nvim: LSP cleanup and refactor

LSP does not work all the time. Either client breaks, server breaks or
it does not work because of the project structure. Removing LSP for the
umpteenth time.

asyncomplete does not seem to work at all for tags. For example, in the
gst-build directory the generated tags file can be 200MB+ in size. Even
with the file size limit set to unlimited it does not seem to give any
tag suggestions at all. Same is the case for Haskell.

Mucomplete can be slow in such cases where tag file is very large or
search space is extensively large and being synchronous this is to be
expected. To alleviate this, it is necessary to have a minimum prefix
length of 2 and perhaps trigger completion only when required. However,
this was still not good enough.

We are back to deoplete with custom source configuration. It is pretty
clear vimscript solutions are not up to the mark. Enable python provider
and also reintroduce language specific solutions like racer and jedi.

Refactor out language/file type specific settings. init.vim should only
have global keybindings, plugins and plugin settings. Also some other
minor cleanups, additions and rearrangements.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/after/ftplugin/c.vim

@@ -0,0 +1,15 @@
+nmap <LocalLeader>ct :NeomakeSh ctags -R .<CR>
+nmap <LocalLeader>cu :NeomakeSh cscope -bqR<CR>
+nmap <LocalLeader>cr :cs reset<CR>
+
+nmap <silent> <LocalLeader>s  <Plug>(quickr_cscope_symbols)
+nmap <silent> <LocalLeader>g  <Plug>(quickr_cscope_global)
+nmap <silent> <LocalLeader>h  <Plug>(quickr_cscope_global_split)
+nmap <silent> <LocalLeader>v  <Plug>(quickr_cscope_global_vert_split)
+nmap <silent> <LocalLeader>d  <Plug>(quickr_cscope_functions)
+nmap <silent> <LocalLeader>c  <Plug>(quickr_cscope_callers)
+nmap <silent> <LocalLeader>t  <Plug>(quickr_cscope_text)
+nmap <silent> <LocalLeader>e  <Plug>(quickr_cscope_egrep)
+nmap <silent> <LocalLeader>f  <Plug>(quickr_cscope_files)
+nmap <silent> <LocalLeader>i  <Plug>(quickr_cscope_includes)
+nmap <silent> <LocalLeader>a  <Plug>(quickr_cscope_assignments)

nvim/.config/nvim/after/ftplugin/cpp.vim

@@ -0,0 +1,6 @@
+let g:cpp_class_scope_highlight = 1
+let g:cpp_member_variable_highlight = 1
+let g:cpp_class_decl_highlight = 1
+let g:cpp_posix_standard = 1
+let g:cpp_concepts_highlight = 1
+

