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compiler-explorer/docs/AddingAFormatter.md
Matt Godbolt 54e2dae21f Add comprehensive Configuration.md documentation (#7626) 
This PR adds a detailed Configuration.md document that comprehensively
explains the Compiler Explorer configuration system. It covers:

- Configuration file structure and hierarchical loading
- Property types and automatic conversions
- List separators and specialized formats
- Group inheritance and compiler configuration
- Variable substitution mechanisms
- Advanced features like remote compilers and property debugging

Additionally, it updates all related documentation to reference this
central document for configuration details, reducing duplication and
ensuring consistency.

This document will serve as the foundation for future configuration
system improvements by providing clear documentation of the current
implementation.
2025-04-26 18:12:58 -05:00

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Adding a new formatter

  • Add a etc/config/compiler-explorer.local.properties file (for details on the configuration system, see Configuration.md)

    • Add a new formatter under the formatters key

    • The new formatter can have the following keys: name, exe, styles, type, explicitVersion (to override version parsing), version (argument to get version info), versionRe (regex to filter out the right version info)

    • Add a lib/formatters/<formatter>.ts file using the template below, replacing Type and type as appropriate

      import {UnprocessedExecResult} from '../../types/execution/execution.interfaces';
import {BaseFormatter} from './base';
import {FormatOptions} from './base.interfaces';

export class TypeFormatter extends BaseFormatter {
  static get key() {
    return 'type';
  }
}

    • The value returned by key above corresponds to the type property you set in the compiler-explorer properties configuration file.

    • Tweak format(source: string, options: FormatOptions): Promise<UnprocessedExecResult> and isValidStyle(style: string): boolean as necessary. See the JSDoc for format and the implementations for other formatters to get a further understanding of how to implement format(source, options).

  • Add your TypeFormatter to lib/formatters/_all.ts in alphabetical order

  • You can check the output of http://localhost:10240/api/formats to be sure your formatter is there.

  • Make an installer in the infra repository. An example patch for adding an installer can be found here