nvim: Switch to using Language Client Server Protocol

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

nvim/init.vim

@@ -33,13 +33,13 @@ Plug 'universal-ctags/ctags'
 Plug 'scrooloose/nerdcommenter'
 " Theme
 Plug 'sickill/vim-monokai'
+" Language Client
+Plug 'autozimu/LanguageClient-neovim', {
+    \ 'branch': 'next',
+    \ 'do': 'fish install.sh',
+    \ }
 " Auto Completion with Deoplete
 Plug 'Shougo/deoplete.nvim', { 'do': ':UpdateRemotePlugins' }
-" Autocomplete for Python
-Plug 'zchee/deoplete-jedi'
-" Autocomplete for Rust
-Plug 'sebastianmarkow/deoplete-rust'
-Plug 'rust-lang/rust.vim'
 " Autoload and read from dish if file changes
 Plug 'tmux-plugins/vim-tmux-focus-events'
 " For LaTeX support
@@ -112,7 +112,9 @@ set smartcase           " ... unless the query has capital letters.
 set gdefault            " Use 'g' flag by default with :s/foo/bar/.
 set magic               " Use 'magic' patterns (extended regular expressions).
 set autoread            " Autoload file if it changes on disk
+
 set rtp+=/usr/bin/fzf
+set rtp+=~/.config/nvim/plugged/LanguageClient-neovim
 
 set completeopt-=preview
 
@@ -185,10 +187,6 @@ let g:haskell_indent_guard = 2
 let g:haskell_indent_case_alternative = 1
 let g:cabal_indent_section = 2
 
-" For Rust
-let g:deoplete#sources#rust#racer_binary='/home/sanchayan/.cargo/bin/racer'
-let g:deoplete#sources#rust#rust_source_path='/home/sanchayan/GitSources/rust/src'
-
 " Use deoplete.
 let g:deoplete#enable_at_startup = 1
 let g:deoplete#enable_smart_case = 1
@@ -203,3 +201,20 @@ let g:airline_left_sep = ' '
 let g:airline_left_alt_sep = '|'
 let g:airline_right_sep = ' '
 let g:airline_right_alt_sep = '|'
+
+" For Language Client
+set hidden
+let g:LanguageClient_serverCommands = {
+    \ 'haskell': ['hie-wrapper'],
+    \ 'rust': ['/usr/bin/rustup', 'run', 'stable', 'rls'],
+	\ 'python': ['/usr/bin/pyls'],
+    \ }
+
+nnoremap <Leader>lc :call LanguageClient_contextMenu()<CR>
+nnoremap <Leader>lh :call LanguageClient#textDocument_hover()<CR>
+nnoremap <Leader>ld :call LanguageClient#textDocument_definition()<CR>
+nnoremap <Leader>ln :call LanguageClient#textDocument_rename()<CR>
+nnoremap <Leader>lf :call LanguageClient#textDocument_formatting()<CR>
+nnoremap <Leader>lr :call LanguageClient#textDocument_references()<CR>
+nnoremap <Leader>la :call LanguageClient#textDocument_codeAction()<CR>
+nnoremap <Leader>ls :call LanguageClient#textDocument_documentSymbol()<CR>