Overview

NodeJS utility for recursive directory iteration and comparison.

Installation

npm i @aminzer/dir-diff

Usage examples

Directory iteration

const { iterateDirectoryChildren } = require('@aminzer/dir-diff');

await iterateDirectoryChildren('d:/work', (fsEntry) => {
  console.log(`${fsEntry.isFile ? 'File' : 'Directory'} ${fsEntry.relativePath} was found`);
});

Directory comparison

const { compareDirectories } = require('@aminzer/dir-diff');

await compareDirectories('d:/work', 'e:/backups/work', {
  onSourceOnlyEntry: (fsEntry) => {
   console.log(`${fsEntry.isFile ? 'File' : 'Directory'} ${fsEntry.relativePath} exists in the source directory only`);
  },
  onTargetOnlyEntry: (fsEntry) => {
   console.log(`${fsEntry.isFile ? 'File' : 'Directory'} ${fsEntry.relativePath} exists in the target directory only`);
  },
  onDifferentEntries: (sourceFsEntry, targetFsEntry) => {
   console.log(`File ${sourceFsEntry.relativePath} exists in both source and target directories, but with different content`);
  },
});

API

iterateDirectoryChildren

Overview

iterateDirectoryChildren is used for recursive iteration of directory children.

iterateDirectoryChildren(dirPath, onEachChild);

Parameters

• dirPath (string, required) - path to the directory which children should be iterated.
• onEachChild (function, required) - callback that is called for each child file and directory.

onEachChild callback accepts following arguments:

• fsEntry (FsEntry) - currently iterated child file or directory.
• additionalArgs (object, optional) - additional callback arguments:
  • skipEntryChildrenIteration (function) - if this function is called within onEachChild function then iteration of entry children will be skipped.

Return value

Promise that becomes fulfilled when directory children iteration is completed.

compareDirectories

Overview

compareDirectories is used for recursive comparison of 2 directories.

compareDirectories(sourceDirPath, targetDirPath, opts)

Parameters

• sourceDirPath (string, required) - path to the source directory.
• targetDirPath (string, required) - path to the target directory.
• opts (object, optional) - additional options to pass:
  • onSourceOnlyEntry (function, null by default) - function that is called for files and directories that are present in source directory, but are missing in target directory. Corresponding FsEntry instance is passed as parameter.
  • onTargetOnlyEntry (function, null by default) - function that is called for files and directories that are missing in source directory, but are present in target directory. Corresponding FsEntry instance is passed as parameter.
  • onDifferentEntries (function, null by default) - function that is called for files that are present in both source and target directories but have different content. Corresponding FsEntry instances are passed as parameters.
  • onEachEntry (function, null by default) - function that is called for all files and directories from both source and target directories. Corresponding FsEntry instance is passed as parameter.
  • skipContentComparison (boolean, false by default) - files are compared by size only. Content comparison is skipped. It speeds up execution by avoiding "expensive" content-comparison process for large files.
  • skipExcessNestedIterations (boolean, false by default) - children of source-only and target-only directories are not considered. It speeds up execution by avoiding recursive calls for such directories.

Return value

Promise that becomes fulfilled when directory comparison is completed.

FsEntry

Overview

FsEntry - class representing File System Entry (file or directory).

const { FsEntry } =  require('@aminzer/dir-diff');

Instance properties:

• name (string) - name of entry.
• absolutePath (string) - absolute path to entry.
• relativePath (string) - relative path to entry. It's relative to source directory for source entries and relative to target directory for target entries.
• size (number) - size of file in bytes, 0 for directories.
• isFile (boolean) - true if entry is file.
• isDirectory (boolean) - true if entry is directory.

Command line tool

@aminzer/dir-diff-cli