nvim/.config/nvim/after/ftplugin/gitcommit.vim

@@ -0,0 +1 @@
+setlocal spell textwidth=72

nvim/.config/nvim/after/ftplugin/haskell.vim

@@ -0,0 +1,82 @@
+" https://www.reddit.com/r/neovim/comments/es8wn7/haskell_makeprg_for_stack_build/
+" https://github.com/maxigit/vimrc/tree/2020/compiler
+compiler stack
+setlocal makeprg=stack\ build
+setlocal keywordprg=:Hoogle
+nmap <LocalLeader>b  :Neomake!<CR>
+nmap <LocalLeader>t  :NeomakeSh stack exec -- hasktags -x -c .<CR>
+nmap <LocalLeader>td :NeomakeSh stack exec -- haskdogs<CR>
+nmap <LocalLeader>g  :Ghcid<CR>
+nmap <LocalLeader>k  :GhcidKill<CR>
+nmap <LocalLeader>c  :HoogleClose<CR>
+nmap <LocalLeader>o  :exe ':Hoogle ' . expand('<cword>')<CR>
+nmap <LocalLeader>i  :exe ':HoogleInfo ' . expand('<cword>')<CR>
+
+" Tabular helpers
+vnoremap <Leader>= :Tabularize /=<CR>
+vnoremap <Leader>- :Tabularize /-><CR>
+vnoremap <Leader>< :Tabularize /<-<CR>
+vnoremap <Leader>, :Tabularize /,<CR>
+vnoremap <Leader># :Tabularize /#-}<CR>
+vnoremap <Leader>: :Tabularize /::<CR>
+vnoremap <Leader>[ :Tabularize /[<CR>
+
+nmap <buffer><silent> ]] :call JumpHaskellFunction(0)<CR>
+nmap <buffer><silent> [[ :call JumpHaskellFunction(1)<CR>
+imap <buffer> ;; <ESC>:call MakeArrow(1)<CR>
+imap <buffer> ;: <ESC>:call MakeArrow(0)<CR>
+
+let g:haskell_enable_quantification = 1   " to enable highlighting of `forall`
+let g:haskell_enable_recursivedo = 1      " to enable highlighting of `mdo` and `rec`
+let g:haskell_enable_arrowsyntax = 1      " to enable highlighting of `proc`
+let g:haskell_enable_pattern_synonyms = 1 " to enable highlighting of `pattern`
+let g:haskell_enable_typeroles = 1        " to enable highlighting of type roles
+let g:haskell_enable_static_pointers = 1  " to enable highlighting of `static`
+let g:haskell_backpack = 1                " to enable highlighting of backpack keywords
+
+let g:haskell_classic_highlighting = 0
+let g:haskell_indent_if = 3
+let g:haskell_indent_case = 2
+let g:haskell_indent_let = 4
+let g:haskell_indent_where = 6
+let g:haskell_indent_before_where = 2
+let g:haskell_indent_after_bare_where = 2
+let g:haskell_indent_do = 3
+let g:haskell_indent_in = 1
+let g:haskell_indent_guard = 2
+let g:haskell_indent_case_alternative = 1
+let g:cabal_indent_section = 2
+" Either check empty($IN_NIX_SHELL) for nix specific or executable('ghcid')
+if executable('ghcid')
+  let g:ghcid_command = 'ghcid'
+else
+  let g:ghcid_command = 'stack exec -- ghcid'
+endif
+if executable('hoogle')
+  let g:hoogle_search_bin = 'hoogle'
+else
+  let g:hoogle_search_bin = 'stack exec -- hoogle'
+endif
+let g:hoogle_search_count = 30
+
+function! JumpHaskellFunction(reverse)
+  call search('\C[[:alnum:]]*\s*::', a:reverse ? 'bW' : 'W')
+endfunction
+
+function! MakeArrow(type)
+  if a:type
+    if (matchstr(getline('.'), '\%' . col('.') . 'c.') ==? ' ')
+      exe "norm! a->  "
+    else
+      exe "norm! a ->  "
+    endif
+    exe "startreplace"
+  else
+    if (matchstr(getline('.'), '\%' . col('.') . 'c.') ==? ' ')
+      exe "norm! a=>  "
+    else
+      exe "norm! a =>  "
+    endif
+    exe "startreplace"
+  endif
+endfunction

nvim/.config/nvim/after/ftplugin/markdown.vim

@@ -0,0 +1 @@
+setlocal spell

nvim/.config/nvim/after/ftplugin/purescript.vim

@@ -0,0 +1,12 @@
+nmap <buffer> <silent> <LocalLeader>L :Plist<CR>
+nmap <buffer> <silent> <LocalLeader>l :Pload<CR>
+nmap <buffer> <silent> <LocalLeader>r :Prebuild<CR>
+nmap <buffer> <silent> <LocalLeader>f :PaddClause<CR>
+nmap <buffer> <silent> <LocalLeader>T :PaddType<CR>
+nmap <buffer> <silent> <LocalLeader>a :Papply<CR>
+nmap <buffer> <silent> <LocalLeader>c :Pcase<CR>
+nmap <buffer> <silent> <LocalLeader>i :Pimport<CR>
+nmap <buffer> <silent> <LocalLeader>q :PaddImportQualifications<CR>
+nmap <buffer> <silent> <LocalLeader>g :Pgoto<CR>
+nmap <buffer> <silent> <LocalLeader>p :Pursuit<CR>
+nmap <buffer> <silent> <LocalLeader>t :Ptype<CR>

nvim/.config/nvim/after/ftplugin/python.vim

@@ -0,0 +1,22 @@
+" Python Jedi
+let g:jedi#goto_command = "gt"
+let g:jedi#goto_assignments_command = "ga"
+let g:jedi#goto_definitions_command = "gd"
+let g:jedi#documentation_command = "K"
+let g:jedi#usages_command = "gx"
+let g:jedi#completions_command = "<Tab>"
+let g:jedi#rename_command = "gr"
+
+let g:jedi#auto_initialization = 1
+let g:jedi#auto_vim_configuration = 0
+let g:jedi#use_tabs_not_buffers = 1
+let g:jedi#popup_on_dot = 1
+let g:jedi#popup_select_first = 0
+let g:jedi#smart_auto_mappings = 0
+let g:jedi#show_call_signatures = "2"
+let g:jedi#show_call_signatures_delay = 0
+let g:jedi#show_call_signatures_modes = 'i'
+let g:jedi#enable_speed_debugging = 0
+let g:jedi#completions_enabled = 0
+
+

