Simplify new entry checking

.github/workflows/check-components-changelog.yml

@@ -41,51 +41,24 @@ jobs:
                     exit 1
                   fi
 
-                  changed_hunks=()
-                  while IFS= read -r range; do
-                    changed_hunks+=("${range}")
-                  done < <( \
-                    # Get CHANGELOG file changes
-                    git diff --unified=0 ${{ github.event.pull_request.base.sha }} HEAD "${changelog_path}" | \
-                    # Remove unwanted headers, meta, and specific change data
-                    grep -v -e '^[+-]' -e '^index' -e '^diff' | \
-                    # sed breakdown (statements are separated by `;`)
-                    # 1. Remove the @@ delimiters from all hunks of changes
-                    # 2. Remove the ` -` from the start of each line
-                    # 3. Remove the number of lines shown in each hunk
-                    # 4. Replace the ` +` with a `-` to show the range of lines changed
-                    sed 's/.*@@\(.*\)@@.*/\1/g; s/^ -//g; s/,[0-9]*//g; s/\(^[0-9]*\) +/\1-/g;' \
-                    )
-                    # Convert the ranges of changed lines to an array of individual line numbers
-                    changed_lines=()
-                    for range in "${changed_hunks[@]}"; do
-                      for (( i=${range%-*}; i<=${range#*-}; i++ )); do changed_lines+=("$i"); done
-                    done
+                  pr_link_pattern="\(\[#${PR_NUMBER}\]\(https://github\.com/WordPress/gutenberg/pull/${PR_NUMBER}\)\)"
+                  pr_link_grep_pattern="(\[#${PR_NUMBER}\](https://github\.com/WordPress/gutenberg/pull/${PR_NUMBER}))"
 
-                    # Find important header line numbers
-                    unreleased_header_line_no=$(grep -n -e '^## Unreleased' "${changelog_path}" | head -1 | sed -r 's/^([0-9]*):## Unreleased/\1/')
-                    release_header_pattern='## [0-9]*\.[0-9]*\.[0-9]* \([0-9]{4}-[0-9]{2}-[0-9]{2}\)'
-                    latest_release_header_line_no=$(grep -nE -e "^${release_header_pattern}$" "${changelog_path}" | head -1 | sed -r "s/^([0-9]*):${release_header_pattern}/\1/")
-                    # Find the line number of the current PR's entry in the changelog
-                    pr_link_pattern="\(\[#${PR_NUMBER}\]\(https://github\.com/WordPress/gutenberg/pull/${PR_NUMBER}\)\)"
-                    pr_link_grep_pattern="(\[#${PR_NUMBER}\](https://github\.com/WordPress/gutenberg/pull/${PR_NUMBER}))"
-                    current_pr_entry_line_no=$(grep -n -e "${pr_link_grep_pattern}" "${changelog_path}" | sed -r "s,^([0-9]*):-.*${pr_link_pattern}.*,\1,")
+                  unreleased_section=$(sed -n '/^## Unreleased$/,/^## /p' "${changelog_path}")
 
-                    # Confirm that there is an 'Unreleased' section and that the relevant entry is in that section
-                    if ! grep -nq -e '^## Unreleased' "${changelog_path}" || \
-                      { [[ -n "${current_pr_entry_line_no}" ]] && ! [[ \
-                        ${current_pr_entry_line_no} -gt ${unreleased_header_line_no} && \
-                        ${current_pr_entry_line_no} -lt ${latest_release_header_line_no} \
-                      ]]; }; then
-                        echo "Please make sure your CHANGELOG entry is in the \`## Unreleased\` section"
+                  # Confirm that the CHANGELOG has an entry for the current PR
+                  if ! grep -nq -e "${pr_link_grep_pattern}" "${changelog_path}"; then
+                      echo "Please make sure your CHANGELOG entry has a link to the current PR."
+                      echo
+                        echo "${optional_check_notice}"
                       exit 1
-                    fi
+                  fi
 
-                    # Confirm that there is an entry with the right PR link it's part of the current changes
-                    if ! ( grep -nq -e "${pr_link_grep_pattern}" "${changelog_path}" \
-                      && echo "${changed_lines[@]}" | grep -qw "$current_pr_entry_line_no" ); then
-                        echo "Please make sure your CHANGELOG entry has a link to the current PR."
-                        echo
-                        echo "${optional_check_notice}"
-                        exit 1
-                    fi
+                  # Confirm that there is an 'Unreleased' section and that the relevant entry is in that section
+                  if ! grep -nq -e '^## Unreleased' "${changelog_path}" || \
+                    ! [[ $unreleased_section = *${pr_link_pattern}* ]]; then
+                      echo "Please make sure your CHANGELOG entry is in the \`## Unreleased\` section"
+                      echo
+                      echo "${optional_check_notice}"
+                      exit 1
+                  fi