gallery exposes a local gallery as a web gallery. It uses lightbox2(http://lokeshdhakar.com/projects/lightbox2/) to present images.

All images (*.jpg, *.jpeg, *.png, *.gif) in the folder are scaned recursively and indexed. Images are indexed by SHA-1 of [absolute path of the image file] and [modification time of the image file]. gallery watches the image folder and re-indexes when the modification time of the folder changes

There are three sizes for each image: Thumbnail (width = 240px), Large (width = 1024), and Original. Thumbnail and Large are cached in groupcache(https://github.com/golang/groupcache) while Original is always loaded from hard drive. 32 MB and 128 MB are allocated for Thumbnails and Larges respectively.

go get -u github.com/songgao/gallery

Usage of gallery:
  -image="": path to the folder that has images (supported formats: .jpg, .png, .gif)
  -laddr="localhost:7428": http listening address

gallery -image=/path/to/image/folder -laddr=localhost:7428