clang‐format updates

https://github.com/XRPLF/rippled/pull/5157

For branches using clang-format versions prior to 18, it is necessary to make changes to update for clang-format-18.

Instructions:

1. confirm the commit sha with changes in .clang-format settings

$ git log develop --oneline --graph
. . . 
* decb3c178e Update clang-format settings
. . .

2. cherry pick this one commit on your branch (with signature)

$ git cherry-pick decb3c178e -S

3. confirm the instruction (from develop) to reformat the sources files

$ git show develop:.github/workflows/clang-format.yml | grep find | head -1
run: find include src -type f \( -name '*.cpp' -o -name '*.hpp' -o -name '*.h' -o -name '*.ipp' \) -exec clang-format-${CLANG_VERSION} -i {} +

4. make sure your clang-format is version 18.1.3 (and only this version; e.g. 18.1.6 will reformat the sources differently)

$ clang-format --version
Ubuntu clang-format version 18.1.3 (1ubuntu1)

5. reformat source files in your branch with clang-format 18.1.3 and updated settings

$ find include src -type f \( -name '*.cpp' -o -name '*.hpp' -o -name '*.h' -o -name '*.ipp' \) -exec clang-format -i {} +

6. commit new formatting (with signature)

$ git commit -m "Reformat code with clang-format-18" -S -i include/ src/

7. actually merge develop into your branch. should merge cleanly.

$ git merge --no-ff develop -S

If you have the pre-commit hook on your machine, after you have brought both .clang-format and .pre-commit-config.yaml up-to-date with develop (e.g. you have merged with or rebased on develop), you can just run: pre-commit run --all-files

The earlier instructions are still useful if merging is tricky because your sources haven't been reformatted yet.

credit to Bronek.