nvim/.config/nvim/after/ftplugin/qf.vim

@@ -0,0 +1,2 @@
+noremap <silent><buffer> p :call quickui#tools#preview_quickfix()<CR>
+

nvim/.config/nvim/after/ftplugin/rust.vim

@@ -0,0 +1,19 @@
+nmap <buffer> gd <Plug>DeopleteRustGoToDefinitionDefault
+nmap <buffer> K  <Plug>DeopleteRustShowDocumentation
+nmap <buffer> gv <Plug>DeopleteRustGoToDefinitionVSplit
+nmap <buffer> gh <Plug>DeopleteRustGoToDefinitionSplit
+nmap <buffer> gt <Plug>DeopleteRustGoToDefinitionTab
+
+augroup rust_maps
+  au!
+  " Taken from http://seenaburns.com/vim-setup-for-rust/
+  " Neomake
+  " Gross hack to stop Neomake running when exitting because it creates a zombie cargo check process
+  " which holds the lock and never exits. But then, if you only have QuitPre, closing one pane will
+  " disable neomake, so BufEnter reenables when you enter another buffer.
+  let s:quitting = 0
+  au FileType rust au QuitPre let s:quitting = 1
+  au FileType rust au BufEnter let s:quitting = 0
+  au FileType rust au BufWritePost if ! s:quitting | Neomake | else | echom "Neomake disabled" | endif
+augroup END
+

nvim/.config/nvim/after/ftplugin/text.vim

@@ -0,0 +1 @@
+setlocal spell

nvim/.config/nvim/after/ftplugin/vim.vim

@@ -0,0 +1,4 @@
+nmap pg :PlugUpgrade<CR>
+nmap pd :PlugUpdate<CR>
+nmap pw :PlugClean<CR>
+nmap pr :so %<CR>

