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main.go
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/
main.go
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package main
import (
"fmt"
"log"
"os"
"github.com/disintegration/imaging"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
inFile = kingpin.Arg("in", "Input PNG.").Required().String()
outFile = kingpin.Flag("out", "Output PNG.").Required().Short('o').String()
vertical = kingpin.Flag("vertical", "Vertical flip.").Short('v').Bool()
horizontal = kingpin.Flag("horizontal", "Horizontal flip.").Short('h').Bool()
)
func main() {
kingpin.Parse()
if !*vertical && !*horizontal {
fmt.Println("error: either --horizontal or --vertical is required")
os.Exit(1)
}
img, err := imaging.Open(*inFile)
if err != nil {
log.Fatal(err)
}
if *horizontal {
img = imaging.FlipH(img)
}
if *vertical {
img = imaging.FlipV(img)
}
if err := imaging.Save(img, *outFile); err != nil {
log.Fatal(err)
}
}