whitespace-action
whitespace-action is a variable defined in `
whitespace.el
'.
Its value is
nil
Documentation:
Specify which action is taken when a buffer is visited or written.
It's a list containing some or all of the following values:
nil no action is taken.
cleanup cleanup any bogus whitespace always when local
whitespace is turned on.
See `whitespace-cleanup' and
`whitespace-cleanup-region'.
report-on-bogus report if there is any bogus whitespace always
when local whitespace is turned on.
auto-cleanup cleanup any bogus whitespace when buffer is
written.
See `whitespace-cleanup' and
`whitespace-cleanup-region'.
abort-on-bogus abort if there is any bogus whitespace and the
buffer is written.
warn-if-read-only give a warning if `cleanup' or `auto-cleanup'
is included in `whitespace-action' and the
buffer is read-only.
Any other value is treated as nil.
You can customize this variable.