[FEATURE] Filter to get first or last line

[mhalano]

Is your feature request related to a problem? Please describe.
I use webchanges to query Debian packages versions that are available in the repository using re.findall and RegEx groups, but it returns plenty of lines, and sometimes I just want the first line or the last one.

Describe the solution you'd like.
An option like first_line and last_line to filter just one of these lines.

Describe alternatives you've considered.
I tried using RegEx but couldn't find a suitable parameter.

Additional context.
For example, with this query I just want the last line that show the newer version.

[mborsetti]

Great idea!

[mborsetti]

For example, with this query I just want the last line that show the newer version.

You can keep the query as is and use additions_only; that will notify if a new line is added at the bottom, as it will have a new version number.

On second thought, I am not sure if that filter is really needed; is there another use case?

[mhalano]

For example, with this query I just want the last line that show the newer version.

You can keep the query as is and use additions_only; that will notify if a new line is added at the bottom, as it will have a new version number.

On second thought, I am not sure if that filter is really needed; is there another use case?

I mean in the screenshot. So instead of appear two lines, like in the screenshot, it would just appear "0.9.5-2", the line I want to check for changes. Got it?

[mhalano]

Like if you have a page that shows, let's say, 5 items, and when a new item appears it becomes the first, or the last, item and one item disappears because it's shows just 5 items.
In this case, it would be more useful to just get the first, or the last, item, the one that updates, even you could get all the 5 items because you could keep an eye on the item value.

[mborsetti]

Good news: it turns out you can write Regexes to do this, and apply the re.findall filter.

See new examples in the documentation for v3.24 just released.