Re: highlight items in red that are past due

On Tuesday, July 11, 2017 at 1:35:06 AM UTC-4, Nazri wrote:
> On Tue, Jul 11, 2017 at 1:28 AM, Robert <sigzero@gmail.com> wrote:
> > I have a specific tag "due:YYYY-MM-DD" in my files.
> >
> > Is it possible for a function to compare all the matches it finds to today's
> > date and if the "due:" is is past, to highlight it?
>
> Your question can be simplified to "How do I highlight dates that are
> not today?"
>
> Vim regex supports what is known as "look behind" pattern - it is a pattern
> that tells the regex engine to register as positive match if the previous
> sequence of characters matches or does not match a given pattern.
>
> The following search pattern will match all the text "due:YYYY-MM-DD" in your
> file (not quite what you want, yet):
>
> due:[0-9]\{4}-[0-9][0-9]-[0-9][0-9]
>
> To tell the regex engine to exclude today's date use the negative look
> behind pattern \@!:
>
> due:\(2017-07-11\)\@![0-9]\{4}-[0-9][0-9]-[0-9][0-9]
>
> If you do a search using the above regex it will find all "due:" lines
> with dates that doesn't match 2017-07-11.
>
> To highlight the pattern you can put this in your .vimrc:
>
> syn match nottoday 'due:\(2017-07-11\)\@![0-9]\{4}-[0-9][0-9]-[0-9][0-9]'
> hi nottoday ctermfg=yellow guifg=yellow
>
> The next step is to automate the "today's date" part so that if you open the
> file again tomorrow it would exclude tomorrow's date, something like this should
> do it:
>
> function HighlightNotToday()
> exe "syn match nottoday 'due:\\(" . strftime("%Y-%m-%d") .
> "\\)\\@![0-9]\\{4}-[0-9][0-9]-[0-9][0-9]'"
> hi nottoday ctermfg=yellow guifg=yellow
> endfun
> nmap <f4> :call HighlightNotToday()<cr>
>
> nazri

Thanks Nazri, I'll give it shot.

Bob

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