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undofile.vim : persistent undo: enable 'undofile' for certain files only

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created by
Andy Wokula
script type
If you want 'undofile' only for certain files, you will notice that 'undofile' cannot be set in a modeline, or once the buffer is loaded (because an existing undo file will not be loaded then).  Bram suggests to use a BufReadPre autocmd which sets 'undofile' before the buffer is loaded.  This script does the steps for you.



  execute :setlocal undofile, install a BufReadPre autocmd for the current file name and also maintain a plugin file "plugin/undofile_autocmds.vim" that enables all such autocmds at next startup of Vim.

  This means you can execute this command once for the current file and then never ever again -- FIRE AND FORGET ;)

  The plugin file (if not found in the runtimepath) is stored in the first directory of the runtimepath (which must contain a "plugin" folder).  Older Vims will ignore the plugin.

  With [!], ignore if 'undofile' is already set.


  opposite of :SetUndoFile.  Does :setlocal noundofile, removes the autcommand and the autcommand entry from "plugin/undofile_autocmds.vim"; finally it executes :DelUndoFile.


  delete the undofile for the current buffer.  Fails silently.

install details
Note: With Vim 7.3.392 or newer, you can set 'undofile' in the modeline!  No need for this script then ... (2012 Jan 28)

requires the persistent_undo feature (since Vim7.3)
:source this script when needed, or drop it in your plugin folder

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package script version date Vim version user release notes
undofile.vim 0.2 2010-08-14 7.0 Andy Wokula forgot the init folklore
undofile.vim 0.1 2010-08-14 7.2 Andy Wokula Initial upload
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