[exim-dev] [Bug 3101] New: allow for list range to be extrac…

https://bugs.exim.org/show_bug.cgi?id=3101

            Bug ID: 3101
           Summary: allow for list range to be extracted in listextract
                    function
           Product: Exim
           Version: 4.98
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: String expansion
          Assignee: unallocated@???
          Reporter: help@???
                CC: exim-dev@???

Please add a listextractrange function to give users the power of Exim's list
handling:



${listextractrange{
[-]$offeset}
[{$limit} optional, if omitted -> until end]
{ [>$output_delimiter, by default same as $input_delimiter] [<$input_delimiter]
$subject }
}



${lookup{${listextractrange{1}{<.$tls_in_sni}}}dsearch{/some/path/to/domains}{$value}{some_default_value}}

this would allow to strip the first subdomain of a domain very easily and use
the power of Exim's list handling as output. Currently the only way to achieve
a similar result would be:

${lookup{${substr{${strlen:${listextract{1}{<.$tls_in_sni}{$value.}}}}{$tls_in_sni}}}dsearch{/some/path/to/domains}{$value}{some_default_value}}

Here we extract the first sub-domain, add a dot at the end, measure its length
through strlen and use that to cut the target string off via substr. This
solution however is sub-optimal since Exim removes unnecessary
(leading+trailing) white-spaces on each element in a list. So the offset could
potentially be distorted by leading white-spaces.

Generally it would be a great benefit for Exim users to have a more powerful
tool at their hands for dealing with lists. Such a function would have many
potential use-cases, not only in connections with domains.

Thank you very much for your consideration as well as the attention.

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