How to count total lines changed by a specific aut

Question

Is there a command I can invoke which will count the lines changed by a specific author in a Git repository? I know that there must be ways to count the number of commits as Github does this for their Impact graph.

Answer 1

Here's a short one-liner that produces stats for all authors. It's much faster than Dan's solution above at https://stackoverflow.com/a/20414465/1102119 (mine has time complexity O(N) instead of O(NM) where N is the number of commits, and M the number of authors).

git log --no-merges --pretty=format:%an --numstat | awk '/./ && !author { author = $0; next } author { ins[author] += $1; del[author] += $2 } /^$/ { author = ""; next } END { for (a in ins) { printf "%10d %10d %10d %s\n", ins[a] - del[a], ins[a], del[a], a } }' | sort -rn

Answer 2

To count number of commits by a given author (or all authors) on a given branch you can use git-shortlog; see especially its --numbered and --summary options, e.g. when run on git repository:

$ git shortlog v1.6.4 --numbered --summary
  6904  Junio C Hamano
  1320  Shawn O. Pearce
  1065  Linus Torvalds
    692  Johannes Schindelin
    443  Eric Wong

Answer 3

you can use whodid (https://www.npmjs.com/package/whodid)

$ npm install whodid -g
$ cd your-project-dir

and

$ whodid author --include-merge=false --path=./ --valid-threshold=1000 --since=1.week

or just type

$ whodid

then you can see result like this

Contribution state
=====================================================
 score  | author
-----------------------------------------------------
 3059   | someguy <[e-mail]>
 585    | somelady <[e-mail]>
 212    | niceguy <[e-mail]>
 173    | coolguy <[e-mail]>
=====================================================

Answer 4

This script here will do it. Put it into authorship.sh, chmod +x it, and you're all set.

#!/bin/sh
declare -A map
while read line; do
    if grep "^[a-zA-Z]" <<< "$line" > /dev/null; then
        current="$line"
        if [ -z "${map[$current]}" ]; then 
            map[$current]=0
        fi
    elif grep "^[0-9]" <<<"$line" >/dev/null; then
        for i in $(cut -f 1,2 <<< "$line"); do
            map[$current]=$((map[$current] + $i))
        done
    fi
done <<< "$(git log --numstat --pretty="%aN")"

for i in "${!map[@]}"; do
    echo -e "$i:${map[$i]}"
done | sort -nr -t ":" -k 2 | column -t -s ":"

Answer 5

The output of the following command should be reasonably easy to send to script to add up the totals:

git log --author="<authorname>" --oneline --shortstat

This gives stats for all commits on the current HEAD. If you want to add up stats in other branches you will have to supply them as arguments to git log.

For passing to a script, removing even the "oneline" format can be done with an empty log format, and as commented by Jakub Narębski, --numstat is another alternative. It generates per-file rather than per-line statistics but is even easier to parse.

git log --author="<authorname>" --pretty=tformat: --numstat

Answer 6

After looking at Alex's and Gerty3000's answer, I have tried to shorten the one-liner:

Basically, using git log numstat and not keeping track of the number of files changed.

Git version 2.1.0 on Mac OSX:

git log --format='%aN' | sort -u | while read name; do echo -en "$name\t"; git log --author="$name" --pretty=tformat: --numstat | awk '{ add += $1; subs += $2; loc += $1 - $2 } END { printf "added lines: %s, removed lines: %s, total lines: %s\n", add, subs, loc }' -; done

Example:

Jared Burrows   added lines: 6826, removed lines: 2825, total lines: 4001