deno-files-example.ts

const config = {
  typeDirs: [
    { type: "pdf", directory: "documents" },
    { type: "png", directory: "images" },
    { type: "mp3", directory: "music" },
  ],
};

type Config = typeof config;
type TypeDirs = Config["typeDirs"];

const DIRECTORY_NAME = Deno.args[0];

if (DIRECTORY_NAME) {
  createCategoriesDirectories(config.typeDirs, DIRECTORY_NAME);
  moveFiles(DIRECTORY_NAME);
} else {
  console.log("Specify target directory");
}

function createCategoriesDirectories(
  typeDirs: TypeDirs,
  directoryName: string
) {
  [...typeDirs, { directory: "other" }].map((d) => {
    const dirname = `${directoryName}/${d.directory}`;
    Deno.mkdirSync(dirname);
  });
}

async function moveFiles(directoryName: string) {
  for await (const file of Deno.readDir(directoryName)) {
    const extname = file.name.split(".")[1]
    if (extname) {
      const { directory: targetDir = "other" } =
        config.typeDirs.find((dir) => dir.type == extname) || {};
    
      const oldPath = `${Deno.cwd()}/${directoryName}/${file.name}`;
      const newPath = `${Deno.cwd()}/${directoryName}/${targetDir}/${file.name}`;

      Deno.renameSync(oldPath, newPath);
    }
  }
}