Pipe all commit messages per-author through wc and such to get wordiness by user.

git-wordiness

#!/bin/bash

set_order () {
        local oarg="$1"
        case "$oarg" in
        commits|c)
                 order=1
                 ;;
        lines|l)
                order=2
                ;;
        words|w)
                order=3
                ;;
        bytes|b)
                order=4
                ;;
        name|n)
                order=5
                ordertype='-d'
                ;;
        *)
                printf "unrecognized ordering '%s'\n" "$oarg" 1>&2
                exit 1
                ;;
        esac
}

print_help () {
    wrip -s -l=2 -i=0 -w="${COLUMNS:-80}" <<HELPTXT
git-wordiness [OPTIONS]

List general sums about commit messages (i.e., wc output).

OPTIONS
-csv
    Output results in comma-separated value format.
-tsv
    Output results in tab-separated value format.
-order=ORDER
    Set the output ordering to one of the following:
     - commits|c  :: Order by total commits.
     - lines|l    :: Order by lines used in all commit messages (does not unbreak paragraphs).
     - words|w    :: Order by total words used in all commit messages.
     - bytes|b    :: Order by bytes used for all commit messages.
     - name|n     :: Order by committer name.
-r|-reverse
    Reverse the output order.
HELPTXT
}

fmt='%10s %10s %10s %10s %s\n'
head=1
order=1
ordertype='-n'
reverse='cat'
sep=' '
logargs=(--all)
while [[ $# -gt 0 ]] ; do
        arg="$1"
        shift
        case "$arg" in
        -h|-help|--help)
                print_help 1>&2
                exit 0
                ;;
        -c|-csv|--csv)
                fmt='%s,%s,%s,%s,%s\n'
                sep=','
                ;;
        -t|-tsv|--tsv)
                fmt='%s\t%s\t%s\t%s\t%s\n'
                sep="$(printf '\t')"
                ;;
        -order=*) set_order "${arg#-order=*}" ;;
        --order=*) set_order "${arg#--order=*}" ;;
        -o?) set_order "${arg:2}" ;;
        -r|-reverse|--reverse) reverse='tail -r' ;;
        -nh|-nohead|--nohead) head=0 ;;
        --)
                logargs=("$@")
                break
                ;;
        *)
                logargs=("$arg" "$@")
                break
                ;;
        esac
done

logquote="$(if [[ "${#logargs[@]}" -gt 0 ]] ; then printf ' %q' "${logargs[@]}" ; fi)"

export fmt
if [[ $head == 1 ]]
then
        printf "$fmt" COMMITS LINES WORDS BYTES NAME
fi
git log --pretty='%aN' "${logargs[@]}" |
        sort |
        uniq |
        xargs -I @@ \
                env NAME=@@ \
                env REGEX='^@@ <' \
                bash -c 'printf "$fmt" $(git log '"$logquote"' --use-mailmap --pretty="%H" --author="$REGEX" | wc -l)  $(git log '"$logquote"' --use-mailmap --pretty="%B" --author="$REGEX" | wc) "$NAME"' | \
        sort -b $ordertype -k "+${order}n" |
        $reverse

# FIXME: Names with non-ASCII characters can throw-off alignment of columns.