2.8 KiB
Contributing
Issues (bugs, feature requests or otherwise feedback) may be reported in the GitHub issue tracker for this project. Pull requests are also welcome.
When contributing to this repository, please first discuss the change you wish to make via an issue, unless it's entirely trivial (typo fixes, etc.). If there is already an issue that describes the change you have in mind, comment on it indicating that you're going to work on that. This way we can avoid the situation when several people work on the same thing.
Please make sure that all non-trivial changes are described in commit messages and PR descriptions.
What to hack on?
- Fixing bugs. This is the main focus right now.
Implementing rendering of AST
The Ormolu.Printer.Combinators module provides a DSL for rendering of GHC
AST. You'll probably only need this one module for writing new rendering
functions. The module documents how to use the printing combinators it
provides. Consult the Haddocks to learn more about them.
Create new modules corresponding to the things you want to render under
Ormolu.Printer.Meat. For example, there are Ormolu.Printer.Meat.Type and
Ormolu.Printer.Meat.Declaration.Data.
Concrete rendering functions get their names by appending p_ to the name
of the type which describes a particular part of AST. For example, the
function for rendering types is correspondingly:
p_hsType :: HsType GhcPs -> R ()
In general rendering functions like this take 1 or more arguments and
produce R () which is a rendering action.
Testing
Testing has been taken good care of and now it amounts to just adding
examples under data/examples. Each example is a pair of files:
<example-name>.hs for input and <example-name>-out.hs for corresponding
expected output.
Testing is performed as following:
- Given snippet of source code is parsed and pretty-printed.
- The result of printing is parsed back again and the AST is compared to the AST obtained from the original file. They should match.
- The output of printer is checked against the expected output.
- Idempotency property is verified: formatting already formatted code results in exactly the same output.
Examples can be organized in sub-directories, see the existing ones for inspiration.
CI
We use Circle CI. Some outside contributors may have problems, as in, CI won't run for PRs opened from forks with “unauthorized” errors. In that case the best we can do is to add you as a contributor or to restart your build manually.
If you have been added as a contributor but the builds still do not start, try clicking
User settings -> Account integrations -> Refresh permissions
in Circle CI app.