Re: question on VIM syntax: highlight an entire paragraph

2016-04-18 0:11 GMT+03:00 Tom M <7tommm@gmail.com>:
> On Sunday, April 17, 2016 at 4:34:04 PM UTC, ZyX wrote:
>> 2016-04-17 17:52 GMT+03:00 porphyry5 wrote:
>> > On Saturday, April 16, 2016 at 3:48:52 PM UTC-7, Jose Caballero wrote:
>> >> Is it possible to highlight an entire paragraph based on a single line content?
>> >> I would be interested in changing the color of an entire block of
>> >> configuration lines if one of those lines in the block is "enabled =
>> >> False", for example.
>> >>
>> >> I am so new to this (*) that I am not even sure what would be the key
>> >> words to search for it on google.... So any tip or advice is more than
>> >> welcome.
>> >>
>> >> What is a "paragraph"? Also what exactly you mean by "highlight",
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> Fair questions, I guess. I will try to be more clear.
>> >>
>> >>
>> >> I would like to have a VIM syntax file that changes the color or entire paragraphs (a set of lines between two blank lines) if one of the lines in the paragraph matches pattern
>> >> "enabled = False".
>> >>
>> >>
>> >> I hope now I explained myself better.
>> >>
>> >>
>> >> Jose
>> >
>> > If you use search hilighting this might do what you want
>> > /\n\(.*\n\)\{-}.*enabled = False.*\n\(.*\n\)\{-}\n
>>
>> It will not.
>>
>> 1. I did mess up with \@= and \@<= for a reason. Without them regex
>> will not highlight successive matches.
>
> What successive matches won't be highlighted without \@= or \@<= ?
> This seems to work even without them:
>
> syntax match PreProc /\(..*\n\)*.*enabled = False.*\n\(..*\n\)*/

This one highlights correctly, but when used as a search it is not correct: for

foo
bar
enabled = False

this produces three matches. Though I must admit, \@= group in my
regex was not necessary.

Since I first tested highlighting by searching I would not possibly
think of such solution, but for :syn it is better then mine.

>
>> 2. It does not highlight an entire paragraph *ever*. \n\(.*\n\) does
>> *not* match *only* at the empty line. It matches everywhere where
>> there are two successive lines.
>> 3. First \{-} does *not* work like you think. In
>>
>> foo
>> enabled = True
>>
>> enabled = False
>> bar
>>
>> test
>>
>> it will highlight starting from the EOL at the first line till EOL
>> just below bar. Engine captures the first place where \n matches tries
>> to match the following \(…\)\{-} as less times as possible, then
>> proceeds with the rest of the pattern. If matching succeeds it has
>> absolutely no reason to retry from the other place where \n matches
>> just to make sure \(…\)\{-} is matched even less times.
>> 4. Your regex does not work for sections which are placed at the end
>> of the file.
>> 5. Your regex works for sections which are placed at the beginning of
>> the file only because of 2. But it will not work if `enabled = False`
>> is the very first line in the file.
>>
>> >
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>
> Tom
>
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