nvim/.config/nvim/init.vim

@@ -10,8 +10,6 @@ Plug 'haya14busa/incsearch.vim'
 Plug 'haya14busa/incsearch-easymotion.vim'
 " Fuzzy search
 Plug 'junegunn/fzf.vim'
-Plug 'pbogut/fzf-mru.vim'
-Plug 'fszymanski/fzf-quickfix', {'on': 'Quickfix'}
 " Remove extraneous whitespace when edit mode is exited
 Plug 'axelf4/vim-strip-trailing-whitespace'
 " Status bar mods
@@ -41,31 +39,37 @@ Plug 'rbong/vim-flog'
 Plug 'samoshkin/vim-mergetool'
 " Git diffs in quickfix list
 Plug 'oguzbilgic/vim-gdiff'
-" For tmux yank
+" Boost vim command line mode
 Plug 'vim-utils/vim-husk'
 " GDB
 Plug 'sakhnik/nvim-gdb', { 'do': ':UpdateRemotePlugins' }
-" Lisp
-Plug 'guns/vim-sexp', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
-Plug 'tpope/vim-sexp-mappings-for-regular-people', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
-Plug 'junegunn/rainbow_parentheses.vim', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
-Plug 'kovisoft/slimv', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
 " Haskell
 Plug 'ndmitchell/ghcid', { 'rtp': 'plugins/nvim' }
 Plug 'Twinside/vim-hoogle', { 'for': 'haskell' }
 Plug 'hspec/hspec.vim'
 Plug 'pbrisbin/vim-syntax-shakespeare'
 Plug 'zenzike/vim-haskell-unicode', { 'for': 'haskell' }
-Plug 'godlygeek/tabular'
+Plug 'godlygeek/tabular', { 'for': 'haskell' }
-" For autocompletion
+Plug 'Twinside/vim-haskellFold'
-Plug 'prabirshrestha/asyncomplete.vim'
+" Purescript
-Plug 'prabirshrestha/asyncomplete-buffer.vim'
+Plug 'frigoeu/psc-ide-vim', { 'for': 'purescript' }
-Plug 'prabirshrestha/asyncomplete-file.vim'
-Plug 'prabirshrestha/asyncomplete-tags.vim'
 " Erlang Support
 Plug 'vim-erlang/vim-erlang-tags', { 'for': 'erlang' }
 Plug 'vim-erlang/vim-erlang-omnicomplete', { 'for': 'erlang' }
 Plug 'vim-erlang/vim-erlang-compiler', { 'for': 'erlang' }
+" Lisp
+Plug 'guns/vim-sexp', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
+Plug 'tpope/vim-sexp-mappings-for-regular-people', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
+Plug 'junegunn/rainbow_parentheses.vim', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
+Plug 'kovisoft/slimv', { 'for': [ 'scheme', 'lisp', 'clojure' ] }
+" Python
+Plug 'davidhalter/jedi-vim', { 'for': 'python' }
+" For autocompletion
+Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
+Plug 'deoplete-plugins/deoplete-jedi', { 'for': 'python' }
+Plug 'sebastianmarkow/deoplete-rust', { 'for': 'rust' }
+Plug 'Shougo/neco-syntax'
+Plug 'deoplete-plugins/deoplete-tag'
 " Neo/Async stuff
 Plug 'sbdchd/neoformat'
 Plug 'neomake/neomake'
@@ -93,13 +97,6 @@ Plug 'tpope/vim-eunuch'
 Plug 'tpope/vim-sleuth'
 Plug 'tpope/vim-vinegar'
 Plug 'Yggdroot/indentLine'
-" LSP related
-Plug 'liuchengxu/vista.vim'
-Plug 'prabirshrestha/async.vim'
-Plug 'prabirshrestha/vim-lsp'
-Plug 'prabirshrestha/asyncomplete-lsp.vim'
-" Search and Replace
-Plug 'brooth/far.vim'
 " Floating terminal
 Plug 'voldikss/vim-floaterm'
 " Language agnostic
@@ -114,8 +111,6 @@ Plug 'wsdjeg/vim-fetch'
 " Miscellaneous
 Plug 'junegunn/vim-slash'
 Plug 'andymass/vim-matchup'
-Plug 'editorconfig/editorconfig-vim'
-Plug 'igankevich/mesonic'
 Plug 'liuchengxu/vim-which-key'
 Plug 'farmergreg/vim-lastplace'
 
@@ -154,7 +149,7 @@ set noswapfile          " no swap files
 set foldmethod=syntax   " Create folds based on files syntax
 set nofoldenable        " Open folds by default
 set undofile            " Enable undo persistence across sessions
-set hidden              " Required by LC
+set hidden
 set noautochdir
 
 " Wild menu
@@ -193,6 +188,7 @@ set completeopt=menu,noselect,preview,noinsert
 " Required for vim-workspace
 " See https://github.com/thaerkh/vim-workspace/issues/11
 set sessionoptions-=blank
+set grepprg=rg\ --vimgrep
 
 " Theme
 let g:sonokai_style = 'atlantis'
@@ -227,7 +223,6 @@ nnoremap <Leader>fH  :History/<CR>
 nnoremap <Leader>fm  :Commands<CR>
 nnoremap <Leader>fo  :Locate<SPACE>
 nnoremap <Leader>fk  :Maps<CR>
-nnoremap <Leader>fr  :FZFMru<CR>
 nnoremap <Leader>f/  :Rg<CR>
 nnoremap <Leader>fs  :exe ':Rg ' . expand('<cword>')<CR>
 imap <C-x><C-w> <plug>(fzf-complete-word)
@@ -308,7 +303,6 @@ nnoremap ]Q :clast<CR>
 nnoremap qs :Grepper -nojump -query<SPACE>
 nnoremap q* :Grepper -nojump -cword<CR>
 nnoremap qt :call ToggleQuickfixList()<CR>
-nnoremap qf :Quickfix<CR>
 nnoremap Lo :lopen<CR>
 nnoremap Lc :lclose<CR>
 nnoremap [l :lprevious<CR>
@@ -317,7 +311,6 @@ nnoremap [L :lfirst<CR>
 nnoremap ]L :llast<CR>
 nnoremap Ls :Grepper -nojump -noquickfix -query<SPACE>
 nnoremap L* :Grepper -nojump -noquickfix -cword<CR>
-nnoremap Lf :Quickfix!<CR>
 nnoremap Lt :call ToggleLocationList()<CR>
 " Preview tags
 nnoremap pt :ptag <C-R><C-W><CR>
@@ -378,15 +371,6 @@ noremap <silent><expr> g/ incsearch#go(<SID>incsearch_config({'is_stay': 1}))
 nnoremap <C-\> :vsp <CR>:exec("tag ".expand("<cword>"))<CR>
 nnoremap <A-]> :sp <CR>:exec("tag ".expand("<cword>"))<CR>
 
