nvim: Enable purescript language server

This does not perform any better than purs ide and psc-ide-vim could not
jump to definitions in other components which is the same case here.
But, at least we now need one less package and additional bindings for
psc-ide-vim.

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

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

@@ -1,15 +1,2 @@
 setlocal textwidth=0
 setlocal wrapmargin=0
-
-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>p :Pursuit<CR>
-nmap <buffer> <silent> gd :Pgoto<CR>
-nmap <buffer> <silent> K  :Ptype<CR>

nvim/.config/nvim/init.vim

@@ -73,7 +73,6 @@ Plug 'ndmitchell/ghcid', { 'rtp': 'plugins/nvim' }
 Plug 'rust-lang/rust.vim', { 'for': 'rust' }
 " Purescript
 Plug 'purescript-contrib/purescript-vim'
-Plug 'frigoeu/psc-ide-vim'
 " Lisp
 Plug 'wlangstroth/vim-racket'
 Plug 'guns/vim-clojure-static'

nvim/.config/nvim/lua/lsp.lua

@@ -19,7 +19,7 @@ local on_attach = function(_, bufnr)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '<Leader>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
 end
 
-local servers = { 'ghcide', 'rust_analyzer' }
+local servers = { 'ghcide', 'purescriptls', 'rust_analyzer' }
 for _, lsp in ipairs(servers) do
   nvim_lsp[lsp].setup {
   on_attach = on_attach,

nvim/.config/nvim/plugin_settings.vim

@@ -93,8 +93,8 @@ let g:completion_chain_complete_list = {
   \    {'mode': 'keyn'}
   \],
   \ 'purescript': [
+  \    {'complete_items': ['lsp']},
   \    {'mode': 'keyn'},
-  \    {'mode': 'omni'},
   \    {'mode': '<c-p>'},
   \    {'mode': '<c-n>'}
   \],