File Hash Cache

Simple SHA-1 hash cache for tracking file changes. Cache is saved to disk.

Usage

Init the cache.

Optional arguments:

• defaultKey = 'file'; used throughout to categorize groups of files
• cacheFile = '.hash-cache.json'; filename of the cache on disk
• cacheRoot = process.cwd(); root where to place the cache on disk
• projectRoot = process.cwd(); root from where relative file paths are calculated

import FileHashCache from '@eklingen/file-hash-cache'
const fileHashCache = new FileHashCache()

Update a file entry in the cache (existing cache will automatically be loaded from disk):

fileHashCache.updateEntry(filename = 'readme.md', key = 'readme-files', encoding = 'utf-8')

And finally, save the cache to disk:

fileHashCache.save()

Other available methods

To force load the cache: This loads the full cache. Pass a key to initialize the group if it doesn't exist yet in the cache.

fileHashCache.load('readme-files')

To check if a file hash has changed as compared to the value in the cache: This always compares file contents since the output can differ after writing it to a file.

const hasChanged = fileHashCache.fileHasChanged(file = 'readme.md', key = 'readme-files', encoding = 'utf-8')

To compare the hash of two files, regardless of the cache: This always compares file contents since the output can differ after writing it to a file.

const isIdentical = fileHashCache.compareFiles(firstFilepath = 'somewhere/readme.md', secondFilepath = 'else/readme.md', encoding = 'utf-8')

Dependencies

None.

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Copyright (c) 2024 Elco Klingen. MIT License.