added new action 'file_switch' (closes #301)

lua/fzf-lua/actions.lua

@@ -173,6 +173,32 @@ M.file_edit_or_qf = function(selected, opts)
   end
 end
 
+M.file_switch = function(selected, opts)
+  local bufnr = nil
+  local entry = path.entry_to_file(selected[1])
+  local fullpath = entry.path
+  if not path.starts_with_separator(fullpath) then
+    fullpath = path.join({opts.cwd or vim.loop.cwd(), fullpath})
+  end
+  for _, b in ipairs(vim.api.nvim_list_bufs()) do
+    local bname = vim.api.nvim_buf_get_name(b)
+    if bname and bname == fullpath then
+      bufnr = b
+      break
+    end
+  end
+  if not bufnr then return false end
+  local is_term = utils.is_term_buffer(0)
+  if not is_term then vim.cmd("normal! m`") end
+  local winid = utils.winid_from_tab_buf(0, bufnr)
+  if winid then vim.api.nvim_set_current_win(winid) end
+  if entry.line>1 or entry.col>1 then
+    vim.api.nvim_win_set_cursor(0, {tonumber(entry.line), tonumber(entry.col)-1})
+  end
+  if not is_term then vim.cmd("norm! zvzz") end
+  return true
+end
+
 -- buffer actions
 M.vimcmd_buf = function(vimcmd, selected, _)
   for i = 1, #selected do

lua/fzf-lua/config.lua

@@ -725,6 +725,7 @@ M._action_to_helpstr = {
   [actions.file_vsplit]           = "file-vsplit",
   [actions.file_tabedit]          = "file-tabedit",
   [actions.file_sel_to_qf]        = "file-selection-to-qf",
+  [actions.file_switch]           = "file-switch",
   [actions.buf_edit]              = "buffer-edit",
   [actions.buf_split]             = "buffer-split",
   [actions.buf_vsplit]            = "buffer-vsplit",