Add -p/--preserve-new-email-case switch.

[ConradHughes]

Hi Adam,

Thanks for creating such a helpful script! Very useful for conforming old repos to GitHub's email security features.

I found the automatic lower-casing of the new email address conflicted with GitHub's default use of mixed case in email addresses (to match mixed case account names), so added this --preserve-new-email-case switch to disable the lower-casing (I know the addresses are case-insensitive, but the mismatch grated). Might be useful to others.

Best,
Conrad

[adamdehaven]

@ConradHughes I appreciate the feedback, and you caught something I hadn't really taken into account. I really appreciate the work you put into this pull request; however, I think the better solution is to not automatically transform the new email address to lowercase.

The script transforms the old email address to lowercase so that it will do a case-insensitive match when replacing in the commit history, but as you pointed out, for the new email address, it makes more sense to accept the email as the user provides it, as-is.

I have updated the script with this change in place, v2.3.1. You can download the update from the releases page and let me know if this works for you! 👍🏼

[ConradHughes]

All good — thanks again!