Show number of changed lines per author in git

Question

i want to see the number of removed/added line, grouped by author for a given branch in git history. there is git shortlog -s which shows me the number of commits per author. is there anything similar to get an overall diffstat?

Answer 1

From How to count total lines changed by a specific author in a Git repository?

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.

Answer 2

Since the SO question "How to count total lines changed by a specific author in a Git repository?" is not completely satisfactory, commandlinefu has alternatives (albeit not per branch):

git ls-files | while read i; do git blame $i | sed -e 's/^[^(]*(//' -e 's/^\([^[:digit:]]*\)[[:space:]]\+[[:digit:]].*/\1/'; done | sort | uniq -ic | sort -nr

It includes binary files, which is not good, so you could (to remove really random binary files):

git ls-files | grep -v "\.\(pdf\|psd\|tif\)$"

(Note: as commented by trcarden, a -x or --exclude option wouldn't work.
From git ls-files man page, git ls-files -x "*pdf" ... would only excluded untracked content, if --others or --ignored were added to the git ls-files command.)

Or:

git ls-files "*.py" "*.html" "*.css" 

to only include specific file types.

---

Still, a "git log"-based solution should be better, like:

git log --numstat --pretty="%H" --author="Your Name" commit1..commit2 | awk 'NF==3 {plus+=$1; minus+=$2} END {printf("+%d, -%d\n", plus, minus)}'

but again, this is for one path (here 2 commits), not for all branches per branches.

Answer 3

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 4

On my repos I've gotten a lot of trash output from the one-liners floating around, so here is a Python script to do it right:

import subprocess
import collections
import sys


def get_lines_from_call(command):
    return subprocess.check_output(command).splitlines()

def get_files(paths=()):
    command = ['git', 'ls-files']
    command.extend(paths)
    return get_lines_from_call(command)

def get_blame(path):
    return get_lines_from_call(['git', 'blame', path])


def extract_name(line):
    """
    Extract the author from a line of a standard git blame
    """
    return line.split('(', 1)[1].split(')', 1)[0].rsplit(None, 4)[0]


def get_file_authors(path):
    return [extract_name(line) for line in get_blame(path)]


def blame_stats(paths=()):
    counter = collections.Counter()
    for filename in get_files(paths):
        counter.update(get_file_authors(filename))
    return counter


def main():
    counter = blame_stats(sys.argv[1:])
    max_width = len(str(counter.most_common(1)[0][1]))
    for name, count in reversed(counter.most_common()):
        print('%s %s' % (str(count).rjust(max_width), name))

if __name__ == '__main__':
    main()

Note that the arguments to the script will be passed to git ls-files, so if you only want to show Python files: blame_stats.py '**/*.py'

If you only want to show files in one subdirectory:blame_stats.py some_dir

And so on.

Answer 5

one line code(support time range selection):

git log --since=4.weeks --numstat --pretty="%ae %H" | sed 's/@.*//g' | awk '{ if (NF == 1){ name = $1}; if(NF == 3) {plus[name] += $1; minus[name] += $2}} END { for (name in plus) {print name": +"plus[name]" -"minus[name]}}' | sort -k2 -gr

explain:

git log --since=4.weeks --numstat --pretty="%ae %H" \
    | sed 's/@.*//g'  \
    | awk '{ if (NF == 1){ name = $1}; if(NF == 3) {plus[name] += $1; minus[name] += $2}} END { for (name in plus) {print name": +"plus[name]" -"minus[name]}}' \
    | sort -k2 -gr

# query log by time range
# get author email prefix
# count plus / minus lines
# sort result

output:

user-a: [phone]
user-b: [phone]

Answer 6

It's an old post but if someone is still looking for it:

install git extras

brew install git-extras

then

git summary --line

https://github.com/tj/git-extras