nvim: Configure nvim-completion & remove conflicting LSP bindings

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

nvim/.config/nvim/after/plugin/nvim_lsp.vim

@@ -1,9 +1,9 @@
-nnoremap <silent> gd    <cmd>lua vim.lsp.buf.declaration()<CR>
-nnoremap <silent> <c-]> <cmd>lua vim.lsp.buf.definition()<CR>
-nnoremap <silent> K     <cmd>lua vim.lsp.buf.hover()<CR>
-nnoremap <silent> gD    <cmd>lua vim.lsp.buf.implementation()<CR>
-nnoremap <silent> <c-k> <cmd>lua vim.lsp.buf.signature_help()<CR>
-nnoremap <silent> 1gD   <cmd>lua vim.lsp.buf.type_definition()<CR>
+nnoremap <silent> gd    <cmd>lua vim.lsp.buf.definition()<CR>
+nnoremap <silent> gk    <cmd>lua vim.lsp.buf.hover()<CR>
+nnoremap <silent> gD    <cmd>lua vim.lsp.buf.declaration()<CR>
+nnoremap <silent> gi    <cmd>lua vim.lsp.buf.implementation()<CR>
+nnoremap <silent> gs    <cmd>lua vim.lsp.buf.signature_help()<CR>
+nnoremap <silent> gt    <cmd>lua vim.lsp.buf.type_definition()<CR>
 nnoremap <silent> gr    <cmd>lua vim.lsp.buf.references()<CR>
 nnoremap <silent> g0    <cmd>lua vim.lsp.buf.document_symbol()<CR>
 nnoremap <silent> gW    <cmd>lua vim.lsp.buf.workspace_symbol()<CR>

nvim/.config/nvim/keymappings.vim

@@ -163,6 +163,11 @@ nnoremap <BS> <C-^>
 " Map to ; to : for easy access to command mode. Behaviour of ; can be taken
 " care of by f due to clever-f
 nnoremap ; :
+
+" For nvim-completion
+imap <C-j> <cmd>lua require'source'.prevCompletion()<CR>
+imap <C-k> <cmd>lua require'source'.nextCompletion()<CR>
+
 " Asynchronous make
 command! -bang -nargs=* -complete=file Make call asyncdo#run(<bang>0, &makeprg, <f-args>)
 command! -bang -nargs=* -complete=file LMake call asyncdo#lrun(<bang>0, &makeprg, <f-args>)

nvim/.config/nvim/plugin_settings.vim

@@ -68,5 +68,39 @@ let g:diagnostic_show_sign = 1
 let g:diagnostic_auto_popup_while_jump = 1
 let g:diagnostic_insert_delay = 1
 
+" For nvim-completion
+let g:completion_enable_auto_popup = 1
+let g:completion_auto_change_source = 1
+let g:completion_chain_complete_list = {
+  \ 'c': [
+  \    {'mode': 'keyn'},
+  \    {'mode': 'tags'},
+  \    {'mode': '<c-p>'},
+  \    {'mode': '<c-n>'}
+  \],
+  \ 'haskell': [
+  \    {'mode': 'keyn'},
+  \    {'mode': 'tags'},
+  \    {'mode': '<c-p>'},
+  \    {'mode': '<c-n>'},
+  \    {'mode': 'omni'}
+  \],
+  \ 'rust': [
+  \    {'complete_items': ['lsp']},
+  \    {'mode': 'keyn'}
+  \],
+  \ 'purescript': [
+  \    {'mode': 'keyn'},
+  \    {'mode': 'omni'},
+  \    {'mode': '<c-p>'},
+  \    {'mode': '<c-n>'}
+  \],
+  \ 'default': [
+  \    {'mode': 'keyn'},
+  \    {'mode': '<c-p>'},
+  \    {'mode': '<c-n>'},
+  \],
+  \}
+
 lua require'nvim_lsp'.rust_analyzer.setup{}
 lua require'nvim_lsp'.rust_analyzer.setup{on_attach=require'diagnostic'.on_attach}