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Map Merge 2

Map Merge 2 is an improvement over previous map merging scripts, with better merge-conflict prevention, multi-Z support, and automatic handling of key overflow. For up-to-date tips and tricks, also visit the Map Merger wiki article.

What Map Merging Is

The "map merge" operation describes the process of rewriting a map file written by the DreamMaker map editor to A) use a format more amenable to Git's conflict resolution and B) differ in the least amount textually from the previous version of the map while maintaining all the actual changes. It requires an old version of the map to use as a reference and a new version of the map which contains the desired changes.

Installation

To install Python dependencies, run requirements-install.bat, or run python -m pip install -r requirements.txt directly. See the Git hooks documentation to install the Git pre-commit hook which runs the map merger automatically, or use tools/mapmerge/Prepare Maps.bat to save backups before running mapmerge.bat.

For up-to-date installation and detailed troubleshooting instructions, visit the Map Merger wiki article.

Code Structure

Frontend scripts are meant to be run directly. They obey the environment variables TGM to set whether files are saved in TGM (1) or DMM (0) format, and MAPROOT to determine where maps are kept. By default, TGM is used and the map root is autodetected. Each script may either prompt for the desired map or be run with command-line parameters indicating which maps to act on. The scripts include:

  • convert.py for converting maps to and from the TGM format. Used by tgm2dmm.bat and dmm2tgm.bat.
  • mapmerge.py for running the map merge on map backups saved by Prepare Maps.bat. Used by mapmerge.bat

Implementation modules:

  • dmm.py includes the map reader and writer.
  • mapmerge.py includes the implementation of the map merge operation.
  • frontend.py includes the common code for the frontend scripts.

precommit.py is run by the Git hooks if installed, and merges the new version of any map saved in the index (git added) with the old version stored in Git when run.