lsp: Add support for delete workspaceEdit resource operation

runtime/lua/vim/lsp/protocol.lua

@@ -750,7 +750,7 @@ function protocol.make_client_capabilities()
       workspaceFolders = true;
       applyEdit = true;
       workspaceEdit = {
-        resourceOperations = {'rename', 'create',},
+        resourceOperations = {'rename', 'create', 'delete',},
       };
     };
     callHierarchy = {

runtime/lua/vim/lsp/util.lua

@@ -647,6 +647,27 @@ local function create_file(change)
 end
 
 
+local function delete_file(change)
+  local opts = change.options or {}
+  local fname = vim.uri_to_fname(change.uri)
+  local stat = vim.loop.fs_stat(fname)
+  if opts.ignoreIfNotExists and not stat then
+    return
+  end
+  assert(stat, "Cannot delete not existing file or folder " .. fname)
+  local flags
+  if stat and stat.type == 'directory' then
+    flags = opts.recursive and 'rf' or 'd'
+  else
+    flags = ''
+  end
+  local bufnr = vim.fn.bufadd(fname)
+  local result = tonumber(vim.fn.delete(fname, flags))
+  assert(result == 0, 'Could not delete file: ' .. fname .. ', stat: ' .. vim.inspect(stat))
+  api.nvim_buf_delete(bufnr, { force = true })
+end
+
+
 --- Applies a `WorkspaceEdit`.
 ---
 --@param workspace_edit (table) `WorkspaceEdit`
@@ -662,8 +683,9 @@ function M.apply_workspace_edit(workspace_edit)
         )
       elseif change.kind == 'create' then
         create_file(change)
+      elseif change.kind == 'delete' then
+        delete_file(change)
       elseif change.kind then
-        -- TODO(ashkan) handle DeleteFile
         error(string.format("Unsupported change: %q", vim.inspect(change)))
       else
         M.apply_text_document_edit(change, idx)

test/functional/plugin/lsp_spec.lua

@@ -1319,6 +1319,45 @@ describe('LSP', function()
       eq(true, exec_lua('return vim.loop.fs_stat(...) ~= nil', tmpfile))
       eq('', read_file(tmpfile))
     end)
+    it('DeleteFile delete file and buffer', function()
+      local tmpfile = helpers.tmpname()
+      write_file(tmpfile, 'Be gone')
+      local uri = exec_lua([[
+        local fname = select(1, ...)
+        local bufnr = vim.fn.bufadd(fname)
+        vim.fn.bufload(bufnr)
+        return vim.uri_from_fname(fname)
+      ]], tmpfile)
+      local edit = {
+        documentChanges = {
+          {
+            kind = 'delete',
+            uri = uri,
+          }
+        }
+      }
+      eq(true, pcall(exec_lua, 'vim.lsp.util.apply_workspace_edit(...)', edit))
+      eq(false, exec_lua('return vim.loop.fs_stat(...) ~= nil', tmpfile))
+      eq(false, exec_lua('return vim.api.nvim_buf_is_loaded(vim.fn.bufadd(...))', tmpfile))
+    end)
+    it('DeleteFile fails if file does not exist and ignoreIfNotExists is false', function()
+      local tmpfile = helpers.tmpname()
+      os.remove(tmpfile)
+      local uri = exec_lua('return vim.uri_from_fname(...)', tmpfile)
+      local edit = {
+        documentChanges = {
+          {
+            kind = 'delete',
+            uri = uri,
+            options = {
+              ignoreIfNotExists = false,
+            }
+          }
+        }
+      }
+      eq(false, pcall(exec_lua, 'vim.lsp.util.apply_workspace_edit(...)', edit))
+      eq(false, exec_lua('return vim.loop.fs_stat(...) ~= nil', tmpfile))
+    end)
   end)
 
   describe('completion_list_to_complete_items', function()