forked from kashifshah-mirrors/goptimize
118 lines
3.0 KiB
Go
118 lines
3.0 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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)
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var (
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quality int
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maxWidth int
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maxHeight int
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outputDir string
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skipPreserveModTimes bool
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jpegoptim string
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jpegtran string
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optipng string
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pngquant string
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gifsicle string
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)
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func main() {
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// set the default help
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flag.Usage = func() {
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fmt.Println("Goptimize - Resample optimized images")
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fmt.Printf("\nUsage: %s [options] <images>\n", os.Args[0])
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fmt.Println("\nOptions:")
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flag.PrintDefaults()
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fmt.Println("\nExamples:")
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fmt.Printf(" %s -m 800x800 *.jpg\n", os.Args[0])
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fmt.Printf(" %s -o out/ -q 90 -m 1600x1600 *.jpg\n", os.Args[0])
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fmt.Println("\nDetected optimizers:")
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if err := displayDelectedOptimizer("jpegtran ", jpegtran); err != nil {
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displayDelectedOptimizer("jpegoptim", jpegoptim)
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}
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displayDelectedOptimizer("optipng ", optipng)
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displayDelectedOptimizer("pngquant ", pngquant)
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displayDelectedOptimizer("gifsicle ", gifsicle)
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}
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var maxSizes string
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flag.IntVar(&quality, "q", 75, "Quality - JPEG only")
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flag.StringVar(&outputDir, "o", "", "Output directory (default overwrites original)")
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flag.BoolVar(&skipPreserveModTimes, "n", false, "Do not preserve file modification times")
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flag.StringVar(&maxSizes, "m", "", "Scale down to a maximum width & height. Format must be <width>x<height>.")
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// third-party optimizers
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flag.StringVar(&gifsicle, "gifsicle", "gifsicle", "gifsicle binary")
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flag.StringVar(&jpegoptim, "jpegoptim", "jpegoptim", "jpegoptim binary")
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flag.StringVar(&jpegtran, "jpegtran", "jpegtran", "jpegtran binary")
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flag.StringVar(&optipng, "optipng", "optipng", "optipng binary")
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flag.StringVar(&pngquant, "pngquant", "pngquant", "pngquant binary")
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// parse flags
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flag.Parse()
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// detect optimizer paths
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gifsicle, _ = exec.LookPath(gifsicle)
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jpegoptim, _ = exec.LookPath(jpegoptim)
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jpegtran, _ = exec.LookPath(jpegtran)
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optipng, _ = exec.LookPath(optipng)
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pngquant, _ = exec.LookPath(pngquant)
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if len(flag.Args()) < 1 {
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flag.Usage()
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return
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}
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if maxSizes != "" {
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// calculate max sizes from arg[0]
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r := regexp.MustCompile(`^(\d+)(x|X|\*|:)(\d+)$`)
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matches := r.FindStringSubmatch(maxSizes)
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if len(matches) != 4 {
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flag.Usage()
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return
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}
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maxWidth, _ = strconv.Atoi(matches[1])
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maxHeight, _ = strconv.Atoi(matches[3])
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}
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// parse arguments
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args := flag.Args()
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if outputDir != "" {
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// ensure the output directory exists
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if _, err := os.Stat(outputDir); os.IsNotExist(err) {
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err := os.MkdirAll(outputDir, os.ModePerm)
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if err != nil {
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fmt.Printf("Cannot create output directory: %s\n", outputDir)
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return
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}
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}
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}
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for _, img := range args {
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Goptimize(img)
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}
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}
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// displayDelectedOptimizer prints whether the optimizer was found
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func displayDelectedOptimizer(name, bin string) error {
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exe, err := exec.LookPath(bin)
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if err != nil {
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// fmt.Printf(" - %s: [undetected]\n", name)
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return err
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}
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fmt.Printf(" - %s: %s\n", name, exe)
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return nil
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}
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