list new contributors for a git branch (given a previous list)

contributors.sh

#!/bin/sh

aliases=(aheadley Andrew "Two Words" "<mail@example.com>")

if [ $# -gt 0 ]; then
        branch=$1
else
        branch=master
fi

echo contributors in $branch:

# contributors with name and email
# sorted on last part of the name
git shortlog -se $branch \
        | awk '{ print $(NF-1), $0 }' | sort \
        | while read line;
do
        orig_line=`echo $line | awk '{ $1=""; print $0 }'`
        count=`echo $orig_line | awk '{ print $1 }'`
        name=`echo $orig_line | awk '{
                for (i=2; i<=NF-1; i++) {
                        if (i>2) printf(" ")
                        printf("%s", $i)
                }
                }'`
        email=`echo $orig_line | awk '{ print $NF }'`

        # don't show known aliases
        for alias in "${aliases[@]}"; do
                if [ "$name" = "$alias" ]; then
                        continue 2
                fi
                if [ "$email" = "$alias" ]; then
                        continue 2
                fi
        done
        grep -q "$email" CONTRIBUTORS.rst
        if [ $? -ne 0 ]; then
                printf "%3d %25s %s\n" $count "$name" "$email"
        fi
done