-" Tabular helpers
-vnoremap <Leader>= :Tabularize /=<CR>
-vnoremap <Leader>- :Tabularize /-><CR>
-vnoremap <Leader>< :Tabularize /<-<CR>
-vnoremap <Leader>, :Tabularize /,<CR>
-vnoremap <Leader># :Tabularize /#-}<CR>
-vnoremap <Leader>: :Tabularize /::<CR>
-vnoremap <Leader>[ :Tabularize /[<CR>
-
 " Any jump
 nnoremap <Leader>aj :AnyJump<CR>
 nnoremap <Leader>ab :AnyJumpBack<CR>
@@ -403,86 +387,11 @@ command! -bang -nargs=* GGrep
       \   fzf#vim#with_preview({'dir': systemlist('git rev-parse --show-toplevel')[0]}), <bang>0)
 
 " --------------------------- Autocmd groups ---------------------------------
-
-augroup QuickfixPreview
-  au!
-  au FileType qf noremap <silent><buffer> p :call quickui#tools#preview_quickfix()<CR>
-augroup END
-
-augroup vimplug_maps
-  au!
-  au FileType vim nmap pg :PlugUpgrade<CR>
-  au FileType vim nmap pd :PlugUpdate<CR>
-  au FileType vim nmap pc :PlugClean<CR>
-  au FileType vim nmap pr :so %<CR>
-augroup END
-
-augroup haskell_maps
-  au!
-  " https://www.reddit.com/r/neovim/comments/es8wn7/haskell_makeprg_for_stack_build/
-  " https://github.com/maxigit/vimrc/tree/2020/compiler
-  au FileType haskell compiler stack
-  au FileType haskell setlocal makeprg=stack\ build
-  au FileType haskell setlocal keywordprg=:Hoogle
-  au FileType haskell nmap <LocalLeader>b  :Neomake!<CR>
-  au FileType haskell nmap <LocalLeader>t  :NeomakeSh stack exec -- hasktags -x -c .<CR>
-  au FileType haskell nmap <LocalLeader>td :NeomakeSh stack exec -- haskdogs<CR>
-  au FileType haskell nmap <LocalLeader>g  :Ghcid<CR>
-  au FileType haskell nmap <LocalLeader>k  :GhcidKill<CR>
-  au FileType haskell nmap <LocalLeader>c  :HoogleClose<CR>
-  au FileType haskell nmap <LocalLeader>o  :exe ':Hoogle ' . expand('<cword>')<CR>
-  au FileType haskell nmap <LocalLeader>i  :exe ':HoogleInfo ' . expand('<cword>')<CR>
-
-  au FileType haskell nnoremap <buffer><silent> ]] :call JumpHaskellFunction(0)<CR>
-  au FileType haskell nnoremap <buffer><silent> [[ :call JumpHaskellFunction(1)<CR>
-  au FileType haskell inoremap <buffer> ;; <ESC>:call MakeArrow(1)<CR>
-  au FileType haskell inoremap <buffer> ;: <ESC>:call MakeArrow(0)<CR>
-augroup END
-
-augroup c_maps
-  au!
-  au FileType c nmap <LocalLeader>ct :NeomakeSh ctags -R .<CR>
-  au FileType c nmap <LocalLeader>cu :NeomakeSh cscope -bqR<CR>
-  au FileType c nmap <LocalLeader>cr :cs reset<CR>
-
-  au FileType c nmap <silent> <LocalLeader>s  <Plug>(quickr_cscope_symbols)
-  au FileType c nmap <silent> <LocalLeader>g  <Plug>(quickr_cscope_global)
-  au FileType c nmap <silent> <LocalLeader>h  <Plug>(quickr_cscope_global_split)
-  au FileType c nmap <silent> <LocalLeader>v  <Plug>(quickr_cscope_global_vert_split)
-  au FileType c nmap <silent> <LocalLeader>d  <Plug>(quickr_cscope_functions)
-  au FileType c nmap <silent> <LocalLeader>c  <Plug>(quickr_cscope_callers)
-  au FileType c nmap <silent> <LocalLeader>t  <Plug>(quickr_cscope_text)
-  au FileType c nmap <silent> <LocalLeader>e  <Plug>(quickr_cscope_egrep)
-  au FileType c nmap <silent> <LocalLeader>f  <Plug>(quickr_cscope_files)
-  au FileType c nmap <silent> <LocalLeader>i  <Plug>(quickr_cscope_includes)
-  au FileType c nmap <silent> <LocalLeader>a  <Plug>(quickr_cscope_assignments)
-augroup END
-
-augroup rust_maps
-  au!
-  " Taken from http://seenaburns.com/vim-setup-for-rust/
-  " Neomake
-  " Gross hack to stop Neomake running when exitting because it creates a zombie cargo check process
-  " which holds the lock and never exits. But then, if you only have QuitPre, closing one pane will
-  " disable neomake, so BufEnter reenables when you enter another buffer.
-  let s:quitting = 0
-  au FileType rust au QuitPre let s:quitting = 1
-  au FileType rust au BufEnter let s:quitting = 0
-  au FileType rust au BufWritePost if ! s:quitting | Neomake | else | echom "Neomake disabled" | endif
-augroup END
-
 augroup rainbow_lisp
   autocmd!
   autocmd FileType lisp,clojure,scheme RainbowParentheses
 augroup END
 
