[cmake-developers] string SUBSTRING TRUNCATE mode

[Domen Vrankar]

Hi,

I wrote a patch that adds functionality to string SUBSTRING command:

string(SUBSTRING <string> <begin> <length> <output variable> [TRUNCATE])

When TRUNCATE is set this is valid:

cmake_minimum_required (VERSION 3.0)
project(string_test)
set(test_str "abcd")
string(SUBSTRING ${test_str} 2 6 substr TRUNCATE)
message(${test_str})
message(${substr})

If length is set to a higher value than the length of the original
string the substring is still created but its end is the end of
original string.

If this functionality would be welcome I'll write the tests and documentation.

TRUNCATE could also be renamed to SHORTEN or something more
appropriate since we aren't truncating the string but are just
lowering the length parameter. Suggestions are welcome.

Thanks,
Domen
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