pkutaj

:help swap-file

  Vim stores the things you changed in a swap file.
  Using the original file you started from plus the swap file
  you can mostly recover your work.

pkutaj

:help undo-persistence

  When unloading a buffer Vim normally destroys the tree of undos
  created for that buffer.  By setting the 'undofile' option,
  Vim will automatically save your undo history when you write a file
  and restore undo history when you edit the file again.

pkutaj

	Swap file	Undo file
Protects against	Crash (unsaved keystrokes)	Wanting to undo after reopening
Causes E325 conflicts	Yes	No
Needs git as safety net	Not if working correctly	Yes, for crash-level recovery
Persists across sessions	No (deleted on close)	Yes

pkutaj

-- in init.lua or options.lua
vim.opt.swapfile = false

-- compensate with persistent undo
vim.opt.undofile = true
vim.opt.undodir = vim.fn.stdpath("state") .. "/undo"

pkutaj

vim.api.nvim_create_autocmd("SwapExists", {
  pattern = "*",
  callback = function()
    vim.v.swapchoice = "e"  -- always edit the disk version
  end,
})

pkutaj

# preview what would be deleted
ls ~/.local/state/nvim/swap/

# remove all stale swap files
rm -f ~/.local/state/nvim/swap/*.swp

pkutaj

// This fails — node_t is not defined yet when used on line 3
typedef struct Node {
  int value;
  node_t *next; // error: unknown type name 'node_t'
} node_t;

pkutaj

typedef struct Node node_t; // forward declaration

typedef struct Node {
  int value;
  node_t *next; // now the compiler knows node_t
} node_t;

pkutaj

1. Signature        ← this is the forward declaration equivalent
2. Purpose
3. Stub
4. Examples/Tests
5. Template
6. Code the body

pkutaj

brew install ttyd