-" Toggles search highlighting off/on according to current mode. Source: http://blog.sanctum.geek.nz/vim-search-highlighting/
-augroup toggle_search
-  autocmd!
-  autocmd InsertEnter * setlocal nohlsearch
-  autocmd InsertLeave * setlocal hlsearch
-augroup END
-
 augroup quickfix
   au!
   " Close QF window if it is last window
@@ -499,116 +408,12 @@ augroup terminal_job
   au TermOpen * setlocal listchars= nonumber norelativenumber
 augroup END
 
-augroup spell_check
-  au!
-  autocmd FileType gitcommit setlocal spell textwidth=72
-  autocmd BufRead,BufNewFile *.md,*.txt setlocal spell
-augroup END
-
 augroup ResizeWindowsProportionally
   au!
   autocmd VimResized * :wincmd =
 augroup END
 
-augroup LSP
-  au!
-  nnoremap <LocalLeader>le :call lsp#enable()<CR>
-  nnoremap <LocalLeader>ld :call lsp#disable()<CR>
-  nnoremap <LocalLeader>lh :LspStopServer()<CR>
-  nnoremap <LocalLeader>ls :LspStatus<CR>
-  au User lsp_server_init call s:on_lsp_server_init()
-augroup END
-
-augroup VimLspSettings
-  au!
-    if executable('pyls')
-        au User lsp_setup call lsp#register_server({
-            \ 'name': 'pyls',
-            \ 'cmd': {server_info->['pyls']},
-            \ 'whitelist': ['python'],
-            \ })
-    endif
-    if executable('ra_lsp_server')
-        au User lsp_setup call lsp#register_server({
-            \ 'name': 'ra_lsp_server',
-            \ 'cmd': {server_info->['ra_lsp_server']},
-            \ 'whitelist': ['rust'],
-            \ })
-    endif
-    if executable('purescript-language-server')
-        au User lsp_setup call lsp#register_server({
-            \ 'name': 'purescript-language-server',
-            \ 'cmd': {server_info->['purescript-language-server', '--stdio']},
-            \ 'whitelist': ['purescript'],
-            \ })
-    endif
-    if executable('ghcide')
-        au User lsp_setup call lsp#register_server({
-            \ 'name': 'ghcide',
-            \ 'cmd': {server_info->['ghcide', '--lsp']},
-            \ 'whitelist': ['haskell'],
-            \ })
-    endif
-augroup END
-
-augroup AsyncCompleteSetup
-  au!
-    au User asyncomplete_setup call asyncomplete#register_source(asyncomplete#sources#tags#get_source_options({
-      \ 'name': 'tags',
-      \ 'whitelist': ['c', 'haskell'],
-      \ 'completor': function('asyncomplete#sources#tags#completor'),
-      \ }))
-   au User asyncomplete_setup call asyncomplete#register_source(asyncomplete#sources#buffer#get_source_options({
-      \ 'name': 'buffer',
-      \ 'whitelist': ['*'],
-      \ 'blacklist': ['go'],
-      \ 'completor': function('asyncomplete#sources#buffer#completor'),
-      \ 'config': {
-      \    'max_buffer_size': 5000000,
-      \  },
-      \ }))
-   au User asyncomplete_setup call asyncomplete#register_source(asyncomplete#sources#file#get_source_options({
-      \ 'name': 'file',
-      \ 'whitelist': ['*'],
-      \ 'priority': 10,
-      \ 'completor': function('asyncomplete#sources#file#completor')
-      \ }))
-augroup END
-
