draft_release.yml

###########################################################
#             Author: xZetsubou aka Bander                #
#                                                         #
# Generate draft release of commits since latest version. #
###########################################################

name: Generate Draft Release

on:
  push:
    workflow_dispatch:
    branches:
      - master

permissions:
  contents: write

env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  release_commits: |
      {"section": "breaking_changes",    "prefix": "break",    "header": "💥 Breaking Changes"}
      {"section": "fixes",               "prefix": "fix",      "header": "🐛 Fixes"           }
      {"section": "feats",               "prefix": "feat",     "header": "✨ Feats"           }
      {"section": "improvements",        "prefix": "perf",     "header": "⚡ Improvements"    }
      {"section": "refactors",           "prefix": "refactor", "header": "♻️ Refactors"       }
      {"section": "chores",              "prefix": "chore",    "header": "🧹 Chores"          }
      {"section": "docs",                "prefix": "doc",      "header": "📚 Docs"            }
      {"section": "revert",              "prefix": "revert",   "header": "🌀 Reverts"         }
      {"section": "cis",                 "prefix": "ci",       "header": "🛠️ CI"              }
      {"section": "tests",               "prefix": "test",     "header": "✅ Tests"           }
      {"section": "more",                "prefix": "",         "header": "➕ More"            }

jobs:
  generate-release-draft:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0  # Fetch all tags and history

      - name: Get latest release tag
        id: latest-release
        run: |
          latest_tag=$(curl --silent --fail \
            -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
            "https://api.github.com/repos/${{ github.repository }}/releases/latest" \
            | jq -r .tag_name)
          echo "Latest release tag: $latest_tag"
          echo "latest_tag=$latest_tag" >> $GITHUB_ENV

      - name: Get commits from latest release to HEAD
        run: |
          git fetch --tags
          git log ${{ env.latest_tag }}..HEAD --pretty=format:'%s by @%an,%ae,%cL in [`%h`](https://github.com/${{github.repository}}/commit/%H)' --reverse > commits.md
          echo "" >> commits.md

          declare -A cache_nickname;
          while IFS= read -r line; do
                    author_info=$(echo "$line" | grep -oP 'by @\K.*?(?= in)')
                    commit=$(echo "$line" | grep -oP '/commit/\K[a-f0-9]+')
                    IFS=$',' read -r name email mail_name _ <<< "$author_info"

                    if [[ "$email" != *"noreply"* ]]; then
                      if [[ -v cache_nickname[$email] ]]; then
                        username="${cache_nickname[$email]}"
                      else
                        username=$(curl --silent --fail \
                                  -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
                                  "https://api.github.com/search/commits?q=$commit" \
                                  | jq -r '.items[0].author.login')
                        cache_nickname[$email]=$username
                      fi
                      if [[ $username != null ]]; then
                        sed -i "s#$author_info#$username#g" "commits.md"
                        continue
                      fi
                    fi

                    if [[ "$email" =~ (^[0-9]+)?\+?([a-zA-Z0-9]+)@ ]]; then
                      id="${BASH_REMATCH[1]}"; mail_name="${BASH_REMATCH[2]}";
                      username=$name && [[ -n $id ]] && username=$mail_name
                    fi
                    sed -i "s#$author_info#$username#g" "commits.md"
          done < commits.md

          
      - name: Parse commit messages and categorize
        id: parse_commits
        run: |
          declare -A commits_map;
          while IFS= read -r line; do
            first_lower=$(echo "$line" | awk '{print $1}' | tr '[:upper:]' '[:lower:]')
            scope=$(echo "$line" | cut -d' ' -f1)
            commit_desc=$(echo "$line" | cut -d' ' -f2-)

            parsed_commit="- **$scope** $commit_desc\n"

            added=false
            while read -r item; do
              section=$(echo "$item"  | jq -r '.section')
              prefix=$(echo "$item"   | jq -r '.prefix')

              if [[ "$first_lower" == $prefix*: ]]; then
                commits_map[$section]+=$parsed_commit && added=true && break
              fi
            done < <(echo '${{env.release_commits}}')
            [[ $added == false ]] && commits_map["more"]+=$parsed_commit

          done < commits.md

          for key in "${!commits_map[@]}"; do
            echo "$key=${commits_map[$key]}" >> $GITHUB_OUTPUT
          done


      - name: Create Release Notes
        id: release-notes
        run: |
          notes="#### 🚨 **Note**: This draft has been released in $(date +'%Y.%m.%d - %H:%M:%S')\n\n"

          while read -r item; do
            section=$(echo "$item"  | jq -r '.section') && [[ ! "$section" =~ [^[:space:]] ]] && continue
            header=$(echo "$item"   | jq -r '.header') 

            [[ ! "$section" =~ [^[:space:]] ]] && continue

            section_commits=$(echo '${{ toJson(steps.parse_commits.outputs) }}' | jq -r ".$section")

            if [ -n "$section_commits" ] && [ "$section_commits" != null ]; then
              notes+="### $header \n $section_commits \n"
            fi
          done < <(echo '${{env.release_commits}}')

          echo -e $notes > commits.md

      - name: Remove old Draft
        id: remove_drafts
        continue-on-error: true
        run:
          gh release delete "Draft Latest version"

      - name: Create Release Draft
        uses: softprops/action-gh-release@v1
        with:
          name: "Draft Latest version"  
          tag_name: "Draft Latest version"  
          body_path: commits.md 
          draft: true