Contributing

Organization

Source is contained in the src directory. There is roughly one Lua file for each class, though the operators are stored in their own files in the src/operators directory.

Tooling

There are a number of scripts in the tools folder that automate certain tasks. In general, they are run using lua tools/<file>.lua from the project root and take no arguments.

Everything in the src directory is concatenated into a single rx.lua file in the project root. The file tools/build.lua does this concatenation. It strips out both the requires at the top of files and the return values at the bottom.
- If you want to create a luvit build with additional features, you can run lua tools/build.lua luvit.
The documentation in doc/README.md is automatically generated based on comments in the source. The file tools/update_documentation.lua performs this generation. Internally it uses docroc, which is a library that parses Lua comments and returns them in a table. From here, update_documentation converts the table to markdown and writes it to the doc directory.
Currently, you should run both of these scripts and include an updated rx.lua and doc/README.md as part of a pull request. If you've added a new file you'll have to add it (alphabetized) to the file list in tools/build.lua.

Tests

Tests are recommended when adding new functionality. The reason is that they demonstrate correct behavior, provide a form of documentation, and protect against future bugs.
RxLua uses lust for testing.
To run the tests, run lua tests/runner.lua from the project root.
To run a specific test file, run lua tests/runner.lua average to just run the tests in tests/average.lua.
In addition to lust's default operators, there are also a few additional utilities available via runner.lua:
- expect(Observable).to.produce(...) will assert that the Observable produces the specified values, in order. If you need to assert against multiple values emitted by a single onNext, you can pass in a table (i.e. {{1, 2, 3}, {4, 5, 6}} to check that an Observable calls onNext twice with 3 values each).
- expect(Observable).to.produce.error() will assert that the Observable produces an error.
- There is also expect(Observable).to.produce.nothing().
- local onNext, onError, onCompleted = observableSpy(observable) will create three spies for each of the three events. You can read more about spies on lust's README.

Style

Aim for a consistent style.

Wrap lines to 100 characters.
Indent using two spaces.
Document functions using docroc syntax so documentation gets automatically generated. In general this means starting your first comment with three dashes, then using @arg and @returns.
Tend to avoid single line ifs (i.e. if condition then action end).
Files should end in a single trailing newline with no extra blank lines. This ensures that the base rx.lua file gets concatenated correctly.

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