Quietly add go to definition support for tsserver

autoload/ale/definition.vim

@@ -0,0 +1,82 @@
+" Author: w0rp <devw0rp@gmail.com>
+" Description: Go to definition support for LSP linters.
+
+let s:go_to_definition_map = {}
+
+" Used to get the definition map in tests.
+function! ale#definition#GetMap() abort
+    return deepcopy(s:go_to_definition_map)
+endfunction
+
+" Used to set the definition map in tests.
+function! ale#definition#SetMap(map) abort
+    let s:go_to_definition_map = a:map
+endfunction
+
+" This function is used so we can check the execution of commands without
+" running them.
+function! ale#definition#Execute(expr) abort
+    execute a:expr
+endfunction
+
+function! ale#definition#Open(options, filename, line, column) abort
+    if a:options.open_in_tab
+        call ale#definition#Execute('tabedit ' . fnameescape(a:filename))
+    else
+        call ale#definition#Execute('edit ' . fnameescape(a:filename))
+    endif
+
+    call cursor(a:line, a:column)
+endfunction
+
+function! ale#definition#HandleTSServerResponse(conn_id, response) abort
+    if get(a:response, 'command', '') is# 'definition'
+    \&& has_key(s:go_to_definition_map, a:response.request_seq)
+        let l:options = remove(s:go_to_definition_map, a:response.request_seq)
+
+        if get(a:response, 'success', v:false) is v:true
+            let l:filename = a:response.body[0].file
+            let l:line = a:response.body[0].start.line
+            let l:column = a:response.body[0].start.offset
+
+            call ale#definition#Open(l:options, l:filename, l:line, l:column)
+        endif
+    endif
+endfunction
+
+function! s:GoToLSPDefinition(linter, options) abort
+    let l:buffer = bufnr('')
+    let [l:line, l:column] = getcurpos()[1:2]
+
+    let l:lsp_details = ale#linter#StartLSP(
+    \   l:buffer,
+    \   a:linter,
+    \   function('ale#definition#HandleTSServerResponse'),
+    \)
+
+    if empty(l:lsp_details)
+        return 0
+    endif
+
+    let l:id = l:lsp_details.connection_id
+    let l:root = l:lsp_details.project_root
+
+    let l:message = ale#lsp#tsserver_message#Definition(
+    \   l:buffer,
+    \   l:line,
+    \   l:column
+    \)
+    let l:request_id = ale#lsp#Send(l:id, l:message, l:root)
+
+    let s:go_to_definition_map[l:request_id] = {
+    \   'open_in_tab': get(a:options, 'open_in_tab', 0),
+    \}
+endfunction
+
+function! ale#definition#GoTo(options) abort
+    for l:linter in ale#linter#Get(&filetype)
+        if l:linter.lsp is# 'tsserver'
+            call s:GoToLSPDefinition(l:linter, a:options)
+        endif
+    endfor
+endfunction

autoload/ale/lsp/tsserver_message.vim

@@ -53,3 +53,11 @@ function! ale#lsp#tsserver_message#CompletionEntryDetails(buffer, line, column,
     \   'entryNames': a:entry_names,
     \}]
 endfunction
+
+function! ale#lsp#tsserver_message#Definition(buffer, line, column) abort
+    return [0, 'ts@definition', {
+    \   'line': a:line,
+    \   'offset': a:column,
+    \   'file': expand('#' . a:buffer . ':p'),
+    \}]
+endfunction