Question

I have a file that has a list of commit ids in it and I’m trying to write a script that calculates the number of lines in each commit. What is the easiest/best way to do this? I already have a few lines of python written, but I’m open to any language really.

Answer 1

Use --numstat (for per-file changes) or --shortstat (for the sum of the changes) as an argument to git show, git log, or git diff-tree.

For example, in bash:

while read sha; do
  git diff-tree --shortstat $sha $sha^
done

Note that the various diffstat flags can be passed to almost any git command that examines a commit, but they are only documented in the man page of git-diff-tree.