feat(workflow): Integrate CHANGELOG generation into release action

- Merge changelog update logic directly into the workflow file
- Remove separate update_changelog.sh script
- Improve function order and variable definitions in the script
- Ensure proper handling of existing changelog entries
- Maintain compatibility with existing release creation/update steps

Author: joshuadanpeterson

.github/workflows/release.yml

@@ -124,21 +124,79 @@ jobs:
       - name: Update CHANGELOG.md
         shell: bash
         run: |
-          # Set execute permissions
-          chmod +x $GITHUB_WORKSPACE/.github/scripts/update_changelog.sh
-
-          # Convert line endings
-          sed -i 's/\r$//' $GITHUB_WORKSPACE/.github/scripts/update_changelog.sh
-
-          # Set variables
           NEW_VERSION='${{ steps.determine_version.outputs.NEW_VERSION }}'
           CHANGELOG=$(cat << 'EOF'
           ${{ steps.get_changelog.outputs.CHANGELOG }}
           EOF
           )
 
-          # Run the update changelog script
-          $GITHUB_WORKSPACE/.github/scripts/update_changelog.sh "$NEW_VERSION" "$CHANGELOG"
+          CURRENT_DATE=$(TZ='America/Denver' date +%Y-%m-%d)
+          REPO_URL="https://github.com/joshuadanpeterson/typewriter.nvim"
+
+          format_entry() {
+            local version=$1
+            local date=$2
+            local content=$3
+            local prev_version=$4
+            echo "## [$version]($REPO_URL/tree/$version) ($date)"
+            echo "$content"
+            echo
+            echo "[Full Changelog]($REPO_URL/compare/$prev_version...$version)"
+            echo
+          }
+
+          remove_duplicates() {
+            echo "$1" | awk '!seen[$0]++'
+          }
+
+          echo "# Changelog" > temp_changelog.md
+          echo >> temp_changelog.md
+
+          # Add new version
+          NEW_CHANGELOG=$(remove_duplicates "$CHANGELOG")
+          format_entry "$NEW_VERSION" "$CURRENT_DATE" "$NEW_CHANGELOG" "${{ steps.determine_version.outputs.LATEST_TAG }}" >> temp_changelog.md
+
+          prev_version="$NEW_VERSION"
+          declare -A processed_versions
+
+          while IFS= read -r line; do
+            if [[ $line =~ ^##[[:space:]]+(\[v[0-9]+\.[0-9]+\.[0-9]+\])(.*)$ ]]; then
+              version="${BASH_REMATCH[1]}"
+              version="${version:1:-1}"
+              if [[ -n "${processed_versions[$version]}" ]] || [[ "$version" == "$NEW_VERSION" ]]; then
+                continue
+              fi
+              processed_versions[$version]=1
+
+              date_part="${BASH_REMATCH[2]}"
+              date=$(echo "$date_part" | grep -oP '\(\K[0-9]{4}-[0-9]{2}-[0-9]{2}(?=\))' || echo "Unknown Date")
+              
+              if [ "$date" != "Unknown Date" ]; then
+                date=$(TZ='America/Denver' date -d "$date" +%Y-%m-%d)
+              fi
+              
+              content=$(sed -n "/^## \[$version\]/,/^## \[v[0-9]/{ /^## \[v[0-9]/d; p; }" CHANGELOG.md)
+              content=$(echo "$content" | sed '/^\[Full Changelog\]/d' | sed '/^$/N;/^\n$/D')
+              content=$(remove_duplicates "$content")
+              
+              format_entry "$version" "$date" "$content" "$prev_version" >> temp_changelog.md
+              
+              prev_version="$version"
+            fi
+          done < CHANGELOG.md
+
+          mv temp_changelog.md CHANGELOG.md
+
+          if ! grep -q "^# Changelog" CHANGELOG.md || ! grep -q "^## \[v[0-9]\+\.[0-9]\+\.[0-9]\+\]" CHANGELOG.md; then
+            echo "Error: CHANGELOG.md formatting verification failed"
+            exit 1
+          fi
+
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git add CHANGELOG.md
+          git commit -m "docs: update CHANGELOG.md for ${NEW_VERSION} and remove duplicate entries"
+          git push
 
       - name: Check if release exists
         id: check_release