Git: How to measure the amount of code changed in a period of time? [duplicate]

Question

I'm looking for a command to execute against my git repo to discover the amount of code changed in a certain period of time.

I want to know how much code was changed since day 'X'. I don't really care about the percentage of code changed by each author.

Answer 1

You can use the --stat option of git diff.

For instance

git diff --stat HEAD HEAD~1

will tell you what changed from the last commit, but I think what's closest to your request is the command

git diff --shortstat HEAD HEAD~1

which will output something like

524 files changed, 1230 insertions(+), 92280 deletions(-)

EDIT

Actually I found this great answer that addresses the same issue much better that I can do.

Answer 2

Following up the excellent answer Gabriele found, the exact command you need is:

git log --since=31/12/2012 --numstat --pretty="%H" | awk '
    NF==3 {plus+=$1; minus+=$2;}
    END   {printf("+%d, -%d\n", plus, minus)}'

(yes, you can paste that onto a single line, but the answer's more readable like this)

The key difference is the in a certain period of time requirement, handled by the --since argument.

Answer 3

As a less awksome alternative:

REV=$(git rev-list -n1 --before="1 month ago" master)
git diff --shortstat $REV..master

The "before" date can of course be a more standard representation of time as well.