GitLab Merge Request Diff Counter

WHAT IT DOES GitLab Merge Request Diff Counter analyzes merge request diff pages and provides a comprehensive summary of changes. It counts the number of changed files, total additions, total deletions, and overall lines changed. A file type breakdown categorizes changes by type—backend, frontend, config, tests, docs, assets, and other—so you can quickly see which areas of the codebase are most affected. The tool displays a list of the most modified files with visual bar charts showing additions vs. deletions per file. It also calculates an overall change size (Small, Medium, Large, or Huge) based on total lines changed, giving you an instant sense of the merge request's scope. You can copy the summary to your clipboard as plain text or export the full data as JSON for further analysis. WHERE IT RUNS This script runs on GitLab merge request pages (*.gitlab.com/*). It operates entirely within your browser tab, reading the page's DOM to locate diff file containers, filename elements, and line statistics. The script cannot access other tabs, your browsing history, bookmarks, downloads, or any data outside the current page. All settings—including file type breakdown visibility, large change highlighting, max files to show, auto-analyze preference, and change size badge visibility—are stored locally using GM_setValue and never transmitted anywhere. HOW TO USE After installing with the BotGentz extension, the script automatically analyzes merge request diff pages you view (if auto-analyze is enabled). The panel shows a summary with file count, additions, deletions, and total changes. A change size badge (Small/Medium/Large/Huge) provides an at-a-glance assessment. The file type breakdown shows how many files and lines changed in each category. The "Most Changed Files" section lists the top files by total changes, with bar charts showing additions (green) and deletions (red). Click "Analyze Diff" to manually trigger analysis if auto-analyze is off. Use "Copy Summary" to copy a plain text report to your clipboard, and "Export JSON" to export the full structured data. Adjust settings to control which sections are displayed and how many files are shown. THE REAL MECHANISM The script detects diff file containers using multiple selectors (.diff-file, .file-holder, .diff-content, [data-testid="diff-file"]) to handle different GitLab versions and UI variations. For each file, it extracts the filename from .file-name or .diff-filename elements, and retrieves addition/deletion counts from .line-stats or .diff-stats elements using regular expressions to parse "+N" and "-N" patterns. If line stats aren't found, the script counts diff lines directly by checking for .added or .removed classes on individual line elements. The file type categorization uses a rule-based system that checks file extensions and path patterns to assign each file to a category (backend, frontend, config, tests, docs, assets, or other). The change size calculation is based on total lines changed with thresholds: Small (