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# Contribution Guide
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You shouldn't edit the node class files (all files under `diagrams/` directory) by
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yourself.
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## Resources
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### Update nodes
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All node classes was auto-generated from image resource files. For example, the
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`diagram.aws.compute.EC2` class was auto-generated based on
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`resources/aws/compute/ec2.png` image resource file.
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So, if you want to add new node resources or update existing node resources, you
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can just add or update the image files in `resources/<provider>/<type>/<image>`.
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Images should be resized to fit a maximum of 256 pixels wide or high.
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```shell
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# You can do that easily with ImageMagick
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convert -resize 256 my_big_image.jpg my_image.jpg
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# Or FFmpeg
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ffmpeg -i my_big_image.jpg -vf scale=w=256:h=256:force_original_aspect_ratio=decrease my_image.png
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```
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Then just run the `./autogen.sh` to generate the added or updated node classes.
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> IMPORTANT NOTE: To run `autogen.sh`, you need [round][round] and
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> [inkscape][inkscape] command lines that are used for clearning the image
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> resource filenames.
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>
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> macOS users can download the inkscape via Homebrew.
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[round]: https://github.com/mingrammer/round
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[inkscape]: https://inkscape.org/ko/release
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### Update Aliases
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Some node classes have alias. For example, `aws.compute.ECS` class is an alias
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of `aws.compute.ElasticContainerService` class. Aliases also were auto-generated
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from `ALIASES` map in [config.py](config.py).
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So, if you want to add new aliases or update existing aliases, you can just add
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or update the `ALIASES` map in [config.py](config.py).
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Then just run the `./autogen.sh` to generate the added or updated aliases.
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> IMPORTANT NOTE: To run `autogen.sh`, you need [round][round] and
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> [inkscape][inkscape] command lines that are used for clearning the image
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> resource filenames.
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## Run Tests
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```shell
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python -m unittest tests/*.py -v
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```
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## Testing changes to the website
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The [Docusaurus](https://docusaurus.io/)-based documentation website can be run by installing dependencies, then simply running `npm run start`.
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```bash
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cd website/
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npm i
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npm run start
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```
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The website will be available on [http://localhost:3000](http://localhost:3000).
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Edit files in `website/` and `docs/` respectively to edit documentation.
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