Question

git diff --stat and git log --stat show output like:

$ git diff -C --stat HEAD c9af3e6136e8aec1f79368c2a6164e56bf7a7e07
app/controllers/application_controller.rb |   34 +++-------------------------
1 files changed, 4 insertions(+), 30 deletions(-)

But what really happened in that commit was that 4 lines were changed and 26 lines were deleted which is different than adding 4 lines and deleting 30.

Is there any way of getting the delta LOCs (26 in this case)? I don’t really care about differentiating between lines added or removed.

Answer 1

For per-file numerical diff information:

git diff --numstat

For aggregated numerical diff information:

git diff --shortstat

As far as separating modification from an add and remove pair, --word-diff might help. You could try something like this:

MOD_PATTERN='^.+(\[-|\{\+).*$' \
ADD_PATTERN='^\{\+.*\+\}$' \
REM_PATTERN='^\[-.*-\]$' \
git diff --word-diff --unified=0 | sed -nr \
    -e "s/$MOD_PATTERN/modified/p" \
    -e "s/$ADD_PATTERN/added/p" \
    -e "s/$REM_PATTERN/removed/p" \
    | sort | uniq -c

It’s a little long-winded so you may want to parse it in your own script instead.