nvim: init.vim: Improve deoplete bindings

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

nvim/init.vim

@@ -193,6 +193,7 @@ let g:LanguageClient_rootMarkers = ['stack.yaml']
 let g:LanguageClient_serverCommands = {
                     \ 'haskell': ['$HOME/.local/bin/hie-wrapper'],
                     \ 'go'     : ['$HOME/go/bin/gopls'],
+                    \ 'clojure': ['bash', '-c', 'clojure-lsp'],
                     \ }
 
 nnoremap <Leader>ld :call LanguageClient#textDocument_definition()<CR>
@@ -314,8 +315,33 @@ let g:intero_vertical_split = 1
 " OPTIONAL: Make the update time shorter, so the type info will trigger faster.
 set updatetime=1000
 
+augroup deopleteMaps
+  au!
+  " For deoplete Rust
+  au FileType rust nmap <buffer> <Leader>rd <plug>DeopleteRustGoToDefinitionDefault
+  au FileType rust nmap <buffer> <Leader>rc <plug>DeopleteRustShowDocumentation
+  au FileType rust nmap <buffer> <Leader>rv <plug>DeopleteRustGoToDefinitionVSplit
+  au FileType rust nmap <buffer> <Leader>rh <plug>DeopleteRustGoToDefinitionSplit
+  au FileType rust nmap <buffer> <Leader>rt <plug>DeopleteRustGoToDefinitionTab
+augroup END
+
 " Use deoplete
 let g:deoplete#enable_at_startup = 1
+" Disable autocomplete by default
+" let b:deoplete_disable_auto_complete = 1
+" let g:deoplete_disable_auto_complete = 1
+" Let sources be empty by default
+let g:deoplete#sources = {}
+" Disable the candidates in Comment/String syntaxes.
+call deoplete#custom#source('_',
+            \ 'disabled_syntaxes', ['Comment', 'String'])
+call deoplete#custom#option('sources', {
+    \ 'rust': ['racer'],
+    \ 'haskell': ['LanguageClient'],
+    \ 'go': ['LanguageClient'],
+    \ 'clojure': ['LanguageClient'],
+\})
+let g:deoplete#sources#rust#disable_keymap = 1
 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'