Re: Prepending an string option

On 2020-08-17, Anton Shepelev wrote:
> Hello, all
>
> How can one prepend a Vim string option? I need to prepent
> formatlistpat for Markdown. I have tried to combine `set'
> and `execute()', but to no avail. `execute()' is documented
> as returning the command output as a string, yet I can't
> seem to call it as a function and use the return value in
> `set':
>
> set formatlistpat=prepend|execute('set formatlistpat?')
>
> Also I fear I will lose escapes this way. Is it possible to
> preserve them?

Here are a couple of ways to do that.

:execute 'set formatlistpat=' . 'patternprefix' . &formatlistpat

:let &formatlist = 'patternprefix' . &formatlist

where patternprefix is the string you wish to prepend to
'formatlistpat'.

See:

:help :execute
:help :let-option

Note that 'formatlistpat' is a single pattern, not a list of
patterns, so you would not use :set^= to prepend a list element to
it. If interested anyway, see:

:set^=

HTH,
Gary

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