Improve oldfiles Picker (#657)

lua/telescope/builtin/internal.lua

@@ -231,9 +231,37 @@ internal.loclist = function(opts)
 end
 
 internal.oldfiles = function(opts)
-  local results = vim.tbl_filter(function(val)
-    return 0 ~= vim.fn.filereadable(val)
-  end, vim.v.oldfiles)
+  opts.include_current_session = utils.get_default(opts.include_current_session, true)
+
+  local current_buffer = vim.api.nvim_get_current_buf()
+  local current_file = vim.api.nvim_buf_get_name(current_buffer)
+  local results = {}
+
+  if opts.include_current_session then
+    for _, buffer in ipairs(vim.split(vim.fn.execute(':buffers! t'), "\n")) do
+      local match = tonumber(string.match(buffer, '%s*(%d+)'))
+      if match then
+        local file = vim.api.nvim_buf_get_name(match)
+        if vim.loop.fs_stat(file) and match ~= current_buffer then
+          table.insert(results, file)
+        end
+      end
+    end
+  end
+
+  for _, file in ipairs(vim.v.oldfiles) do
+    if vim.loop.fs_stat(file) and not vim.tbl_contains(results, file) and file ~= current_file then
+      table.insert(results, file)
+    end
+  end
+
+  if opts.cwd_only then
+    local cwd = vim.loop.cwd()
+    results = vim.tbl_filter(function(file)
+      return vim.fn.matchstrpos(file, cwd)[2] ~= -1
+    end, results)
+  end
+
   pickers.new(opts, {
     prompt_title = 'Oldfiles',
     finder = finders.new_table{