jpg2go

README

jpg2go

A very easy tool for resizing jpg files.

Program logic

Target of this small project should be to practice the decoupling William Kennedy is talking about in his great talk.

Therefore all the logic for resizing a list of pictures is moved into several interfaces.

• FilePahtsGetter: Gets the filepaths, when a root is given
• Imager: Returns an image.Image, when a filepath is given
• Resizer: Resizes the image
• Writer: Writes the image to a destination

All interfaces are bundled into the type FilesComponents.

The resize package just uses that interface to resize all the given files.

The file cmd/cli/main.go brings all the impementations and the resize package together.

• osfiles - FilePathsGetter
• jpg - Imager and Writer
• nfntresizer - Resizer

Documentation

Index

• type FilePathsGetter
• type FilesComponents
• type Imager
• type Resizer
• type Size
• type Writer

Types

type FilePathsGetter

type FilePathsGetter interface {
	Get(root string) []string
}

FilePathsGetter takes a filepath and returns filenpaths in a slice

type FilesComponents

type FilesComponents struct {
	FilePathsGetter
	Imager
	Resizer
	Writer
}

FilesComponents are all the interfaces wich are needed for resizing files

type Imager

type Imager interface {
	Image(filePath string) (image.Image, error)
}

Imager takes a filePath and returns an Image

type Resizer

type Resizer interface {
	Resize(img image.Image, s Size) (image.Image, error)
}

Resizer reads resizes and writes an image.

type Size

type Size struct {
	Width  int
	Height int
}

Size describes the size of an image in pixel

type Writer

type Writer interface {
	Write(img image.Image, srcPath string) error
}

Writer takes an Image and the srcPath and writes