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152 lines
5.6 KiB
152 lines
5.6 KiB
/* ——————————————————————————————————————————————————————————————————————————
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Proyecto ImgResizer
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—————————————————————————————————————————————————————————————————————————————
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Fichero main.go
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Package ImgResizer
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Autor Juan V. Navarro juanvnl@activething.com
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Creado 26/01/2026
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—————————————————————————————————————————————————————————————————————————————
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LICENSES AND TERMS OF USE
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-------------------------
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This software is licensed under the Elastic License v2.0 (the "License").
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For full terms and additional information regarding permitted and prohibited
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uses, please visit:
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https://activething.com/ATGO/licenses
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You may use, copy, modify, and redistribute this software internally within
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your organization for any purpose, including research, development, and
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testing, subject to the terms of this License.
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You may NOT, however, use, provide, distribute, or make this software
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available to any third party as part of a hosted service, SaaS offering, or
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commercial product without first obtaining a commercial license from
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Active Thing.
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You may combine this software with other code, provided that such
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combination does not circumvent the restrictions of this License.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. In no event shall
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the authors or copyright holders be liable for any claim, damages, or other
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liability arising from the use of this software.
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—————————————————————————————————————————————————————————————————————————————
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Web : activething.com | activething.com/ImgResizer
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git : g.activething.com | github.com/activething/ImgResizer
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Correo : dev@activething.com
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—————————————————————————————————————————————————————————————————————————————
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No deseo caminar sobre el agua", dijo Siddhartha.
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Que los antiguos chamanes se contenten con tales habilidades.
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—— Hermann Hesse, Siddhartha
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—————————————————————————————————————————————————————————————————————————————
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Copyright (c) 2026 Active Thing
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————————————————————————————————————————————————————————————————————————————— */
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package main
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import (
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"flag"
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"fmt"
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"image"
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"image/jpeg"
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"image/png"
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"log"
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"os"
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"path/filepath"
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"strings"
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"github.com/disintegration/imaging"
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// Decodificador Pure Go para WebP (No requiere CGO)
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_ "golang.org/x/image/webp"
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)
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func main() {
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inputDir := flag.String("dir", "", "Directorio de origen")
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outputDir := flag.String("out", "", "Directorio de destino")
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width := flag.Int("width", 0, "Ancho (excluyente)")
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height := flag.Int("height", 0, "Alto (excluyente)")
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quality := flag.Int("calidad", 100, "Calidad (1-100)")
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configurarAyuda()
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flag.Parse()
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if *inputDir == "" || *outputDir == "" || (*width == 0 && *height == 0) {
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flag.Usage()
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return
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}
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if *width > 0 && *height > 0 {
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log.Fatal("Error: -width y -height son excluyentes.")
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}
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os.MkdirAll(*outputDir, 0755)
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files, _ := os.ReadDir(*inputDir)
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for _, file := range files {
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ext := strings.ToLower(filepath.Ext(file.Name()))
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if ext != ".jpg" && ext != ".jpeg" && ext != ".png" && ext != ".webp" {
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continue
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}
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fmt.Printf("Procesando %s... ", file.Name())
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err := processImage(filepath.Join(*inputDir, file.Name()), filepath.Join(*outputDir, file.Name()), *width, *height, *quality)
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if err != nil {
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fmt.Printf("ERROR: %v\n", err)
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} else {
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fmt.Println("OK")
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}
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}
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}
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func processImage(src, dst string, w, h, q int) error {
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// 1. Abrir imagen (Soporta WebP, JPG, PNG gracias a los imports con _)
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f, err := os.Open(src)
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if err != nil {
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return err
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}
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defer f.Close()
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img, _, err := image.Decode(f)
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if err != nil {
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return err
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}
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// 2. Redimensionar
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resized := imaging.Resize(img, w, h, imaging.Lanczos)
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// 3. Guardar según extensión
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out, err := os.Create(dst)
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if err != nil {
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return err
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}
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defer out.Close()
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ext := strings.ToLower(filepath.Ext(dst))
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switch ext {
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case ".jpg", ".jpeg":
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return jpeg.Encode(out, resized, &jpeg.Options{Quality: q})
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case ".png":
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// El encoder estándar de Go es muy robusto
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return png.Encode(out, resized)
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case ".webp":
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// Si llegas aquí sin CGO, el programa dirá que no sabe codificar WebP
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// pero al menos el resto del programa COMPILARÁ y FUNCIONARÁ
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return fmt.Errorf("la escritura de WebP requiere CGO y un compilador de C (GCC)")
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default:
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return imaging.Save(resized, dst)
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}
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}
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func configurarAyuda() {
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flag.Usage = func() {
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fmt.Printf("\nUso: resizer -dir <origen> -out <destino> [-width | -height]\n")
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flag.PrintDefaults()
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}
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}
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