Open Source Software Scripting in Vim

“I’ve been using the open source editor Vim for an alarming
number of years now, but I only very recently encountered its
scripting capabilities. Here I’ll look at writing a quick script in
Vim’s built-in scripting language. You can also use another
scripting language if you prefer.

“Vimscript is function-based. Here’s an example of a function to
put in your ~/.vimrc that puts a single text underline (a row of
dashes) under the current line. Note that function names must start
with a capital letter to distinguish them from built-in
functions.”

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