show only versions newer than NVM_MIN_VER if set

[ryenus]

This is to fix #3250.

[ryenus]

For example, running NVM_MIN_VER=18 nvm ls-remote --lts when v14 and v16 are installed:

[ljharb]

I like that it's done in awk :-) it'd be great to benchmark the difference to make sure this isn't slowing anything down meaningfully.

this will need tests, and also it'd be good to add a --min option to all the things that talk to the mirror (nvm ls-remote, nvm install, nvm version-remote) and then maybe nvm ls for good measure (altho that can be a follow-on if you like)

[ryenus]

Performance-wise there's not really much change or overhead, you can trust that awk is fast :-) Sometimes it might even run faster, esp. when many older versions are skipped.

Meanwhile the other sibling functions and even the tests are something I'm not really familiar with, may you can chime in here? @ljharb

[ljharb]

Sure - for the tests, there's existing tests for nvm ls-remote that employ mocks for the remote data, and a test that uses the env var, and asserts that it matches the mock minus the first N lines (since older versions aren't going to change, that number won't break over time), that would be sufficient. Similar approaches will work for the others.

For adding an option, if you grep for "ls-remote" you'll find the chunk of code where top-level commands are defined, and there's a bunch of existing examples that process the arguments.