Add support for conversion from any format

[piotrstenke]

#87

[p2r3]

How did you test this?

[piotrstenke]

How did you test this?

I'm making a ZIP converter mentioned in #95, so I've tested with that, but a simple example would like this:

anyHandler.ts

import type { FileData, FileFormat, FormatHandler } from "../FormatHandler.ts";

class anyHandler implements FormatHandler {
  public name: string = "any";

  public supportedFormats: FileFormat[] = [
    {
      name: "ZIP Archive",
      format: "zip",
      extension: "zip",
      mime: "application/zip",
      from: false,
      to: true,
      internal: "zip"
    }
  ];

  public supportAnyInput: boolean = true;

  public ready: boolean = false;

  async init() {
    this.ready = true;
  }

  async doConvert(
    inputFiles: FileData[],
    inputFormat: FileFormat,
    outputFormat: FileFormat
  ): Promise<FileData[]> {
    return [{ name: "test.zip", bytes: new Uint8Array([0, 1]) }];
  }
}

export default anyHandler;

index.ts

try { handlers.push(new anyHandler()); } catch (_) { };

If you try to convert to ZIP from format listed in 'renameHandler' (e.g. xlsx), the 'renameHandler' will be used as usual. If you try with e.g. a png file, no direct path is found, so it fallbacks to this 'anyHandler'.

To test this you must temporarily comment out line 148 in rename.ts, as right now it throws an error for non-zip files.

if (inputFormat.internal !== "zip") throw "Invalid input format.";