Generate git tags from version in setup.py over git history. Tags: PyPI, Bash, Git Tag

generate_tags.sh

#!/usr/bin/env bash

n=0
while git cat-file -t HEAD~$n &>/dev/null; do
    ver="$(git show "HEAD~${n}:setup.py" | grep -oP "(?<=version=\')[0-9\.]+(?=\')")"
    [ -z "$ver" ] || git tag -fa "_generated-v$ver" -m "v$ver" "HEAD~$n"; n=$((n+1))
done

for i in $(git tag | grep -F '_generated-'); do
    tag_name=${i/_generated-/}
    correct_sha=$(git rev-list -1 "$i")
    if [ "$correct_sha" != "$(git rev-list -1 "$tag_name" 2>/dev/null)" ]; then
        git tag -fa "$tag_name" -m "$tag_name" "$correct_sha"
    fi
    git tag -d "_generated-$tag_name"
done