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files.go
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files.go
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package files
import (
"image"
_ "image/jpeg"
_ "image/png"
"log"
"io"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/gobuffalo/packr"
"github.com/gotk3/gotk3/gdk"
"github.com/rwcarlsen/goexif/exif"
"github.com/rwcarlsen/goexif/mknote"
)
type File struct {
Info os.FileInfo
Path string
}
func ListFiles(folderPath string) ([]File, error) {
files := []File{}
err := filepath.Walk(folderPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
// don't add directory information
if info.IsDir() {
return nil
}
if !isValidExtension(path) {
return nil
}
files = append(files, File{
Info: info,
Path: path,
})
return nil
})
return files, err
}
func isValidExtension(path string) bool {
extension := strings.ToLower(filepath.Ext(path))
if extension == ".png" ||
extension == ".jpg" ||
extension == ".jpeg" {
return true
}
return false
}
func LoadFile(path string, box *packr.Box) (http.File, error) {
var file http.File
var err error
if box == nil {
file, err = os.Open(path)
} else {
file, err = box.Open(path)
}
if err != nil {
return nil, err
}
return file, nil
}
func LoadImage(path string, box *packr.Box) (image.Image, error) {
var file http.File
var err error
if box == nil {
file, err = os.Open(path)
} else {
file, err = box.Open(path)
}
if err != nil {
return nil, err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
return img, nil
}
func PixbufFromFile(path string, box *packr.Box) (*gdk.Pixbuf, error) {
// Create loader
loader, err := gdk.PixbufLoaderNew()
if err != nil {
return nil, err
}
defer loader.Close()
// Load file
file, err := LoadFile(path, box)
if err != nil {
return nil, err
}
defer file.Close()
// Copy from file to loader
_, err = io.Copy(loader, file)
if err != nil {
return nil, err
}
// Close loader
err = loader.Close()
if err != nil {
return nil, err
}
// Get pixbuf from loader
pixbuf, err := loader.GetPixbuf()
if err != nil {
return nil, err
}
return pixbuf, nil
}
func ExifDataFromFile(path string) *exif.Exif {
f, err := os.Open(path)
if err != nil {
log.Fatal(err)
}
// Optionally register camera makenote data parsing - currently Nikon and
// Canon are supported.
exif.RegisterParsers(mknote.All...)
x, err := exif.Decode(f)
if err != nil {
x = nil
}
return x
}