A formatter for the Ceylon programming language, written in Ceylon.
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Ceylon Formatter

Build Status

A source code formatter for the Ceylon programming language.

Current status

Version 1.3.3 has been released and is available on Herd. There are no immediate plans for changes; the next release will probably be for bugfixes, or to support new language features, or for a new binary version of Ceylon.


With ant

git clone https://github.com/eclipse/ceylon.formatter
cd ceylon.formatter
ant install

The buildfile assumes that ceylon-dist (including the Ceylon ant files) is a sibling folder; otherwise, you might have to adjust the paths in build.properties.

With the IDE

  1. Install the Ceylon IDE, following these instructions
  2. Clone the repository locally
  3. In Eclipse, go to File -> Import... -> Existing Projects into Workspace, then choose the location of the ceylon.formatter repository and import the ceylon.formatter project
  4. Run source_gen.ceylon.formatter.run() from the source-gen source folder (ignore the warning that the project has build errors, that’s exactly what this is going to fix)
  5. Right-click the test.ceylon.formatter module and choose Run As -> Ceylon Test to test if everything works

Restoring pre-1.3.3 history

Optionally, you can run the following command in your clone of the repository to restore older Git history:

git fetch origin 'refs/replace/*:refs/replace/*'


The formatter is part of the Ceylon IDE. You can format any source file by hitting Ctrl+Shift+F, or selecting Source > Format from the menu.

You can also run the formatter from the command line:

ceylon format source # to format all Ceylon code in source
ceylon format source --to source-formatted # if you’re afraid I might break your code – directory structure is preserved
ceylon format source test-source # to format all Ceylon code in source and test-source
ceylon format source --and test-source --to formatted # to format all Ceylon code in source and test-source into formatted

(Replace ceylon format with ceylon run ceylon.formatter if you don’t have the plugin installed.)


If you have found a bug or want to suggest a feature, create an issue. You can also send me an e-mail (address is on my Github page).


The content of this repository is released under the ASL v2.0 as provided in the LICENSE file that accompanied this code.

By submitting a "pull request" or otherwise contributing to this repository, you agree to license your contribution under the license mentioned above.