#!/bin/zsh

zmodload zsh/stat
set -e

if ! ${git} diff --exit-code > /dev/null || ! ${git} diff --staged --exit-code  > /dev/null ; then
    echo 'Your working directory contains local modifications!' >&2
    exit 1
fi

base=${1:-HEAD}
save=$(git rev-parse HEAD)

function reset() {
    git reset --quiet --hard $save
    rm -f bundle.gz
}

trap reset ERR EXIT KILL TERM INT

for c in $(git log --pretty='%h' --first-parent cgal/master..$base); do
    git reset --quiet --hard $c
    git bundle create bundle $(git rev-parse ${c}\^)..HEAD > /dev/null 2>&1
    gzip -f bundle
    size=${(l:4:)$(( $(zstat +size bundle.gz) / 1024 ))}
    git show --no-patch --pretty='%C(auto)%h (SIZE: %C(auto)'"${size}kB)"'  %s <%an> %cD' $c
    parents=(${(@)$(git rev-parse $c^@)})
    if ! [ ${#${parents:1}[@]} -eq 0 ]; then
        git show --no-patch --pretty='  merge: %h%C(auto)% d' ${parents:1}
    fi
done
last=$c

[ -n "$last" ] && git log -1 --pretty='Base commit: %C(auto)%h %d' ${last}'~'