add window/showDocument support

Author: ompugao

autoload/lsp.vim

@@ -630,6 +630,9 @@ function! lsp#default_get_supported_capabilities(server_info) abort
     \   },
     \   'window': {
     \       'workDoneProgress': g:lsp_work_done_progress_enabled ? v:true : v:false,
+    \       'showDocument': {
+    \           'support': g:lsp_experimental_show_document ? v:true : v:false,
+    \       },
     \   },
     \   'workspace': {
     \       'applyEdit': v:true,
@@ -944,6 +947,15 @@ function! s:on_request(server_name, id, request) abort
         endif
     elseif a:request['method'] ==# 'window/workDoneProgress/create'
         call s:send_response(a:server_name, { 'id': a:request['id'], 'result': v:null})
+    elseif a:request['method'] ==# 'window/showDocument'
+        if !g:lsp_experimental_show_document | return | endif
+        let l:cmd = g:lsp_show_document_command
+        if has_key(a:request['params'], 'selection')
+            let l:cmd .= " +" . a:request['params']['selection']['start']['line']
+        endif
+        let l:cmd .= " " . lsp#utils#uri_to_path(a:request['params']['uri'])
+        execute l:cmd
+        call s:send_response(a:server_name, { 'id': a:request['id'], 'result': {'success': v:true}})
     else
         " TODO: for now comment this out until we figure out a better solution.
         " We need to comment this out so that others outside of vim-lsp can

doc/vim-lsp.txt

@@ -2241,6 +2241,14 @@ call `root_uri` function to detect the workspace folder. If the folder is not
 part of workspace folder, it will automatically notify the server to add the
 workspace folder.
 
+==============================================================================
+Show Document                                         *vim-lsp-show-document*
+
+Show Document is an experimental feature of vim-lsp. To enable this, set
+folders set `let g:lsp_experimental_show_document = 1`.
+
+When the client and the server supports Show Document, the client open a file
+requested from the server.
 =============================================================================
 License                                                    *vim-lsp-license*
 

plugin/lsp.vim

@@ -88,6 +88,8 @@ let g:lsp_get_supported_capabilities = get(g:, 'lsp_get_supported_capabilities',
 let g:lsp_document_symbol_detail = get(g:, 'lsp_document_symbol_detail', 0)
 
 let g:lsp_experimental_workspace_folders = get(g:, 'lsp_experimental_workspace_folders', 0)
+let g:lsp_experimental_show_document = get(g:, 'lsp_experimental_show_document', 0)
+let g:lsp_show_document_command = get(g:, 'lsp_show_document_command', 'edit')
 
 if g:lsp_auto_enable
     augroup lsp_auto_enable