Feature: new mbtiles diff command

[sharkAndshark]

Implement mbtiles diff file_a.mbtiles file_b.mbtiles diff.mbtiles. This should behave exactly the same as mbtiles copy file_a.mbtiles --diff-with-file file_b.mbtiles diff.mbtiles.

• Add mbtiles diff as a separate command
• Update doc

[nyurik]

good luck, a fun little project :) I left a few minor comments, but i'm sure lots will change by the end

[nyurik]

I just did a bit of refactoring to separate Clap args from the internals of the mbtiles copy options. You could simply reuse that directly, without any changes to the diff. This way the new CLI command will be available right away, and then we can do more refactorings later.

[nyurik]

@sharkAndshark i merged in the main branch, resolving a few conflicts. Let me know if you need any help with this

[sharkAndshark]

@nyurik Thx!! :D Traveling with family, will be back Monday

[nyurik]

Looks much better, thx! TODO: docs and tests

[nyurik]

looking better and better. For testing, please also add another portion to https://github.com/maplibre/martin/blob/main/tests/test.sh#L456

Something basic like

  $MBTILES_BIN diff \
    ./tests/fixtures/mbtiles/world_cities.mbtiles \
    ./tests/fixtures/mbtiles/world_cities_modified.mbtiles \
    "$TEST_TEMP_DIR/world_cities_diff2.mbtiles" \
    2>&1 | tee "$TEST_OUT_DIR/copy_diff2.txt"

[nyurik]

Thanks! I think its ready to go.