lsp: implement goto features (#1030)

* Send doc text on didOpen

* Rename clap#for() to clap#open_provider()

* Notify didClose on BufDelete

* Impl lsp picker

* Introduce LanguageConfig

* various minor refactorings

* Separate syntax/sublime.rs

* .

* Impl on_move for lsp provider

* Disable lsp plugin by default

* Clippy fixes

* fixes

Author: liuchengxu

Cargo.lock

@@ -177,9 +177,9 @@ function! clap#_exit_provider() abort
   call clap#state#clear_post()
 endfunction
 
-function! clap#_for(provider_id_or_alias) abort
+function! clap#_open_provider(provider_id_or_alias) abort
   let g:clap.provider.args = []
-  call clap#for(a:provider_id_or_alias)
+  call clap#open_provider(a:provider_id_or_alias)
 endfunction
 
 " Sometimes we don't need to go back to the start window, hence clap#_exit_provider() is extracted.
@@ -263,7 +263,7 @@ function! s:try_register_is_ok(provider_id) abort
   return s:validate_provider(registration_info)
 endfunction
 
-function! clap#for(provider_id_or_alias) abort
+function! clap#open_provider(provider_id_or_alias) abort
   if has_key(s:provider_alias, a:provider_id_or_alias)
     let provider_id = s:provider_alias[a:provider_id_or_alias]
   else
@@ -356,7 +356,7 @@ function! clap#(bang, ...) abort
     endif
   endif
 
-  call clap#for(provider_id_or_alias)
+  call clap#open_provider(provider_id_or_alias)
 endfunction
 
 function! clap#run(provider) abort

autoload/clap.vim

@@ -9,7 +9,7 @@ let s:old_input = ''
 
 function! s:relaunch_providers() abort
   call clap#handler#exit()
-  call timer_start(10, { -> clap#for('providers') })
+  call timer_start(10, { -> clap#open_provider('providers') })
   call g:clap.input.set('')
 endfunction
 

autoload/clap/handler.vim

@@ -20,7 +20,7 @@ if clap#maple#is_available()
     if a:error isnot v:null
       return
     endif
-    call clap#state#render_preview(has_key(a:result, 'result') ? a:result.result : a:result)
+    call clap#state#update_picker_preview(has_key(a:result, 'result') ? a:result.result : a:result)
   endfunction
 
   function! s:dispatch_on_move_impl() abort