 " --------------------------- Plugin settings --------------------------------
-let g:haskell_enable_quantification = 1   " to enable highlighting of `forall`
-let g:haskell_enable_recursivedo = 1      " to enable highlighting of `mdo` and `rec`
-let g:haskell_enable_arrowsyntax = 1      " to enable highlighting of `proc`
-let g:haskell_enable_pattern_synonyms = 1 " to enable highlighting of `pattern`
-let g:haskell_enable_typeroles = 1        " to enable highlighting of type roles
-let g:haskell_enable_static_pointers = 1  " to enable highlighting of `static`
-let g:haskell_backpack = 1                " to enable highlighting of backpack keywords
-
-let g:haskell_classic_highlighting = 0
-let g:haskell_indent_if = 3
-let g:haskell_indent_case = 2
-let g:haskell_indent_let = 4
-let g:haskell_indent_where = 6
-let g:haskell_indent_before_where = 2
-let g:haskell_indent_after_bare_where = 2
-let g:haskell_indent_do = 3
-let g:haskell_indent_in = 1
-let g:haskell_indent_guard = 2
-let g:haskell_indent_case_alternative = 1
-let g:cabal_indent_section = 2
-" Either check empty($IN_NIX_SHELL) for nix specific or executable('ghcid')
-if executable('ghcid')
-  let g:ghcid_command = 'ghcid'
-else
-  let g:ghcid_command = 'stack exec -- ghcid'
-endif
-if executable('hoogle')
-  let g:hoogle_search_bin = 'hoogle'
-else
-  let g:hoogle_search_bin = 'stack exec -- hoogle'
-endif
-let g:hoogle_search_count = 30
-
 " Use airline
 let g:airline#extensions#tabline#enabled = 1
 let g:airline#extensions#tabline#fnamemod = ':t'
@@ -674,12 +479,6 @@ let g:mapleader = "\<Space>"
 let g:maplocalleader = ','
 let g:which_key_use_floating_win = 1
 
-let g:cpp_class_scope_highlight = 1
-let g:cpp_member_variable_highlight = 1
-let g:cpp_class_decl_highlight = 1
-let g:cpp_posix_standard = 1
-let g:cpp_concepts_highlight = 1
-
 " For SLIMV
 let g:lisp_rainbow=1
 
@@ -688,37 +487,15 @@ let g:fzf_mru_no_sort = 1
 let $FZF_DEFAULT_OPTS='--layout=reverse'
 let g:fzf_layout = { 'window': { 'width': 0.8, 'height': 0.6 } }
 
-" Quickr
-let g:quickr_cscope_keymaps = 0
-
-" LSP
-let g:lsp_diagnostics_enabled = 1
-let g:lsp_signs_enabled = 1
-let g:lsp_diagnostics_echo_cursor = 1
-let g:lsp_highlight_references_enabled = 1
-let g:lsp_auto_enable = 0
-
-" Vista
-let g:vista_executive_for = {
-      \ 'c': 'ctags',
-      \ 'haskell': 'vim_lsp',
-      \ 'rust': 'vim_lsp',
-      \ 'purescript': 'vim_lsp',
-      \ 'python': 'vim_lsp',
-      \ }
-let g:vista_ctags_cmd = {
-      \ 'haskell': 'stack exec -- hasktags -x -o - -c .',
-      \ }
-
 " Allow nightfly theme to set indentline colors
 let g:indentLine_setColors = 0
 
 " Disable providers we do not give a shit about
 let g:loaded_python_provider = 0
-let g:loaded_python3_provider = 0
 let g:loaded_ruby_provider = 0
 let g:loaded_perl_provider = 0
 let g:loaded_node_provider = 0
+let g:python3_host_prog = '/usr/bin/python3'
 
 " Mergetool
 let g:mergetool_layout = 'mr'
@@ -746,6 +523,32 @@ let g:grepper.switch        = 0
 let g:grepper.append        = 0
 let g:grepper.prompt        = 0
 
