Git scripts

git-rank

#!/bin/sh

# Contributor Ranking
#
# Author: Tom Cammann, Heath Stewart
#

optspec=":eh-:"
ext="cs|cpp|h"

while getopts "$optspec" optchar; do
    case "${optchar}" in
        -)
            case "${OPTARG}" in
                extension)
                    ext="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
                    ;;
                extension=*)
                    ext=${OPTARG#*=}
                    ;;
                *)
                    if [ "$OPTERR" == 1 ] && [ "$optspec:0:1}" != ":" ]; then
                        echo "Error: unknown option --${OPTARG}" >&2
                        exit 1
                    fi
                    ;;
            esac;;
        e)
            ext="${!OPTIND}"; OPTIND=$(( $OPTIND + 1 ))
            ;;
        h)
            echo "Usage: $0 [-h] [-e|--extension[=]<e1|e2|...>]" >&2
            exit 2
            ;;
        *)
            if [ "$OPTERR" != 1] || [ "${optspec:0:1}" == ":" ]; then
                echo "Error: unknown argument: '-${OPTARG}'" >&2
                exit 1
            fi
            ;;
    esac
done

if [ "$ext" == "" ]; then
    echo "Error: one or more extensions delimited by '|' required"
    exit 1
fi

function contrib_list {
    # Find all email address names used to commit
    authors=$( git log --format='%aE' | cut -d"@" -f1 | sort -u )

    # For each commit match no binary files that have changed and capture the number
    for i in ${authors}; do
        echo "$i" $(git log --author="$i" --no-merges --stat | awk 'BEGIN{ FS="|" } /.*\.('$ext')/{match($2, /^ *([0-9]+)/, a); changes += a[1]; commits += 1 } END { print changes " " commits }')
    done
}

# Create a mapping from username to commit lines
# Add different cases of names together.
n=1
for i in $(contrib_list |  awk '
BEGIN{ FS=" " }
{ a[tolower($1)]["changes"] += $2; a[tolower($1)]["commits"] += $3 }
END {
    for( name in a ) {
        avg = 0
        if (a[name]["commits"]) {
            avg = a[name]["changes"]/a[name]["commits"]
        }

        print name "_" a[name]["changes"] "_changes_in_" a[name]["commits"] "_commits_(" avg "_changes/commit_average)"
    }
}' | sort -t"_" -k2 -rn); do
x=$( echo $i | tr "_" " ")
echo "${n}. $x"
(( n++ ))
done