goptimize/main.go

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package main
import (
"fmt"
"os"
"os/exec"
"regexp"
"strconv"
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"github.com/axllent/gitrel"
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"github.com/spf13/pflag"
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)
var (
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quality int
maxWidth int
maxHeight int
outputDir string
preserveModTimes bool
jpegoptim string
jpegtran string
optipng string
pngquant string
gifsicle string
version = "dev"
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)
func main() {
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// set up new flag instance
flag := pflag.NewFlagSet(os.Args[0], pflag.ExitOnError)
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// set the default help
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flag.Usage = func() {
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fmt.Println("Goptimize - downscales and optimizes images")
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fmt.Printf("\nUsage: %s [options] <images>\n", os.Args[0])
fmt.Println("\nOptions:")
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flag.SortFlags = false
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flag.PrintDefaults()
fmt.Println("\nExamples:")
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fmt.Printf(" %s image.png\n", os.Args[0])
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fmt.Printf(" %s -m 800x800 *.jpg\n", os.Args[0])
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 {
displayDelectedOptimizer("jpegoptim", jpegoptim)
}
displayDelectedOptimizer("optipng ", optipng)
displayDelectedOptimizer("pngquant ", pngquant)
displayDelectedOptimizer("gifsicle ", gifsicle)
}
var maxSizes string
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var update, showversion, showhelp bool
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flag.IntVarP(&quality, "quality", "q", 75, "quality, JPEG only")
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flag.StringVarP(&maxSizes, "max", "m", "", "downscale to a maximum width & height in pixels (<width>x<height>)")
flag.StringVarP(&outputDir, "out", "o", "", "output directory (default overwrites original)")
flag.BoolVarP(&preserveModTimes, "preserve", "p", true, "preserve file modification times")
flag.BoolVarP(&update, "update", "u", false, "update to latest release")
flag.BoolVarP(&showversion, "version", "v", false, "show version number")
flag.BoolVarP(&showhelp, "help", "h", false, "show help")
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// third-party optimizers
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flag.StringVar(&jpegtran, "jpegtran", "jpegtran", "jpegtran binary")
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flag.StringVar(&jpegoptim, "jpegoptim", "jpegoptim", "jpegoptim binary")
flag.StringVar(&gifsicle, "gifsicle", "gifsicle", "gifsicle binary")
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flag.StringVar(&pngquant, "pngquant", "pngquant", "pngquant binary")
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flag.StringVar(&optipng, "optipng", "optipng", "optipng binary")
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flag.SortFlags = false
// parse args excluding os.Args[0]
flag.Parse(os.Args[1:])
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// detect optimizer paths
gifsicle, _ = exec.LookPath(gifsicle)
jpegoptim, _ = exec.LookPath(jpegoptim)
jpegtran, _ = exec.LookPath(jpegtran)
optipng, _ = exec.LookPath(optipng)
pngquant, _ = exec.LookPath(pngquant)
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if showhelp {
flag.Usage()
os.Exit(1)
}
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if showversion {
fmt.Println(fmt.Sprintf("Version: %s", version))
latest, _, _, err := gitrel.Latest("axllent/goptimize", "goptimize")
if err == nil && latest != version {
fmt.Printf("Update available: %s\nRun `%s -u` to update.\n", latest, os.Args[0])
}
return
}
if update {
rel, err := gitrel.Update("axllent/goptimize", "goptimize", version)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
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fmt.Printf("Updated %s to version %s\n", os.Args[0], rel)
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return
}
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if len(flag.Args()) < 1 {
flag.Usage()
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os.Exit(1)
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}
if maxSizes != "" {
// calculate max sizes from arg[0]
r := regexp.MustCompile(`^(\d+)(x|X|\*|:)(\d+)$`)
matches := r.FindStringSubmatch(maxSizes)
if len(matches) != 4 {
flag.Usage()
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os.Exit(1)
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}
maxWidth, _ = strconv.Atoi(matches[1])
maxHeight, _ = strconv.Atoi(matches[3])
}
// parse arguments
args := flag.Args()
if outputDir != "" {
// ensure the output directory exists
if _, err := os.Stat(outputDir); os.IsNotExist(err) {
err := os.MkdirAll(outputDir, os.ModePerm)
if err != nil {
fmt.Printf("Cannot create output directory: %s\n", outputDir)
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os.Exit(1)
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}
}
}
for _, img := range args {
Goptimize(img)
}
}
// displayDelectedOptimizer prints whether the optimizer was found
func displayDelectedOptimizer(name, bin string) error {
exe, err := exec.LookPath(bin)
if err != nil {
return err
}
fmt.Printf(" - %s: %s\n", name, exe)
return nil
}