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import Dirent from "./_fs_dirent.ts";
export default class Dir {
private dirPath: string | Uint8Array;
private files: Dirent[] = [];
private filesReadComplete = false;
constructor(path: string | Uint8Array) {
this.dirPath = path;
}
get path(): string {
if (this.dirPath instanceof Uint8Array) {
return new TextDecoder().decode(this.dirPath);
}
return this.dirPath;
}
/**
* NOTE: Deno doesn't provide an interface to the filesystem like readdir
* where each call to readdir returns the next file. This function simulates this
* behaviour by fetching all the entries on the first call, putting them on a stack
* and then popping them off the stack one at a time.
*
* TODO: Rework this implementation once https://github.com/denoland/deno/issues/4218
* is resolved.
*/
read(callback?: Function): Promise<Dirent | null> {
return new Promise(async (resolve, reject) => {
try {
if (this.initializationOfDirectoryFilesIsRequired()) {
const denoFiles: Deno.FileInfo[] = await Deno.readdir(this.path);
this.files = denoFiles.map(file => new Dirent(file));
}
const nextFile = this.files.pop();
if (nextFile) {
resolve(nextFile);
this.filesReadComplete = this.files.length === 0;
} else {
this.filesReadComplete = true;
resolve(null);
}
if (callback) {
callback(null, !nextFile ? null : nextFile);
}
} catch (err) {
if (callback) {
callback(err, null);
}
reject(err);
}
});
}
readSync(): Dirent | null {
if (this.initializationOfDirectoryFilesIsRequired()) {
this.files.push(
...Deno.readdirSync(this.path).map(file => new Dirent(file))
);
}
const dirent: Dirent | undefined = this.files.pop();
this.filesReadComplete = this.files.length === 0;
return !dirent ? null : dirent;
}
private initializationOfDirectoryFilesIsRequired(): boolean {
return this.files.length === 0 && !this.filesReadComplete;
}
/**
* Unlike Node, Deno does not require managing resource ids for reading
* directories, and therefore does not need to close directories when
* finished reading.
*/
close(callback?: Function): Promise<void> {
return new Promise((resolve, reject) => {
try {
if (callback) {
callback(null);
}
resolve();
} catch (err) {
if (callback) {
callback(err);
}
reject(err);
}
});
}
/**
* Unlike Node, Deno does not require managing resource ids for reading
* directories, and therefore does not need to close directories when
* finished reading
*/
closeSync(): void {
//No op
}
async *[Symbol.asyncIterator](): AsyncIterableIterator<Dirent> {
try {
while (true) {
const dirent: Dirent | null = await this.read();
if (dirent === null) {
break;
}
yield dirent;
}
} finally {
await this.close();
}
}
}
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