Did you encounter this problem: You need to find a specific search term in the whole git history?
You can do that by:
git log -S$searchstring
$searchstring is what you are looking for.
If you want to look for all commits by the name of the author use:
git log --author $author
And in case you need to combine it:
git log --author $author -S$searchstring
Did it help you?
Best,
Frank