#!/bin/bash

tags=($(git tag --sort=v:refname --merged | grep '^v' | grep -v "\-rc*"))

for ((i = 0; i < ${#tags[@]} - 1; i++)); do
        echo ${tags[i]}
done

if [ ${#tags[@]} -lt 2 ]; then
    echo "need 2 tag at lest"
    exit 1
fi

patch_dir="tag_patches"
mkdir -p "$patch_dir"

for ((i = 0; i < ${#tags[@]} - 1; i++)); do
    start_tag=${tags[i]}
    end_tag=${tags[i+1]}

    range_dir="${patch_dir}/${start_tag}..${end_tag}"
    mkdir -p "$range_dir"

    echo "Generating: $start_tag..$end_tag"

    git format-patch \
        -o "$range_dir" \
        --no-signature \
        --no-numbered \
        --start-number 1 \
        "${start_tag}..${end_tag}"

    find "$range_dir" -type f -name '*.patch' | while read -r file; do
        mv "$file" "${file%.patch}.txt"
    done
done

echo "End, saved to $patch_dir"`