+" Deoplete
+let g:deoplete#enable_at_startup = 1
+let g:deoplete#sources#rust#disable_keymap = 1
+let g:deoplete#sources#rust#racer_binary=expand('$HOME/.cargo/bin/racer')
+let g:deoplete#sources#rust#rust_source_path=expand('$HOME/GitSources/rust/src')
+let g:deoplete#sources = {}
+call deoplete#custom#source('_', 'disabled_syntaxes', ['Comment', 'String'])
+call deoplete#custom#option('sources', {
+      \ '_' : ['buffer', 'omni', 'around', 'file', 'member'],
+      \ 'haskell': ['tag', 'buffer', 'omni'],
+      \ 'c': ['tag', 'buffer'],
+      \ 'purescript': ['buffer', 'omni'],
+      \ 'rust': ['racer', 'buffer'],
+      \})
+call deoplete#custom#source('omni', 'functions', {
+      \ 'purescript':  'PSCIDEComplete',
+      \})
+call deoplete#custom#var('omni', 'input_patterns', {
+      \ 'purescript': '\w*',
+      \})
+call deoplete#custom#option({
+      \ 'auto_complete_delay': 200,
+      \ 'auto_complete': v:true,
+      \ 'smart_case': v:true,
+      \ })
+
 " ----------------------------- Functions ------------------------------------
 function! NvimGdbNoTKeymaps()
   tnoremap <silent> <buffer> <Esc> <C-\><C-n>
@@ -760,56 +563,3 @@ function! s:incsearch_config(...) abort
 	\   'is_expr': 0
 	\ }), get(a:, 1, {}))
 endfunction
-
-function! JumpHaskellFunction(reverse)
-  call search('\C[[:alnum:]]*\s*::', a:reverse ? 'bW' : 'W')
-endfunction
-
-function! MakeArrow(type)
-  if a:type
-    if (matchstr(getline('.'), '\%' . col('.') . 'c.') ==? ' ')
-      exe "norm! a->  "
-    else
-      exe "norm! a ->  "
-    endif
-    exe "startreplace"
-  else
-    if (matchstr(getline('.'), '\%' . col('.') . 'c.') ==? ' ')
-      exe "norm! a=>  "
-    else
-      exe "norm! a =>  "
-    endif
-    exe "startreplace"
-  endif
-endfunction
-
-function! s:on_lsp_server_init() abort
-  setlocal omnifunc=lsp#complete
-  setlocal signcolumn=yes
-
-  " Always expected to work
-  nmap <buffer> gd  :LspDefinition<CR>
-  nmap <buffer> gpd :LspPeekDefinition<CR>
-  nmap <buffer> gk  :LspHover<CR>
-
-  " May or may not be available depending on language server
-  nmap <buffer> gx :LspReferences<CR>
-  nmap <buffer> gr :LspRename<CR>
-  nmap <buffer> <LocalLeader>ca :LspCodeAction<CR>
-  nmap <buffer> <LocalLeader>dd :LspDocumentDiagnostics<CR>
-  nmap <buffer> <LocalLeader>df :LspDocumentFormat<CR>
-  nmap <buffer> <LocalLeader>rf :LspDocumentRangeFormat<CR>
-  nmap <buffer> <LocalLeader>ds :LspDocumentSymbol<CR>
-  nmap <buffer> <LocalLeader>di :LspImplementation<CR>
-  nmap <buffer> <LocalLeader>nd :LspNextDiagnostic<CR>
-  nmap <buffer> <LocalLeader>pd :LspPreviousDiagnostic<CR>
-  nmap <buffer> <LocalLeader>ne :LspNextError<CR>
-  nmap <buffer> <LocalLeader>pe :LspPreviousError<CR>
-  nmap <buffer> <LocalLeader>nr :LspNextReference<CR>
-  nmap <buffer> <LocalLeader>pr :LspPreviousReference<CR>
-  nmap <buffer> <LocalLeader>nw :LspNextWarning<CR>
-  nmap <buffer> <LocalLeader>pw :LspPreviousWarning<CR>
-  nmap <buffer> <LocalLeader>dt :LspTypeDefinition<CR>
-  nmap <buffer> <LocalLeader>td :LspPeekTypeDefinition<CR>
-  nmap <buffer> <LocalLeader>pi :LspPeekImplementation<CR>
-endfunction