Issue #30 Add utility to get client capabilities for LSP server config

README.md

@@ -121,6 +121,28 @@ require("lsp-file-operations").setup {
   timeout_ms = 10000,
 }
 ```
+Some LSP servers also expect to be informed about the extended client capabilities.
+If you use [nvim-lspconfig](https://github.com/neovim/nvim-lspconfig) you can configure the default client capabilities that will
+be sent to all servers like this:
+
+```lua
+local lspconfig = require'lspconfig'
+
+-- Set global defaults for all servers
+lspconfig.util.default_config = vim.tbl_extend(
+  'force',
+  lspconfig.util.default_config,
+  {
+    capabilities = vim.tbl_deep_extend(
+      "force",
+      vim.lsp.protocol.make_client_capabilities(),
+      -- returns configured operations if setup() was already called
+      -- or default operations if not
+      require'lsp-file-operations'.default_capabilities(),
+    )
+  }
+)
+```
 
 ## Contributing
 

lua/lsp-file-operations.lua

@@ -24,6 +24,15 @@ local modules = {
   didDeleteFiles = "lsp-file-operations.did-delete",
 }
 
+local capabilities = {
+  willRenameFiles = "willRename",
+  didRenameFiles = "didRename",
+  willCreateFiles = "willCreate",
+  didCreateFiles = "didCreate",
+  willDeleteFiles = "willDelete",
+  didDeleteFiles = "didDelete",
+}
+
 ---@alias HandlerMap table<string, string[]> a mapping from modules to events that trigger it
 
 --- helper function to subscribe events to a given module callback
@@ -108,4 +117,19 @@ M.setup = function(opts)
   end
 end
 
+--- The extra client capabilities provided by this plugin. To be merged with
+--- vim.lsp.protocol.make_client_capabilities() and sent to the LSP server.
+M.default_capabilities = function()
+  local config = M.config or default_config
+  local result = {
+    workspace = {
+      fileOperations = {}
+    }
+  }
+  for operation, capability in pairs(capabilities) do
+    result.workspace.fileOperations[capability] = config.operations[operation]
+  end
+  return result
+end
+
 return M