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Supported languages and themes

To list the supported languages and color themes, use delta --list-languages and delta --list-syntax-themes. To see a demo of the color themes, use delta --show-syntax-themes:

To add your own custom color theme, or language, please follow the instructions in the Customization section of the bat documentation:

Delta automatically recognizes custom themes and languages added to bat. You will need to install bat in order to run the bat cache --build command.

The languages and color themes that ship with delta are those that ship with bat. So, to propose a new language or color theme for inclusion in delta, it would need to be a helpful addition to bat, in which case please open a PR against bat.