update image scale

image-scale/main.ts

@@ -1,6 +1,7 @@
+#!/usr/bin/env -S deno run -A
+
 import sharp from "sharp";
 import {parseArgs} from "@std/cli/parse-args";
-import { basename, extname, join } from "@std/path";
 
 /**
  * Resize an image so that its smallest dimension equals the specified minimum pixels.
@@ -14,6 +15,7 @@ export async function scaleImage(
   inputPath: string,
   outputPath: string,
   minPixels: number,
+  quality?: number,
 ): Promise<void> {
   if (minPixels <= 0) {
     throw new Error("minPixels must be a positive number");
@@ -27,6 +29,13 @@ export async function scaleImage(
     throw new Error("Could not determine image dimensions");
   }
 
+  if (originalWidth < minPixels || originalHeight < minPixels) {
+    // original width or height is less than min pixels, should not scale image
+    throw new Error(
+      `Image width ${originalWidth} and/or height ${originalHeight} less then ${minPixels}, cannot scale image`,
+    );
+  }
+
   // Calculate the scale factor based on the smaller dimension
   const minDimension = Math.min(originalWidth, originalHeight);
   const scaleFactor = minPixels / minDimension;
@@ -36,7 +45,7 @@ export async function scaleImage(
 
   await sharp(inputPath)
     .resize(newWidth, newHeight)
-    .jpeg({ quality: 90 })
+    .jpeg({ quality: quality ?? 90 })
     .toFile(outputPath);
 
   console.log(
@@ -48,10 +57,20 @@ export async function scaleImage(
  * Generate output path for the scaled image.
  * Changes the extension to .jpg
  */
-export function getOutputPath(inputPath: string, outputDir?: string): string {
-  const base = basename(inputPath, extname(inputPath));
-  const dir = outputDir || join(inputPath, "..");
-  return join(dir, `${base}.jpg`);
+export function getOutputPath(
+  inputPath: string,
+  unsafeReplaceFile: boolean,
+): string {
+  if (unsafeReplaceFile) {
+    const lowerInputPath = inputPath.toLowerCase();
+    if (lowerInputPath.endsWith(".jpg") || lowerInputPath.endsWith(".jpeg")) {
+      return inputPath;
+    }
+  }
+  const lastDot = inputPath.lastIndexOf(".");
+  return lastDot !== -1
+    ? `${inputPath.slice(0, lastDot)}${unsafeReplaceFile ? "" : "_scaled"}.jpg`
+    : `${inputPath}${unsafeReplaceFile ? "" : "_scaled"}.jpg`;
 }
 
 function printUsage() {
@@ -75,15 +94,17 @@ Examples:
 
 if (import.meta.main) {
   const flags = parseArgs(Deno.args, {
-    string: ["output", "o", "min-pixels", "m"],
-    boolean: ["help", "h"],
+    string: ["output", "o", "min-pixels", "m", "quality", "q"],
+    boolean: ["help", "h", "unsafe-replace-file"],
     alias: {
       "min-pixels": "m",
       output: "o",
       help: "h",
+      quality: "q",
     },
     default: {
       "min-pixels": "1200",
+      "quality": "90",
     },
   });
 
@@ -92,26 +113,30 @@ if (import.meta.main) {
     Deno.exit(0);
   }
 
-  const inputPath = flags._[0] as string | undefined;
+  const imagePaths = flags._;
 
-  if (!inputPath) {
-    console.error("Error: Input image path is required");
+  if (imagePaths.length == 0) {
+    console.error("No image paths found.");
     printUsage();
     Deno.exit(1);
   }
 
   const minPixels = parseInt(flags["min-pixels"] as string, 10);
-  const outputPath = flags.output
-    ? flags.output.endsWith(".jpg") || flags.output.endsWith(".jpeg")
-      ? flags.output as string
-      : getOutputPath(inputPath, flags.output as string)
-    : getOutputPath(inputPath);
+  const quality = parseInt(flags["quality"] as string, 10);
+  const unsafeReplaceFile = flags["unsafe-replace-file"];
+  console.log(
+    `Image scale config, min-pixels: ${minPixels}, quality: ${quality}, unsafe-replace-file: ${unsafeReplaceFile}`,
+  );
+
+  for (const imagePath of imagePaths) {
+    const imagePathStr = imagePath as string;
+    const outputPath = getOutputPath(imagePathStr, unsafeReplaceFile);
 
     try {
-    await scaleImage(inputPath, outputPath, minPixels);
+      await scaleImage(imagePathStr, outputPath, minPixels, quality);
       console.log(`Output saved to: ${outputPath}`);
     } catch (error) {
       console.error("Error:", error instanceof Error ? error.message : error);
-    Deno.exit(1);
+    }
   }
 }