Generate changlog from last 2 tags of a gGIT repository

changelog.sh

#! /bin/bash

git pull --all # fetch last changes from all branches
git pull --tags # fetch all tags

# switch to prod:
git checkout prod

#git tag # display tags

# generate changelog:
#git log 0.4.9.1...0.4.10 --pretty=format:"%ad: %s" --date=short

# get all tags sorted:
#git for-each-ref --sort=taggerdate --format '%(refname) %(taggerdate)' refs/tags
#git for-each-ref --sort=-taggerdate --format '%(refname) %(taggerdate)' --count=2 refs/tags

# get last tag and date:
echo "# Changelog"
echo -n "## Release: "
git for-each-ref --sort=-taggerdate --format '%(refname) %(taggerdate)' --count=1 refs/tags

last_tag=`git for-each-ref --sort=-taggerdate --format '%(refname) %(taggerdate)' --count=1 refs/tags | awk '{print $1}' | sed 's/refs\/tags\///'`
#echo $last_tag

previous_tag=`git for-each-ref --sort=-taggerdate --format '%(refname) %(taggerdate)' --count=2 refs/tags | tail -1 | awk '{print $1}' | sed 's/refs\/tags\///'`
#echo $previous_tag

echo "Generating changelog from $previous_tag to $last_tag:"

git log $previous_tag...$last_tag --pretty=format:"%ad: %s" --date=short