Contributing to the Manual (manual is unmaintained in `tabularray-dev`)

You need to compile the manual files with LuaLaTeX, because it is rather slow to compile them with XeLaTeX or PDFLaTeX.
The manual tabularray.tex is split into subfiles and put in manual folder. You can compile each subfile and see the output.
Now you can create a pull request for your contribution.

Contributing to the Code

Preparation
- Install l3build LaTeX package.
- Install pdftoppm program.
  - Windows: tlmgr install wintools.windows
  - Ubuntu: apt-get install poppler-utils
  - macOS: brew install poppler
- (optional) Install ImageMagick.
  - Windows: see https://imagemagick.org/script/download.php#windows
  - Ubuntu: apt-get install imagemagick
  - macOS: brew install imagemagick
Run tests
- In the root dir, run l3build check to check all tests.
- Then in ./tabularray, run texlua buildend.lua to PDF output of testfiles-old tests, by comparing md5 of images converted from PDF page by page.
  - This uses a local ./support/ppmcheckpdf.lua, instead of the one provided by ppmchecmpdf CTAN package.
  - On non-Windows systems, when ImageMagick is installed (by checking existence of magick or compare), .diff.png diff images are created (under ./build/test/config-old) for failed tests.
- See also steps in ./.github/workflows/check.yml.
Update test results
- In ./tabularray or ./zutil, run l3build save [-c<config>] [-e<engine>] <name>... to update corresponding testfiles/<name>.[<engine>.]tlg file(s). Then check if the updates are expected.
  - Consult the l3build doc for more info.
- In ./tabularray, after l3build check -cconfig-old passes, run texlua buildend.lua save to update all testfiles/*.{png,md5} files which failed the ppm check. Then check if the updated .png are expected.