pkg/cli: Add histlist option to reverse listing

[mpenick]

This provides a variable (edit:histlist:reverse) to reverse the listing, with more recent commands at the top, but leaves the default order as more recent at the bottom.

set edit:histlist:reverse = $true

Reversing (most to least recent commands) the histlist makes it easier to see more recent commands quickly without having to look near the bottom of the screen.

[krader1961]

Does this have any implications for the &newest-first option of the edit:command-history command? Should there be an explicit mention that setting this to $true does not affect the default order of that command? And should the documentation for that command have at least a "see also" reference to this variable? Also, AFAICT, this doesn't document the new variable and it doesn't include any unit tests to verify the behavior introduced by this change.

[xiaq]

Hi! Not sure about the exact reason you closed the PR, but this seems like a reasonable feature request.

I'm in the process of rewriting the Elvish TUI so I probably won't be accepting this PR as is (in particular, I'll probably implement a different API), but I filed #1847 to track this.