generate_release_notes.sh

#!/bin/bash

# export AUTH_TOKEN="your-github-token"
REPO_OWNER="project-koku"
REPO_NAME="koku"
RELEASE_HASH="725c0c053eafe7ac36ecb7b73282b9f744eb0957"
BOILERPLATE="This includes bug fixes and performance enhancements. For more detailed information see below"

# Function to fetch commit details
fetch_commit_details() {
    commit_sha=$1
    curl -s -H "Authorization: token $AUTH_TOKEN" "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/commits/$commit_sha"
}

# Function to process commit message
process_commit_message() {
    commit_details=$1
    merge_msg_pattern='\(#\d+\)'
    jira_link_pattern='s/\[COST-([0-9]+)\]/[COST-\1](https:\/\/issues.redhat.com\/browse\/COST-\1)/g'
    github_pr_link="s/\(#([0-9]+)\)/[\1](https:\/\/github.com\/$REPO_OWNER\/$REPO_NAME\/pull\/\1)/g"
    filtered_message=$(echo "$commit_details" | jq -r '.commit.message' | grep -E "$merge_msg_pattern" | sed '/^$/d' | sed -E "$jira_link_pattern;$github_pr_link")
    echo "$filtered_message"
}

# Grab latest_release & format commit messages
latest_response=$(curl -s -H "Authorization: token $AUTH_TOKEN" "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/releases/latest")
latest_tag_name=$(echo "$latest_response" | jq -r '.tag_name')
latest_commit_sha=$(echo "$latest_response" | jq -r '.target_commitish')
commit_list=$(curl -s -H "Authorization: token $AUTH_TOKEN" "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/compare/$latest_commit_sha...HEAD" | jq -r '.commits[].sha')
commit_messages=()
customer_impact=()
for commit_sha in $commit_list; do
    commit_details=$(fetch_commit_details "$commit_sha")
    filtered_message=$(process_commit_message "$commit_details")
    commit_messages+=("$filtered_message")
    pr_number=$(echo "$filtered_message" | grep -oE '\[[0-9]+\]' | grep -oE '[0-9]+')
    labels=$(curl -s -H "Authorization: token $AUTH_TOKEN" "https://api.github.com/repos/$REPO_OWNER/$REPO_NAME/issues/$pr_number" | jq -r '.labels[].name')
    if [[ "$labels" =~ "customer-impact" ]]; then
        customer_impact+=("$filtered_message")
    fi
done

## Build the release notes

echo "### Whats Changed" >> release_body.md
echo "$BOILERPLATE" >> release_body.md

if [ ${#customer_impact[@]} -gt 0 ]; then
    echo "## TODO: Summarize the following" >> release_body.md
    echo "The issues below need to be added to the summary above in greater detail." >> release_body.md
    echo "1. Summarize the issue and describe what we did" >> release_body.md
    echo "2. Any impacted urls" >> release_body.md
    echo "3. Update jiras & PR description with relevant information" >> release_body.md
    for commit_message in "${customer_impact[@]}"; do
        echo "* $commit_message" >> release_body.md
    done
fi

echo "" >> release_body.md

if [ ${#commit_messages[@]} -gt 0 ]; then
    echo "## Change History" >> release_body.md
    for commit_message in "${commit_messages[@]}"; do
        echo "* $commit_message" >> release_body.md
    done
fi

today=$(date +"%Y.%m.%d")
prev_release=$(git tag --list | tail -1)
prev_date="${prev_release%.*}"
minor_version=0

case $prev_date in
    *"$today"*)
        minor_version=${prev_release##*.}
        minor_version=$((minor_version+1))
        ;;
    *)
        minor_version=0
        ;;
esac

this_release_tag="r.$today.$minor_version"

echo "" >> release_body.md
echo "**Full Changelog**: https://github.com/project-koku/koku/compare/$latest_tag_name...$this_release_tag" >> release_body.md