Added support to yeagappan lsp (#472)

* Added support to yeagappan lsp

* Update README and docs.

README.md

@@ -53,6 +53,7 @@ In addition to being a tags viewer, vista.vim can also be a symbol navigator sim
   - [x] [LanguageClient-neovim](https://github.com/autozimu/LanguageClient-neovim)
   - [x] [vim-lsc](https://github.com/natebosch/vim-lsc)
   - [x] [nvim-lspconfig](https://github.com/neovim/nvim-lspconfig)
+  - [x] [yegappan lsp](https://github.com/yegappan/lsp)
 - [x] Finder for tags and LSP symbols.
   - [x] [fzf](https://github.com/junegunn/fzf)
   - [x] [skim](https://github.com/lotabout/skim)

autoload/vista/executive/yegappan_lsp.vim

@@ -0,0 +1,90 @@
+" Copyright (c) 2019 Liu-Cheng Xu
+" MIT License
+" vim: ts=2 sw=2 sts=2 et
+
+let s:provider = fnamemodify(expand('<sfile>'), ':t:r')
+
+let s:reload_only = v:false
+let s:should_display = v:false
+
+let s:fetching = v:true
+
+function! s:HandleLSPResponse(server, results) abort
+  let s:fetching = v:false
+  if empty(a:results)
+    return []
+  endif
+
+  let s:data = vista#renderer#LSPPreprocess(a:results)
+
+  if !empty(s:data)
+    let [s:reload_only, s:should_display] = vista#renderer#LSPProcess(s:data, s:reload_only, s:should_display)
+
+    " Update cache when new data comes.
+    let s:cache = get(s:, 'cache', {})
+    let s:cache[s:fpath] = s:data
+    let s:cache.ftime = getftime(s:fpath)
+    let s:cache.bufnr = bufnr('')
+  endif
+
+  call vista#cursor#TryInitialRun()
+endfunction
+
+function! s:AutoUpdate(fpath) abort
+  let s:reload_only = v:true
+  let s:fpath = a:fpath
+  call s:RunAsync()
+endfunction
+
+function! s:Run() abort
+  call s:RunAsync()
+  while s:fetching
+    sleep 100m
+  endwhile
+  return get(s:, 'data', {})
+endfunction
+
+function! s:RunAsync() abort
+  call vista#SetProvider(s:provider)
+
+  let bufnum = bufnr('%')
+  let params = #{textDocument: #{uri: lsp#util#LspFileToUri(bufname(bufnum))}}
+  let servers = lsp#buffer#BufLspServersGet(bufnum)
+
+  for server in servers
+    if !server.isDocumentSymbolProvider
+        continue
+    endif
+
+    silent call server.rpc_a('textDocument/documentSymbol', params, function('s:HandleLSPResponse'))
+  endfor
+endfunction
+
+function! vista#executive#yegappan_lsp#Run(fpath) abort
+  let s:fpath = a:fpath
+  return s:Run()
+endfunction
+
+function! vista#executive#yegappan_lsp#RunAsync() abort
+  call s:RunAsync()
+endfunction
+
+function! vista#executive#yegappan_lsp#Execute(bang, should_display, ...) abort
+  call vista#source#Update(bufnr('%'), winnr(), expand('%'), expand('%:p'))
+  let s:fpath = expand('%:p')
+
+  call vista#OnExecute(s:provider, function('s:AutoUpdate'))
+
+  let g:vista.silent = v:false
+  let s:should_display = a:should_display
+
+  if a:bang
+    return s:Run()
+  else
+    call s:RunAsync()
+  endif
+endfunction
+
+function! vista#executive#yegappan_lsp#Cache() abort
+  return get(s:, 'cache', {})
+endfunction

doc/vista.txt

@@ -47,6 +47,7 @@ FEATURES                                                          *vista-feature
     [x] LanguageClient-neovim (https://github.com/autozimu/LanguageClient-neovim)
     [x] vim-lsc (https://github.com/natebosch/vim-lsc)
     [x] nvim-lsp (https://github.com/neovim/neovim)
+    [x] yegappan lsp (https://github.com/yegappan/lsp)
 [x] Finder for tags and LSP symbols.
     [x] fzf (https://github.com/junegunn/fzf)
 [x] Display decent detailed symbol info in cmdline.
@@ -124,6 +125,8 @@ Vista                                                                      *Vist
 
   `:Vista nvim_lsp`  open vista window based on nvim-lsp.
 
+  `:Vista yegappan_lsp`  open vista window based on yeagappan lsp.
+
                                                                     *vista-finder*
 
   `:Vista finder`   same with `:Vista finder fzf:ctags` .