vim change :x function to delete buffer instead of save & quit

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I find the safest alternative is to use an expression abbreviation:

cnoreabbrev <expr> x getcmdtype() == ":" && getcmdline() == 'x' ? 'bd' : 'x'

This will ensure the abbreviation will only be expanded to bd when :x is used otherwise just expand to x.

For more help:

:h map-<expr>
:h getcmdtype()
:h getcmdline()

Upon further inspection there appears to be a plugin that does exactly this by Hari Krishna Dara called cmdalias.vim. It uses a variation of the technique above.

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