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I beheld quite a few usage of "function!" in others vimrc files, but there is no easy-to-find documentation of "function!".
What's the difference between "function" and "function!"?
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Vimscript is a powerful scripting language that lets you modify and extend the Vim editor. You can use it to create new tools, simplify common tasks, and even rework existing features of the editor.
Plain old :echo will print output, but it will often disappear by the time your script is done. Using :echom will save the output and let you run :messages to view it later.
You can always execute Vimscript by running each command in command mode (the one you prefix with : ), or by executing the file with commands using a :source command. Historically, Vim scripts have a . vim extension. Here, :so is a short version of :source , and % refers to the currently open file.
:help user-functions
When a function by this name already exists and [!] is
not used an error message is given. When [!] is used,
an existing function is silently replaced. Unless it
is currently being executed, that is an error.
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In general, it suppresses the messages the command may spit out.
For instance, using function!, you can redeclare an already defined function.
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