Retrospectively tag releases from setup.py commits

tag.sh

#!/bin/bash
for version_line in $(git log -G 'version=' setup.py | grep commit | awk '{print $2}' | \
                      xargs git show --date=iso | \
                      grep -E '^((\+\s*version=)|(commit )|Date:)' | \
                      sed "s/\+\s*version='//" | sed "s/',$//" | \
                      sed 's/commit //' | \
                      sed 's/Date:\s*//' | \
                      awk '{printf("%s%s", $0, (NR%3 ? "," : "\n"))}' | \
                      sed 's/ /_/g'); do
    c="$(echo $version_line | awk -F ',' '{print $1}')"
    GIT_COMMITTER_DATE="$(echo $version_line | awk -F ',' '{print $2}' | sed 's/_/ /g' | sed 's/ \+\d+//')"
    v="$(echo $version_line | awk -F ',' '{print $3}')"
    GIT_COMMITTER_DATE="$GIT_COMMITTER_DATE" git tag -a "v$v" -m "Version $v (retrospectively tagged)" $c
done