Support untitled buffer (#1152)

* Support untitled buffer

* Enable opt out

* Add documentation

* Add documentation

* Use correct buffer names

* Wipeout file contents

autoload/lsp.vim

@@ -212,6 +212,9 @@ function! s:register_events() abort
         if exists('##TextChangedP')
             autocmd TextChangedP * call s:on_text_document_did_change()
         endif
+        if g:lsp_untitled_buffer_enabled
+            autocmd FileType * call s:on_filetype_changed(bufnr('<afile>'))
+        endif
     augroup END
 
     for l:bufnr in range(1, bufnr('$'))
@@ -228,6 +231,12 @@ function! s:unregister_events() abort
     doautocmd <nomodeline> User lsp_unregister_server
 endfunction
 
+function! s:on_filetype_changed(buf) abort
+  call s:on_buf_wipeout(a:buf)
+  " TODO: stop unused servers
+  call s:on_text_document_did_open()
+endfunction
+
 function! s:on_text_document_did_open(...) abort
     let l:buf = a:0 > 0 ? a:1 : bufnr('%')
     if getbufvar(l:buf, '&buftype') ==# 'terminal' | return | endif

autoload/lsp/utils.vim

@@ -167,7 +167,12 @@ function! lsp#utils#get_buffer_path(...) abort
 endfunction
 
 function! lsp#utils#get_buffer_uri(...) abort
-    return lsp#utils#path_to_uri(expand((a:0 > 0 ? '#' . a:1 : '%') . ':p'))
+    let l:name = a:0 > 0 ? bufname(a:1) : expand('%')
+    if empty(l:name)
+        let l:nr = a:0 > 0 ? a:1 : bufnr('%')
+        let l:name = printf('%s/__NO_NAME_%d__', getcwd(), l:nr)
+    endif
+    return lsp#utils#path_to_uri(fnamemodify(l:name, ':p'))
 endfunction
 
 " Find a nearest to a `path` parent directory `directoryname` by traversing the filesystem upwards

doc/vim-lsp.txt

@@ -75,6 +75,7 @@ CONTENTS                                                  *vim-lsp-contents*
       g:lsp_show_message_request_enabled    |g:lsp_show_message_request_enabled|
       g:lsp_work_done_progress_enabled      |g:lsp_work_done_progress_enabled|
       g:lsp_show_message_log_level          |g:lsp_show_message_log_level|
+      g:lsp_untitled_buffer_enabled          |g:lsp_untitled_buffer_enabled|
     Functions                             |vim-lsp-functions|
       lsp#enable                            |lsp#enable()|
       lsp#disable                           |lsp#disable()|
@@ -941,6 +942,13 @@ g:lsp_show_message_log_level                *g:lsp_show_message_log_level*
     shown but `'info'` level and `'log'` level messages are not shown. Setting
     `'none'` disables to show messages completely.
 
+g:lsp_untitled_buffer_enabled                *g:lsp_untitled_buffer_enabled*
+    Type: |Number|
+    Default: `1`
+
+    Determines whether or not vim-lsp plugin is enabled for untitled buffer.
+    Set to `0` to disable for untitled buffer.
+
 ==============================================================================
 FUNCTIONS                                               *vim-lsp-functions*
 

plugin/lsp.vim

@@ -68,6 +68,7 @@ let g:lsp_tagfunc_source_methods = get(g:, 'lsp_tagfunc_source_methods', ['defin
 let g:lsp_show_message_request_enabled = get(g:, 'lsp_show_message_request_enabled', 1)
 let g:lsp_show_message_log_level = get(g:, 'lsp_show_message_log_level', 'warning')
 let g:lsp_work_done_progress_enabled = get(g:, 'lsp_work_done_progress_enabled', 0)
+let g:lsp_untitled_buffer_enabled = get(g:, 'lsp_untitled_buffer_enabled', 1)
 
 let g:lsp_get_supported_capabilities = get(g:, 'lsp_get_supported_capabilities', [function('lsp#default_get_supported_capabilities')])