Add ALERename (tsserver & LSP), ALEOrganizeImports (tsserver) and auto import support (tsserver) (#2709)

This commit adds support for renaming symbols in tsserver and with LSP tools, and for organising imports with tsserver. Completion results for symbols that can be imported are now suggested if enabled for tsserver completion done via ALE.

autoload/ale/organize_imports.vim

@@ -0,0 +1,59 @@
+" Author: Jerko Steiner <jerko.steiner@gmail.com>
+" Description: Organize imports support for tsserver
+"
+function! ale#organize_imports#HandleTSServerResponse(conn_id, response) abort
+    if get(a:response, 'command', '') isnot# 'organizeImports'
+        return
+    endif
+
+    if get(a:response, 'success', v:false) isnot v:true
+        return
+    endif
+
+    let l:file_code_edits =  a:response.body
+
+    call ale#code_action#HandleCodeAction({
+    \   'description': 'Organize Imports',
+    \   'changes': l:file_code_edits,
+    \})
+endfunction
+
+function! s:OnReady(linter, lsp_details) abort
+    let l:id = a:lsp_details.connection_id
+
+    if a:linter.lsp isnot# 'tsserver'
+        call ale#util#Execute('echom ''OrganizeImports currently only works with tsserver''')
+
+        return
+    endif
+
+    let l:buffer = a:lsp_details.buffer
+
+    let l:Callback = function('ale#organize_imports#HandleTSServerResponse')
+
+    call ale#lsp#RegisterCallback(l:id, l:Callback)
+
+    let l:message = ale#lsp#tsserver_message#OrganizeImports(l:buffer)
+
+    let l:request_id = ale#lsp#Send(l:id, l:message)
+endfunction
+
+function! s:OrganizeImports(linter) abort
+    let l:buffer = bufnr('')
+    let [l:line, l:column] = getpos('.')[1:2]
+
+    if a:linter.lsp isnot# 'tsserver'
+        let l:column = min([l:column, len(getline(l:line))])
+    endif
+
+    let l:Callback = function('s:OnReady')
+    call ale#lsp_linter#StartLSP(l:buffer, a:linter, l:Callback)
+endfunction
+
+function! ale#organize_imports#Execute() abort
+    for l:linter in ale#linter#Get(&filetype)
+        if !empty(l:linter.lsp)
+            call s:OrganizeImports(l:linter)
+        endif
+    endfor
+endfunction