed, 60 insertions(+), 45 deletions(-)

diff --git a/lib/vim/init.lua b/lib/vim/init.lua
index 2744090..af7b9dd 100644
--- a/lib/vim/init.lua
+++ b/lib/vim/init.lua
@@ -1,3 +1,39 @@
+local cmp = require'cmp'
+
+cmp.setup({
+  mapping = cmp.mapping.preset.insert({
+    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
+    ['<C-f>'] = cmp.mapping.scroll_docs(4),
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<C-e>'] = cmp.mapping.abort(),
+    ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+  }),
+  sources = cmp.config.sources({
+    { name = 'nvim_lsp' },
+  }, {
+    { name = 'buffer' },
+  })
+})
+
+-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
+cmp.setup.cmdline({ '/', '?' }, {
+  mapping = cmp.mapping.preset.cmdline(),
+  sources = {
+    { name = 'buffer' }
+  }
+})
+
+-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
+cmp.setup.cmdline(':', {
+  mapping = cmp.mapping.preset.cmdline(),
+  sources = cmp.config.sources({
+    { name = 'path' }
+  }, {
+    { name = 'cmdline' }
+  })
+})
+local capabilities = require('cmp_nvim_lsp').default_capabilities()
+
 local opts = { noremap=true, silent=true }
 vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, opts)
 vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
@@ -37,18 +73,18 @@ local lsp_flags = {
 
 language_servers = {
   pyright = {}, -- pyright
-  -- tsserver = {}, -- typescript-language-server
-  -- elmls = {}, -- elm-language-server
+  tsserver = {}, -- typescript-language-server
+  elmls = {}, -- elm-language-server
   -- denols = {}, -- deno built in
   -- bashls = {}, -- bash-language-server
   hls = {}, -- haskell-language-server
-  -- html = {}, -- vscode-langservers-extracted
-  -- jsonls = {}, -- vscode-langservers-extracted
+  html = {}, -- vscode-langservers-extracted
+  jsonls = {}, -- vscode-langservers-extracted
   nil_ls = {}, -- github:oxalica/nil
   -- rnix = {}, -- rnix-lsp
   -- jqls = {}, -- jq-lsp
   rust_analyzer = { ["rust-analyzer"] = {} },
-  -- eslint?
+  eslint = {},
   -- volar? vls?
   texlab = {
     texlab = {
@@ -82,5 +118,6 @@ for server, settings in pairs(language_servers) do
     on_attach = on_attach,
     flags = lsp_flags,
     settings = settings,
+    capabilities = capabilities
   }
 end
diff --git a/lib/vim/init.vim b/lib/vim/init.vim
index 25f3fcb..7ce9203 100644
--- a/lib/vim/init.vim
+++ b/lib/vim/init.vim
@@ -30,10 +30,6 @@ noremap <leader>i mzgg=G`z
 " replace all
 nnoremap S :%s//g<Left><Left>
 
-nnoremap <Leader>a <Plug>(ale_hover)
-nnoremap <Leader>d <Plug>(ale_go_to_definition_in_tab)
-nnoremap <Leader>rf <Plug>(ale_find_references)
-
 " Hit `%` on `if` to jump to `else`.
 runtime macros/matchit.vim
 
@@ -67,6 +63,16 @@ set foldlevelstart=30
 iabbrev ddate <C-R>=strftime("%F")<CR>
 iabbrev dtime <C-R>=strftime("%F %T")<CR>
 
+fun! TrimWhitespace()
+  let l:save = winsaveview()
+  keeppatterns %s/\s\+$//e
+  call winrestview(l:save)
+endfun
+command! TrimWhitespace call TrimWhitespace()
+autocmd BufWritePre * if !&binary && &ft !=# 'mail'
+      \|   call TrimWhitespace()
+      \| endif
+
 let g:netrw_banner=0
 let g:netrw_browse_split=4
 let g:netrw_altv=1 " open splits to the right
@@ -152,8 +158,6 @@ autocmd bufreadpre * setlocal foldmethod=indent
 set completeopt=noinsert,menuone,noselect
 set complete+=kspell
 
-let g:SuperTabDefaultCompletionType = 'context'
-
 let g:haskell_enable_quantification = 1
 let g:haskell_enable_recursivedo = 1
 let g:haskell_enable_arrowsyntax = 1
@@ -162,34 +166,3 @@ let g:haskell_enable_pattern_synonyms = 1
 let g:pandoc#syntax#conceal#use = 0
 let g:pandoc#modules#disabled = []
 let g:pandoc#spell#default_langs = ['en', 'de']
-
-let g:ale_linters = {
-      \ 'css': ['csslint'],
-      \ 'haskell': ['ghc', 'cabal-ghc', 'hlint', 'ormolu'],
-      \ 'html': ['tidy', 'proselint'],
-      \ 'latex': ['lacheck', 'chktex', 'proselint'],
-      \ 'pandoc': ['proselint'],
-      \ 'ruby': ['rubocop'],
-      \ 'json': ['jsonlint'],
-      \ 'rust': ['cargo'],
-      \ 'python': ['pyls'],
-      \}
-let g:ale_fixers = {
-      \ '*': ['remove_trailing_lines', 'trim_whitespace'],
-      \ 'javascript': ['prettier'],
-      \ 'typescript': ['prettier'],
-      \ 'css': ['prettier'],
-      \ 'html': ['prettier'],
-      \ 'json': ['jq'],
-      \ 'python': ['black'],
-      \ 'rust': ['rustfmt']
-      \}
-let g:ale_set_quickfix = 1
-
-let g:ale_fix_on_save = 1
-autocmd bufnewfile,bufread elm.json let g:ale_fix_on_save = 0
-
-let g:ale_completion_enabled = 1
-
-let g:vimwiki_list = [{'path': '~/notes/',
-      \ 'syntax': 'markdown', 'ext': '.md'}]
diff --git a/packages/vim.nix b/packages/vim.nix
index 316309a..6ddb5a3 100644
--- a/packages/vim.nix
+++ b/packages/vim.nix
@@ -8,13 +8,18 @@
 }: (neovim.override {
   configure = {
     customRC = ''
-      source ${../lib/vim/init.vim}
-
       luafile ${../lib/vim/init.lua}
+
+      source ${../lib/vim/init.vim}
     '';
     packages.nvim = with vimPlugins; {
       start = [
-        ale
+        nvim-cmp
+        cmp-buffer
+        cmp-path
+        cmp-nvim-lsp
+        cmp-cmdline
+
         fzf-vim
         fzfWrapper
         supertab