feat: option to auto-save files affected by will_rename_files (#218)

* save buffers changed by will_rename_files

* prevent closing already open buffers

* chore: move to config option

* chore: fixes

* fix: a crash and some formatting

---------

Co-authored-by: Steven Arcangeli <506791+stevearc@users.noreply.github.com>

lua/oil/config.lua

@@ -38,6 +38,9 @@ local default_config = {
   -- You can set the delay to false to disable cleanup entirely
   -- Note that the cleanup process only starts when none of the oil buffers are currently displayed
   cleanup_delay_ms = 2000,
+  -- Set to true to autosave buffers that are updated with LSP willRenameFiles
+  -- Set to "unmodified" to only save unmodified buffers
+  lsp_rename_autosave = false,
   -- Keymaps in oil buffer. Can be any value that `vim.keymap.set` accepts OR a table of keymap
   -- options with a `callback` (e.g. { callback = function() ... end, desc = "", mode = "n" })
   -- Additionally, if it is a string that matches "actions.<name>",

lua/oil/lsp_helpers.lua

@@ -1,3 +1,4 @@
+local config = require("oil.config")
 local fs = require("oil.fs")
 local util = require("oil.util")
 
@@ -71,6 +72,18 @@ local function get_matching_paths(client, path_pairs)
   end
 end
 
+---@return table<number, {is_open: boolean, is_modified: boolean}>
+local function get_buffers_status()
+  local buffers_status = {}
+  local buffers = vim.api.nvim_list_bufs()
+  for _, bufnr in ipairs(buffers) do
+    buffers_status[bufnr] = {
+      is_modified = vim.bo[bufnr].modified,
+    }
+  end
+  return buffers_status
+end
+
 ---Process LSP rename in the background
 ---@param actions oil.MoveAction[]
 M.will_rename_files = function(actions)
@@ -87,18 +100,38 @@ M.will_rename_files = function(actions)
 
   local clients = vim.lsp.get_active_clients()
   for _, client in ipairs(clients) do
-    local pairs = get_matching_paths(client, path_pairs)
-    if pairs then
+    local matching_paths = get_matching_paths(client, path_pairs)
+    if matching_paths then
       client.request("workspace/willRenameFiles", {
         files = vim.tbl_map(function(pair)
           return {
             oldUri = vim.uri_from_fname(pair.src),
             newUri = vim.uri_from_fname(pair.dest),
           }
-        end, pairs),
+        end, matching_paths),
       }, function(_, result)
         if result then
+          local buffers_status = get_buffers_status()
           vim.lsp.util.apply_workspace_edit(result, client.offset_encoding)
+          local autosave = config.lsp_rename_autosave
+          if autosave == false then
+            return
+          end
+
+          for uri in pairs(result.changes) do
+            local bufnr = vim.uri_to_bufnr(uri)
+            local is_open = buffers_status[bufnr] ~= nil
+            local is_modified = is_open and buffers_status[bufnr].is_modified
+            local should_save = autosave == true or (autosave == "unmodified" and not is_modified)
+            if should_save then
+              vim.api.nvim_buf_call(bufnr, function()
+                vim.cmd.update()
+              end)
+              if not is_open then
+                vim.api.nvim_buf_delete(bufnr, { force = true })
+              end
+            end
+          end
         end
       end)
     end