On Tue, Nov 13 2018, Junio C Hamano wrote:
> A tangetn that somebody might want to tackle. It would be > nice if we had a tool that takes a grep expression (like > '^--no' and '^\[no-' above) and shows histograms of the ages > of lines that match. It might tell us that all 44 combined > ones are more recent (some of them may even have been > updated from the separate form) than the 124 separate ones, > in which case we can say "we started the process of > migrating to list options singly, like '--[no-]option', in > commit X; let's continue doing so" in the log message. Or > it may turn out that we have been going in the other > direction and most of these 44 are stale ones yet to be > split. Without such a tool, the above numbers are the best > measure to go by, which is not quite ideal. This doesn't spew out a histogram, but you can use the various "git grep/blame" one-liners (https://www.google.nl/search?q=git+grep+blame) plus shell one-liner to get something useful: git grep -e '^--no-' -e '^--\[no-' -n | perl -F':' -anpe '$_=`git blame -L$F[1],+1 $F[0]`' | perl -pe 's/^.* (\d{4})-.*\) /$1 /' | sort -n
